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// Copyright 2016 The Cobalt Authors. 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 <math.h>
#include <iomanip>
#include "starboard/common/log.h"
#include "starboard/event.h"
#include "starboard/input.h"
#include "starboard/memory.h"
#include "starboard/system.h"
#include "starboard/window.h"
#if SB_API_VERSION < 11
// This example uses the updated EGL and GLES Starboard interfaces implemented
// in Starboard API version 11. These interfaces substantially changed how EGL
// and GLES are used, and are not compatible with previous methodologies. For
// additional information, please refer to the following files:
//
// //starboard/egl.h
// //starboard/gles.h
//
// //cobalt/renderer/egl_and_gles.h
void SbEventHandle(const SbEvent* event) {
SB_NOTREACHED() << "SB_API_VERSION must be >= 11.";
}
#else // SB_API_VERSION >= 11
#include "starboard/egl.h"
#include "starboard/gles.h"
#define EGL_CALL(x) \
do { \
SbGetEglInterface()->x; \
SB_DCHECK((SbGetEglInterface()->eglGetError()) == SB_EGL_SUCCESS); \
} while (false)
#define EGL_CALL_SIMPLE(x) (SbGetEglInterface()->x)
#define GL_CALL(x) \
do { \
SbGetGlesInterface()->x; \
SB_DCHECK((SbGetGlesInterface()->glGetError()) == SB_GL_NO_ERROR); \
} while (false)
#define GL_CALL_SIMPLE(x) (SbGetGlesInterface()->x)
namespace {
SbEglInt32 const kAttributeList[] = {SB_EGL_RED_SIZE,
8,
SB_EGL_GREEN_SIZE,
8,
SB_EGL_BLUE_SIZE,
8,
SB_EGL_ALPHA_SIZE,
8,
SB_EGL_STENCIL_SIZE,
0,
SB_EGL_BUFFER_SIZE,
32,
SB_EGL_SURFACE_TYPE,
SB_EGL_WINDOW_BIT | SB_EGL_PBUFFER_BIT,
SB_EGL_COLOR_BUFFER_TYPE,
SB_EGL_RGB_BUFFER,
SB_EGL_CONFORMANT,
SB_EGL_OPENGL_ES2_BIT,
SB_EGL_RENDERABLE_TYPE,
SB_EGL_OPENGL_ES2_BIT,
SB_EGL_NONE};
} // namespace
class Application {
public:
Application();
~Application();
private:
// The callback function passed to SbEventSchedule(). Its purpose is to
// forward to the non-static RenderScene() method.
static void RenderSceneEventCallback(void* param);
// Renders one frame of the animated scene, incrementing |frame_| each time
// it is called.
void RenderScene();
// The current frame we are rendering, initialized to 0 and incremented after
// each frame.
int frame_;
// The SbWindow within which we will perform our rendering.
SbWindow window_;
SbEglDisplay display_;
SbEglSurface surface_;
SbEglContext context_;
SbEglInt32 egl_surface_width_;
SbEglInt32 egl_surface_height_;
};
Application::Application() {
frame_ = 0;
SbWindowOptions options;
SbWindowSetDefaultOptions(&options);
window_ = SbWindowCreate(&options);
SB_CHECK(SbWindowIsValid(window_));
display_ = EGL_CALL_SIMPLE(eglGetDisplay(SB_EGL_DEFAULT_DISPLAY));
SB_CHECK(SB_EGL_SUCCESS == EGL_CALL_SIMPLE(eglGetError()));
SB_CHECK(SB_EGL_NO_DISPLAY != display_);
EGL_CALL(eglInitialize(display_, NULL, NULL));
// Some EGL drivers can return a first config that doesn't allow
// eglCreateWindowSurface(), with no differences in SbEglConfig attribute
// values from configs that do allow that. To handle that, we have to attempt
// eglCreateWindowSurface() until we find a config that succeeds.
// First, query how many configs match the given attribute list.
SbEglInt32 num_configs = 0;
EGL_CALL(eglChooseConfig(display_, kAttributeList, NULL, 0, &num_configs));
SB_CHECK(0 != num_configs);
// Allocate space to receive the matching configs and retrieve them.
