ascension: src/scene.c@cc912686f663 (annotated)

src/scene.c@cc912686f663 (annotated)

src/scene.c

Thu, 21 Mar 2024 23:00:39 +0100

author: Mike Becker <universe@uap-core.de>
date: Thu, 21 Mar 2024 23:00:39 +0100
changeset 42: cc912686f663
parent 41: df81d493716e
child 43: 5a8c31904e44
permissions: -rw-r--r--

increase maximum possible number of 2D layers

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  * Copyright 2023 Mike Becker. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright
  *      notice, this list of conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright
  *      notice, this list of conditions and the following disclaimer in the
  *      documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include "ascension/scene.h"
 #include "ascension/error.h"
 #include "ascension/context.h"
 #include <cx/tree.h>
 #include <cx/utils.h>
 #include "ascension/shader.h"
 #include <GL/glew.h>
 #include <assert.h>
 static CxTreeIterator asc_scene_node_iterator(
         AscSceneNode *node,
         bool visit_on_exit
 ) {
     return cx_tree_iterator(
             node, visit_on_exit,
             offsetof(AscSceneNode, children),
             offsetof(AscSceneNode, next)
     );
 }
 void asc_scene_init(AscScene *scene) {
     if (scene->root != NULL) {
         asc_error("Scene is already initialized.");
         return;
     }
     // zero everything, first
     memset(scene, 0, sizeof(AscScene));
     // default viewport is the entire viewport of the active window
     scene->viewport.size = asc_context.active_window->dimensions;
     // create the root node
     scene->root = asc_scene_node_empty();
     // initialize the render groups
     cx_array_initialize(scene->rg_sprites_opaque, 8);
     cx_array_initialize(scene->rg_sprites_blended, 8);
 }
 void asc_scene_destroy(AscScene *scene) {
     asc_scene_node_free(scene->root);
 }
 void asc_scene_add(AscScene *scene, AscSceneNode *node) {
     asc_scene_node_link(scene->root, node);
     asc_node_update(node);
 }
 #define asc_scene_draw_render_group(rg) \
     cx_for_n(i, rg##_size) { \
         rg[i].draw(rg[i].node); \
     } (void)0
 #define asc_scene_draw_render_group_reversed(rg) \
     for(size_t i = rg##_size ; i > 0 ; i--) { \
         rg[i-1].draw(rg[i-1].node); \
     } (void)0
 void asc_scene_draw(AscScene *scene) {
     // reset render groups
     // TODO: avoid recalculating the groups, if possible
     scene->rg_sprites_opaque_size = 0;
     scene->rg_sprites_blended_size = 0;
     // skip the root node deliberately, we know it's just the container
     CxTreeIterator iter = asc_scene_node_iterator(scene->root, false);
     cxIteratorNext(iter);
     // update the children and add them to the render groups
     cx_foreach(AscSceneNode*, node, iter) {
         node->depth = iter.depth;
         // execute behaviors, first
         AscBehaviorNode *behavior = node->behaviors;
         while (behavior) {
             behavior->func(node);
             behavior = behavior->next;
         }
         // check if geometry needs update
         if (node->need_graphics_update) {
             assert(node->update_func != NULL);
             node->need_graphics_update = false;
             node->update_func(node);
         }
         if (node->need_transform_update) {
             assert(node->transform_update_func != NULL);
             node->need_transform_update = false;
             asc_transform_identity(node->local_transform);
             asc_transform_copy(node->world_transform, node->parent->world_transform);
             node->transform_update_func(node);
             asc_mat4f_mulst(node->final_transform, node->local_transform, node->world_transform);
         }
         // add to render group
         if (node->draw_func != NULL) {
             struct asc_render_group_entry entry = {
                     node->draw_func, node
             };
             switch (node->render_group) {
                 case ASC_RENDER_GROUP_SPRITE_OPAQUE:
                     cx_array_simple_add(scene->rg_sprites_opaque, entry);
                     break;
