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| GL Target Bitmaps Don't like Mipmap Flag But D3D is fine |
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jmasterx
Member #11,410
October 2009
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There was a bug in my game since upgrading to I think 5.1.5 or 5.1.6 Any target bitmap I made, using GL, would render pure white. In D3D all was fine. I tracked it down to the fact that all my bitmaps are created with the mipmap flag on. I turned it off and it fixed it. Here is a minimum example of the problem: 1#include <allegro5/allegro.h>
2#include <allegro5/allegro_font.h>
3#include <allegro5/allegro_image.h>
4#include <allegro5/allegro_primitives.h>
5#include <stdio.h>
6#include <stdarg.h>
7#include <math.h>
8
9
10const int W = 300, H = 300; /* Size of target bitmap. */
11const int RW = 50, RH = 50; /* Size of rectangle we draw to it. */
12ALLEGRO_DISPLAY *display;
13ALLEGRO_BITMAP *target; /* The target bitmap. */
14float x, y, dx, dy; /* Position and velocity of moving rectangle. */
15double last_time; /* For controling speed. */
16bool quit; /* Flag to record Esc key or X button. */
17ALLEGRO_FONT *myfont; /* Our font. */
18ALLEGRO_EVENT_QUEUE *queue; /* Our events queue. */
19
20int main(void)
21{
22
23al_init();
24 al_init_primitives_addon();
25 al_install_keyboard();
26 al_init_image_addon();
27 al_init_font_addon();
28 al_set_new_display_flags(ALLEGRO_RESIZABLE | ALLEGRO_OPENGL);
29 al_set_new_bitmap_flags(ALLEGRO_VIDEO_BITMAP | ALLEGRO_MIPMAP);
30 display = al_create_display(640, 480);
31
32
33 queue = al_create_event_queue();
34 al_register_event_source(queue, al_get_keyboard_event_source());
35 al_register_event_source(queue, al_get_display_event_source(display));
36
37target = al_create_bitmap(300,300);
38
39 while (!quit) {
40al_clear_to_color(al_map_rgb(0,0,0));
41al_set_target_bitmap(target);
42al_draw_filled_circle(0,0,90,al_map_rgb(0,0,255));
43al_set_target_bitmap(al_get_backbuffer(display));
44al_draw_bitmap(target,0,0,0);
45al_flip_display();
46 }
47
48 al_destroy_event_queue(queue);
49
50 return 0;
51}
I think this is a bug. Unless there is something I have overlooked in the changes. Thanks Agui GUI API -> https://github.com/jmasterx/Agui |
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