1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#include "app/opengl/shader.h"
#include "util/log.h"
#include "util/string.h"
#include <epoxy/gl.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
|
