mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
753 lines
25 KiB
C++
753 lines
25 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim: set ts=8 sts=4 et sw=4 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "GLReadTexImageHelper.h"
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#include "gfx2DGlue.h"
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#include "gfxTypes.h"
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#include "GLContext.h"
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#include "OGLShaderProgram.h"
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#include "ScopedGLHelpers.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/Move.h"
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namespace mozilla {
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namespace gl {
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using namespace mozilla::gfx;
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GLReadTexImageHelper::GLReadTexImageHelper(GLContext* gl)
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: mGL(gl)
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{
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mPrograms[0] = 0;
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mPrograms[1] = 0;
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mPrograms[2] = 0;
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mPrograms[3] = 0;
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}
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GLReadTexImageHelper::~GLReadTexImageHelper()
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{
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mGL->fDeleteProgram(mPrograms[0]);
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mGL->fDeleteProgram(mPrograms[1]);
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mGL->fDeleteProgram(mPrograms[2]);
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mGL->fDeleteProgram(mPrograms[3]);
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}
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static const GLchar
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readTextureImageVS[] =
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"attribute vec2 aVertex;\n"
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"attribute vec2 aTexCoord;\n"
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"varying vec2 vTexCoord;\n"
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"void main() { gl_Position = vec4(aVertex, 0, 1); vTexCoord = aTexCoord; }";
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static const GLchar
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readTextureImageFS_TEXTURE_2D[] =
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"#ifdef GL_ES\n"
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"precision mediump float;\n"
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"#endif\n"
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"varying vec2 vTexCoord;\n"
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"uniform sampler2D uTexture;\n"
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"void main() { gl_FragColor = texture2D(uTexture, vTexCoord); }";
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static const GLchar
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readTextureImageFS_TEXTURE_2D_BGRA[] =
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"#ifdef GL_ES\n"
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"precision mediump float;\n"
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"#endif\n"
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"varying vec2 vTexCoord;\n"
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"uniform sampler2D uTexture;\n"
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"void main() { gl_FragColor = texture2D(uTexture, vTexCoord).bgra; }";
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static const GLchar
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readTextureImageFS_TEXTURE_EXTERNAL[] =
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"#extension GL_OES_EGL_image_external : require\n"
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"#ifdef GL_ES\n"
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"precision mediump float;\n"
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"#endif\n"
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"varying vec2 vTexCoord;\n"
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"uniform samplerExternalOES uTexture;\n"
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"void main() { gl_FragColor = texture2D(uTexture, vTexCoord); }";
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static const GLchar
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readTextureImageFS_TEXTURE_RECTANGLE[] =
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"#extension GL_ARB_texture_rectangle\n"
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"#ifdef GL_ES\n"
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"precision mediump float;\n"
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"#endif\n"
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"varying vec2 vTexCoord;\n"
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"uniform sampler2DRect uTexture;\n"
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"void main() { gl_FragColor = texture2DRect(uTexture, vTexCoord).bgra; }";
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GLuint
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GLReadTexImageHelper::TextureImageProgramFor(GLenum aTextureTarget,
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int aConfig)
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{
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int variant = 0;
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const GLchar* readTextureImageFS = nullptr;
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if (aTextureTarget == LOCAL_GL_TEXTURE_2D) {
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if (aConfig & mozilla::layers::ENABLE_TEXTURE_RB_SWAP) {
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// Need to swizzle R/B.
