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libGLESv2.cpp
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// Copyright 2016 The SwiftShader 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.
// libGLESv2.cpp: Implements the exported OpenGL ES 2.0 functions.
#include "main.h"
#include "mathutil.h"
#include "utilities.h"
#include "Buffer.h"
#include "Context.h"
#include "Fence.h"
#include "Framebuffer.h"
#include "Program.h"
#include "Renderbuffer.h"
#include "Shader.h"
#include "Texture.h"
#include "Query.h"
#include "TransformFeedback.h"
#include "VertexArray.h"
#include "common/debug.h"
#include "Common/Version.h"
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <GLES3/gl3.h>
#include <algorithm>
#include <limits>
namespace es2
{
static bool validImageSize(GLint level, GLsizei width, GLsizei height)
{
if(level < 0 || level >= IMPLEMENTATION_MAX_TEXTURE_LEVELS || width < 0 || height < 0)
{
return false;
}
return true;
}
}
namespace gl
{
using namespace es2;
void ActiveTexture(GLenum texture)
{
TRACE("(GLenum texture = 0x%X)", texture);
auto context = es2::getContext();
if(context)
{
if(texture < GL_TEXTURE0 || texture > GL_TEXTURE0 + es2::MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1)
{
return error(GL_INVALID_ENUM);
}
context->setActiveSampler(texture - GL_TEXTURE0);
}
}
void AttachShader(GLuint program, GLuint shader)
{
TRACE("(GLuint program = %d, GLuint shader = %d)", program, shader);
auto context = es2::getContext();
if(context)
{
es2::Program *programObject = context->getProgram(program);
es2::Shader *shaderObject = context->getShader(shader);
if(!programObject)
{
if(context->getShader(program))
{
return error(GL_INVALID_OPERATION);
}
else
{
return error(GL_INVALID_VALUE);
}
}
if(!shaderObject)
{
if(context->getProgram(shader))
{
return error(GL_INVALID_OPERATION);
}
else
{
return error(GL_INVALID_VALUE);
}
}
if(!programObject->attachShader(shaderObject))
{
return error(GL_INVALID_OPERATION);
}
}
}
void BeginQueryEXT(GLenum target, GLuint name)
{
TRACE("(GLenum target = 0x%X, GLuint name = %d)", target, name);
switch(target)
{
case GL_ANY_SAMPLES_PASSED_EXT:
case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
break;
default:
return error(GL_INVALID_ENUM);
}
if(name == 0)
{
return error(GL_INVALID_OPERATION);
}
auto context = es2::getContext();
if(context)
{
context->beginQuery(target, name);
}
}
void BindAttribLocation(GLuint program, GLuint index, const GLchar* name)
{
TRACE("(GLuint program = %d, GLuint index = %d, const GLchar* name = %s)", program, index, name);
if(index >= es2::MAX_VERTEX_ATTRIBS)
{
return error(GL_INVALID_VALUE);
}
auto context = es2::getContext();
if(context)
{
es2::Program *programObject = context->getProgram(program);
if(!programObject)
{
if(context->getShader(program))
{
return error(GL_INVALID_OPERATION);
}
else
{
return error(GL_INVALID_VALUE);
}
}
if(strncmp(name, "gl_", 3) == 0)
{
return error(GL_INVALID_OPERATION);
}
programObject->bindAttributeLocation(index, name);
}
}
void BindBuffer(GLenum target, GLuint buffer)
{
TRACE("(GLenum target = 0x%X, GLuint buffer = %d)", target, buffer);
auto context = es2::getContext();
if(context)
{
switch(target)
{
case GL_ARRAY_BUFFER:
context->bindArrayBuffer(buffer);
return;
case GL_ELEMENT_ARRAY_BUFFER:
context->bindElementArrayBuffer(buffer);
return;
case GL_COPY_READ_BUFFER:
context->bindCopyReadBuffer(buffer);
return;
case GL_COPY_WRITE_BUFFER:
context->bindCopyWriteBuffer(buffer);