                 case ASC_RENDER_GROUP_SPRITE_BLEND:
                     cx_array_simple_add(scene->rg_sprites_blended, entry);
                     break;
             }
         }
     }
     // set the viewport (in OpenGL we need to invert the Y axis)
     glViewport(
             scene->viewport.pos.x,
             -scene->viewport.pos.y,
             scene->viewport.size.width,
             scene->viewport.size.height
     );
     glClear(GL_COLOR_BUFFER_BIT);
     // -----------------------------------------
     // process the render groups for each camera
     // -----------------------------------------
     cx_for_n(cam_id, ASC_SCENE_CAMERAS_MAX) {
         // update camera parameters, first
         AscCamera *camera = &scene->cameras[cam_id];
         if (camera->update == NULL) continue;
         camera->update(camera);
         // 2D Elements
         // ===========
         glEnable(GL_DEPTH_TEST);
         glClear(GL_DEPTH_BUFFER_BIT);
         // Sprites
         // -------
         // TODO: see if we can really always ignore the view matrix
         glUseProgram(ASC_SHADER_SPRITE.base.id);
         glUniformMatrix4fv(ASC_SHADER_SPRITE.base.projection, 1,
                            GL_FALSE, camera->projection);
         // render opaque sprites from front to back
         glDisable(GL_BLEND);
         asc_scene_draw_render_group_reversed(scene->rg_sprites_opaque);
         // render sprites with alpha value from back to front
         glEnable(GL_BLEND);
         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
         asc_scene_draw_render_group(scene->rg_sprites_blended);
     }
 }
 AscSceneNode *asc_scene_node_empty(void) {
     AscSceneNode *node = calloc(1, sizeof(AscSceneNode));
     node->free_func = (asc_scene_free_func) free;
     asc_transform_identity(node->local_transform);
     asc_transform_identity(node->world_transform);
     asc_transform_identity(node->final_transform);
     return node;
 }
 void asc_scene_node_free(AscSceneNode *node) {
     if (node == NULL) return;
     // remove this node from its parent
     asc_scene_node_unlink(node);
     // free the entire subtree
     CxTreeIterator iter = asc_scene_node_iterator(node, true);
     cx_foreach(AscSceneNode*, child, iter) {
         if (!iter.exiting) continue;
         if (child->free_func != NULL) {
             child->free_func(child);
         } else {
             free(child);
         }
     }
 }
 void asc_scene_node_link(AscSceneNode * restrict parent, AscSceneNode * restrict node) {
     cx_tree_link(
             parent, node,
             offsetof(AscSceneNode, parent),
             offsetof(AscSceneNode, children),
             offsetof(AscSceneNode, prev),
             offsetof(AscSceneNode, next)
     );
 }
 void asc_scene_node_unlink(AscSceneNode *node) {
     cx_tree_unlink(
             node,
             offsetof(AscSceneNode, parent),
             offsetof(AscSceneNode, children),
             offsetof(AscSceneNode, prev),
             offsetof(AscSceneNode, next)
     );
 }
 AscBehaviorNode *asc_scene_add_behavior(AscSceneNode *node, asc_scene_update_func behavior) {
     AscBehaviorNode *behavior_node = calloc(1, sizeof(AscBehaviorNode));
     behavior_node->func = behavior;
     cx_tree_link(
             node,
             behavior_node,
             offsetof(AscBehaviorNode, parent),
             offsetof(AscSceneNode, behaviors),
             offsetof(AscBehaviorNode, prev),
             offsetof(AscBehaviorNode, next)
     );
     return behavior_node;
 }
 void asc_scene_remove_behavior(AscBehaviorNode *node) {
     cx_tree_unlink(
             node,
             offsetof(AscBehaviorNode, parent),
             offsetof(AscSceneNode, behaviors),
             offsetof(AscBehaviorNode, prev),
             offsetof(AscBehaviorNode, next)
     );
 }
 void asc_node_update_transform(AscSceneNode *node) {
     CxTreeIterator iter = asc_scene_node_iterator(node, false);
     cx_foreach(AscSceneNode*, n, iter) {
         n->need_transform_update = true;
     }
 }

Mercurial > hg > ascension / annotate

src/scene.c@cc912686f663 (annotated)

src/scene.c