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readTextureImageFS = readTextureImageFS_TEXTURE_2D_BGRA;
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variant = 1;
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} else {
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readTextureImageFS = readTextureImageFS_TEXTURE_2D;
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variant = 0;
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}
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} else if (aTextureTarget == LOCAL_GL_TEXTURE_EXTERNAL) {
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readTextureImageFS = readTextureImageFS_TEXTURE_EXTERNAL;
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variant = 2;
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} else if (aTextureTarget == LOCAL_GL_TEXTURE_RECTANGLE) {
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readTextureImageFS = readTextureImageFS_TEXTURE_RECTANGLE;
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variant = 3;
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}
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/* This might be overkill, but assure that we don't access out-of-bounds */
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MOZ_ASSERT((size_t) variant < ArrayLength(mPrograms));
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if (!mPrograms[variant]) {
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GLuint vs = mGL->fCreateShader(LOCAL_GL_VERTEX_SHADER);
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const GLchar* vsSourcePtr = &readTextureImageVS[0];
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mGL->fShaderSource(vs, 1, &vsSourcePtr, nullptr);
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mGL->fCompileShader(vs);
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GLuint fs = mGL->fCreateShader(LOCAL_GL_FRAGMENT_SHADER);
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mGL->fShaderSource(fs, 1, &readTextureImageFS, nullptr);
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mGL->fCompileShader(fs);
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GLuint program = mGL->fCreateProgram();
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mGL->fAttachShader(program, vs);
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mGL->fAttachShader(program, fs);
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mGL->fBindAttribLocation(program, 0, "aVertex");
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mGL->fBindAttribLocation(program, 1, "aTexCoord");
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mGL->fLinkProgram(program);
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GLint success;
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mGL->fGetProgramiv(program, LOCAL_GL_LINK_STATUS, &success);
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if (!success) {
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mGL->fDeleteProgram(program);
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program = 0;
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}
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mGL->fDeleteShader(vs);
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mGL->fDeleteShader(fs);
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mPrograms[variant] = program;
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}
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return mPrograms[variant];
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}
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bool
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GLReadTexImageHelper::DidGLErrorOccur(const char* str)
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{
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GLenum error = mGL->fGetError();
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if (error != LOCAL_GL_NO_ERROR) {
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printf_stderr("GL ERROR: %s (0x%04x) %s\n",
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mGL->GLErrorToString(error), error, str);
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return true;
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}
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return false;
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}
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static bool
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GetActualReadFormats(GLContext* gl,
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GLenum destFormat, GLenum destType,
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GLenum& readFormat, GLenum& readType)
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{
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if (destFormat == LOCAL_GL_RGBA &&
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destType == LOCAL_GL_UNSIGNED_BYTE)
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{
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readFormat = destFormat;
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readType = destType;
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return true;
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}
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bool fallback = true;
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if (gl->IsGLES()) {
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GLenum auxFormat = 0;
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GLenum auxType = 0;
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gl->fGetIntegerv(LOCAL_GL_IMPLEMENTATION_COLOR_READ_FORMAT, (GLint*)&auxFormat);
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gl->fGetIntegerv(LOCAL_GL_IMPLEMENTATION_COLOR_READ_TYPE, (GLint*)&auxType);
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if (destFormat == auxFormat &&
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destType == auxType)
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{
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fallback = false;
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}
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} else {
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switch (destFormat) {
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case LOCAL_GL_RGB: {
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if (destType == LOCAL_GL_UNSIGNED_SHORT_5_6_5_REV)
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fallback = false;
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break;
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}
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case LOCAL_GL_BGRA: {
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if (destType == LOCAL_GL_UNSIGNED_INT_8_8_8_8_REV)
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fallback = false;
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break;
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}
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}
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}
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if (fallback) {
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readFormat = LOCAL_GL_RGBA;
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readType = LOCAL_GL_UNSIGNED_BYTE;
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return false;
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} else {
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readFormat = destFormat;
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readType = destType;
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return true;
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}
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}
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static void
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SwapRAndBComponents(DataSourceSurface* surf)
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{
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DataSourceSurface::MappedSurface map;
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MOZ_ALWAYS_TRUE( surf->Map(DataSourceSurface::MapType::READ_WRITE, &map) );
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MOZ_ASSERT(map.mStride >= 0);
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const size_t rowBytes = surf->GetSize().width*4;
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const size_t rowHole = map.mStride - rowBytes;
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uint8_t* row = map.mData;
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if (!row) {
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MOZ_ASSERT(false, "SwapRAndBComponents: Failed to get data from"
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" DataSourceSurface.");
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surf->Unmap();
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return;
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}
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const size_t rows = surf->GetSize().height;
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for (size_t i = 0; i < rows; i++) {
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const uint8_t* rowEnd = row + rowBytes;
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while (row != rowEnd) {
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Swap(row[0], row[2]);
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row += 4;
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}
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row += rowHole;
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}
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surf->Unmap();
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}
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static uint16_t
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PackRGB565(uint8_t r, uint8_t g, uint8_t b)
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{
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uint16_t pixel = ((r << 11) & 0xf800) |
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((g << 5) & 0x07e0) |
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((b ) & 0x001f);
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return pixel;
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}
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static void
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CopyDataSourceSurface(DataSourceSurface* aSource,
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DataSourceSurface* aDest)
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{
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// Don't worry too much about speed.
