// for al_set_new_bitmap_depth #define ALLEGRO_UNSTABLE #include #include #include #include #define RED al_map_rgb(255, 0, 0) #define LIGHT_BLUE al_map_rgb(128, 128, 255) #define BLUE al_map_rgb(0, 0, 255) #define DARK_BLUE al_map_rgb(0, 0, 192) #define GREEN al_map_rgb(0, 255, 0) #define DARK_GREEN al_map_rgb(0, 192, 0) #define YELLOW al_map_rgb(255, 255, 0) #define BLACK al_map_rgb(0, 0, 0) #define WHITE al_map_rgb(255, 255, 255) #define LIGHT_GREY al_map_rgb(192, 192, 192) #define GREY al_map_rgb(128, 128, 128) #define DARK_GREY al_map_rgb(64, 64, 64) #define CYAN al_map_rgb(0, 255, 255) #define MAGENTA al_map_rgb(255, 0, 255) #define TRANSPARENT al_map_rgba(0, 0, 0, 0) #define ORANGE al_map_rgb(255, 192, 0) #define BROWN al_map_rgb(192, 168, 128) /* static const char *default_glsl_vertex_source = "attribute vec4 " ALLEGRO_SHADER_VAR_POS ";\n" "attribute vec4 " ALLEGRO_SHADER_VAR_COLOR ";\n" "attribute vec2 " ALLEGRO_SHADER_VAR_TEXCOORD ";\n" "uniform mat4 " ALLEGRO_SHADER_VAR_PROJVIEW_MATRIX ";\n" "uniform bool " ALLEGRO_SHADER_VAR_USE_TEX_MATRIX ";\n" "uniform mat4 " ALLEGRO_SHADER_VAR_TEX_MATRIX ";\n" "varying vec4 varying_color;\n" "varying vec2 varying_texcoord;\n" "void main()\n" "{\n" " varying_color = " ALLEGRO_SHADER_VAR_COLOR ";\n" " if (" ALLEGRO_SHADER_VAR_USE_TEX_MATRIX ") {\n" " vec4 uv = " ALLEGRO_SHADER_VAR_TEX_MATRIX " * vec4(" ALLEGRO_SHADER_VAR_TEXCOORD ", 0, 1);\n" " varying_texcoord = vec2(uv.x, uv.y);\n" " }\n" " else\n" " varying_texcoord = " ALLEGRO_SHADER_VAR_TEXCOORD";\n" " gl_Position = " ALLEGRO_SHADER_VAR_PROJVIEW_MATRIX " * " ALLEGRO_SHADER_VAR_POS ";\n" "}\n"; */ /* static const char *default_glsl_pixel_source = "#ifdef GL_ES\n" "precision lowp float;\n" "#endif\n" "uniform sampler2D " ALLEGRO_SHADER_VAR_TEX ";\n" "uniform bool " ALLEGRO_SHADER_VAR_USE_TEX ";\n" "varying vec4 varying_color;\n" "varying vec2 varying_texcoord;\n" "void main()\n" "{\n" " if (" ALLEGRO_SHADER_VAR_USE_TEX ")\n" " gl_FragColor = varying_color * texture2D(" ALLEGRO_SHADER_VAR_TEX ", varying_texcoord);\n" " else\n" " gl_FragColor = varying_color;\n" "}\n"; */ /* static const char *testing_glsl_pixel_source = "#ifdef GL_ES\n" "precision lowp float;\n" "#endif\n" "uniform sampler2D " ALLEGRO_SHADER_VAR_TEX ";\n" "uniform bool " ALLEGRO_SHADER_VAR_USE_TEX ";\n" "varying vec4 varying_color;\n" "varying vec2 varying_texcoord;\n" "void main()\n" "{\n" " gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);\n" "}\n"; */ static const char *discarding_glsl_pixel_source = "#ifdef GL_ES\n" "precision lowp float;\n" "#endif\n" "uniform sampler2D " ALLEGRO_SHADER_VAR_TEX ";\n" "uniform bool " ALLEGRO_SHADER_VAR_USE_TEX ";\n" "varying vec4 varying_color;\n" "varying vec2 varying_texcoord;\n" "void main()\n" "{\n" " if (" ALLEGRO_SHADER_VAR_USE_TEX ") {\n" " vec4 p = texture2D(" ALLEGRO_SHADER_VAR_TEX ", varying_texcoord);\n" " if (p.a == 0.0) {\n" " discard;\n" " }\n" " gl_FragColor = varying_color * p;\n" " }\n" " else\n" " gl_FragColor = varying_color;\n" "}\n"; class Main { private: ALLEGRO_BITMAP *buffer; ALLEGRO_FONT *font; ALLEGRO_BITMAP *orange, *yellow, *blue; public: int init(); void run(); void drawEyes() { al_draw_filled_circle(32, 64, 8, WHITE); al_draw_filled_circle(80, 64, 8, WHITE); al_draw_filled_circle(32, 64, 4, BLACK); al_draw_filled_circle(80, 64, 4, BLACK); } void