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
|
/*
* Copyright (C) 2018-2020 - Vito Caputo - <vcaputo@pengaru.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdlib.h>
#include "glad.h"
#include "macros.h"
#include "shader.h"
typedef struct shader_t {
unsigned program, refcnt;
unsigned n_uniforms, n_attributes;
int *uniforms, *attributes;
int locations[];
} shader_t;
unsigned int shader_pair_new_bare(const char *vs_src, const char *fs_src)
{
unsigned int vertex_shader, fragment_shader, shader;
int shader_success;
char shader_info[4096];
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, &vs_src, NULL);
glCompileShader(vertex_shader);
glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &shader_success);
if (!shader_success) {
glGetShaderInfoLog(vertex_shader, sizeof(shader_info), NULL, shader_info);
fatal_if(1, "Error compiling vertex shader: \"%s\"", shader_info);
}
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, &fs_src, NULL);
glCompileShader(fragment_shader);
glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &shader_success);
if (!shader_success) {
glGetShaderInfoLog(fragment_shader, sizeof(shader_info), NULL, shader_info);
fatal_if(1, "Error compiling fragment shader: \"%s\"", shader_info);
}
shader = glCreateProgram();
glAttachShader(shader, vertex_shader);
glAttachShader(shader, fragment_shader);
glLinkProgram(shader);
glGetProgramiv(shader, GL_LINK_STATUS, &shader_success);
if (!shader_success) {
glGetProgramInfoLog(shader, sizeof(shader_info), NULL, shader_info);
fatal_if(1, "Error linking shader program: \"%s\"", shader_info);
}
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
return shader;
}
shader_t * shader_pair_new(const char *vs_src, const char *fs_src, unsigned n_uniforms, const char **uniforms, unsigned n_attributes, const char **attributes)
{
shader_t *shader;
assert(vs_src);
assert(fs_src);
assert(uniforms || !n_uniforms);
assert(attributes || !n_attributes);
shader = calloc(1, sizeof(shader_t) + (n_uniforms + n_attributes) * sizeof(int));
fatal_if(!shader, "Unable to allocate shader");
shader->program = shader_pair_new_bare(vs_src, fs_src);
shader->refcnt++;
shader->n_uniforms = n_uniforms;
shader->n_attributes = n_attributes;
shader->uniforms = shader->locations;
shader->attributes = &shader->locations[n_uniforms];
for (unsigned i = 0; i < n_uniforms; i++)
shader->uniforms[i] = glGetUniformLocation(shader->program, uniforms[i]);
for (unsigned i = 0; i < n_attributes; i++)
shader->attributes[i] = glGetAttribLocation(shader->program, attributes[i]);
return shader;
}
void shader_ref(shader_t *shader)
{
assert(shader);
shader->refcnt++;
}
shader_t * shader_free(shader_t *shader)
{
assert(shader);
shader->refcnt--;
if (shader->refcnt > 0)
return shader;
glDeleteProgram(shader->program);
free(shader);
return NULL;
}
void shader_use(shader_t *shader, unsigned *res_n_uniforms, int **res_uniforms, unsigned *res_n_attributes, int **res_attributes)
{
assert(shader);
if (res_n_uniforms)
*res_n_uniforms = shader->n_uniforms;
if (res_uniforms)
*res_uniforms = shader->uniforms;
if (res_n_attributes)
*res_n_attributes = shader->n_attributes;
if (res_attributes)
*res_attributes = shader->attributes;
glUseProgram(shader->program);
}
|