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MOZ_ASSERT(aSource->GetSize() == aDest->GetSize());
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MOZ_ASSERT(aSource->GetFormat() == SurfaceFormat::R8G8B8A8 ||
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aSource->GetFormat() == SurfaceFormat::R8G8B8X8 ||
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aSource->GetFormat() == SurfaceFormat::B8G8R8A8 ||
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aSource->GetFormat() == SurfaceFormat::B8G8R8X8);
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MOZ_ASSERT(aDest->GetFormat() == SurfaceFormat::R8G8B8A8 ||
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aDest->GetFormat() == SurfaceFormat::R8G8B8X8 ||
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aDest->GetFormat() == SurfaceFormat::B8G8R8A8 ||
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aDest->GetFormat() == SurfaceFormat::B8G8R8X8 ||
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aDest->GetFormat() == SurfaceFormat::R5G6B5);
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const bool isSrcBGR = aSource->GetFormat() == SurfaceFormat::B8G8R8A8 ||
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aSource->GetFormat() == SurfaceFormat::B8G8R8X8;
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const bool isDestBGR = aDest->GetFormat() == SurfaceFormat::B8G8R8A8 ||
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aDest->GetFormat() == SurfaceFormat::B8G8R8X8;
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const bool needsSwap02 = isSrcBGR != isDestBGR;
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const bool srcHasAlpha = aSource->GetFormat() == SurfaceFormat::R8G8B8A8 ||
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aSource->GetFormat() == SurfaceFormat::B8G8R8A8;
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const bool destHasAlpha = aDest->GetFormat() == SurfaceFormat::R8G8B8A8 ||
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aDest->GetFormat() == SurfaceFormat::B8G8R8A8;
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const bool needsAlphaMask = !srcHasAlpha && destHasAlpha;
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const bool needsConvertTo16Bits = aDest->GetFormat() == SurfaceFormat::R5G6B5;
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DataSourceSurface::MappedSurface srcMap;
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DataSourceSurface::MappedSurface destMap;
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MOZ_ALWAYS_TRUE( aSource->Map(DataSourceSurface::MapType::READ, &srcMap) );
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MOZ_ALWAYS_TRUE( aDest->Map(DataSourceSurface::MapType::WRITE, &destMap) );
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MOZ_ASSERT(srcMap.mStride >= 0);
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MOZ_ASSERT(destMap.mStride >= 0);
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const size_t srcBPP = BytesPerPixel(aSource->GetFormat());
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const size_t srcRowBytes = aSource->GetSize().width * srcBPP;
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const size_t srcRowHole = srcMap.mStride - srcRowBytes;
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const size_t destBPP = BytesPerPixel(aDest->GetFormat());
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const size_t destRowBytes = aDest->GetSize().width * destBPP;
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const size_t destRowHole = destMap.mStride - destRowBytes;
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uint8_t* srcRow = srcMap.mData;
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uint8_t* destRow = destMap.mData;
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const size_t rows = aSource->GetSize().height;
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for (size_t i = 0; i < rows; i++) {
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const uint8_t* srcRowEnd = srcRow + srcRowBytes;
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while (srcRow != srcRowEnd) {
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uint8_t d0 = needsSwap02 ? srcRow[2] : srcRow[0];
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uint8_t d1 = srcRow[1];
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uint8_t d2 = needsSwap02 ? srcRow[0] : srcRow[2];
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uint8_t d3 = needsAlphaMask ? 0xff : srcRow[3];
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if (needsConvertTo16Bits) {
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*(uint16_t*)destRow = PackRGB565(d0, d1, d2);
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} else {
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destRow[0] = d0;
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destRow[1] = d1;
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destRow[2] = d2;
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destRow[3] = d3;
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}
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srcRow += srcBPP;
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destRow += destBPP;
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}
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srcRow += srcRowHole;
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destRow += destRowHole;
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}
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aSource->Unmap();
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aDest->Unmap();
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}
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static int
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CalcRowStride(int width, int pixelSize, int alignment)
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{
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MOZ_ASSERT(alignment);
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int rowStride = width * pixelSize;
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if (rowStride % alignment) { // Extra at the end of the line?
