1 // Copyright 2014 Citra Emulator Project
2 // Licensed under GPLv2 or any later version
3 // Refer to the license.txt file included.
4
5 #include <array>
6 #include <string>
7 #include <vector>
8 #include <glad/glad.h>
9 #include "common/assert.h"
10 #include "common/logging/log.h"
11 #include "video_core/renderer_opengl/gl_shader_util.h"
12 #include "video_core/renderer_opengl/gl_vars.h"
13
14 namespace OpenGL {
15
LoadShader(const char * source,GLenum type)16 GLuint LoadShader(const char* source, GLenum type) {
17 const std::string version = GLES ? R"(#version 320 es
18
19 #define CITRA_GLES
20
21 #if defined(GL_ANDROID_extension_pack_es31a)
22 #extension GL_ANDROID_extension_pack_es31a : enable
23 #endif // defined(GL_ANDROID_extension_pack_es31a)
24
25 #if defined(GL_EXT_clip_cull_distance)
26 #extension GL_EXT_clip_cull_distance : enable
27 #endif // defined(GL_EXT_clip_cull_distance)
28 )"
29 : "#version 330\n";
30
31 const char* debug_type;
32 switch (type) {
33 case GL_VERTEX_SHADER:
34 debug_type = "vertex";
35 break;
36 case GL_GEOMETRY_SHADER:
37 debug_type = "geometry";
38 break;
39 case GL_FRAGMENT_SHADER:
40 debug_type = "fragment";
41 break;
42 default:
43 UNREACHABLE();
44 }
45
46 std::array<const char*, 2> src_arr{version.data(), source};
47 GLuint shader_id = glCreateShader(type);
48 glShaderSource(shader_id, static_cast<GLsizei>(src_arr.size()), src_arr.data(), nullptr);
49 LOG_DEBUG(Render_OpenGL, "Compiling {} shader...", debug_type);
50 glCompileShader(shader_id);
51
52 GLint result = GL_FALSE;
53 GLint info_log_length;
54 glGetShaderiv(shader_id, GL_COMPILE_STATUS, &result);
55 glGetShaderiv(shader_id, GL_INFO_LOG_LENGTH, &info_log_length);
56
57 if (info_log_length > 1) {
58 std::vector<char> shader_error(info_log_length);
59 glGetShaderInfoLog(shader_id, info_log_length, nullptr, &shader_error[0]);
60 if (result == GL_TRUE) {
61 LOG_DEBUG(Render_OpenGL, "{}", &shader_error[0]);
62 } else {
63 LOG_ERROR(Render_OpenGL, "Error compiling {} shader:\n{}", debug_type,
64 &shader_error[0]);
65 LOG_ERROR(Render_OpenGL, "Shader source code:\n{}{}", src_arr[0], src_arr[1]);
66 }
67 }
68 return shader_id;
69 }
70
LoadProgram(bool separable_program,const std::vector<GLuint> & shaders)71 GLuint LoadProgram(bool separable_program, const std::vector<GLuint>& shaders) {
72 // Link the program
73 LOG_DEBUG(Render_OpenGL, "Linking program...");
74
75 GLuint program_id = glCreateProgram();
76
77 for (GLuint shader : shaders) {
78 if (shader != 0) {
79 glAttachShader(program_id, shader);
80 }
81 }
82
83 if (separable_program) {
84 glProgramParameteri(program_id, GL_PROGRAM_SEPARABLE, GL_TRUE);
85 }
86
87 glLinkProgram(program_id);
88
89 // Check the program
90 GLint result = GL_FALSE;
91 GLint info_log_length;
92 glGetProgramiv(program_id, GL_LINK_STATUS, &result);
93 glGetProgramiv(program_id, GL_INFO_LOG_LENGTH, &info_log_length);
94
95 if (info_log_length > 1) {
96 std::vector<char> program_error(info_log_length);
97 glGetProgramInfoLog(program_id, info_log_length, nullptr, &program_error[0]);
98 if (result == GL_TRUE) {
99 LOG_DEBUG(Render_OpenGL, "{}", &program_error[0]);
100 } else {
101 LOG_ERROR(Render_OpenGL, "Error linking shader:\n{}", &program_error[0]);
102 }
103 }
104
105 ASSERT_MSG(result == GL_TRUE, "Shader not linked");
106
107 for (GLuint shader : shaders) {
108 if (shader != 0) {
109 glDetachShader(program_id, shader);
110 }
111 }
112
113 return program_id;
114 }
115
116 } // namespace OpenGL
117