return;
case GL_PIXEL_PACK_BUFFER:
context->bindPixelPackBuffer(buffer);
return;
case GL_PIXEL_UNPACK_BUFFER:
context->bindPixelUnpackBuffer(buffer);
return;
case GL_TRANSFORM_FEEDBACK_BUFFER:
context->bindTransformFeedbackBuffer(buffer);
return;
case GL_UNIFORM_BUFFER:
context->bindGenericUniformBuffer(buffer);
return;
default:
return error(GL_INVALID_ENUM);
}
}
}
void BindFramebuffer(GLenum target, GLuint framebuffer)
{
TRACE("(GLenum target = 0x%X, GLuint framebuffer = %d)", target, framebuffer);
if(target != GL_FRAMEBUFFER && target != GL_DRAW_FRAMEBUFFER && target != GL_READ_FRAMEBUFFER)
{
return error(GL_INVALID_ENUM);
}
auto context = es2::getContext();
if(context)
{
if(target == GL_READ_FRAMEBUFFER || target == GL_FRAMEBUFFER)
{
context->bindReadFramebuffer(framebuffer);
}
if(target == GL_DRAW_FRAMEBUFFER || target == GL_FRAMEBUFFER)
{
context->bindDrawFramebuffer(framebuffer);
}
}
}
void BindRenderbuffer(GLenum target, GLuint renderbuffer)
{
TRACE("(GLenum target = 0x%X, GLuint renderbuffer = %d)", target, renderbuffer);
if(target != GL_RENDERBUFFER)
{
return error(GL_INVALID_ENUM);
}
auto context = es2::getContext();
if(context)
{
// [OpenGL ES 2.0.25] Section 4.4.3 page 110
// [OpenGL ES 3.0.4] Section 4.4.2 page 204
// If renderbuffer is not zero, then the resulting renderbuffer object
// is a new state vector, initialized with a zero-sized memory buffer.
context->bindRenderbuffer(renderbuffer);
}
}
void BindTexture(GLenum target, GLuint texture)
{
TRACE("(GLenum target = 0x%X, GLuint texture = %d)", target, texture);
auto context = es2::getContext();
if(context)
{
es2::Texture *textureObject = context->getTexture(texture);
if(textureObject && textureObject->getTarget() != target && texture != 0)
{
return error(GL_INVALID_OPERATION);
}
switch(target)
{
case GL_TEXTURE_2D:
context->bindTexture(TEXTURE_2D, texture);
break;
case GL_TEXTURE_CUBE_MAP:
context->bindTexture(TEXTURE_CUBE, texture);
break;
case GL_TEXTURE_EXTERNAL_OES:
context->bindTexture(TEXTURE_EXTERNAL, texture);
break;
case GL_TEXTURE_2D_ARRAY:
context->bindTexture(TEXTURE_2D_ARRAY, texture);
break;
case GL_TEXTURE_3D:
context->bindTexture(TEXTURE_3D, texture);
break;
case GL_TEXTURE_RECTANGLE_ARB:
context->bindTexture(TEXTURE_2D_RECT, texture);
break;
default:
return error(GL_INVALID_ENUM);
}
}
}
void BlendColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha)
{
TRACE("(GLclampf red = %f, GLclampf green = %f, GLclampf blue = %f, GLclampf alpha = %f)",
red, green, blue, alpha);
auto context = es2::getContext();
if(context)
{
context->setBlendColor(es2::clamp01(red), es2::clamp01(green), es2::clamp01(blue), es2::clamp01(alpha));
}
}
void BlendEquationSeparate(GLenum modeRGB, GLenum modeAlpha)
{
TRACE("(GLenum modeRGB = 0x%X, GLenum modeAlpha = 0x%X)", modeRGB, modeAlpha);
switch(modeRGB)
{
case GL_FUNC_ADD:
case GL_FUNC_SUBTRACT:
case GL_FUNC_REVERSE_SUBTRACT:
case GL_MIN_EXT:
case GL_MAX_EXT:
break;
default:
return error(GL_INVALID_ENUM);
}
switch(modeAlpha)
{
case GL_FUNC_ADD:
case GL_FUNC_SUBTRACT:
case GL_FUNC_REVERSE_SUBTRACT:
case GL_MIN_EXT:
case GL_MAX_EXT:
break;
default:
return error(GL_INVALID_ENUM);
}
auto context = es2::getContext();
if(context)
{
context->setBlendEquation(modeRGB, modeAlpha);
}
}
void BlendEquation(GLenum mode)
{
BlendEquationSeparate(mode, mode);
}
void BlendFuncSeparate(GLenum srcRGB, GLenum dstRGB, GLenum srcAlpha, GLenum dstAlpha)
{
