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| About shaders and ALLEGRO_BITMAPS |
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paulwayne
Member #16,605
December 2016
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I want to use shaders to create a 2d shadowing effect like this I have a simple shader that i can apply to the current display, and that works fine. Like this: 1al_set_target_backbuffer(display);
2al_use_shader(shader);
3.. draw
4al_use_shader(NULL);
5al_flip_display();
But when i try to use the shaders with a bitmap i cant make this to work. 1//draw things to bitmap
2al_set_target_bitmap(bmp);
3al_use_shader(shader);
4.. draw
5al_use_shader(NULL);
6
7//now display it
8al_set_target_backbuffer(display);
9al_clear_to_color(al_map_rgb(0, 0, 0));
10al_draw_bitmap(bmp, 0, 0, 0);
Maybe is something im missing since im new to allegro, any idea? |
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SiegeLord
Member #7,827
October 2006
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It should work, I just tried it on Linux and it seemed fine. What platform are you on? "For in much wisdom is much grief: and he that increases knowledge increases sorrow."-Ecclesiastes 1:18 |
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paulwayne
Member #16,605
December 2016
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Im on Windows 7 32 bits, Visual Studio 2013, and last Allegro version. |
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SiegeLord
Member #7,827
October 2006
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Interesting. I tried it on Windows myself, and it seemed to work ok. Try adding this line before al_init() to enable logging (it'll generate an allegro.log file in your working directory when you run the program): al_set_config_value(al_get_system_config(), "trace", "level", "debug"); It'll be useful to look at that log. Additionally, try doing this before you create the display to force OpenGL mode (by default, Allegro uses Direct3D on Windows): al_set_new_display_flags(ALLEGRO_PROGRAMMABLE_PIPELINE | ALLEGRO_OPENGL); Lastly, it'll be helpful if you produced a tiny program that reproduced your issue, so we can verify it's not something wrong in your code. "For in much wisdom is much grief: and he that increases knowledge increases sorrow."-Ecclesiastes 1:18 |
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paulwayne
Member #16,605
December 2016
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I finally got this to work. There was a problem with the shaders i was using. /facepalm |
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