blob: 5a5eb59e6220c58585efe492c59faec9043824d5 [file] [log] [blame]
/*
* Copyright 2015 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "glimp/gles/context.h"
#include <algorithm>
#include <string>
#include "glimp/egl/error.h"
#include "glimp/egl/surface.h"
#include "glimp/gles/blend_state.h"
#include "glimp/gles/cull_face_state.h"
#include "glimp/gles/draw_mode.h"
#include "glimp/gles/index_data_type.h"
#include "glimp/gles/pixel_format.h"
#include "glimp/tracing/tracing.h"
#include "nb/pointer_arithmetic.h"
#include "starboard/common/log.h"
#include "starboard/memory.h"
#include "starboard/once.h"
namespace glimp {
namespace gles {
namespace {
SbOnceControl s_tls_current_context_key_once_control = SB_ONCE_INITIALIZER;
SbThreadLocalKey s_tls_current_context_key = kSbThreadLocalKeyInvalid;
void InitializeThreadLocalKey() {
s_tls_current_context_key = SbThreadCreateLocalKey(NULL);
}
SbThreadLocalKey GetThreadLocalKey() {
SbOnce(&s_tls_current_context_key_once_control, &InitializeThreadLocalKey);
return s_tls_current_context_key;
}
} // namespace
Context::Context(nb::scoped_ptr<ContextImpl> context_impl,
Context* share_context)
: impl_(context_impl.Pass()),
current_thread_(kSbThreadInvalid),
has_been_current_(false),
active_texture_(GL_TEXTURE0),
enabled_textures_dirty_(true),
enabled_vertex_attribs_dirty_(true),
pack_alignment_(4),
unpack_alignment_(4),
unpack_row_length_(0),
error_(GL_NO_ERROR) {
SbAtomicNoBarrier_Store(&has_swapped_buffers_, 0);
if (share_context != NULL) {
resource_manager_ = share_context->resource_manager_;
} else {
resource_manager_ = new ResourceManager();
}
SetupExtensionsString();
texture_units_.reset(
new nb::scoped_refptr<Texture>[impl_->GetMaxFragmentTextureUnits()]);
}
Context* Context::GetTLSCurrentContext() {
return reinterpret_cast<Context*>(SbThreadGetLocalValue(GetThreadLocalKey()));
}
bool Context::SetTLSCurrentContext(Context* context,
egl::Surface* draw,
egl::Surface* read) {
SB_DCHECK(context);
SB_DCHECK(draw);
SB_DCHECK(read);
if (context->current_thread() != kSbThreadInvalid &&
context->current_thread() != SbThreadGetCurrent()) {
SB_DLOG(WARNING) << "Another thread holds current the context that is to "
"be made current on this thread.";
egl::SetError(EGL_BAD_ACCESS);
return false;
}
// If this thread currently has another context current, release that one
// before we continue.
Context* existing_context = GetTLSCurrentContext();
if (existing_context != context) {
if (existing_context) {
existing_context->ReleaseContext();
}
SbThreadSetLocalValue(GetThreadLocalKey(),
reinterpret_cast<void*>(context));
}
context->MakeCurrent(draw, read);
return true;
}
void Context::ReleaseTLSCurrentContext() {
Context* existing_context = GetTLSCurrentContext();
if (existing_context) {
existing_context->ReleaseContext();
SbThreadSetLocalValue(GetThreadLocalKey(), NULL);
}
}
GLenum Context::GetError() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
GLenum error = error_;
error_ = GL_NO_ERROR;
return error;
}
const GLubyte* Context::GetString(GLenum name) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
switch (name) {
case GL_EXTENSIONS:
return reinterpret_cast<const GLubyte*>(extensions_string_.c_str());
case GL_VERSION:
return reinterpret_cast<const GLubyte*>("OpenGL ES 2.0 (glimp)");
case GL_VENDOR:
return reinterpret_cast<const GLubyte*>("Google Inc.");
case GL_RENDERER:
return reinterpret_cast<const GLubyte*>("glimp");
case GL_SHADING_LANGUAGE_VERSION:
return reinterpret_cast<const GLubyte*>("OpenGL ES GLSL ES 1.00");
default: {
SetError(GL_INVALID_ENUM);
return NULL;
}
}
}
void Context::GetIntegerv(GLenum pname, GLint* params) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
switch (pname) {
case GL_MAX_TEXTURE_SIZE:
*params = impl_->GetMaxTextureSize();
break;
case GL_ACTIVE_TEXTURE:
*params = static_cast<GLint>(active_texture_);
break;
case GL_MAX_RENDERBUFFER_SIZE:
*params = impl_->GetMaxRenderbufferSize();
break;
case GL_NUM_COMPRESSED_TEXTURE_FORMATS:
// We don't currently support compressed textures.
*params = 0;
break;
case GL_MAX_VERTEX_ATTRIBS:
*params = impl_->GetMaxVertexAttribs();
break;
case GL_MAX_TEXTURE_IMAGE_UNITS:
*params = impl_->GetMaxFragmentTextureUnits();
break;
case GL_MAX_FRAGMENT_UNIFORM_VECTORS:
*params = impl_->GetMaxFragmentUniformVectors();
break;
case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
*params = impl_->GetMaxVertexTextureImageUnits();
break;
case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
*params = impl_->GetMaxCombinedTextureImageUnits();
break;
case GL_UNPACK_ALIGNMENT:
*params = unpack_alignment_;
break;
default: {
SB_NOTIMPLEMENTED();
SetError(GL_INVALID_ENUM);
}
}
}
void Context::GetShaderiv(GLuint shader, GLenum pname, GLint* params) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
nb::scoped_refptr<Shader> shader_object =
resource_manager_->GetShader(shader);
if (!shader_object) {
SetError(GL_INVALID_VALUE);
return;
}
GLenum result = shader_object->GetShaderiv(pname, params);
if (result != GL_NO_ERROR) {
SetError(result);
}
}
void Context::GetShaderInfoLog(GLuint shader,
GLsizei bufsize,
GLsizei* length,
GLchar* infolog) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (bufsize < 0) {
SetError(GL_INVALID_VALUE);
return;
}
nb::scoped_refptr<Shader> shader_object =
resource_manager_->GetShader(shader);
if (!shader_object) {
SetError(GL_INVALID_VALUE);
return;
}
shader_object->GetShaderInfoLog(bufsize, length, infolog);
}
void Context::GetProgramiv(GLuint program, GLenum pname, GLint* params) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
nb::scoped_refptr<Program> program_object =
resource_manager_->GetProgram(program);
if (!program_object) {
SetError(GL_INVALID_VALUE);
return;
}
GLenum result = program_object->GetProgramiv(pname, params);
if (result != GL_NO_ERROR) {
SetError(result);
}
}
void Context::GetProgramInfoLog(GLuint program,
GLsizei bufsize,
GLsizei* length,
GLchar* infolog) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (bufsize < 0) {
SetError(GL_INVALID_VALUE);
return;
}
nb::scoped_refptr<Program> program_object =
resource_manager_->GetProgram(program);
if (!program_object) {
SetError(GL_INVALID_VALUE);
return;
}
program_object->GetProgramInfoLog(bufsize, length, infolog);
}
void Context::PixelStorei(GLenum pname, GLint param) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
switch (pname) {
case GL_PACK_ALIGNMENT:
case GL_UNPACK_ALIGNMENT:
if (param != 1 && param != 4 && param != 8) {
SetError(GL_INVALID_VALUE);
return;
}
break;
default:
if (param < 0) {
SetError(GL_INVALID_VALUE);
return;
}
break;
}
switch (pname) {
case GL_PACK_ALIGNMENT:
pack_alignment_ = param;
break;
case GL_UNPACK_ALIGNMENT:
unpack_alignment_ = param;
break;
case GL_UNPACK_ROW_LENGTH:
unpack_row_length_ = param;
break;
case GL_PACK_ROW_LENGTH:
case GL_PACK_SKIP_ROWS:
case GL_PACK_SKIP_PIXELS:
case GL_UNPACK_IMAGE_HEIGHT:
case GL_UNPACK_SKIP_ROWS:
case GL_UNPACK_SKIP_PIXELS:
case GL_UNPACK_SKIP_IMAGES:
SB_NOTIMPLEMENTED();
default:
SetError(GL_INVALID_ENUM);
break;
}
}
void Context::Enable(GLenum cap) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
switch (cap) {
case GL_BLEND:
draw_state_.blend_state.enabled = true;
draw_state_dirty_flags_.blend_state_dirty = true;
break;
case GL_SCISSOR_TEST:
draw_state_.scissor.enabled = true;
draw_state_dirty_flags_.scissor_dirty = true;
break;
case GL_CULL_FACE:
draw_state_.cull_face_state.enabled = true;
draw_state_.cull_face_state.mode = CullFaceState::kBack;
draw_state_dirty_flags_.cull_face_dirty = true;
break;
case GL_DEPTH_TEST:
case GL_DITHER:
case GL_STENCIL_TEST:
case GL_POLYGON_OFFSET_FILL:
case GL_SAMPLE_ALPHA_TO_COVERAGE:
case GL_SAMPLE_COVERAGE:
SB_NOTIMPLEMENTED();
default:
SetError(GL_INVALID_ENUM);
}
}
void Context::Disable(GLenum cap) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
switch (cap) {
case GL_BLEND:
draw_state_.blend_state.enabled = false;
draw_state_dirty_flags_.blend_state_dirty = true;
break;
case GL_SCISSOR_TEST:
draw_state_.scissor.enabled = false;
draw_state_dirty_flags_.scissor_dirty = true;
break;
case GL_CULL_FACE:
draw_state_.cull_face_state.enabled = false;
draw_state_dirty_flags_.cull_face_dirty = true;
break;
case GL_DEPTH_TEST:
case GL_DITHER:
case GL_STENCIL_TEST:
case GL_POLYGON_OFFSET_FILL:
case GL_SAMPLE_ALPHA_TO_COVERAGE:
case GL_SAMPLE_COVERAGE:
// Since these are not implemented yet, it is not an error to do nothing
// when we ask for them to be disabled!