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int alignmentCount = rowStride / alignment;
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rowStride = (alignmentCount+1) * alignment;
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}
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return rowStride;
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}
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static int
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GuessAlignment(int width, int pixelSize, int rowStride)
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{
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int alignment = 8; // Max GLES allows.
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while (CalcRowStride(width, pixelSize, alignment) != rowStride) {
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alignment /= 2;
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if (!alignment) {
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NS_WARNING("Bad alignment for GLES. Will use temp surf for readback.");
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return 0;
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}
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}
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return alignment;
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}
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void
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ReadPixelsIntoDataSurface(GLContext* gl, DataSourceSurface* dest)
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{
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gl->MakeCurrent();
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MOZ_ASSERT(dest->GetSize().width != 0);
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MOZ_ASSERT(dest->GetSize().height != 0);
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bool hasAlpha = dest->GetFormat() == SurfaceFormat::B8G8R8A8 ||
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dest->GetFormat() == SurfaceFormat::R8G8B8A8;
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int destPixelSize;
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GLenum destFormat;
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GLenum destType;
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switch (dest->GetFormat()) {
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case SurfaceFormat::B8G8R8A8:
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case SurfaceFormat::B8G8R8X8:
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// Needs host (little) endian ARGB.
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destFormat = LOCAL_GL_BGRA;
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destType = LOCAL_GL_UNSIGNED_INT_8_8_8_8_REV;
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break;
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case SurfaceFormat::R8G8B8A8:
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case SurfaceFormat::R8G8B8X8:
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// Needs host (little) endian ABGR.
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destFormat = LOCAL_GL_RGBA;
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destType = LOCAL_GL_UNSIGNED_BYTE;
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break;
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case SurfaceFormat::R5G6B5:
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destFormat = LOCAL_GL_RGB;
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destType = LOCAL_GL_UNSIGNED_SHORT_5_6_5_REV;
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break;
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default:
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MOZ_CRASH("Bad format.");
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}
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destPixelSize = BytesPerPixel(dest->GetFormat());
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MOZ_ASSERT(dest->GetSize().width * destPixelSize <= dest->Stride());
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GLenum readFormat = destFormat;
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GLenum readType = destType;
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bool needsTempSurf = !GetActualReadFormats(gl,
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destFormat, destType,
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readFormat, readType);
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RefPtr<DataSourceSurface> tempSurf;
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DataSourceSurface* readSurf = dest;
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int readAlignment = GuessAlignment(dest->GetSize().width,
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destPixelSize,
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dest->Stride());
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if (!readAlignment) {
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needsTempSurf = true;
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}
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if (needsTempSurf) {
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if (gl->DebugMode()) {
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NS_WARNING("Needing intermediary surface for ReadPixels. This will be slow!");
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}
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SurfaceFormat readFormatGFX;
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switch (readFormat) {
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case LOCAL_GL_RGBA: {
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readFormatGFX = hasAlpha ? SurfaceFormat::R8G8B8A8
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: SurfaceFormat::R8G8B8X8;
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break;
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}
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case LOCAL_GL_BGRA: {
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readFormatGFX = hasAlpha ? SurfaceFormat::B8G8R8A8
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: SurfaceFormat::B8G8R8X8;
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break;