TRACE("(GLenum srcRGB = 0x%X, GLenum dstRGB = 0x%X, GLenum srcAlpha = 0x%X, GLenum dstAlpha = 0x%X)",
srcRGB, dstRGB, srcAlpha, dstAlpha);
switch(srcRGB)
{
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_SRC_COLOR:
case GL_DST_COLOR:
case GL_ONE_MINUS_DST_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
case GL_SRC_ALPHA_SATURATE:
break;
default:
return error(GL_INVALID_ENUM);
}
switch(dstRGB)
{
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_SRC_COLOR:
case GL_DST_COLOR:
case GL_ONE_MINUS_DST_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
break;
case GL_SRC_ALPHA_SATURATE:
break;
default:
return error(GL_INVALID_ENUM);
}
switch(srcAlpha)
{
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_SRC_COLOR:
case GL_DST_COLOR:
case GL_ONE_MINUS_DST_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
case GL_SRC_ALPHA_SATURATE:
break;
default:
return error(GL_INVALID_ENUM);
}
switch(dstAlpha)
{
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_SRC_COLOR:
case GL_DST_COLOR:
case GL_ONE_MINUS_DST_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
break;
case GL_SRC_ALPHA_SATURATE:
break;
default:
return error(GL_INVALID_ENUM);
}
auto context = es2::getContext();
if(context)
{
context->setBlendFactors(srcRGB, dstRGB, srcAlpha, dstAlpha);
}
}
void BlendFunc(GLenum sfactor, GLenum dfactor)
{
BlendFuncSeparate(sfactor, dfactor, sfactor, dfactor);
}
void BufferData(GLenum target, GLsizeiptr size, const GLvoid* data, GLenum usage)
{
size = static_cast<GLint>(size); // Work around issues with some 64-bit applications
TRACE("(GLenum target = 0x%X, GLsizeiptr size = %d, const GLvoid* data = %p, GLenum usage = %d)",
target, size, data, usage);
if(size < 0)
{
return error(GL_INVALID_VALUE);
}
switch(usage)
{
case GL_STREAM_DRAW:
case GL_STATIC_DRAW:
case GL_DYNAMIC_DRAW:
break;
case GL_STREAM_READ:
case GL_STREAM_COPY:
case GL_STATIC_READ:
case GL_STATIC_COPY:
case GL_DYNAMIC_READ:
case GL_DYNAMIC_COPY:
break;
default:
return error(GL_INVALID_ENUM);
}
auto context = es2::getContext();
if(context)
{
es2::Buffer *buffer = nullptr;
if(!context->getBuffer(target, &buffer))
{
return error(GL_INVALID_ENUM);
}
if(!buffer)
{
// A null buffer means that "0" is bound to the requested buffer target
return error(GL_INVALID_OPERATION);
}
buffer->bufferData(data, size, usage);
}
}
void BufferSubData(GLenum target, GLintptr offset, GLsizeiptr size, const GLvoid* data)
{
size = static_cast<GLint>(size); // Work around issues with some 64-bit applications
offset = static_cast<GLint>(offset);
TRACE("(GLenum target = 0x%X, GLintptr offset = %d, GLsizeiptr size = %d, const GLvoid* data = %p)",
target, offset, size, data);
if(size < 0 || offset < 0)
{
return error(GL_INVALID_VALUE);
}
auto context = es2::getContext();
if(context)
{
es2::Buffer *buffer = nullptr;
if(!context->getBuffer(target, &buffer))
{
return error(GL_INVALID_ENUM);
}
if(!buffer)
{
// A null buffer means that "0" is bound to the requested buffer target
return error(GL_INVALID_OPERATION);
}
if(buffer->isMapped())
{
// It is an invalid operation to update an already mapped buffer
return error(GL_INVALID_OPERATION);
}
if((size_t)size + offset > buffer->size())
{
return error(GL_INVALID_VALUE);
}
buffer->bufferSubData(data, size, offset);
}
}
GLenum CheckFramebufferStatus(GLenum target)
{
TRACE("(GLenum target = 0x%X)", target);
if(target != GL_FRAMEBUFFER && target != GL_DRAW_FRAMEBUFFER && target != GL_READ_FRAMEBUFFER)
{
return error(GL_INVALID_ENUM, 0);