break;
default:
SetError(GL_INVALID_ENUM);
}
}
void Context::ColorMask(GLboolean red,
GLboolean green,
GLboolean blue,
GLboolean alpha) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
draw_state_.color_mask = gles::ColorMask(red, green, blue, alpha);
draw_state_dirty_flags_.color_mask_dirty = true;
}
void Context::DepthMask(GLboolean flag) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (flag == GL_TRUE) {
SB_NOTIMPLEMENTED() << "glimp currently does not support depth buffers.";
SetError(GL_INVALID_OPERATION);
}
}
void Context::Clear(GLbitfield mask) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
impl_->Clear(mask & GL_COLOR_BUFFER_BIT, mask & GL_DEPTH_BUFFER_BIT,
mask & GL_STENCIL_BUFFER_BIT, draw_state_,
&draw_state_dirty_flags_);
}
void Context::ClearColor(GLfloat red,
GLfloat green,
GLfloat blue,
GLfloat alpha) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
draw_state_.clear_color = gles::ClearColor(red, green, blue, alpha);
draw_state_dirty_flags_.clear_color_dirty = true;
}
namespace {
BlendState::Factor BlendStateFactorFromGLenum(GLenum blend_factor) {
switch (blend_factor) {
case GL_ZERO:
return BlendState::kFactorZero;
case GL_ONE:
return BlendState::kFactorOne;
case GL_SRC_COLOR:
return BlendState::kFactorSrcColor;
case GL_ONE_MINUS_SRC_COLOR:
return BlendState::kFactorOneMinusSrcColor;
case GL_DST_COLOR:
return BlendState::kFactorDstColor;
case GL_ONE_MINUS_DST_COLOR:
return BlendState::kFactorOneMinusDstColor;
case GL_SRC_ALPHA:
return BlendState::kFactorSrcAlpha;
case GL_ONE_MINUS_SRC_ALPHA:
return BlendState::kFactorOneMinusSrcAlpha;
case GL_DST_ALPHA:
return BlendState::kFactorDstAlpha;
case GL_ONE_MINUS_DST_ALPHA:
return BlendState::kFactorOneMinusDstAlpha;
case GL_CONSTANT_COLOR:
return BlendState::kFactorConstantColor;
case GL_ONE_MINUS_CONSTANT_COLOR:
return BlendState::kFactorOneMinusConstantColor;
case GL_CONSTANT_ALPHA:
return BlendState::kFactorConstantAlpha;
case GL_ONE_MINUS_CONSTANT_ALPHA:
return BlendState::kFactorOneMinusConstantAlpha;
case GL_SRC_ALPHA_SATURATE:
return BlendState::kFactorSrcAlphaSaturate;
default:
return BlendState::kFactorInvalid;
}
}
BlendState::Equation BlendStateEquationFromGLenum(GLenum equation) {
switch (equation) {
case GL_FUNC_ADD:
return BlendState::kEquationFuncAdd;
case GL_FUNC_SUBTRACT:
return BlendState::kEquationFuncSubtract;
case GL_FUNC_REVERSE_SUBTRACT:
return BlendState::kEquationFuncReverseSubtract;
default:
return BlendState::kEquationFuncInvalid;
}
}
} // namespace
void Context::BlendFunc(GLenum sfactor, GLenum dfactor) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
BlendState::Factor src_factor = BlendStateFactorFromGLenum(sfactor);
BlendState::Factor dst_factor = BlendStateFactorFromGLenum(dfactor);
if (src_factor == BlendState::kFactorInvalid ||
dst_factor == BlendState::kFactorInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
draw_state_.blend_state.src_factor = src_factor;
draw_state_.blend_state.dst_factor = dst_factor;
draw_state_dirty_flags_.blend_state_dirty = true;
}
void Context::BlendEquation(GLenum mode) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
BlendState::Equation equation = BlendStateEquationFromGLenum(mode);
if (equation == BlendState::kEquationFuncInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
draw_state_.blend_state.equation = equation;
draw_state_dirty_flags_.blend_state_dirty = true;
}
namespace {
CullFaceState::Mode CullFaceModeFromEnum(GLenum mode) {
switch (mode) {
case GL_FRONT:
return CullFaceState::kFront;
case GL_BACK:
return CullFaceState::kBack;
case GL_FRONT_AND_BACK:
return CullFaceState::kFrontAndBack;
default:
return CullFaceState::kModeInvalid;
}
}
} // namespace
void Context::CullFace(GLenum mode) {
CullFaceState::Mode cull_face_mode = CullFaceModeFromEnum(mode);
if (cull_face_mode == CullFaceState::kModeInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
draw_state_.cull_face_state.mode = cull_face_mode;
draw_state_dirty_flags_.cull_face_dirty = true;
}
GLuint Context::CreateProgram() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
nb::scoped_ptr<ProgramImpl> program_impl = impl_->CreateProgram();
SB_DCHECK(program_impl);
nb::scoped_refptr<Program> program(new Program(program_impl.Pass()));
return resource_manager_->RegisterProgram(program);
}
void Context::DeleteProgram(GLuint program) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
// As indicated by the specification for glDeleteProgram(),
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteProgram.xml
// values of 0 will be silently ignored.
if (program == 0) {
return;
}
nb::scoped_refptr<Program> program_object =
resource_manager_->DeregisterProgram(program);
if (!program_object) {
SetError(GL_INVALID_VALUE);
}
}
void Context::AttachShader(GLuint program, GLuint shader) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
nb::scoped_refptr<Program> program_object =
resource_manager_->GetProgram(program);
if (!program_object) {
SetError(GL_INVALID_VALUE);
return;
}
nb::scoped_refptr<Shader> shader_object =
resource_manager_->GetShader(shader);
if (!shader_object) {
SetError(GL_INVALID_VALUE);
return;
}
if (!program_object->AttachShader(shader_object)) {
// A shader of the given type was already attached.
SetError(GL_INVALID_OPERATION);
}
}
void Context::LinkProgram(GLuint program) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
nb::scoped_refptr<Program> program_object =
resource_manager_->GetProgram(program);
if (!program_object) {
SetError(GL_INVALID_VALUE);
return;
}
program_object->Link();
if (program_object.get() == draw_state_.used_program.get()) {
MarkUsedProgramDirty();
}
}
void Context::BindAttribLocation(GLuint program,
GLuint index,
const GLchar* name) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (index >= GL_MAX_VERTEX_ATTRIBS) {
SetError(GL_INVALID_VALUE);
return;
}
if (name[0] == 'g' && name[1] == 'l' && name[2] == '_') {
// |name| is not allowed to begin with the reserved prefix, "gl_".
SetError(GL_INVALID_OPERATION);
return;
}
nb::scoped_refptr<Program> program_object =
resource_manager_->GetProgram(program);
if (!program_object) {
SetError(GL_INVALID_VALUE);
return;
}
program_object->BindAttribLocation(index, name);
if (program_object.get() == draw_state_.used_program.get()) {
draw_state_dirty_flags_.vertex_attributes_dirty = true;
}
}
void Context::UseProgram(GLuint program) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (program == 0) {
draw_state_.used_program = NULL;
MarkUsedProgramDirty();
return;
}
nb::scoped_refptr<Program> program_object =
resource_manager_->GetProgram(program);
if (!program_object) {
SetError(GL_INVALID_VALUE);
return;
}
if (!program_object->linked()) {
// Only linked programs can be used.