initSprites() { al_set_new_bitmap_flags(ALLEGRO_VIDEO_BITMAP); orange = al_create_bitmap(128, 128); yellow = al_create_bitmap(128, 128); blue = al_create_bitmap(128, 128); al_set_target_bitmap(orange); al_clear_to_color(TRANSPARENT); al_draw_filled_ellipse(64, 64, 64, 48, LIGHT_GREY); al_draw_filled_ellipse(60, 60, 56, 40, ORANGE); drawEyes(); al_set_target_bitmap(yellow); al_clear_to_color(TRANSPARENT); al_draw_filled_ellipse(64, 64, 48, 64, LIGHT_GREY); al_draw_filled_ellipse(60, 60, 40, 56, YELLOW); drawEyes(); al_set_target_bitmap(blue); al_clear_to_color(TRANSPARENT); al_draw_filled_ellipse(64, 64, 64, 48, GREY); al_draw_filled_ellipse(60, 60, 56, 40, BLUE); drawEyes(); } void drawSprite(ALLEGRO_BITMAP *sprite, int x, int y, float z) { ALLEGRO_TRANSFORM transform; al_identity_transform(&transform); al_translate_transform_3d(&transform, 0, 0, z); al_use_transform (&transform); al_draw_bitmap (sprite, x, y, 0); } void drawScene() { al_clear_depth_buffer(1); // 1 is infinite distance al_set_render_state(ALLEGRO_DEPTH_TEST, true); // draw floor // should be rendered at distance 0 al_draw_line( 0, 479, 240, 239, CYAN, 1.0); al_draw_line(240, 239, 639, 239, CYAN, 1.0); al_draw_line(639, 239, 399, 479, CYAN, 1.0); al_draw_line(399, 479, 0, 479, CYAN, 1.0); // draw sprites in reverse order drawSprite (orange, 256 , 256 , -0.7); drawSprite (yellow, 256 + 32, 256 - 32, -0.6); drawSprite (blue, 256 + 64, 256 - 64, -0.5); } ALLEGRO_SHADER *shader; void createShader() { shader = al_create_shader(ALLEGRO_SHADER_AUTO); assert(shader); bool ok; ok = al_attach_shader_source(shader, ALLEGRO_PIXEL_SHADER, discarding_glsl_pixel_source); //TODO: assert with message format... if (!ok) printf ("al_attach_shader_source failed: %s\n", al_get_shader_log(shader)); assert(ok); ok = al_attach_shader_source(shader, ALLEGRO_VERTEX_SHADER, al_get_default_shader_source(ALLEGRO_SHADER_GLSL, ALLEGRO_VERTEX_SHADER)); //TODO: assert with message format... if (!ok) printf ("al_attach_shader_source failed: %s\n", al_get_shader_log(shader)); assert(ok); ok = al_build_shader(shader); //TODO: assert with message... if (!ok) printf ("al_build_shader failed: %s\n", al_get_shader_log(shader)); assert(ok); } void enableShader() { al_use_shader(shader); } void disableShader() { al_use_shader(NULL); } }; int Main::init() { ALLEGRO_DISPLAY *display; ALLEGRO_TIMER *timer; ALLEGRO_CONFIG *config; if (!al_init()) { return 0; } al_init_primitives_addon(); al_install_keyboard(); al_init_font_addon(); al_set_new_display_flags(ALLEGRO_PROGRAMMABLE_PIPELINE|ALLEGRO_OPENGL); display = al_create_display(640, 480); if (!display) { return 0; } font = al_create_builtin_font(); initSprites(); createShader(); return 1; } void Main::run() { al_set_new_bitmap_depth(16); // needs ALLEGRO_UNSTABLE ALLEGRO_BITMAP *buffer = al_create_bitmap (640, 480); al_set_target_bitmap(buffer); enableShader(); drawScene(); al_set_target_bitmap (al_get_backbuffer(al_get_current_display())); al_draw_bitmap(buffer, 0, 0, 0); al_flip_display(); ALLEGRO_EVENT_QUEUE *queue; queue = al_create_event_queue(); al_register_event_source(queue, al_get_keyboard_event_source()); ALLEGRO_EVENT event; al_wait_for_event(queue, &event); al_destroy_event_queue(queue); return; } int main(int argc, const char *const *argv) { Main m; if (m.init()) { m.run(); } return 0; }