}
auto context = es2::getContext();
if(context)
{
es2::Framebuffer *framebuffer = nullptr;
if(target == GL_READ_FRAMEBUFFER)
{
framebuffer = context->getReadFramebuffer();
}
else
{
framebuffer = context->getDrawFramebuffer();
}
if(!framebuffer)
{
return GL_FRAMEBUFFER_UNDEFINED_OES;
}
return framebuffer->completeness();
}
return 0;
}
void Clear(GLbitfield mask)
{
TRACE("(GLbitfield mask = %X)", mask);
if((mask & ~(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT)) != 0)
{
return error(GL_INVALID_VALUE);
}
auto context = es2::getContext();
if(context)
{
context->clear(mask);
}
}
void ClearColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha)
{
TRACE("(GLclampf red = %f, GLclampf green = %f, GLclampf blue = %f, GLclampf alpha = %f)",
red, green, blue, alpha);
auto context = es2::getContext();
if(context)
{
context->setClearColor(red, green, blue, alpha);
}
}
void ClearDepthf(GLclampf depth)
{
TRACE("(GLclampf depth = %f)", depth);
auto context = es2::getContext();
if(context)
{
context->setClearDepth(depth);
}
}
void ClearStencil(GLint s)
{
TRACE("(GLint s = %d)", s);
auto context = es2::getContext();
if(context)
{
context->setClearStencil(s);
}
}
void ColorMask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha)
{
TRACE("(GLboolean red = %d, GLboolean green = %d, GLboolean blue = %d, GLboolean alpha = %d)",
red, green, blue, alpha);
auto context = es2::getContext();
if(context)
{
context->setColorMask(red != GL_FALSE, green != GL_FALSE, blue != GL_FALSE, alpha != GL_FALSE);
}
}
void CompileShader(GLuint shader)
{
TRACE("(GLuint shader = %d)", shader);
auto context = es2::getContext();
if(context)
{
es2::Shader *shaderObject = context->getShader(shader);
if(!shaderObject)
{
if(context->getProgram(shader))
{
return error(GL_INVALID_OPERATION);
}
else
{
return error(GL_INVALID_VALUE);
}
}
shaderObject->compile();
}
}
void CompressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height,
GLint border, GLsizei imageSize, const GLvoid* data)
{
TRACE("(GLenum target = 0x%X, GLint level = %d, GLenum internalformat = 0x%X, GLsizei width = %d, "
"GLsizei height = %d, GLint border = %d, GLsizei imageSize = %d, const GLvoid* data = %p)",
target, level, internalformat, width, height, border, imageSize, data);
if(!validImageSize(level, width, height) || border != 0 || imageSize < 0)
{
return error(GL_INVALID_VALUE);
}
if(!IsCompressed(internalformat))
{
return error(GL_INVALID_ENUM);
}
if(border != 0)
{
return error(GL_INVALID_VALUE);
}
auto context = es2::getContext();
if(context)
{
if(level >= es2::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
{
return error(GL_INVALID_VALUE);
}
switch(target)
{
case GL_TEXTURE_2D:
if(width > (es2::IMPLEMENTATION_MAX_TEXTURE_SIZE >> level) ||
height > (es2::IMPLEMENTATION_MAX_TEXTURE_SIZE >> level))
{
return error(GL_INVALID_VALUE);
}
break;
case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
if(width != height)
{
return error(GL_INVALID_VALUE);
}
if(width > (es2::IMPLEMENTATION_MAX_CUBE_MAP_TEXTURE_SIZE >> level) ||
height > (es2::IMPLEMENTATION_MAX_CUBE_MAP_TEXTURE_SIZE >> level))
{
return error(GL_INVALID_VALUE);
}
break;
case GL_TEXTURE_RECTANGLE_ARB: // Rectangle textures cannot be compressed
default:
return error(GL_INVALID_ENUM);
}
if(imageSize != gl::ComputeCompressedSize(width, height, internalformat))
{
return error(GL_INVALID_VALUE);
}
GLenum validationError = context->getPixels(&data, GL_UNSIGNED_BYTE, imageSize);