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}
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case LOCAL_GL_RGB: {
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MOZ_ASSERT(destPixelSize == 2);
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MOZ_ASSERT(readType == LOCAL_GL_UNSIGNED_SHORT_5_6_5_REV);
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readFormatGFX = SurfaceFormat::R5G6B5;
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break;
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}
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default: {
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MOZ_CRASH("Bad read format.");
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}
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}
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switch (readType) {
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case LOCAL_GL_UNSIGNED_BYTE: {
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MOZ_ASSERT(readFormat == LOCAL_GL_RGBA);
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readAlignment = 1;
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break;
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}
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case LOCAL_GL_UNSIGNED_INT_8_8_8_8_REV: {
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MOZ_ASSERT(readFormat == LOCAL_GL_BGRA);
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readAlignment = 4;
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break;
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}
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case LOCAL_GL_UNSIGNED_SHORT_5_6_5_REV: {
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MOZ_ASSERT(readFormat == LOCAL_GL_RGB);
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readAlignment = 2;
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break;
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}
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default: {
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MOZ_CRASH("Bad read type.");
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}
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}
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int32_t stride = dest->GetSize().width * BytesPerPixel(readFormatGFX);
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tempSurf = Factory::CreateDataSourceSurfaceWithStride(dest->GetSize(),
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readFormatGFX,
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stride);
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if (NS_WARN_IF(!tempSurf)) {
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return;
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}
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readSurf = tempSurf;
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}
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MOZ_ASSERT(readAlignment);
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MOZ_ASSERT(reinterpret_cast<uintptr_t>(readSurf->GetData()) % readAlignment == 0);
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GLint currentPackAlignment = 0;
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gl->fGetIntegerv(LOCAL_GL_PACK_ALIGNMENT, ¤tPackAlignment);
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if (currentPackAlignment != readAlignment)
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gl->fPixelStorei(LOCAL_GL_PACK_ALIGNMENT, readAlignment);
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GLsizei width = dest->GetSize().width;
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GLsizei height = dest->GetSize().height;
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gl->fReadPixels(0, 0,
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width, height,
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readFormat, readType,
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readSurf->GetData());
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if (currentPackAlignment != readAlignment)
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gl->fPixelStorei(LOCAL_GL_PACK_ALIGNMENT, currentPackAlignment);
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if (readSurf != dest) {
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MOZ_ASSERT(readFormat == LOCAL_GL_RGBA);
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MOZ_ASSERT(readType == LOCAL_GL_UNSIGNED_BYTE);
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CopyDataSourceSurface(readSurf, dest);
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}
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// Check if GL is giving back 1.0 alpha for
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// RGBA reads to RGBA images from no-alpha buffers.
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#ifdef XP_MACOSX
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if (gl->WorkAroundDriverBugs() &&
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gl->Vendor() == gl::GLVendor::NVIDIA &&
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hasAlpha &&
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width && height)
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{
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GLint alphaBits = 0;
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gl->fGetIntegerv(LOCAL_GL_ALPHA_BITS, &alphaBits);
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if (!alphaBits) {
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const uint32_t alphaMask = gfxPackedPixelNoPreMultiply(0xff,0,0,0);
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|
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MOZ_ASSERT(dest->GetSize().width * destPixelSize == dest->Stride());
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uint32_t* itr = (uint32_t*)dest->GetData();
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uint32_t testPixel = *itr;
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if ((testPixel & alphaMask) != alphaMask) {
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// We need to set the alpha channel to 1.0 manually.
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uint32_t* itrEnd = itr + width*height; // Stride is guaranteed to be width*4.
