Does GlyphKeeper+OpenGL work

Does GlyphKeeper+OpenGL work < 32bit depth ?

kikabo

Member #3,679

July 2003

Maybe the topic says it all, I tried my project on linux the other day under a driver that didn't support 32bit colour depths, most things worked, one of the things that didn't was any text rendered with GK.

I tried the same thing on windows in 16bit with the same results, is this a known problem?

I'm guessing I'm just doing something wrong because I assume there would be the same problem in OpenLayer?

Here's a test that doesn't work for me in < 32bit, I know I'm misusing makeacol but I don't think that matters, the alpha whould still be 255.???

1#include <allegro.h>
2#include <alleggl.h>
3#define GLYPH_TARGET GLYPH_TARGET_ALLEGGL
4#include <glyph.h>
5 
6int main()
7{
8   allegro_init();
9   install_allegro_gl();
10   install_timer();
11   install_keyboard();
12  
13   allegro_gl_clear_settings();
14   allegro_gl_set(AGL_COLOR_DEPTH, 32);
15   allegro_gl_set(AGL_DOUBLEBUFFER, 1);
16   allegro_gl_set(AGL_SUGGEST, AGL_DOUBLEBUFFER | AGL_COLOR_DEPTH | AGL_WINDOWED);
17   if (set_gfx_mode(GFX_OPENGL_WINDOWED, 800, 600, 0, 0)) {
18    allegro_message("Error initializing OpenGL!\n");
19    return -1;
20   }
21   glClearColor (0, 0, 0, 0);
22 
23   char* fontfile = "Vera.TTF";
24   GLYPH_FACE* face;
25   GLYPH_REND* rend;
26   GLYPH_TEXTURE *texture;
27 
28   face = gk_load_face_from_file(fontfile,0);
29   if (!face) { allegro_message("Can't load font from \"%s\"\n",fontfile); exit(1); }
30 
31   rend = gk_create_renderer(face,0);
32   if (!rend) { allegro_message("Can't create renderer"); exit(1); }
33 
34   gk_rend_set_size_pixels(rend,30,30);
35 
36   texture = gk_create_texture( rend, 32, 96 );
37 
38 
39   while (!key[KEY_ESC])
40   {
41      glClear(GL_COLOR_BUFFER_BIT);
42 
43      gk_rend_set_text_alpha_color( rend, makeacol(0,255,255,255) ); // Note B G R A
44      gk_render_line_gl_utf8(texture, "Hello World",100,100);
45 
46 
47      gk_rend_set_text_alpha_color( rend, makeacol(0,255,0,255) ); // Note B G R A
48      gk_render_line_gl_utf8(texture, "Hello World",100,200);
49 
50      allegro_gl_flip(); 
51   }
52 
53   return 0;
54}
55END_OF_MAIN();

edit:
~~is it just that glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ); can't work with no alpha channel ?~~ that's source not dest, nevermind