SbEglConfig* configs = reinterpret_cast<SbEglConfig*>(
SbMemoryAllocate(num_configs * sizeof(SbEglConfig)));
EGL_CALL(eglChooseConfig(display_, kAttributeList, configs, num_configs,
&num_configs));
SbEglNativeWindowType native_window =
(SbEglNativeWindowType)SbWindowGetPlatformHandle(window_);
SbEglConfig config;
// Find the first config that successfully allow a window surface to be
// created.
for (int config_number = 0; config_number < num_configs; ++config_number) {
config = configs[config_number];
surface_ = EGL_CALL_SIMPLE(
eglCreateWindowSurface(display_, config, native_window, NULL));
if (SB_EGL_SUCCESS == EGL_CALL_SIMPLE(eglGetError()))
break;
}
SB_DCHECK(surface_ != SB_EGL_NO_SURFACE);
SbMemoryDeallocate(configs);
EGL_CALL(
eglQuerySurface(display_, surface_, SB_EGL_WIDTH, &egl_surface_width_));
EGL_CALL(
eglQuerySurface(display_, surface_, SB_EGL_HEIGHT, &egl_surface_height_));
SB_DCHECK(egl_surface_width_ > 0);
SB_DCHECK(egl_surface_height_ > 0);
// Create the GLES2 or GLEX3 Context.
context_ = SB_EGL_NO_CONTEXT;
SbEglInt32 context_attrib_list[] = {
SB_EGL_CONTEXT_CLIENT_VERSION, 3, SB_EGL_NONE,
};
#if SB_API_VERSION < 12 && defined(GLES3_SUPPORTED)
// Attempt to create an OpenGL ES 3.0 context.
context_ = EGL_CALL_SIMPLE(eglCreateContext(
display_, config, SB_EGL_NO_CONTEXT, context_attrib_list));
#endif
if (context_ == SB_EGL_NO_CONTEXT) {
// Create an OpenGL ES 2.0 context.
context_attrib_list[1] = 2;
context_ = EGL_CALL_SIMPLE(eglCreateContext(
display_, config, SB_EGL_NO_CONTEXT, context_attrib_list));
}
SB_CHECK(SB_EGL_SUCCESS == EGL_CALL_SIMPLE(eglGetError()));
SB_CHECK(context_ != SB_EGL_NO_CONTEXT);
/* connect the context to the surface */
EGL_CALL(eglMakeCurrent(display_, surface_, surface_, context_));
RenderScene();
}
Application::~Application() {
// Cleanup all used resources.
EGL_CALL(eglMakeCurrent(display_, SB_EGL_NO_SURFACE, SB_EGL_NO_SURFACE,
SB_EGL_NO_CONTEXT));
EGL_CALL(eglDestroyContext(display_, context_));
EGL_CALL(eglDestroySurface(display_, surface_));
EGL_CALL(eglTerminate(display_));
SbWindowDestroy(window_);
}
void Application::RenderSceneEventCallback(void* param) {
// Forward the call to the application instance specified as the parameter.
Application* application = static_cast<Application*>(param);
application->RenderScene();
}
namespace {
float getIntensity(int frame, float rate) {
float radian = 2 * M_PI * frame / rate;
return 0.5 + 0.5 * sin(radian);
}
} // namespace
void Application::RenderScene() {
// Render a moving and color changing rectangle using glClear() and
// glScissor().
GL_CALL_SIMPLE(glEnable(SB_GL_SCISSOR_TEST));
float radian = 2 * M_PI * frame_ / 600.0f;
int offset_x = egl_surface_height_ * sin(radian) / 3.6;
int offset_y = egl_surface_height_ * cos(radian) / 3.6;
int block_width = egl_surface_width_ / 16;
int block_height = egl_surface_height_ / 9;
int center_x = (egl_surface_width_ - block_width) / 2;
int center_y = (egl_surface_height_ - block_height) / 2;
GL_CALL(glScissor(center_x + offset_x, center_y + offset_y, block_width,
block_height));
GL_CALL(glClearColor(getIntensity(frame_, 55.0f), getIntensity(frame_, 60.0f),
getIntensity(frame_, 62.5f), 1.0));
GL_CALL(glClear(SB_GL_COLOR_BUFFER_BIT));
GL_CALL(glFlush());
EGL_CALL(eglSwapBuffers(display_, surface_));
// Schedule another frame render ASAP.
SbEventSchedule(&Application::RenderSceneEventCallback, this, 0);
++frame_;
}
Application* s_application = NULL;
// Simple Starboard window event handling to kick off our color animating
// application.
void SbEventHandle(const SbEvent* event) {
switch (event->type) {
case kSbEventTypeStart: {
// Create the application, after which it will use SbEventSchedule()
// on itself to trigger a frame update until the application is
// terminated.
s_application = new Application();
} break;
case kSbEventTypeStop: {
// Shutdown the application.
delete s_application;
} break;
default: {}
}
}
#endif // SB_API_VERSION < 11