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for (; itr != itrEnd; itr++) {
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*itr |= alphaMask;
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}
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}
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}
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}
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#endif
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}
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static TemporaryRef<DataSourceSurface>
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YInvertImageSurface(DataSourceSurface* aSurf)
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{
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RefPtr<DataSourceSurface> temp =
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Factory::CreateDataSourceSurfaceWithStride(aSurf->GetSize(),
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aSurf->GetFormat(),
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aSurf->Stride());
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if (NS_WARN_IF(!temp)) {
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return nullptr;
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}
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DataSourceSurface::MappedSurface map;
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if (!temp->Map(DataSourceSurface::MapType::WRITE, &map)) {
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return nullptr;
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}
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|
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RefPtr<DrawTarget> dt =
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Factory::CreateDrawTargetForData(BackendType::CAIRO,
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map.mData,
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temp->GetSize(),
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map.mStride,
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temp->GetFormat());
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if (!dt) {
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temp->Unmap();
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return nullptr;
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}
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|
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dt->SetTransform(Matrix::Translation(0.0, aSurf->GetSize().height) *
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Matrix::Scaling(1.0, -1.0));
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Rect rect(0, 0, aSurf->GetSize().width, aSurf->GetSize().height);
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dt->DrawSurface(aSurf, rect, rect, DrawSurfaceOptions(),
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DrawOptions(1.0, CompositionOp::OP_SOURCE, AntialiasMode::NONE));
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temp->Unmap();
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return temp.forget();
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}
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|
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|
TemporaryRef<DataSourceSurface>
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|
ReadBackSurface(GLContext* gl, GLuint aTexture, bool aYInvert, SurfaceFormat aFormat)
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|
{
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|
gl->MakeCurrent();
