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/*
* Copyright 2011-2022 Blender Foundation
*
* 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 "app/opengl/shader.h"
#include "util/log.h"
#include "util/string.h"
#include <GL/glew.h>
CCL_NAMESPACE_BEGIN
/* --------------------------------------------------------------------
* OpenGLShader.
*/
static const char *VERTEX_SHADER =
"#version 330\n"
"uniform vec2 fullscreen;\n"
"in vec2 texCoord;\n"
"in vec2 pos;\n"
"out vec2 texCoord_interp;\n"
"\n"
"vec2 normalize_coordinates()\n"
"{\n"
" return (vec2(2.0) * (pos / fullscreen)) - vec2(1.0);\n"
"}\n"
"\n"
"void main()\n"
"{\n"
" gl_Position = vec4(normalize_coordinates(), 0.0, 1.0);\n"
" texCoord_interp = texCoord;\n"
"}\n\0";
static const char *FRAGMENT_SHADER =
"#version 330\n"
"uniform sampler2D image_texture;\n"
"in vec2 texCoord_interp;\n"
"out vec4 fragColor;\n"
"\n"
"void main()\n"
"{\n"
" vec4 rgba = texture(image_texture, texCoord_interp);\n"
/* Harcoded Rec.709 gamma, should use OpenColorIO eventually. */
" fragColor = pow(rgba, vec4(0.45, 0.45, 0.45, 1.0));\n"
"}\n\0";
static void shader_print_errors(const char *task, const char *log, const char *code)
{
LOG(ERROR) << "Shader: " << task << " error:";
LOG(ERROR) << "===== shader string ====";
stringstream stream(code);
string partial;
int line = 1;
while (getline(stream, partial, '\n')) {
if (line < 10) {
LOG(ERROR) << " " << line << " " << partial;
}
else {
LOG(ERROR) << line << " " << partial;
}
line++;
}
LOG(ERROR) << log;
}
static int compile_shader_program(void)
{
const struct Shader {
const char *source;
const GLenum type;
} shaders[2] = {{VERTEX_SHADER, GL_VERTEX_SHADER}, {FRAGMENT_SHADER, GL_FRAGMENT_SHADER}};
const GLuint program = glCreateProgram();
for (int i = 0; i < 2; i++) {
const GLuint shader = glCreateShader(shaders[i].type);
string source_str = shaders[i].source;
const char *c_str = source_str.c_str();
glShaderSource(shader, 1, &c_str, NULL);
glCompileShader(shader);
GLint compile_status;
glGetShaderiv(shader, GL_COMPILE_STATUS, &compile_status);
if (!compile_status) {
GLchar log[5000];
GLsizei length = 0;
glGetShaderInfoLog(shader, sizeof(log), &length, log);
shader_print_errors("compile", log, c_str);
return 0;
}
glAttachShader(program, shader);
}
/* Link output. */
glBindFragDataLocation(program, 0, "fragColor");
/* Link and error check. */
glLinkProgram(program);
GLint link_status;
glGetProgramiv(program, GL_LINK_STATUS, &link_status);
if (!link_status) {
GLchar log[5000];
GLsizei length = 0;
glGetShaderInfoLog(program, sizeof(log), &length, log);
shader_print_errors("linking", log, VERTEX_SHADER);
shader_print_errors("linking", log, FRAGMENT_SHADER);
return 0;
}
return program;
}
int OpenGLShader::get_position_attrib_location()
{
if (position_attribute_location_ == -1) {
const uint shader_program = get_shader_program();
position_attribute_location_ = glGetAttribLocation(shader_program, position_attribute_name);
}
return position_attribute_location_;
}
int OpenGLShader::get_tex_coord_attrib_location()
{
if (tex_coord_attribute_location_ == -1) {
const uint shader_program = get_shader_program();
tex_coord_attribute_location_ = glGetAttribLocation(shader_program, tex_coord_attribute_name);
}
return tex_coord_attribute_location_;
}
void OpenGLShader::bind(int width, int height)
{
create_shader_if_needed();
if (!shader_program_) {
return;
}
glUseProgram(shader_program_);
glUniform1i(image_texture_location_, 0);
glUniform2f(fullscreen_location_, width, height);
}
void OpenGLShader::unbind()
{
}
uint OpenGLShader::get_shader_program()
{
return shader_program_;
}
void OpenGLShader::create_shader_if_needed()
{
if (shader_program_ || shader_compile_attempted_) {
return;
}
shader_compile_attempted_ = true;
shader_program_ = compile_shader_program();
if (!shader_program_) {
return;
}
glUseProgram(shader_program_);
image_texture_location_ = glGetUniformLocation(shader_program_, "image_texture");
if (image_texture_location_ < 0) {
LOG(ERROR) << "Shader doesn't contain the 'image_texture' uniform.";
destroy_shader();
return;
}
fullscreen_location_ = glGetUniformLocation(shader_program_, "fullscreen");
if (fullscreen_location_ < 0) {
LOG(ERROR) << "Shader doesn't contain the 'fullscreen' uniform.";
destroy_shader();
return;
}
}
void OpenGLShader::destroy_shader()
{
glDeleteProgram(shader_program_);
shader_program_ = 0;
}
CCL_NAMESPACE_END
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