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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gl/yuv_to_rgb_converter.h"
#include "base/strings/stringize_macros.h"
#include "base/strings/stringprintf.h"
#include "ui/gl/gl_helper.h"
#include "ui/gl/gl_version_info.h"
#include "ui/gl/scoped_api.h"
#include "ui/gl/scoped_binders.h"
namespace gl {
namespace {
const char kVertexHeaderCompatiblityProfile[] =
"#version 110\n"
"#define ATTRIBUTE attribute\n"
"#define VARYING varying\n";
const char kVertexHeaderCoreProfile[] =
"#version 150\n"
"#define ATTRIBUTE in\n"
"#define VARYING out\n";
const char kFragmentHeaderCompatiblityProfile[] =
"#version 110\n"
"#extension GL_ARB_texture_rectangle : require\n"
"#define VARYING varying\n"
"#define FRAGCOLOR gl_FragColor\n"
"#define TEX texture2DRect\n";
const char kFragmentHeaderCoreProfile[] =
"#version 150\n"
"#define VARYING in\n"
"#define TEX texture\n"
"#define FRAGCOLOR frag_color\n"
"out vec4 FRAGCOLOR;\n";
// clang-format off
const char kVertexShader[] =
STRINGIZE(
ATTRIBUTE vec2 a_position;
uniform vec2 a_texScale;
VARYING vec2 v_texCoord;
void main() {
gl_Position = vec4(a_position.x, a_position.y, 0.0, 1.0);
v_texCoord = (a_position + vec2(1.0, 1.0)) * 0.5 * a_texScale;
}
);
const char kFragmentShader[] =
STRINGIZE(
uniform sampler2DRect a_y_texture;
uniform sampler2DRect a_uv_texture;
VARYING vec2 v_texCoord;
void main() {
vec3 yuv_adj = vec3(-0.0625, -0.5, -0.5);
mat3 yuv_matrix = mat3(vec3(1.164, 1.164, 1.164),
vec3(0.0, -.391, 2.018),
vec3(1.596, -.813, 0.0));
vec3 yuv = vec3(
TEX(a_y_texture, v_texCoord).r,
TEX(a_uv_texture, v_texCoord * 0.5).rg);
FRAGCOLOR = vec4(yuv_matrix * (yuv + yuv_adj), 1.0);
}
);
// clang-format on
} // namespace
YUVToRGBConverter::YUVToRGBConverter(const GLVersionInfo& gl_version_info) {
bool use_core_profile = gl_version_info.is_desktop_core_profile;
ScopedSetGLToRealGLApi scoped_set_gl_api;
glGenFramebuffersEXT(1, &framebuffer_);
vertex_buffer_ = GLHelper::SetupQuadVertexBuffer();
vertex_shader_ = GLHelper::LoadShader(
GL_VERTEX_SHADER,
base::StringPrintf("%s\n%s",
use_core_profile ? kVertexHeaderCoreProfile
: kVertexHeaderCompatiblityProfile,
kVertexShader)
.c_str());
fragment_shader_ = GLHelper::LoadShader(
GL_FRAGMENT_SHADER,
base::StringPrintf("%s\n%s",
use_core_profile ? kFragmentHeaderCoreProfile
: kFragmentHeaderCompatiblityProfile,
kFragmentShader)
.c_str());
program_ = GLHelper::SetupProgram(vertex_shader_, fragment_shader_);
ScopedUseProgram use_program(program_);
size_location_ = glGetUniformLocation(program_, "a_texScale");
DCHECK_NE(-1, size_location_);
int y_sampler_location = glGetUniformLocation(program_, "a_y_texture");
DCHECK_NE(-1, y_sampler_location);
int uv_sampler_location = glGetUniformLocation(program_, "a_uv_texture");
DCHECK_NE(-1, uv_sampler_location);
glGenTextures(1, &y_texture_);
glGenTextures(1, &uv_texture_);
glUniform1i(y_sampler_location, 0);
glUniform1i(uv_sampler_location, 1);
}
YUVToRGBConverter::~YUVToRGBConverter() {
ScopedSetGLToRealGLApi scoped_set_gl_api;
glDeleteTextures(1, &y_texture_);
glDeleteTextures(1, &uv_texture_);
glDeleteProgram(program_);
glDeleteShader(vertex_shader_);
glDeleteShader(fragment_shader_);
glDeleteBuffersARB(1, &vertex_buffer_);
glDeleteFramebuffersEXT(1, &framebuffer_);
}
void YUVToRGBConverter::CopyYUV420ToRGB(unsigned target,
const gfx::Size& size,
unsigned rgb_texture) {
ScopedSetGLToRealGLApi scoped_set_gl_api;
// Note that state restoration is done explicitly instead of scoped binders to
// avoid https://crbug.com/601729.
GLint old_active_texture = -1;
glGetIntegerv(GL_ACTIVE_TEXTURE, &old_active_texture);
GLint old_texture0_binding = -1;
glActiveTexture(GL_TEXTURE0);
glGetIntegerv(GL_TEXTURE_BINDING_RECTANGLE_ARB, &old_texture0_binding);
GLint old_texture1_binding = -1;
glActiveTexture(GL_TEXTURE1);
glGetIntegerv(GL_TEXTURE_BINDING_RECTANGLE_ARB, &old_texture1_binding);
// Allocate the rgb texture.
glBindTexture(target, rgb_texture);
glTexImage2D(target, 0, GL_RGB, size.width(), size.height(),
0, GL_RGB, GL_UNSIGNED_BYTE, nullptr);
// Set up and issue the draw call.
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, y_texture_);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, uv_texture_);
ScopedFramebufferBinder framebuffer_binder(framebuffer_);
ScopedViewport viewport(0, 0, size.width(), size.height());
glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
target, rgb_texture, 0);
DCHECK_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
glCheckFramebufferStatusEXT(GL_FRAMEBUFFER));
ScopedUseProgram use_program(program_);
glUniform2f(size_location_, size.width(), size.height());
GLHelper::DrawQuad(vertex_buffer_);
// Restore previous state.
glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
target, 0, 0);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, old_texture0_binding);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, old_texture1_binding);
glActiveTexture(old_active_texture);
}
} // namespace gl
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