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
|
#include <mbgl/shader/shader.hpp>
#include <mbgl/platform/gl.hpp>
#include <mbgl/util/timer.hpp>
#include <mbgl/platform/log.hpp>
#include <cstring>
#include <cstdlib>
using namespace mbgl;
Shader::Shader(const GLchar *vertSource, const GLchar *fragSource)
: valid(false),
program(0) {
util::timer timer("shader compilation", Event::Shader);
GLuint vertShader;
if (!compileShader(&vertShader, GL_VERTEX_SHADER, vertSource)) {
Log::Error(Event::Shader, "Vertex shader failed to compile: %s", vertSource);
return;
}
GLuint fragShader;
if (!compileShader(&fragShader, GL_FRAGMENT_SHADER, fragSource)) {
Log::Error(Event::Shader, "Fragment shader failed to compile: %s", fragSource);
return;
}
program = glCreateProgram();
// Attach shaders
glAttachShader(program, vertShader);
glAttachShader(program, fragShader);
{
// Link program
GLint status;
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &status);
if (status == 0) {
GLint logLength;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0) {
GLchar *log = (GLchar *)malloc(logLength);
glGetProgramInfoLog(program, logLength, &logLength, log);
Log::Error(Event::Shader, "Program failed to link: %s", log);
free(log);
}
glDeleteShader(vertShader);
vertShader = 0;
glDeleteShader(fragShader);
fragShader = 0;
glDeleteProgram(program);
program = 0;
return;
}
}
{
// Validate program
GLint status;
glValidateProgram(program);
glGetProgramiv(program, GL_VALIDATE_STATUS, &status);
if (status == 0) {
GLint logLength;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0) {
GLchar *log = (GLchar *)malloc(logLength);
glGetProgramInfoLog(program, logLength, &logLength, log);
Log::Error(Event::Shader, "Program failed to validate: %s", log);
free(log);
}
glDeleteShader(vertShader);
vertShader = 0;
glDeleteShader(fragShader);
fragShader = 0;
glDeleteProgram(program);
program = 0;
}
}
// Remove the compiled shaders; they are now part of the program.
glDetachShader(program, vertShader);
glDeleteShader(vertShader);
glDetachShader(program, fragShader);
glDeleteShader(fragShader);
valid = true;
}
bool Shader::compileShader(GLuint *shader, GLenum type, const GLchar *source) {
GLint status;
*shader = glCreateShader(type);
const GLchar *strings[] = { source };
const GLint lengths[] = { (GLint)strlen(source) };
glShaderSource(*shader, 1, strings, lengths);
glCompileShader(*shader);
glGetShaderiv(*shader, GL_COMPILE_STATUS, &status);
if (status == 0) {
GLint logLength;
glGetShaderiv(*shader, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0) {
GLchar *log = (GLchar *)malloc(logLength);
glGetShaderInfoLog(*shader, logLength, &logLength, log);
Log::Error(Event::Shader, "Shader failed to compile: %s", log);
free(log);
}
glDeleteShader(*shader);
*shader = 0;
return false;
}
return true;
}
void Shader::setMatrix(const std::array<float, 16>& newMatrix) {
if (matrix != newMatrix) {
glUniformMatrix4fv(u_matrix, 1, GL_FALSE, newMatrix.data());
matrix = newMatrix;
}
}
Shader::~Shader() {
if (program) {
glDeleteProgram(program);
program = 0;
valid = false;
}
}
|