SetError(GL_INVALID_OPERATION);
return;
}
if (program_object.get() != draw_state_.used_program.get()) {
draw_state_.used_program = program_object;
MarkUsedProgramDirty();
}
}
GLuint Context::CreateShader(GLenum type) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
nb::scoped_ptr<ShaderImpl> shader_impl;
if (type == GL_VERTEX_SHADER) {
shader_impl = impl_->CreateVertexShader();
} else if (type == GL_FRAGMENT_SHADER) {
shader_impl = impl_->CreateFragmentShader();
} else {
SetError(GL_INVALID_ENUM);
return 0;
}
SB_DCHECK(shader_impl);
nb::scoped_refptr<Shader> shader(new Shader(shader_impl.Pass(), type));
return resource_manager_->RegisterShader(shader);
}
void Context::DeleteShader(GLuint shader) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
// As indicated by the specification for glDeleteShader(),
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteShader.xml
// values of 0 will be silently ignored.
if (shader == 0) {
return;
}
nb::scoped_refptr<Shader> shader_object =
resource_manager_->DeregisterShader(shader);
if (!shader_object) {
SetError(GL_INVALID_VALUE);
}
}
void Context::ShaderSource(GLuint shader,
GLsizei count,
const GLchar* const* string,
const GLint* length) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (count < 0) {
SetError(GL_INVALID_VALUE);
return;
}
nb::scoped_refptr<Shader> shader_object =
resource_manager_->GetShader(shader);
if (!shader_object) {
SetError(GL_INVALID_VALUE);
return;
}
shader_object->ShaderSource(count, string, length);
}
void Context::CompileShader(GLuint shader) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
nb::scoped_refptr<Shader> shader_object =
resource_manager_->GetShader(shader);
if (!shader_object) {
SetError(GL_INVALID_VALUE);
return;
}
shader_object->CompileShader();
}
void Context::GenBuffers(GLsizei n, GLuint* buffers) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (n < 0) {
SetError(GL_INVALID_VALUE);
return;
}
for (GLsizei i = 0; i < n; ++i) {
nb::scoped_ptr<BufferImpl> buffer_impl = impl_->CreateBuffer();
SB_DCHECK(buffer_impl);
nb::scoped_refptr<Buffer> buffer(new Buffer(buffer_impl.Pass()));
buffers[i] = resource_manager_->RegisterBuffer(buffer);
}
}
void Context::GenBuffersForVideoFrame(GLsizei n, GLuint* buffers) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (n < 0) {
SetError(GL_INVALID_VALUE);
return;
}
for (GLsizei i = 0; i < n; ++i) {
nb::scoped_ptr<BufferImpl> buffer_impl = impl_->CreateBufferForVideoFrame();
SB_DCHECK(buffer_impl);
buffers[i] = resource_manager_->RegisterBuffer(
nb::make_scoped_refptr(new Buffer(buffer_impl.Pass())));
}
}
void Context::FrontFace(GLenum mode) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if ((mode != GL_CW) && (mode != GL_CCW)) {
SetError(GL_INVALID_VALUE);
return;
}
// The default face is GL_CCW, per documentation at:
// https://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/glFrontFace.xml
if (mode != GL_CCW) {
SB_NOTIMPLEMENTED();
}
}
void Context::DeleteBuffers(GLsizei n, const GLuint* buffers) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (n < 0) {
SetError(GL_INVALID_VALUE);
return;
}
for (GLsizei i = 0; i < n; ++i) {
if (buffers[i] == 0) {
// Silently ignore 0 buffers.
continue;
}
nb::scoped_refptr<Buffer> buffer_object =
resource_manager_->DeregisterBuffer(buffers[i]);
if (!buffer_object) {
// The specification does not indicate that any error should be set
// in the case that there was an error deleting a specific buffer.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteBuffers.xml
return;
}
if (buffer_object->is_mapped()) {
// Buffer objects should be unmapped if they are deleted.
// https://www.khronos.org/opengles/sdk/docs/man3/html/glMapBufferRange.xhtml
buffer_object->Unmap();
}
// If a bound buffer is deleted, set the bound buffer to NULL. The buffer
// may be bound to any target, therefore we must scan them all.
const GLenum buffer_targets[3] = {GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER,
GL_PIXEL_UNPACK_BUFFER};
for (int target_index = 0; target_index < SB_ARRAY_SIZE(buffer_targets);
++target_index) {
GLenum target = buffer_targets[target_index];
nb::scoped_refptr<Buffer>* bound_buffer = GetBoundBufferForTarget(target);
SB_DCHECK(bound_buffer);
if ((*bound_buffer).get() == buffer_object.get()) {
*bound_buffer = NULL;
}
}
}
}
namespace {
bool IsValidBufferTarget(GLenum target) {
switch (target) {
case GL_ARRAY_BUFFER:
case GL_ELEMENT_ARRAY_BUFFER:
case GL_PIXEL_UNPACK_BUFFER:
return true;
break;
case GL_COPY_READ_BUFFER:
case GL_COPY_WRITE_BUFFER:
case GL_PIXEL_PACK_BUFFER:
case GL_TRANSFORM_FEEDBACK_BUFFER:
case GL_UNIFORM_BUFFER:
SB_NOTIMPLEMENTED() << "Buffer target " << target
<< " is not supported "
"in glimp.";
default:
return false;
}
}
} // namespace
void Context::BindBuffer(GLenum target, GLuint buffer) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (!IsValidBufferTarget(target)) {
SetError(GL_INVALID_ENUM);
return;
}
nb::scoped_refptr<Buffer>* bound_buffer = GetBoundBufferForTarget(target);
SB_DCHECK(bound_buffer);
nb::scoped_refptr<Buffer> buffer_object;
if (buffer != 0) {
buffer_object = resource_manager_->GetBuffer(buffer);
if (!buffer_object) {
// The buffer to be bound is invalid.
SB_NOTIMPLEMENTED()
<< "Creating buffers with glBindBuffer () not supported";
return;
}
}
*bound_buffer = buffer_object;
}
void Context::BufferData(GLenum target,
GLsizeiptr size,
const GLvoid* data,
GLenum usage) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (size < 0) {
SetError(GL_INVALID_VALUE);
return;
}
if (usage != GL_STREAM_DRAW && usage != GL_STATIC_DRAW &&
usage != GL_DYNAMIC_DRAW) {
SetError(GL_INVALID_ENUM);
return;
}
if (!IsValidBufferTarget(target)) {
SetError(GL_INVALID_ENUM);
return;
}
nb::scoped_refptr<Buffer> bound_buffer = *GetBoundBufferForTarget(target);
if (bound_buffer == 0) {
SetError(GL_INVALID_OPERATION);
return;
}
if (bound_buffer->is_mapped()) {
// According to the specification, we must unmap the buffer if its data
// store is recreated with glBufferData.
// https://www.khronos.org/opengles/sdk/docs/man3/html/glMapBufferRange.xhtml
bound_buffer->Unmap();
}
if (!bound_buffer->Allocate(usage, size)) {
SetError(GL_OUT_OF_MEMORY);
return;
}
if (data) {
if (!bound_buffer->SetData(0, size, data)) {
SetError(GL_OUT_OF_MEMORY);
return;
}
}
}
void Context::BufferSubData(GLenum target,
GLintptr offset,
GLsizeiptr size,
const GLvoid* data) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (size < 0 || offset < 0) {
SetError(GL_INVALID_VALUE);
return;
}
if (!IsValidBufferTarget(target)) {
SetError(GL_INVALID_ENUM);
return;
}
nb::scoped_refptr<Buffer> bound_buffer = *GetBoundBufferForTarget(target);
if (bound_buffer == 0) {
SetError(GL_INVALID_OPERATION);
return;
}
if (offset + size > bound_buffer->size_in_bytes()) {
SetError(GL_INVALID_VALUE);
return;
}
if (bound_buffer->is_mapped()) {
// According to the specification, we must unmap the buffer if its data
// store is recreated with glBufferData.
// https://www.khronos.org/opengles/sdk/docs/man3/html/glMapBufferRange.xhtml
bound_buffer->Unmap();
}
// Nothing in the specification says there should be an error if data
// is NULL.
if (data) {
if (!bound_buffer->SetData(offset, size, data)) {
SetError(GL_OUT_OF_MEMORY);
return;
}
}
}
namespace {
// This function is based off of the logic described in the "Errors" section
// of the specification:
// https://www.khronos.org/opengles/sdk/docs/man3/html/glMapBufferRange.xhtml
bool MapBufferRangeAccessFlagsAreValid(GLbitfield access) {
if (access & ~(GL_MAP_READ_BIT | GL_MAP_WRITE_BIT |
GL_MAP_INVALIDATE_RANGE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT |
GL_MAP_FLUSH_EXPLICIT_BIT | GL_MAP_UNSYNCHRONIZED_BIT)) {
return false;
}
if (!(access & (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT))) {
return false;
}
if ((access & GL_MAP_READ_BIT) &&
(access & (GL_MAP_INVALIDATE_RANGE_BIT | GL_MAP_INVALIDATE_RANGE_BIT |
GL_MAP_UNSYNCHRONIZED_BIT))) {
return false;
}
if ((access & GL_MAP_FLUSH_EXPLICIT_BIT) && !(access & GL_MAP_WRITE_BIT)) {
return false;
}
return true;
}
} // namespace
void* Context::MapBufferRange(GLenum target,
GLintptr offset,
GLsizeiptr length,
GLbitfield access) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (!IsValidBufferTarget(target)) {
SetError(GL_INVALID_ENUM);
return NULL;
}
nb::scoped_refptr<Buffer> bound_buffer = *GetBoundBufferForTarget(target);
if (bound_buffer == 0) {
SetError(GL_INVALID_OPERATION);
return NULL;
}
if (offset < 0 || length < 0 ||
offset + length > bound_buffer->size_in_bytes()) {
SetError(GL_INVALID_VALUE);
return NULL;
}
if (bound_buffer->is_mapped()) {
SetError(GL_INVALID_OPERATION);
return NULL;
}
if (!MapBufferRangeAccessFlagsAreValid(access)) {
SetError(GL_INVALID_OPERATION);
return NULL;
}
SB_DCHECK(access & GL_MAP_INVALIDATE_BUFFER_BIT)
<< "glimp requires the GL_MAP_INVALIDATE_BUFFER_BIT flag to be set.";
SB_DCHECK(access & GL_MAP_UNSYNCHRONIZED_BIT)
<< "glimp requres the GL_MAP_UNSYNCHRONIZED_BIT flag to be set.";
SB_DCHECK(!(access & GL_MAP_FLUSH_EXPLICIT_BIT))
<< "glimp does not support the GL_MAP_FLUSH_EXPLICIT_BIT flag.";
SB_DCHECK(length == bound_buffer->size_in_bytes())
<< "glimp only supports mapping the entire buffer.";
void* mapped = bound_buffer->Map();
if (!mapped) {
SetError(GL_OUT_OF_MEMORY);
}
return mapped;
}
bool Context::UnmapBuffer(GLenum target) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (!IsValidBufferTarget(target)) {
SetError(GL_INVALID_ENUM);
return GL_FALSE;
}
nb::scoped_refptr<Buffer> bound_buffer = *GetBoundBufferForTarget(target);
if (bound_buffer == 0) {
SetError(GL_INVALID_OPERATION);
return GL_FALSE;
}
if (bound_buffer->is_mapped()) {
return bound_buffer->Unmap();
} else {
// The specification is unclear on what to do in the case where the buffer
// was not mapped to begin with, so we return GL_FALSE in this case.
