1.1 --- a/src/scene.c Thu Mar 21 20:48:18 2024 +0100
1.2 +++ b/src/scene.c Thu Mar 21 22:23:00 2024 +0100
1.3 @@ -65,8 +65,8 @@
1.4 scene->root = asc_scene_node_empty();
1.5
1.6 // initialize the render groups
1.7 - cx_array_initialize(scene->rg_none, 8);
1.8 - cx_array_initialize(scene->rg_fonts, 8);
1.9 + cx_array_initialize(scene->rg_sprites_opaque, 8);
1.10 + cx_array_initialize(scene->rg_sprites_blended, 8);
1.11 }
1.12
1.13 void asc_scene_destroy(AscScene *scene) {
1.14 @@ -83,10 +83,16 @@
1.15 rg[i].draw(rg[i].node); \
1.16 } (void)0
1.17
1.18 +#define asc_scene_draw_render_group_reversed(rg) \
1.19 + for(size_t i = rg##_size ; i > 0 ; i--) { \
1.20 + rg[i-1].draw(rg[i-1].node); \
1.21 + } (void)0
1.22 +
1.23 void asc_scene_draw(AscScene *scene) {
1.24 // reset render groups
1.25 - scene->rg_none_size = 0;
1.26 - scene->rg_fonts_size = 0;
1.27 + // TODO: avoid recalculating the groups, if possible
1.28 + scene->rg_sprites_opaque_size = 0;
1.29 + scene->rg_sprites_blended_size = 0;
1.30
1.31 // skip the root node deliberately, we know it's just the container
1.32 CxTreeIterator iter = asc_scene_node_iterator(scene->root, false);
1.33 @@ -94,6 +100,8 @@
1.34
1.35 // update the children and add them to the render groups
1.36 cx_foreach(AscSceneNode*, node, iter) {
1.37 + node->depth = iter.depth;
1.38 +
1.39 // execute behaviors, first
1.40 AscBehaviorNode *behavior = node->behaviors;
1.41 while (behavior) {
1.42 @@ -122,11 +130,11 @@
1.43 node->draw_func, node
1.44 };
1.45 switch (node->render_group) {
1.46 - case ASC_RENDER_GROUP_NONE:
1.47 - cx_array_simple_add(scene->rg_none, entry);
1.48 + case ASC_RENDER_GROUP_SPRITE_OPAQUE:
1.49 + cx_array_simple_add(scene->rg_sprites_opaque, entry);
1.50 break;
1.51 - case ASC_RENDER_GROUP_FONTS:
1.52 - cx_array_simple_add(scene->rg_fonts, entry);
1.53 + case ASC_RENDER_GROUP_SPRITE_BLEND:
1.54 + cx_array_simple_add(scene->rg_sprites_blended, entry);
1.55 break;
1.56 }
1.57 }
1.58 @@ -139,6 +147,7 @@
1.59 scene->viewport.size.width,
1.60 scene->viewport.size.height
1.61 );
1.62 + glClear(GL_COLOR_BUFFER_BIT);
1.63
1.64 // -----------------------------------------
1.65 // process the render groups for each camera
1.66 @@ -149,21 +158,25 @@
1.67 if (camera->update == NULL) continue;
1.68 camera->update(camera);
1.69
1.70 - // for the NONE group, the draw func is expected to do everything
1.71 + // 2D Elements
1.72 + // ===========
1.73 glEnable(GL_DEPTH_TEST);
1.74 - glDisable(GL_BLEND);
1.75 - asc_scene_draw_render_group(scene->rg_none);
1.76 + glClear(GL_DEPTH_BUFFER_BIT);
1.77
1.78 - // draw the FONTS group
1.79 - glDisable(GL_DEPTH_TEST);
1.80 - glEnable(GL_BLEND);
1.81 - glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
1.82 + // Sprites
1.83 + // -------
1.84 // TODO: see if we can really always ignore the view matrix
1.85 - // TODO: compute render order for alpha blending to work correctly
1.86 glUseProgram(ASC_SHADER_SPRITE.base.id);
1.87 glUniformMatrix4fv(ASC_SHADER_SPRITE.base.projection, 1,
1.88 GL_FALSE, camera->projection);
1.89 - asc_scene_draw_render_group(scene->rg_fonts);
1.90 +
1.91 + // render opaque sprites from front to back
1.92 + glDisable(GL_BLEND);
1.93 + asc_scene_draw_render_group_reversed(scene->rg_sprites_opaque);
1.94 + // render sprites with alpha value from back to front
1.95 + glEnable(GL_BLEND);
1.96 + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
1.97 + asc_scene_draw_render_group(scene->rg_sprites_blended);
1.98 }
1.99 }
1.100
