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//
// Copyright 2016 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Format:
// A universal description of typed GPU storage. Across multiple
// renderer back-ends, there are common formats and some distinct
// permutations, this enum encapsulates them all. Formats apply to
// textures, but could also apply to any typed data.
#ifndef LIBANGLE_RENDERER_FORMAT_H_
#define LIBANGLE_RENDERER_FORMAT_H_
#include "libANGLE/renderer/FormatID_autogen.h"
#include "libANGLE/renderer/renderer_utils.h"
namespace angle
{
enum class FormatID;
extern const Format gFormatInfoTable[];
struct Format final : private angle::NonCopyable
{
inline constexpr Format(FormatID id,
GLenum glFormat,
GLenum fboFormat,
rx::MipGenerationFunction mipGen,
const rx::FastCopyFunctionMap &fastCopyFunctions,
rx::PixelReadFunction colorRead,
rx::PixelWriteFunction colorWrite,
GLenum componentType,
GLuint redBits,
GLuint greenBits,
GLuint blueBits,
GLuint alphaBits,
GLuint luminanceBits,
GLuint depthBits,
GLuint stencilBits,
GLuint pixelBytes,
GLuint componentAlignmentMask,
bool isBlock,
bool isFixed,
bool isScaled,
gl::VertexAttribType vertexAttribType);
static const Format &Get(FormatID id) { return gFormatInfoTable[static_cast<int>(id)]; }
static FormatID InternalFormatToID(GLenum internalFormat);
constexpr bool hasDepthOrStencilBits() const;
constexpr bool isLUMA() const;
constexpr bool isSint() const;
constexpr bool isUint() const;
constexpr bool isSnorm() const;
constexpr bool isUnorm() const;
constexpr bool isFloat() const;
constexpr bool isVertexTypeHalfFloat() const;
constexpr bool isInt() const { return isSint() || isUint(); }
constexpr bool isNorm() const { return isSnorm() || isUnorm(); }
constexpr bool isPureInt() const { return isInt() && !isScaled; }
bool operator==(const Format &other) const { return this->id == other.id; }
FormatID id;
// The closest matching GL internal format for the storage this format uses. Note that this
// may be a different internal format than the one this ANGLE format is used for.
GLenum glInternalFormat;
// The format we should report to the GL layer when querying implementation formats from a FBO.
// This might not be the same as the glInternalFormat, since some DXGI formats don't have
// matching GL format enums, like BGRA4, BGR5A1 and B5G6R6.
GLenum fboImplementationInternalFormat;
rx::MipGenerationFunction mipGenerationFunction;
rx::PixelReadFunction pixelReadFunction;
rx::PixelWriteFunction pixelWriteFunction;
// A map from a gl::FormatType to a fast pixel copy function for this format.
const rx::FastCopyFunctionMap &fastCopyFunctions;
GLenum componentType;
GLuint redBits;
GLuint greenBits;
GLuint blueBits;
GLuint alphaBits;
GLuint luminanceBits;
GLuint depthBits;
GLuint stencilBits;
GLuint pixelBytes;
// For 1-byte components, is 0x0. For 2-byte, is 0x1. For 4-byte, is 0x3. For all others,
// MAX_UINT.
GLuint componentAlignmentMask;
GLuint channelCount;
bool isBlock;
bool isFixed;
bool isScaled;
// For vertex formats only. Returns the "type" value for glVertexAttribPointer etc.
gl::VertexAttribType vertexAttribType;
};
constexpr GLuint GetChannelCount(GLuint redBits,
GLuint greenBits,
GLuint blueBits,
GLuint alphaBits,
GLuint luminanceBits,
GLuint depthBits,
GLuint stencilBits)
{
return (redBits > 0 ? 1 : 0) + (greenBits > 0 ? 1 : 0) + (blueBits > 0 ? 1 : 0) +
(alphaBits > 0 ? 1 : 0) + (luminanceBits > 0 ? 1 : 0) + (depthBits > 0 ? 1 : 0) +
(stencilBits > 0 ? 1 : 0);
}
constexpr Format::Format(FormatID id,
GLenum glFormat,
GLenum fboFormat,
rx::MipGenerationFunction mipGen,
const rx::FastCopyFunctionMap &fastCopyFunctions,
rx::PixelReadFunction colorRead,
rx::PixelWriteFunction colorWrite,
GLenum componentType,
GLuint redBits,
GLuint greenBits,
GLuint blueBits,
GLuint alphaBits,
GLuint luminanceBits,
GLuint depthBits,
GLuint stencilBits,
GLuint pixelBytes,
GLuint componentAlignmentMask,
bool isBlock,
bool isFixed,
bool isScaled,
gl::VertexAttribType vertexAttribType)
: id(id),
glInternalFormat(glFormat),
fboImplementationInternalFormat(fboFormat),
mipGenerationFunction(mipGen),
pixelReadFunction(colorRead),
pixelWriteFunction(colorWrite),
fastCopyFunctions(fastCopyFunctions),
componentType(componentType),
redBits(redBits),
greenBits(greenBits),
blueBits(blueBits),
alphaBits(alphaBits),
luminanceBits(luminanceBits),
depthBits(depthBits),
stencilBits(stencilBits),
pixelBytes(pixelBytes),
componentAlignmentMask(componentAlignmentMask),
channelCount(GetChannelCount(redBits,
greenBits,
blueBits,
alphaBits,
luminanceBits,
depthBits,
stencilBits)),
isBlock(isBlock),
isFixed(isFixed),
isScaled(isScaled),
vertexAttribType(vertexAttribType)
{}
constexpr bool Format::hasDepthOrStencilBits() const
{
return depthBits > 0 || stencilBits > 0;
}
constexpr bool Format::isLUMA() const
{
// There's no format with G or B without R
return redBits == 0 && (luminanceBits > 0 || alphaBits > 0);
}
constexpr bool Format::isSint() const
{
return componentType == GL_INT;
}
constexpr bool Format::isUint() const
{
return componentType == GL_UNSIGNED_INT;
}
constexpr bool Format::isSnorm() const
{
return componentType == GL_SIGNED_NORMALIZED;
}
constexpr bool Format::isUnorm() const
{
return componentType == GL_UNSIGNED_NORMALIZED;
}
constexpr bool Format::isFloat() const
{
return componentType == GL_FLOAT;
}
constexpr bool Format::isVertexTypeHalfFloat() const
{
return vertexAttribType == gl::VertexAttribType::HalfFloat;
}
} // namespace angle
#endif // LIBANGLE_RENDERER_FORMAT_H_