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
| // Functions shared by OffscreenContext[platform].cc
// #include this directly after definition of struct OffscreenContext.
/*!
Capture framebuffer from OpenGL and write it to the given ostream.
Called by save_framebuffer() from platform-specific code.
*/
static bool save_framebuffer_common(OffscreenContext *ctx, FILE * output)
{
if (!ctx) return false;
int samplesPerPixel = 3; // R, G, B
unsigned char pixels[ctx->width*ctx->height*samplesPerPixel];
glReadPixels (0, 0, ctx->width, ctx->height,
GL_RGB, GL_UNSIGNED_BYTE, pixels);
fprintf (output, "P6 %d %d 255\n", ctx->width, ctx->height);
fwrite (pixels, sizeof(unsigned char),
ctx->width*ctx->height*samplesPerPixel, output);
return true;
}
// Called by get_framebuffer_pixels() from platform-specific code.
static unsigned char * get_framebuffer_pixels_common (OffscreenContext *ctx)
{
if (!ctx) return NULL;
glReadPixels (0, 0, ctx->width, ctx->height,
GL_RGBA, GL_UNSIGNED_BYTE, ctx->image);
return ctx->image;
}
// Called by get_framebuffer_depth() from platform-specific code.
static unsigned int * get_framebuffer_depth_common (OffscreenContext *ctx)
{
if (!ctx) return NULL;
if (!ctx->depth) {
ctx->depth = malloc (sizeof(unsigned int)*ctx->width*ctx->height);
glGenTextures (1, &ctx->depth_texture);
glBindTexture (GL_TEXTURE_2D, ctx->depth_texture);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D (GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
ctx->width, ctx->height,
0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, 0);
}
glCopyTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, 0, 0, ctx->width, ctx->height);
glGetTexImage (GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT,
ctx->depth);
return ctx->depth;
}
// Called by create_offscreen_context() from platform-specific code.
static OffscreenContext *create_offscreen_context_common(OffscreenContext *ctx)
{
if (!ctx) return NULL;
GLenum err = glewInit(); // must come after Context creation and before FBO c$
if (GLEW_OK != err) {
fprintf (stderr, "Unable to init GLEW: %s\n", glewGetErrorString(err));
return NULL;
}
ctx->fbo = fbo_new();
if (!fbo_init(ctx->fbo, ctx->width, ctx->height)) {
return NULL;
}
ctx->image = malloc (sizeof(unsigned char)*ctx->width*ctx->height*4);
ctx->depth = NULL;
return ctx;
}
// Called by teardown_offscreen_context() from platform-specific code.
static bool teardown_offscreen_context_common(OffscreenContext *ctx)
{
if (!ctx) return false;
free (ctx->image);
if (ctx->depth) {
glDeleteTextures (1, &ctx->depth_texture);
free (ctx->depth);
}
return true;
}
|