// https://www.khronos.org/opengles/sdk/docs/man3/html/glMapBufferRange.xhtml
return GL_FALSE;
}
}
void Context::LineWidth(GLfloat width) {
if (width <= 0) {
SetError(GL_INVALID_VALUE);
return;
}
const GLfloat kDefaultLineWidth = 1.0f;
if (fabs(width - kDefaultLineWidth) > 0.01f * kDefaultLineWidth) {
SB_NOTIMPLEMENTED();
}
}
void Context::MakeCurrent(egl::Surface* draw, egl::Surface* read) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
SB_DCHECK(current_thread_ == kSbThreadInvalid ||
current_thread_ == SbThreadGetCurrent());
current_thread_ = SbThreadGetCurrent();
if (!has_been_current_) {
// According to the documentation for eglMakeCurrent(),
// https://www.khronos.org/registry/egl/sdk/docs/man/html/eglMakeCurrent.xhtml
// we should set the scissor and viewport to the draw surface the first
// time this context is made current.
Scissor(0, 0, draw->impl()->GetWidth(), draw->impl()->GetHeight());
Viewport(0, 0, draw->impl()->GetWidth(), draw->impl()->GetHeight());
// Setup the default framebuffers and bind them.
SB_DCHECK(!default_draw_framebuffer_);
SB_DCHECK(!default_read_framebuffer_);
SB_DCHECK(!draw_state_.framebuffer);
default_draw_framebuffer_ = new Framebuffer(draw);
default_read_framebuffer_ = new Framebuffer(read);
draw_state_.framebuffer = default_draw_framebuffer_;
read_framebuffer_ = default_read_framebuffer_;
has_been_current_ = true;
}
// Update our draw and read framebuffers, marking the framebuffer dirty
// flag if the default framebuffer is the one that is currently bound.
if (default_draw_framebuffer_->color_attachment_surface() != draw) {
default_draw_framebuffer_->UpdateColorSurface(draw);
if (draw_state_.framebuffer == default_draw_framebuffer_) {
draw_state_dirty_flags_.framebuffer_dirty = true;
}
}
if (default_read_framebuffer_->color_attachment_surface() != read) {
default_read_framebuffer_->UpdateColorSurface(read);
}
}
void Context::ReleaseContext() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
SB_DCHECK(current_thread_ != kSbThreadInvalid);
SB_DCHECK(current_thread_ == SbThreadGetCurrent());
SB_DCHECK(has_been_current_);
current_thread_ = kSbThreadInvalid;
}
nb::scoped_refptr<Buffer>* Context::GetBoundBufferForTarget(GLenum target) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
switch (target) {
case GL_ARRAY_BUFFER:
draw_state_dirty_flags_.array_buffer_dirty = true;
return &draw_state_.array_buffer;
case GL_ELEMENT_ARRAY_BUFFER:
draw_state_dirty_flags_.element_array_buffer_dirty = true;
return &draw_state_.element_array_buffer;
case GL_PIXEL_UNPACK_BUFFER:
return &bound_pixel_unpack_buffer_;
}
SB_NOTREACHED();
return NULL;
}
nb::scoped_refptr<Texture>* Context::GetBoundTextureForTarget(GLenum target,
GLenum texture) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
switch (target) {
case GL_TEXTURE_2D:
return &(texture_units_[texture - GL_TEXTURE0]);
case GL_TEXTURE_CUBE_MAP:
SB_NOTREACHED() << "Currently unimplemented in glimp.";
return NULL;
}
SB_NOTREACHED();
return NULL;
}
void Context::SetupExtensionsString() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
// Extract the list of extensions from the platform-specific implementation
// and then turn them into a string.
ContextImpl::ExtensionList impl_extensions = impl_->GetExtensions();
extensions_string_ = "";
for (int i = 0; i < impl_extensions.size(); ++i) {
if (i > 0) {
extensions_string_ += " ";
}
extensions_string_ += impl_extensions[i];
}
// Since extensions_string_ will eventually be returned as an array of
// unsigned chars, make sure that none of the characters in it are negative.
for (int i = 0; i < extensions_string_.size(); ++i) {
SB_DCHECK(extensions_string_[i] > 0);
}
}
void Context::GenTextures(GLsizei n, GLuint* textures) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (n < 0) {
SetError(GL_INVALID_VALUE);
return;
}
for (GLsizei i = 0; i < n; ++i) {
nb::scoped_ptr<TextureImpl> texture_impl = impl_->CreateTexture();
SB_DCHECK(texture_impl);
nb::scoped_refptr<Texture> texture(new Texture(texture_impl.Pass()));
textures[i] = resource_manager_->RegisterTexture(texture);
}
}
void Context::DeleteTextures(GLsizei n, const GLuint* textures) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (n < 0) {
SetError(GL_INVALID_VALUE);
return;
}
for (GLsizei i = 0; i < n; ++i) {
if (textures[i] == 0) {
// Silently ignore 0 textures.
continue;
}
nb::scoped_refptr<Texture> texture_object =
resource_manager_->DeregisterTexture(textures[i]);
if (!texture_object) {
// The specification does not indicate that any error should be set
// in the case that there was an error deleting a specific texture.
// https://www.khronos.org/opengles/sdk/1.1/docs/man/glDeleteTextures.xml
return;
}
// If a bound texture is deleted, set the bound texture to NULL. The texture
// may be bound to multiple texture units, including texture units that are
// not active, therefore we must scan them all.
for (int texture_index = 0;
texture_index < impl_->GetMaxFragmentTextureUnits(); ++texture_index) {
GLenum texture_unit = texture_index + GL_TEXTURE0;
nb::scoped_refptr<Texture>* bound_texture =
GetBoundTextureForTarget(GL_TEXTURE_2D, texture_unit);
if ((*bound_texture).get() == texture_object.get()) {
enabled_textures_dirty_ = true;
*bound_texture = NULL;
}
}
}
}
void Context::ActiveTexture(GLenum texture) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (texture < GL_TEXTURE0 ||
texture >= GL_TEXTURE0 + impl_->GetMaxFragmentTextureUnits()) {
SetError(GL_INVALID_ENUM);
return;
}
active_texture_ = texture;
}
void Context::BindTexture(GLenum target, GLuint texture) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_TEXTURE_2D && target != GL_TEXTURE_CUBE_MAP) {
SetError(GL_INVALID_ENUM);
return;
}
nb::scoped_refptr<Texture>* bound_texture =
GetBoundTextureForTarget(target, active_texture_);
SB_DCHECK(bound_texture);
nb::scoped_refptr<Texture> texture_object;
if (texture != 0) {
texture_object = resource_manager_->GetTexture(texture);
if (!texture_object) {
// The texture to be bound is invalid.
SB_NOTIMPLEMENTED()
<< "Creating textures with glBindTexture() not supported";
return;
}
}
if ((*bound_texture).get() == texture_object.get()) {
// The new texture being bound is the same as the already the bound
// texture.