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|
gl->GuaranteeResolve();
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|
gl->fActiveTexture(LOCAL_GL_TEXTURE0);
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gl->fBindTexture(LOCAL_GL_TEXTURE_2D, aTexture);
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|
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IntSize size;
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gl->fGetTexLevelParameteriv(LOCAL_GL_TEXTURE_2D, 0, LOCAL_GL_TEXTURE_WIDTH, &size.width);
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gl->fGetTexLevelParameteriv(LOCAL_GL_TEXTURE_2D, 0, LOCAL_GL_TEXTURE_HEIGHT, &size.height);
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|
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|
RefPtr<DataSourceSurface> surf =
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Factory::CreateDataSourceSurfaceWithStride(size, SurfaceFormat::B8G8R8A8,
|
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GetAlignedStride<4>(size.width * BytesPerPixel(SurfaceFormat::B8G8R8A8)));
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|
|
|
if (NS_WARN_IF(!surf)) {
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|
return nullptr;
|
|
}
|
|
|
|
uint32_t currentPackAlignment = 0;
|
|
gl->fGetIntegerv(LOCAL_GL_PACK_ALIGNMENT, (GLint*)¤tPackAlignment);
|
|
if (currentPackAlignment != 4) {
|
|
gl->fPixelStorei(LOCAL_GL_PACK_ALIGNMENT, 4);
|
|
}
|
|
|
|
gl->fGetTexImage(LOCAL_GL_TEXTURE_2D, 0, LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_BYTE, surf->GetData());
|
|
|
|
if (currentPackAlignment != 4) {
|
|
gl->fPixelStorei(LOCAL_GL_PACK_ALIGNMENT, currentPackAlignment);
|
|
}
|
|
|
|
if (aFormat == SurfaceFormat::R8G8B8A8 || aFormat == SurfaceFormat::R8G8B8X8) {
|
|
SwapRAndBComponents(surf);
|
|
}
|
|
|
|
if (aYInvert) {
|
|
surf = YInvertImageSurface(surf);
|
|
}
|
|
|
|
return surf.forget();
|
|
}
|
|
|
|
#define CLEANUP_IF_GLERROR_OCCURRED(x) \
|
|
if (DidGLErrorOccur(x)) { \
|
|
isurf = nullptr; \
|
|
break; \
|
|
}
|
|
|
|
TemporaryRef<DataSourceSurface>
|
|
GLReadTexImageHelper::ReadTexImage(GLuint aTextureId,
|
|
GLenum aTextureTarget,
|
|
const gfx::IntSize& aSize,
|
|
/* ShaderConfigOGL.mFeature */ int aConfig,
|
|
bool aYInvert)
|
|
{
|
|
MOZ_ASSERT(aTextureTarget == LOCAL_GL_TEXTURE_2D ||
|
|
aTextureTarget == LOCAL_GL_TEXTURE_EXTERNAL ||
|
|
aTextureTarget == LOCAL_GL_TEXTURE_RECTANGLE_ARB);
|
|
|
|
mGL->MakeCurrent();
|
|
|
|
/* Allocate resulting image surface */
|
|
int32_t stride = aSize.width * BytesPerPixel(SurfaceFormat::R8G8B8A8);
|
|
RefPtr<DataSourceSurface> isurf =
|
|
Factory::CreateDataSourceSurfaceWithStride(aSize,
|
|
SurfaceFormat::R8G8B8A8,
|
|
stride);
|
|
if (NS_WARN_IF(isurf)) {
|
|
return nullptr;
|
|
}
|
|
|
|
GLint oldrb, oldfb, oldprog, oldTexUnit, oldTex;
|
|
GLuint rb, fb;
|
|
|
|
do {
|
|
mGL->fGetIntegerv(LOCAL_GL_RENDERBUFFER_BINDING, &oldrb);
|
|
mGL->fGetIntegerv(LOCAL_GL_FRAMEBUFFER_BINDING, &oldfb);
|
|
mGL->fGetIntegerv(LOCAL_GL_CURRENT_PROGRAM, &oldprog);
|
|
mGL->fGetIntegerv(LOCAL_GL_ACTIVE_TEXTURE, &oldTexUnit);
|
|
mGL->fActiveTexture(LOCAL_GL_TEXTURE0);
|
|
switch (aTextureTarget) {
|
|
case LOCAL_GL_TEXTURE_2D:
|
|
mGL->fGetIntegerv(LOCAL_GL_TEXTURE_BINDING_2D, &oldTex);
|
|
break;
|
|
case LOCAL_GL_TEXTURE_EXTERNAL:
|
|
mGL->fGetIntegerv(LOCAL_GL_TEXTURE_BINDING_EXTERNAL, &oldTex);
|
|
break;
|
|
case LOCAL_GL_TEXTURE_RECTANGLE:
|
|
mGL->fGetIntegerv(LOCAL_GL_TEXTURE_BINDING_RECTANGLE, &oldTex);
|
|
break;
|
|
default: /* Already checked above */
|
|
break;
|
|
}
|
|
|
|