if(validationError != GL_NO_ERROR)
{
return error(validationError);
}
if(target == GL_TEXTURE_2D || target == GL_TEXTURE_RECTANGLE_ARB)
{
es2::Texture2D *texture = context->getTexture2D(target);
if(!texture)
{
return error(GL_INVALID_OPERATION);
}
texture->setCompressedImage(level, internalformat, width, height, imageSize, data);
}
else if(es2::IsCubemapTextureTarget(target))
{
es2::TextureCubeMap *texture = context->getTextureCubeMap();
if(!texture)
{
return error(GL_INVALID_OPERATION);
}
texture->setCompressedImage(target, level, internalformat, width, height, imageSize, data);
}
else UNREACHABLE(target);
}
}
void CompressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height,
GLenum format, GLsizei imageSize, const GLvoid* data)
{
TRACE("(GLenum target = 0x%X, GLint level = %d, GLint xoffset = %d, GLint yoffset = %d, "
"GLsizei width = %d, GLsizei height = %d, GLenum format = 0x%X, "
"GLsizei imageSize = %d, const GLvoid* data = %p)",
target, level, xoffset, yoffset, width, height, format, imageSize, data);
if(!es2::IsTextureTarget(target))
{
return error(GL_INVALID_ENUM);
}
if(level < 0 || level >= es2::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
{
return error(GL_INVALID_VALUE);
}
if(xoffset < 0 || yoffset < 0 || !validImageSize(level, width, height) || imageSize < 0)
{
return error(GL_INVALID_VALUE);
}
if(!IsCompressed(format))
{
return error(GL_INVALID_ENUM);
}
if(imageSize != gl::ComputeCompressedSize(width, height, format))
{
return error(GL_INVALID_VALUE);
}
auto context = es2::getContext();
if(context)
{
if(xoffset % 4 != 0 || yoffset % 4 != 0)
{
// We wait to check the offsets until this point, because the multiple-of-four restriction does not exist unless DXT1 textures are supported
return error(GL_INVALID_OPERATION);
}
GLenum validationError = context->getPixels(&data, GL_UNSIGNED_BYTE, imageSize);
if(validationError != GL_NO_ERROR)
{
return error(validationError);
}
if(target == GL_TEXTURE_2D || target == GL_TEXTURE_RECTANGLE_ARB)
{
es2::Texture2D *texture = context->getTexture2D(target);
GLenum validationError = ValidateSubImageParams(true, false, target, level, xoffset, yoffset, width, height, format, GL_NONE, texture);
if(validationError != GL_NO_ERROR)
{
return error(validationError);
}
texture->subImageCompressed(level, xoffset, yoffset, width, height, format, imageSize, data);
}
else if(es2::IsCubemapTextureTarget(target))
{
es2::TextureCubeMap *texture = context->getTextureCubeMap();
GLenum validationError = ValidateSubImageParams(true, false, target, level, xoffset, yoffset, width, height, format, GL_NONE, texture);
if(validationError != GL_NO_ERROR)
{
return error(validationError);
}
texture->subImageCompressed(target, level, xoffset, yoffset, width, height, format, imageSize, data);
}
else UNREACHABLE(target);
}
}
void CopyTexImage2D(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border)
{
TRACE("(GLenum target = 0x%X, GLint level = %d, GLenum internalformat = 0x%X, "
"GLint x = %d, GLint y = %d, GLsizei width = %d, GLsizei height = %d, GLint border = %d)",
target, level, internalformat, x, y, width, height, border);
if(!validImageSize(level, width, height))
{
return error(GL_INVALID_VALUE);
}
if(border != 0)
{
return error(GL_INVALID_VALUE);
}
auto context = es2::getContext();
if(context)
{
switch(target)
{
case GL_TEXTURE_RECTANGLE_ARB:
if(level != 0)
{
return error(GL_INVALID_VALUE);
}
// Fall through to GL_TEXTURE_2D case.