return;
}
*bound_texture = texture_object;
enabled_textures_dirty_ = true;
}
namespace {
Sampler::MinFilter MinFilterFromGLEnum(GLenum min_filter) {
switch (min_filter) {
case GL_NEAREST:
return Sampler::kMinFilterNearest;
case GL_LINEAR:
return Sampler::kMinFilterLinear;
case GL_NEAREST_MIPMAP_NEAREST:
return Sampler::kMinFilterNearestMipMapNearest;
case GL_NEAREST_MIPMAP_LINEAR:
return Sampler::kMinFilterNearestMipMapLinear;
case GL_LINEAR_MIPMAP_NEAREST:
return Sampler::kMinFilterLinearMipMapNearest;
case GL_LINEAR_MIPMAP_LINEAR:
return Sampler::kMinFilterLinearMipMapLinear;
default:
return Sampler::kMinFilterInvalid;
}
}
Sampler::MagFilter MagFilterFromGLEnum(GLenum mag_filter) {
switch (mag_filter) {
case GL_NEAREST:
return Sampler::kMagFilterNearest;
case GL_LINEAR:
return Sampler::kMagFilterLinear;
default:
return Sampler::kMagFilterInvalid;
}
}
Sampler::WrapMode WrapModeFromGLEnum(GLenum wrap_mode) {
switch (wrap_mode) {
case GL_CLAMP_TO_EDGE:
return Sampler::kWrapModeClampToEdge;
case GL_MIRRORED_REPEAT:
return Sampler::kWrapModeMirroredRepeat;
case GL_REPEAT:
return Sampler::kWrapModeRepeat;
default:
return Sampler::kWrapModeInvalid;
}
}
GLenum GLEnumFromMinFilter(Sampler::MinFilter min_filter) {
switch (min_filter) {
case Sampler::kMinFilterNearest:
return GL_NEAREST;
case Sampler::kMinFilterLinear:
return GL_LINEAR;
case Sampler::kMinFilterNearestMipMapNearest:
return GL_NEAREST_MIPMAP_NEAREST;
case Sampler::kMinFilterNearestMipMapLinear:
return GL_NEAREST_MIPMAP_LINEAR;
case Sampler::kMinFilterLinearMipMapNearest:
return GL_LINEAR_MIPMAP_NEAREST;
case Sampler::kMinFilterLinearMipMapLinear:
return GL_LINEAR_MIPMAP_LINEAR;
default: {
SB_NOTREACHED();
return GL_LINEAR;
}
}
}
GLenum GLEnumFromMagFilter(Sampler::MagFilter mag_filter) {
switch (mag_filter) {
case Sampler::kMagFilterNearest:
return GL_NEAREST;
case Sampler::kMagFilterLinear:
return GL_LINEAR;
default: {
SB_NOTREACHED();
return GL_LINEAR;
}
}
}
GLenum GLEnumFromWrapMode(Sampler::WrapMode wrap_mode) {
switch (wrap_mode) {
case Sampler::kWrapModeClampToEdge:
return GL_CLAMP_TO_EDGE;
case Sampler::kWrapModeMirroredRepeat:
return GL_MIRRORED_REPEAT;
case Sampler::kWrapModeRepeat:
return GL_REPEAT;
default: {
SB_NOTREACHED();
return GL_REPEAT;
}
}
}
} // namespace
void Context::GetTexParameteriv(GLenum target, GLenum pname, GLint* params) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
Sampler* active_sampler = (*GetBoundTextureForTarget(target, active_texture_))
->sampler_parameters();
switch (pname) {
case GL_TEXTURE_MAG_FILTER: {
*params = GLEnumFromMagFilter(active_sampler->mag_filter);
} break;
case GL_TEXTURE_MIN_FILTER: {
*params = GLEnumFromMinFilter(active_sampler->min_filter);
} break;
case GL_TEXTURE_WRAP_S: {
*params = GLEnumFromWrapMode(active_sampler->wrap_s);
} break;
case GL_TEXTURE_WRAP_T: {
*params = GLEnumFromWrapMode(active_sampler->wrap_t);
} break;
default: {
SetError(GL_INVALID_ENUM);
return;
}
}
}
void Context::TexParameteri(GLenum target, GLenum pname, GLint param) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
Sampler* active_sampler = (*GetBoundTextureForTarget(target, active_texture_))
->sampler_parameters();
switch (pname) {
case GL_TEXTURE_MAG_FILTER: {
Sampler::MagFilter mag_filter = MagFilterFromGLEnum(param);
if (mag_filter == Sampler::kMagFilterInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
active_sampler->mag_filter = mag_filter;
} break;
case GL_TEXTURE_MIN_FILTER: {
Sampler::MinFilter min_filter = MinFilterFromGLEnum(param);
if (min_filter == Sampler::kMinFilterInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
active_sampler->min_filter = min_filter;
} break;
case GL_TEXTURE_WRAP_S:
case GL_TEXTURE_WRAP_T: {
Sampler::WrapMode wrap_mode = WrapModeFromGLEnum(param);
if (wrap_mode == Sampler::kWrapModeInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
if (pname == GL_TEXTURE_WRAP_S) {
active_sampler->wrap_s = wrap_mode;
} else {
SB_DCHECK(pname == GL_TEXTURE_WRAP_T);
active_sampler->wrap_t = wrap_mode;
}
} break;
default: {
SetError(GL_INVALID_ENUM);
return;
}
}
enabled_textures_dirty_ = true;
}
namespace {
bool TextureFormatIsValid(GLenum format) {
switch (format) {
case GL_ALPHA:
case GL_RGB:
case GL_RGBA:
case GL_LUMINANCE:
case GL_LUMINANCE_ALPHA:
case GL_RED_INTEGER:
return true;
default:
return false;
}
}
bool TextureTypeIsValid(GLenum type) {
switch (type) {
case GL_UNSIGNED_BYTE:
case GL_UNSIGNED_SHORT:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_5_5_5_1:
return true;
default:
return false;
}
}
// Converts a GL type and format to a glimp PixelFormat. Information about
// the different possible values for type and format can be found here:
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glTexImage2D.xml
// Note that glimp may not support all possible formats described above.
PixelFormat PixelFormatFromGLTypeAndFormat(GLenum format, GLenum type) {
if (type == GL_UNSIGNED_BYTE) {
switch (format) {
case GL_RGBA:
return kPixelFormatRGBA8;
case GL_ALPHA:
return kPixelFormatA8;
case GL_LUMINANCE_ALPHA:
return kPixelFormatBA8;
}
} else if (type == GL_UNSIGNED_SHORT && format == GL_RED_INTEGER) {
return kPixelFormatA16;
}
return kPixelFormatInvalid;
}
} // namespace
void Context::TexImage2D(GLenum target,
GLint level,
GLint internalformat,
GLsizei width,
GLsizei height,
GLint border,
GLenum format,
GLenum type,
const GLvoid* pixels) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_TEXTURE_2D) {
SB_NOTREACHED() << "Only target=GL_TEXTURE_2D is supported in glimp.";
SetError(GL_INVALID_ENUM);
return;
}
if (width < 0 || height < 0 || level < 0 || border != 0) {
SetError(GL_INVALID_VALUE);
return;
}
int max_texture_size = impl_->GetMaxTextureSize();
if (width > max_texture_size || height > max_texture_size) {
SetError(GL_INVALID_VALUE);
return;
}
if (format != internalformat) {
SetError(GL_INVALID_OPERATION);
return;
}
if (!TextureFormatIsValid(format)) {
SetError(GL_INVALID_ENUM);
return;
}
if (!TextureTypeIsValid(type)) {
SetError(GL_INVALID_ENUM);
return;
}
// Fold format and type together to determine a single glimp PixelFormat
// value for the incoming data.
PixelFormat pixel_format = PixelFormatFromGLTypeAndFormat(format, type);
SB_DCHECK(pixel_format != kPixelFormatInvalid)
<< "Pixel format not supported by glimp.";
nb::scoped_refptr<Texture> texture_object =
*GetBoundTextureForTarget(target, active_texture_);
if (!texture_object) {
// According to the specification, no error is generated if no texture
// is bound.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glTexImage2D.xml
return;
}
// The incoming pixel data should be aligned as the client has specified
// that it will be.
SB_DCHECK(nb::IsAligned(pixels, static_cast<size_t>(unpack_alignment_)));
// Determine pitch taking into account glPixelStorei() settings.
int pitch_in_bytes = GetPitchForTextureData(width, pixel_format);
texture_object->Initialize(level, pixel_format, width, height);
if (bound_pixel_unpack_buffer_) {
if (bound_pixel_unpack_buffer_->is_mapped() ||
height * pitch_in_bytes > bound_pixel_unpack_buffer_->size_in_bytes()) {
SetError(GL_INVALID_OPERATION);
return;
}
texture_object->UpdateDataFromBuffer(
level, 0, 0, width, height, pitch_in_bytes, bound_pixel_unpack_buffer_,
nb::AsInteger(pixels));
} else if (pixels) {
if (!texture_object->UpdateData(level, 0, 0, width, height, pitch_in_bytes,
pixels)) {
SetError(GL_OUT_OF_MEMORY);
}
}
}
void Context::TexSubImage2D(GLenum target,
GLint level,
GLint xoffset,
GLint yoffset,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
const GLvoid* pixels) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_TEXTURE_2D) {
SB_NOTREACHED() << "Only target=GL_TEXTURE_2D is supported in glimp.";
SetError(GL_INVALID_ENUM);
return;
}
if (width < 0 || height < 0 || level < 0 || xoffset < 0 || yoffset < 0) {
SetError(GL_INVALID_VALUE);
}
if (!TextureFormatIsValid(format)) {
SetError(GL_INVALID_ENUM);
return;
}
if (!TextureTypeIsValid(type)) {
SetError(GL_INVALID_ENUM);
return;
}
PixelFormat pixel_format = PixelFormatFromGLTypeAndFormat(format, type);
SB_DCHECK(pixel_format != kPixelFormatInvalid)
<< "Pixel format not supported by glimp.";
nb::scoped_refptr<Texture> texture_object =
*GetBoundTextureForTarget(target, active_texture_);
if (!texture_object) {
// According to the specification, no error is generated if no texture
// is bound.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glTexSubImage2D.xml
return;
}
if (!texture_object->texture_allocated() ||
pixel_format != texture_object->pixel_format()) {
SetError(GL_INVALID_OPERATION);
return;
}
if (xoffset + width > texture_object->width() ||
yoffset + height > texture_object->height()) {
SetError(GL_INVALID_VALUE);
return;
}
// The incoming pixel data should be aligned as the client has specified
// that it will be.
