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
|
/*
Copyright (c) 2016, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "common.h"
#include <stdbool.h>
#include <stdio.h>
#include <png.h>
#include <GL/glew.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>
static void savePNG(int width, int height, const char *output_dir) {
uint8_t pixels[width*height*4];
glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, pixels);
char filename[strlen(output_dir) + 20];
snprintf(filename, sizeof(filename), "%s/%010u.png", output_dir, (unsigned)current_time);
FILE *f = fopen(filename, "wb");
if (!f) {
fprintf(stderr, "unable to open PNG file\n");
exit(1);
}
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
fprintf(stderr, "unable to open PNG file\n");
exit(1);
}
png_set_swap_alpha(png_ptr);
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
fprintf(stderr, "unable to create PNG info struct\n");
exit(1);
}
if (setjmp(png_jmpbuf(png_ptr))) {
fprintf(stderr, "unable to write PNG file\n");
exit(1);
}
png_init_io(png_ptr, f);
png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
uint8_t *row_pointers[height];
for (size_t i = 0; i < height; i++)
row_pointers[i] = &pixels[4*(height-1-i)*width];
png_set_rows(png_ptr, info_ptr, row_pointers);
png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(f);
}
int main(int argc, char *argv[]) {
if (argc != 3) {
fprintf(stderr, "Usage: glslwrite <shader> <output directory>\n");
exit(1);
}
SDL_Init(SDL_INIT_VIDEO);
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
SDL_Window *window = SDL_CreateWindow("glslwrite", 0, 0, 800, 800, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
SDL_GLContext ctx = SDL_GL_CreateContext(window);
filename = argv[1];
init();
load();
while (true) {
SDL_Event e;
while (SDL_PollEvent(&e)) {
switch (e.type) {
case SDL_KEYDOWN:
switch (e.key.keysym.sym) {
case SDLK_ESCAPE:
goto quit;
}
break;
case SDL_QUIT:
goto quit;
}
}
int width, height;
SDL_GetWindowSize(window, &width, &height);
render(width, height);
SDL_GL_SwapWindow(window);
savePNG(width, height, argv[2]);
current_time += 20;
}
quit:
SDL_GL_DeleteContext(ctx);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
|