case GL_TEXTURE_2D:
if(width > (es2::IMPLEMENTATION_MAX_TEXTURE_SIZE >> level) ||
height > (es2::IMPLEMENTATION_MAX_TEXTURE_SIZE >> level))
{
return error(GL_INVALID_VALUE);
}
break;
case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
if(width != height)
{
return error(GL_INVALID_VALUE);
}
if(width > (es2::IMPLEMENTATION_MAX_CUBE_MAP_TEXTURE_SIZE >> level) ||
height > (es2::IMPLEMENTATION_MAX_CUBE_MAP_TEXTURE_SIZE >> level))
{
return error(GL_INVALID_VALUE);
}
break;
default:
return error(GL_INVALID_ENUM);
}
es2::Framebuffer *framebuffer = context->getReadFramebuffer();
if(!framebuffer || (framebuffer->completeness() != GL_FRAMEBUFFER_COMPLETE))
{
return error(GL_INVALID_FRAMEBUFFER_OPERATION);
}
es2::Renderbuffer *source = framebuffer->getReadColorbuffer();
if(context->getReadFramebufferName() != 0 && (!source || source->getSamples() > 1))
{
return error(GL_INVALID_OPERATION);
}
GLenum colorbufferFormat = source->getFormat();
// Determine the sized internal format.
if(gl::IsUnsizedInternalFormat(internalformat))
{
if(colorbufferFormat == GL_RGB10_A2)
{
// Not supported with unsized internalformat.
// https://www.khronos.org/members/login/bugzilla/show_bug.cgi?id=9807#c56
return error(GL_INVALID_OPERATION);
}
if(gl::GetBaseInternalFormat(colorbufferFormat) == internalformat)
{
internalformat = colorbufferFormat;
}
else if(GetColorComponentType(colorbufferFormat) == GL_UNSIGNED_NORMALIZED && GetRedSize(colorbufferFormat) <= 8)
{
// TODO: Convert to the smallest format that fits all components.
// e.g. Copying RGBA4 to RGB should result in RGB565, not RGB8.
internalformat = gl::GetSizedInternalFormat(internalformat, GL_UNSIGNED_BYTE);
}
else if(GetColorComponentType(colorbufferFormat) == GL_INT)
{
internalformat = gl::GetSizedInternalFormat(internalformat, GL_INT);
}
else if(GetColorComponentType(colorbufferFormat) == GL_UNSIGNED_INT)
{
internalformat = gl::GetSizedInternalFormat(internalformat, GL_UNSIGNED_INT);
}
else if(GetColorComponentType(colorbufferFormat) == GL_FLOAT && GetRedSize(colorbufferFormat) == 16) // GL_EXT_color_buffer_half_float
{
internalformat = gl::GetSizedInternalFormat(internalformat, GL_HALF_FLOAT_OES);
}
else if(GetColorComponentType(colorbufferFormat) == GL_FLOAT && GetRedSize(colorbufferFormat) == 32) // GL_EXT_color_buffer_float
{
internalformat = gl::GetSizedInternalFormat(internalformat, GL_FLOAT);
}
else
{
UNIMPLEMENTED("internalformat = %x, colorbufferFormat = %X", internalformat, colorbufferFormat);
return error(GL_INVALID_OPERATION);
}
}
if(!ValidateCopyFormats(internalformat, colorbufferFormat))
{
return;
}
if(target == GL_TEXTURE_2D || target == GL_TEXTURE_RECTANGLE_ARB)
{
es2::Texture2D *texture = context->getTexture2D(target);
if(!texture)
{
return error(GL_INVALID_OPERATION);
}
texture->copyImage(level, internalformat, x, y, width, height, source);
}
else if(es2::IsCubemapTextureTarget(target))
{