SB_DCHECK(nb::IsAligned(pixels, static_cast<size_t>(unpack_alignment_)));
// Determine pitch taking into account glPixelStorei() settings.
int pitch_in_bytes = GetPitchForTextureData(width, pixel_format);
if (bound_pixel_unpack_buffer_) {
if (bound_pixel_unpack_buffer_->is_mapped() ||
height * pitch_in_bytes > bound_pixel_unpack_buffer_->size_in_bytes()) {
SetError(GL_INVALID_OPERATION);
return;
}
texture_object->UpdateDataFromBuffer(
level, xoffset, yoffset, width, height, pitch_in_bytes,
bound_pixel_unpack_buffer_, nb::AsInteger(pixels));
} else {
if (!texture_object->UpdateData(level, xoffset, yoffset, width, height,
pitch_in_bytes, pixels)) {
SetError(GL_OUT_OF_MEMORY);
}
}
}
void Context::CopyTexSubImage2D(GLenum target,
GLint level,
GLint xoffset,
GLint yoffset,
GLint x,
GLint y,
GLsizei width,
GLsizei height) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_TEXTURE_2D) {
SB_NOTREACHED() << "Only target=GL_TEXTURE_2D is supported in glimp.";
SetError(GL_INVALID_ENUM);
return;
}
if (width < 0 || height < 0 || level < 0 || xoffset < 0 || yoffset < 0) {
SetError(GL_INVALID_VALUE);
}
nb::scoped_refptr<Texture> texture_object =
*GetBoundTextureForTarget(target, active_texture_);
if (!texture_object) {
// According to the specification, no error is generated if no texture
// is bound.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glCopyTexSubImage2D.xml
return;
}
if (!texture_object->texture_allocated()) {
SetError(GL_INVALID_OPERATION);
return;
}
if (xoffset + width > texture_object->width() ||
yoffset + height > texture_object->height()) {
SetError(GL_INVALID_VALUE);
return;
}
if (read_framebuffer_->CheckFramebufferStatus() != GL_FRAMEBUFFER_COMPLETE) {
SetError(GL_INVALID_FRAMEBUFFER_OPERATION);
return;
}
// The pixels in the rectangle are processed exactly as if glReadPixels had
// been called with format set to GL_RGBA, but the process stops just after
// conversion of RGBA values. Subsequent processing is identical to that
// described for glTexSubImage2D.
uint8_t pixels[read_framebuffer_->GetWidth() *
read_framebuffer_->GetHeight() *
BytesPerPixel(kPixelFormatRGBA8)];
ReadPixels(0, 0, read_framebuffer_->GetWidth(),
read_framebuffer_->GetHeight(), GL_RGBA, GL_UNSIGNED_BYTE,
&pixels);
// If any of the pixels within the specified rectangle are outside the
// framebuffer associated with the current rendering context, then the values
// obtained for those pixels are undefined. Make sure that we only access
// pixels within a valid range.
x = std::max(0, x);
y = std::max(0, y);
width = std::min(read_framebuffer_->GetWidth() - x, width);
height = std::min(read_framebuffer_->GetHeight() - y, height);
int pitch_in_bytes =
read_framebuffer_->GetWidth() * BytesPerPixel(kPixelFormatRGBA8);
if (!texture_object->UpdateData(
level, xoffset, yoffset, width, height, pitch_in_bytes,
&pixels[y * pitch_in_bytes + x * BytesPerPixel(kPixelFormatRGBA8)])) {
SetError(GL_OUT_OF_MEMORY);
}
}
void Context::GenFramebuffers(GLsizei n, GLuint* framebuffers) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (n < 0) {
SetError(GL_INVALID_VALUE);
return;
}
for (GLsizei i = 0; i < n; ++i) {
nb::scoped_refptr<Framebuffer> framebuffer(new Framebuffer());
framebuffers[i] = resource_manager_->RegisterFramebuffer(framebuffer);
}
}
void Context::DeleteFramebuffers(GLsizei n, const GLuint* framebuffers) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (n < 0) {
SetError(GL_INVALID_VALUE);
return;
}
for (GLsizei i = 0; i < n; ++i) {
if (framebuffers[i] == 0) {
// Silently ignore 0 framebuffers.
continue;
}
nb::scoped_refptr<Framebuffer> framebuffer_object =
resource_manager_->DeregisterFramebuffer(framebuffers[i]);
if (!framebuffer_object) {
// The specification does not indicate that any error should be set
// in the case that there was an error deleting a specific framebuffer.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteFramebuffers.xml
return;
}
// If a bound framebuffer is deleted, set the bound framebuffer back to
// the default framebuffer.
if (framebuffer_object == draw_state_.framebuffer) {
SetBoundDrawFramebufferToDefault();
}
if (framebuffer_object == read_framebuffer_) {
SetBoundReadFramebufferToDefault();
}
}
}
void Context::BindFramebuffer(GLenum target, GLuint framebuffer) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_FRAMEBUFFER) {
SetError(GL_INVALID_ENUM);
return;
}
if (framebuffer == 0) {
SetBoundDrawFramebufferToDefault();
SetBoundReadFramebufferToDefault();
return;
}
nb::scoped_refptr<Framebuffer> framebuffer_object =
resource_manager_->GetFramebuffer(framebuffer);
if (!framebuffer_object) {
// According to the specification, no error is generated if the buffer is
// invalid.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glBindFramebuffer.xml
SB_DLOG(WARNING) << "Could not glBindFramebuffer() to invalid framebuffer.";
return;
}
draw_state_.framebuffer = framebuffer_object;
draw_state_dirty_flags_.framebuffer_dirty = true;
read_framebuffer_ = framebuffer_object;
}
void Context::FramebufferTexture2D(GLenum target,
GLenum attachment,
GLenum textarget,
GLuint texture,
GLint level) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_FRAMEBUFFER) {
SetError(GL_INVALID_ENUM);
return;
}
if (IsDefaultDrawFramebufferBound() || IsDefaultReadFramebufferBound()) {
SetError(GL_INVALID_OPERATION);
return;
}
if (textarget != GL_TEXTURE_2D) {
SB_NOTREACHED() << "Only textarget=GL_TEXTURE_2D is supported in glimp.";
SetError(GL_INVALID_ENUM);
return;
}
if (attachment != GL_COLOR_ATTACHMENT0) {
SB_NOTREACHED()
<< "Only attachment=GL_COLOR_ATTACHMENT0 is supported in glimp.";
SetError(GL_INVALID_ENUM);
return;
}
nb::scoped_refptr<Texture> texture_object;
if (texture != 0) {
texture_object = resource_manager_->GetTexture(texture);
if (!texture_object) {
SetError(GL_INVALID_OPERATION);
return;
}
}
draw_state_.framebuffer->AttachTexture2D(texture_object, level);
}
GLenum Context::CheckFramebufferStatus(GLenum target) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_FRAMEBUFFER) {
SetError(GL_INVALID_ENUM);
return 0;
}
return draw_state_.framebuffer->CheckFramebufferStatus();
}
void Context::FramebufferRenderbuffer(GLenum target,
GLenum attachment,
GLenum renderbuffertarget,
GLuint renderbuffer) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_FRAMEBUFFER || renderbuffertarget != GL_RENDERBUFFER) {
SetError(GL_INVALID_ENUM);
return;
}
SB_DCHECK(attachment != GL_COLOR_ATTACHMENT0)
<< "glimp does not support attaching color renderbuffers to "
"framebuffers.";
if (IsDefaultDrawFramebufferBound()) {
SetError(GL_INVALID_OPERATION);
return;
}
nb::scoped_refptr<Renderbuffer> renderbuffer_object = NULL;
// Resolve the actual render buffer object to bind if we are not binding
// render buffer 0, in which case we leave the value to set as NULL.
if (renderbuffer != 0) {
renderbuffer_object = resource_manager_->GetRenderbuffer(renderbuffer);
if (!renderbuffer_object) {
SetError(GL_INVALID_OPERATION);
return;
}
}
switch (attachment) {
case GL_DEPTH_ATTACHMENT:
draw_state_.framebuffer->SetDepthAttachment(renderbuffer_object);
break;
case GL_STENCIL_ATTACHMENT:
draw_state_.framebuffer->SetStencilAttachment(renderbuffer_object);
break;
default:
SetError(GL_INVALID_ENUM);
}
}
void Context::GenRenderbuffers(GLsizei n, GLuint* renderbuffers) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (n < 0) {
SetError(GL_INVALID_VALUE);
return;
}
for (GLsizei i = 0; i < n; ++i) {
nb::scoped_refptr<Renderbuffer> renderbuffer(new Renderbuffer());
renderbuffers[i] = resource_manager_->RegisterRenderbuffer(renderbuffer);
}
}
void Context::DeleteRenderbuffers(GLsizei n, const GLuint* renderbuffers) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (n < 0) {
SetError(GL_INVALID_VALUE);
return;
}
for (GLsizei i = 0; i < n; ++i) {
if (renderbuffers[i] == 0) {
// Silently ignore 0 renderbuffers.