ScopedGLState scopedScissorTestState(mGL, LOCAL_GL_SCISSOR_TEST, false);
|
|
ScopedGLState scopedBlendState(mGL, LOCAL_GL_BLEND, false);
|
|
ScopedViewportRect scopedViewportRect(mGL, 0, 0, aSize.width, aSize.height);
|
|
|
|
/* Setup renderbuffer */
|
|
mGL->fGenRenderbuffers(1, &rb);
|
|
mGL->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, rb);
|
|
|
|
GLenum rbInternalFormat =
|
|
mGL->IsGLES()
|
|
? (mGL->IsExtensionSupported(GLContext::OES_rgb8_rgba8) ? LOCAL_GL_RGBA8 : LOCAL_GL_RGBA4)
|
|
: LOCAL_GL_RGBA;
|
|
mGL->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, rbInternalFormat, aSize.width, aSize.height);
|
|
CLEANUP_IF_GLERROR_OCCURRED("when binding and creating renderbuffer");
|
|
|
|
/* Setup framebuffer */
|
|
mGL->fGenFramebuffers(1, &fb);
|
|
mGL->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, fb);
|
|
mGL->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_COLOR_ATTACHMENT0,
|
|
LOCAL_GL_RENDERBUFFER, rb);
|
|
CLEANUP_IF_GLERROR_OCCURRED("when binding and creating framebuffer");
|
|
|
|
MOZ_ASSERT(mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER) == LOCAL_GL_FRAMEBUFFER_COMPLETE);
|
|
|
|
/* Setup vertex and fragment shader */
|
|
GLuint program = TextureImageProgramFor(aTextureTarget, aConfig);
|
|
MOZ_ASSERT(program);
|
|
|
|
mGL->fUseProgram(program);
|
|
CLEANUP_IF_GLERROR_OCCURRED("when using program");
|
|
mGL->fUniform1i(mGL->fGetUniformLocation(program, "uTexture"), 0);
|
|
CLEANUP_IF_GLERROR_OCCURRED("when setting uniform location");
|
|
|
|
/* Setup quad geometry */
|
|
mGL->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
|
|
|
|
float w = (aTextureTarget == LOCAL_GL_TEXTURE_RECTANGLE) ? (float) aSize.width : 1.0f;
|
|
float h = (aTextureTarget == LOCAL_GL_TEXTURE_RECTANGLE) ? (float) aSize.height : 1.0f;
|
|
|
|
const float
|
|
vertexArray[4*2] = {
|
|
-1.0f, -1.0f,
|
|
1.0f, -1.0f,
|
|
-1.0f, 1.0f,
|
|
1.0f, 1.0f
|
|
};
|
|
ScopedVertexAttribPointer autoAttrib0(mGL, 0, 2, LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0, 0, vertexArray);
|
|
|
|
const float u0 = 0.0f;
|
|
const float u1 = w;
|
|
const float v0 = aYInvert ? h : 0.0f;
|
|
const float v1 = aYInvert ? 0.0f : h;
|
|
const float texCoordArray[8] = { u0, v0,
|
|
u1, v0,
|
|
u0, v1,
|
|
u1, v1 };
|
|
ScopedVertexAttribPointer autoAttrib1(mGL, 1, 2, LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0, 0, texCoordArray);
|
|
|
|
/* Bind the texture */
|
|
if (aTextureId) {
|
|
mGL->fBindTexture(aTextureTarget, aTextureId);
|
|
CLEANUP_IF_GLERROR_OCCURRED("when binding texture");
|
|
}
|
|
|
|
/* Draw quad */
|
|
mGL->fClearColor(1.0f, 0.0f, 1.0f, 1.0f);
|
|
mGL->fClear(LOCAL_GL_COLOR_BUFFER_BIT);
|
|
CLEANUP_IF_GLERROR_OCCURRED("when clearing color buffer");
|
|
|
|
mGL->fDrawArrays(LOCAL_GL_TRIANGLE_STRIP, 0, 4);
|
|
CLEANUP_IF_GLERROR_OCCURRED("when drawing texture");
|
|
|
|
/* Read-back draw results */
|
|
ReadPixelsIntoDataSurface(mGL, isurf);
|
|
CLEANUP_IF_GLERROR_OCCURRED("when reading pixels into surface");
|
|
} while (false);
|
|
|
|
/* Restore GL state */
|
|
mGL->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, oldrb);
|
|
mGL->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, oldfb);
|
|
mGL->fUseProgram(oldprog);
|
|
|
|
// note that deleting 0 has no effect in any of these calls
|
|
mGL->fDeleteRenderbuffers(1, &rb);
|
|
mGL->fDeleteFramebuffers(1, &fb);
|
|
|
|
if (aTextureId)
|
|
mGL->fBindTexture(aTextureTarget, oldTex);
|
|
|
|
if (oldTexUnit != LOCAL_GL_TEXTURE0)
|
|
mGL->fActiveTexture(oldTexUnit);
|
|
|
|
return isurf.forget();
|
|
}
|
|
|
|
#undef CLEANUP_IF_GLERROR_OCCURRED
|
|
|
|
}
|
|
}
|