continue;
}
nb::scoped_refptr<Renderbuffer> renderbuffer_object =
resource_manager_->DeregisterRenderbuffer(renderbuffers[i]);
if (!renderbuffer_object) {
// The specification does not indicate that any error should be set
// in the case that there was an error deleting a specific renderbuffer.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteRenderbuffers.xml
return;
}
// If we're deleting the currently bound renderbuffer, set the currently
// bound render buffer to NULL.
if (renderbuffer_object == bound_renderbuffer_) {
bound_renderbuffer_ = NULL;
}
}
}
void Context::BindRenderbuffer(GLenum target, GLuint renderbuffer) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_RENDERBUFFER) {
SetError(GL_INVALID_ENUM);
return;
}
if (renderbuffer == 0) {
bound_renderbuffer_ = NULL;
return;
}
nb::scoped_refptr<Renderbuffer> renderbuffer_object =
resource_manager_->GetRenderbuffer(renderbuffer);
if (!renderbuffer_object) {
// According to the specification, no error is generated if the buffer is
// invalid.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glBindRenderbuffer.xml
SB_DLOG(WARNING)
<< "Could not glBindRenderbuffer() to invalid renderbuffer.";
return;
}
bound_renderbuffer_ = renderbuffer_object;
}
namespace {
// Valid formats as listed here:
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glRenderbufferStorage.xml
bool RenderbufferStorageFormatIsValid(GLenum internalformat) {
switch (internalformat) {
case GL_RGBA4:
case GL_RGB565:
case GL_RGB5_A1:
case GL_DEPTH_COMPONENT16:
case GL_STENCIL_INDEX8:
return true;
default:
return false;
}
}
} // namespace
void Context::RenderbufferStorage(GLenum target,
GLenum internalformat,
GLsizei width,
GLsizei height) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (target != GL_RENDERBUFFER) {
SetError(GL_INVALID_ENUM);
return;
}
if (!RenderbufferStorageFormatIsValid(internalformat)) {
SetError(GL_INVALID_ENUM);
return;
}
if (width < 0 || height < 0) {
SetError(GL_INVALID_VALUE);
return;
}
if (bound_renderbuffer_ == 0) {
SetError(GL_INVALID_OPERATION);
return;
}
bound_renderbuffer_->Initialize(internalformat, width, height);
}
void Context::StencilMask(GLuint mask) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (mask != 0xFFFFFFFF) {
// If we are not setting stencil mask to its initial value then indicate
// that our implementation is lacking.
SB_NOTIMPLEMENTED();
}
}
void Context::ClearStencil(GLint s) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (s != 0) {
// If we are not setting stencil clear to its initial value then indicate
// that our implementation is lacking.
SB_NOTIMPLEMENTED();
}
}
void Context::Viewport(GLint x, GLint y, GLsizei width, GLsizei height) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
draw_state_.viewport.rect = nb::Rect<int>(x, y, width, height);
draw_state_dirty_flags_.viewport_dirty = true;
}
void Context::Scissor(GLint x, GLint y, GLsizei width, GLsizei height) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (x < 0) {
SB_DLOG(WARNING) << "glScissor() x coordinate is set to negative.";
}
if (y < 0) {
SB_DLOG(WARNING) << "glScissor() y coordinate is set to negative.";
}
draw_state_.scissor.rect = nb::Rect<int>(x, y, width, height);
draw_state_dirty_flags_.scissor_dirty = true;
}
namespace {
// Converts from the GLenum passed into glVertexAttribPointer() to the enum
// defined in VertexAttribute.
static VertexAttributeType VertexAttributeTypeFromGLEnum(GLenum type) {
switch (type) {
case GL_BYTE:
return kVertexAttributeTypeByte;
case GL_UNSIGNED_BYTE:
return kVertexAttributeTypeUnsignedByte;
case GL_SHORT:
return kVertexAttributeTypeShort;
case GL_UNSIGNED_SHORT:
return kVertexAttributeTypeUnsignedShort;
case GL_FIXED:
return kVertexAttributeTypeFixed;
case GL_FLOAT:
return kVertexAttributeTypeFloat;
case GL_HALF_FLOAT:
return kVertexAttributeTypeHalfFloat;
default:
return kVertexAttributeTypeInvalid;
}
}
} // namespace
void Context::VertexAttribPointer(GLuint indx,
GLint size,
GLenum type,
GLboolean normalized,
GLsizei stride,
const GLvoid* ptr) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (indx >= GL_MAX_VERTEX_ATTRIBS) {
SetError(GL_INVALID_VALUE);
return;
}
if (size < 1 || size > 4) {
SetError(GL_INVALID_VALUE);
return;
}
if (stride < 0) {
SetError(GL_INVALID_VALUE);
return;
}
VertexAttributeType vertex_attribute_type =
VertexAttributeTypeFromGLEnum(type);
if (vertex_attribute_type == kVertexAttributeTypeInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
vertex_attrib_map_[indx] =
VertexAttributeArray(size, vertex_attribute_type, normalized, stride,
static_cast<int>(reinterpret_cast<uintptr_t>(ptr)));
if (enabled_vertex_attribs_.find(indx) != enabled_vertex_attribs_.end()) {
enabled_vertex_attribs_dirty_ = true;
}
}
void Context::EnableVertexAttribArray(GLuint index) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (index >= GL_MAX_VERTEX_ATTRIBS) {
SetError(GL_INVALID_VALUE);
return;
}
enabled_vertex_attribs_.insert(index);
enabled_vertex_attribs_dirty_ = true;
}
void Context::DisableVertexAttribArray(GLuint index) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (index >= GL_MAX_VERTEX_ATTRIBS) {
SetError(GL_INVALID_VALUE);
return;
}
enabled_vertex_attribs_.erase(index);
enabled_vertex_attribs_dirty_ = true;
}
void Context::VertexAttribfv(GLuint indx,
int elem_size,
const GLfloat* values) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
SB_DCHECK(elem_size > 0);
SB_DCHECK(elem_size <= 4);
VertexAttributeConstant* value = &const_vertex_attrib_map_[indx];
memset(value, 0, sizeof(*value));
for (int i = 0; i < elem_size; ++i) {
value->data[i] = values[i];
}
value->size = elem_size;
value->type = kVertexAttributeTypeFloat;
enabled_vertex_attribs_dirty_ = true;
}
GLint Context::GetUniformLocation(GLuint program, const GLchar* name) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (name[0] == 'g' && name[1] == 'l' && name[2] == '_') {
// |name| is not allowed to begin with the reserved prefix, "gl_".
return -1;
}
nb::scoped_refptr<Program> program_object =
resource_manager_->GetProgram(program);
if (!program_object) {
SetError(GL_INVALID_VALUE);
return -1;
}
if (!program_object->linked()) {
SetError(GL_INVALID_OPERATION);
return -1;
}
return program_object->GetUniformLocation(name);
}
void Context::Uniformiv(GLint location,
GLsizei count,
GLsizei elem_size,
const GLint* v) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
SB_DCHECK(elem_size >= 1 && elem_size <= 4);
if (count < 0) {
SetError(GL_INVALID_VALUE);
return;
}
if (!draw_state_.used_program) {
SetError(GL_INVALID_VALUE);
return;
}
GLenum result =
draw_state_.used_program->Uniformiv(location, count, elem_size, v);
if (result == GL_NO_ERROR) {
draw_state_dirty_flags_.uniforms_dirty.Mark(location);
} else {
SetError(result);
}
}
void Context::Uniformfv(GLint location,
GLsizei count,
GLsizei elem_size,
const GLfloat* v) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
SB_DCHECK(elem_size >= 1 && elem_size <= 4);
if (count < 0) {
SetError(GL_INVALID_VALUE);
return;
}
if (!draw_state_.used_program) {
SetError(GL_INVALID_VALUE);
return;
}
GLenum result =
draw_state_.used_program->Uniformfv(location, count, elem_size, v);
if (result == GL_NO_ERROR) {
draw_state_dirty_flags_.uniforms_dirty.Mark(location);
} else {
SetError(result);
}
}
void Context::UniformMatrixfv(GLint location,
GLsizei count,
GLboolean transpose,
GLsizei dim_size,
const GLfloat* value) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
SB_DCHECK(dim_size >= 2 && dim_size <= 4);
if (transpose != GL_FALSE) {
SetError(GL_INVALID_VALUE);
return;
}
if (!draw_state_.used_program) {
SetError(GL_INVALID_VALUE);
return;
}
GLenum result = draw_state_.used_program->UniformMatrixfv(location, count,
dim_size, value);
if (result == GL_NO_ERROR) {
draw_state_dirty_flags_.uniforms_dirty.Mark(location);
} else {
SetError(result);
}
}
namespace {
DrawMode DrawModeFromGLEnum(GLenum mode) {
switch (mode) {
case GL_POINTS:
return kDrawModePoints;
case GL_LINE_STRIP:
return kDrawModeLineStrip;
case GL_LINE_LOOP:
return kDrawModeLineLoop;
case GL_LINES:
return kDrawModeLines;
case GL_TRIANGLE_STRIP:
return kDrawModeTriangleStrip;
case GL_TRIANGLE_FAN:
return kDrawModeTriangleFan;
case GL_TRIANGLES:
return kDrawModeTriangles;
default:
return kDrawModeInvalid;
}
}
} // namespace
void Context::DrawArrays(GLenum mode, GLint first, GLsizei count) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (count < 0) {
SetError(GL_INVALID_VALUE);
return;
}
if (draw_state_.framebuffer->CheckFramebufferStatus() !=
GL_FRAMEBUFFER_COMPLETE) {
SetError(GL_INVALID_FRAMEBUFFER_OPERATION);
return;
}
DrawMode draw_mode = DrawModeFromGLEnum(mode);
if (draw_mode == kDrawModeInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
SB_DCHECK(draw_state_.array_buffer)
<< "glimp only supports vertices from vertex buffers.";
CompressDrawStateForDrawCall();
impl_->DrawArrays(draw_mode, first, count, draw_state_,
&draw_state_dirty_flags_);
}
namespace {
IndexDataType IndexDataTypeFromGLenum(GLenum type) {
switch (type) {
case GL_UNSIGNED_BYTE:
return kIndexDataTypeUnsignedByte;
case GL_UNSIGNED_SHORT:
return kIndexDataTypeUnsignedShort;
default:
return kIndexDataTypeInvalid;
}
}
} // namespace
void Context::DrawElements(GLenum mode,
GLsizei count,
GLenum type,
const GLvoid* indices) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (count < 0) {
SetError(GL_INVALID_VALUE);
return;
}
if (draw_state_.framebuffer->CheckFramebufferStatus() !=
GL_FRAMEBUFFER_COMPLETE) {
SetError(GL_INVALID_FRAMEBUFFER_OPERATION);
return;
}
DrawMode draw_mode = DrawModeFromGLEnum(mode);
if (draw_mode == kDrawModeInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
IndexDataType index_data_type = IndexDataTypeFromGLenum(type);
if (type == kIndexDataTypeInvalid) {
SetError(GL_INVALID_ENUM);
return;
}
SB_DCHECK(draw_state_.array_buffer)
<< "glimp only supports vertices from vertex buffers.";
SB_DCHECK(draw_state_.element_array_buffer)
<< "glimp only supports indices from element vertex buffers.";
CompressDrawStateForDrawCall();
impl_->DrawElements(draw_mode, count, index_data_type,
reinterpret_cast<intptr_t>(indices), draw_state_,
&draw_state_dirty_flags_);
}
namespace {
bool ValidReadPixelsFormat(GLenum format) {
switch (format) {
case GL_RGBA:
case GL_RGBA_INTEGER:
case GL_RED_INTEGER:
return true;
break;
default:
return false;
break;
}
}
bool ValidReadPixelsType(GLenum type) {
switch (type) {
case GL_UNSIGNED_BYTE:
case GL_UNSIGNED_INT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_FLOAT:
return true;
break;
default:
return false;
break;
}
}
} // namespace
void Context::ReadPixels(GLint x,
GLint y,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
GLvoid* pixels) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (!ValidReadPixelsFormat(format) || !ValidReadPixelsType(type)) {
SetError(GL_INVALID_ENUM);
return;
}
SB_DCHECK(format == GL_RGBA) << "glimp only supports format=GL_RGBA.";
SB_DCHECK(type == GL_UNSIGNED_BYTE)
<< "glimp only supports type=GL_UNSIGNED_BYTE.";
SB_DCHECK(read_framebuffer_->color_attachment_texture())
<< "glimp only supports glReadPixels() calls on non-default "
"framebuffers.";
if (x < 0 || y < 0 || width < 0 || height < 0 ||
x + width > read_framebuffer_->GetWidth() ||
y + height > read_framebuffer_->GetHeight()) {
SetError(GL_INVALID_VALUE);
return;
}
// Ensure that all GPU activity (in particular, texture writes) complete
// before we attempt to read pixel data from the texture.
Finish();
read_framebuffer_->color_attachment_texture()->ReadPixelsAsRGBA8(
x, y, width, height, width * BytesPerPixel(kPixelFormatRGBA8), pixels);
}
void Context::Flush() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
impl_->Flush();
}
void Context::Finish() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
impl_->Finish();
}
void Context::SwapBuffers() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
egl::Surface* surface = default_draw_framebuffer_->color_attachment_surface();
// If surface is a pixel buffer or a pixmap, eglSwapBuffers has no effect, and
// no error is generated.
// https://www.khronos.org/registry/egl/sdk/docs/man/html/eglSwapBuffers.xhtml
if (surface->impl()->IsWindowSurface()) {
Flush();
impl_->SwapBuffers(surface);
if (!has_swapped_buffers()) {
SbAtomicNoBarrier_Increment(&has_swapped_buffers_, 1);
}
}
}
bool Context::BindTextureToEGLSurface(egl::Surface* surface) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
SB_DCHECK(surface->GetTextureTarget() == EGL_TEXTURE_2D);
const nb::scoped_refptr<Texture>& current_texture =
*GetBoundTextureForTarget(GL_TEXTURE_2D, active_texture_);
if (!current_texture) {
SB_DLOG(WARNING) << "No texture is currently bound during call to "
"eglBindTexImage().";
return false;
}
SB_DCHECK(bound_egl_surfaces_.find(surface) == bound_egl_surfaces_.end());
bool success = current_texture->BindToEGLSurface(surface);
if (success) {
bound_egl_surfaces_[surface] = current_texture;
}
return success;
}
bool Context::ReleaseTextureFromEGLSurface(egl::Surface* surface) {
GLIMP_TRACE_EVENT0(__FUNCTION__);
std::map<egl::Surface*, nb::scoped_refptr<Texture> >::iterator found =
bound_egl_surfaces_.find(surface);
if (found == bound_egl_surfaces_.end()) {
SB_LOG(WARNING) << "Releasing EGLSurface was never bound to a texture in "
"this context.";
return false;
}
bool success = found->second->ReleaseFromEGLSurface(surface);
if (success) {
bound_egl_surfaces_.erase(found);
}
return success;
}
void Context::UpdateVertexAttribsInDrawState() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
// Setup the dense list of enabled vertex attributes.
draw_state_.vertex_attributes.clear();
for (std::set<unsigned int>::const_iterator iter =
enabled_vertex_attribs_.begin();
iter != enabled_vertex_attribs_.end(); ++iter) {
draw_state_.vertex_attributes.push_back(
std::make_pair(*iter, &vertex_attrib_map_[*iter]));
}
draw_state_.constant_vertex_attributes.clear();
for (std::map<unsigned int, VertexAttributeConstant>::iterator iter =
const_vertex_attrib_map_.begin();
iter != const_vertex_attrib_map_.end(); ++iter) {
// Add constant vertex attributes only if they do not have a vertex
// attribute array enabled for them.
if (enabled_vertex_attribs_.find(iter->first) ==
enabled_vertex_attribs_.end()) {
draw_state_.constant_vertex_attributes.push_back(
std::make_pair(iter->first, &iter->second));
}
}
draw_state_dirty_flags_.vertex_attributes_dirty = true;
enabled_vertex_attribs_dirty_ = false;
}
void Context::UpdateSamplersInDrawState() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
// Setup the list of enabled samplers.
draw_state_.textures.clear();
int max_active_textures = impl_->GetMaxFragmentTextureUnits();
for (int i = 0; i < max_active_textures; ++i) {
if (texture_units_[i]) {
draw_state_.textures.push_back(std::make_pair(
static_cast<unsigned int>(i), texture_units_[i].get()));
}
}
draw_state_dirty_flags_.textures_dirty = true;
enabled_textures_dirty_ = false;
}
void Context::CompressDrawStateForDrawCall() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (enabled_vertex_attribs_dirty_) {
UpdateVertexAttribsInDrawState();
SB_DCHECK(enabled_vertex_attribs_dirty_ == false);
}
if (enabled_textures_dirty_) {
UpdateSamplersInDrawState();
SB_DCHECK(enabled_textures_dirty_ == false);
}
}
void Context::MarkUsedProgramDirty() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
draw_state_dirty_flags_.MarkUsedProgram();
}
void Context::SetBoundDrawFramebufferToDefault() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (draw_state_.framebuffer != default_draw_framebuffer_) {
draw_state_.framebuffer = default_draw_framebuffer_;
draw_state_dirty_flags_.framebuffer_dirty = true;
}
}
void Context::SetBoundReadFramebufferToDefault() {
GLIMP_TRACE_EVENT0(__FUNCTION__);
if (read_framebuffer_ != default_read_framebuffer_) {
read_framebuffer_ = default_read_framebuffer_;
}
}
bool Context::IsDefaultDrawFramebufferBound() const {
GLIMP_TRACE_EVENT0(__FUNCTION__);
return draw_state_.framebuffer == default_draw_framebuffer_;
}
bool Context::IsDefaultReadFramebufferBound() const {
GLIMP_TRACE_EVENT0(__FUNCTION__);
return read_framebuffer_ == default_read_framebuffer_;
}
int Context::GetPitchForTextureData(int width, PixelFormat pixel_format) const {
GLIMP_TRACE_EVENT0(__FUNCTION__);
// The equations for determining the pitch are described here:
// https://www.khronos.org/opengles/sdk/docs/man3/html/glPixelStorei.xhtml
int n = BytesPerPixel(pixel_format);
int s = 1;
int len = unpack_row_length_ > 0 ? unpack_row_length_ : width;
int a = unpack_alignment_;
if (s >= a) {
return n * len;
} else {
return nb::AlignUp(s * n * len, a) / s;
}
}
SbAtomic32 Context::has_swapped_buffers_ = 0;
} // namespace gles
} // namespace glimp