ascension: src/scene.c@f18dc427f86f (annotated)

src/scene.c@f18dc427f86f (annotated)

src/scene.c

Thu, 18 Apr 2024 21:53:53 +0200

author: Mike Becker <universe@uap-core.de>
date: Thu, 18 Apr 2024 21:53:53 +0200
changeset 64: f18dc427f86f
parent 61: b7954818a6b7
child 65: 9c44c55d327a
permissions: -rw-r--r--

make use of the asc_window_active macro

 /*
  * 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/context.h"
 #include "ascension/utils.h"
 #include <cx/linked_list.h>
 #include <cx/array_list.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)
     );
 }
 static CxTreeVisitor asc_scene_node_visitor(AscSceneNode *node) {
     return cx_tree_visitor(node,
             offsetof(AscSceneNode, children),
             offsetof(AscSceneNode, next)
     );
 }
 struct asc_render_group_entry {
     asc_scene_draw_func draw;
     AscSceneNode const *node;
 };
 #define asc_draw_render_group(iter) \
     cx_foreach(struct asc_render_group_entry*, entry, iter) { \
         entry->draw(entry->node); \
     }
 void asc_scene_draw(AscSceneNode *root, asc_recti viewport, AscCamera *camera) {
     // create render groups
     CxList *render_group[ASC_RENDER_GROUP_COUNT];
     cx_for_n(i, ASC_RENDER_GROUP_COUNT) {
         render_group[i] = cxArrayListCreateSimple(
                 sizeof(struct asc_render_group_entry), 32);
     }
     // skip the root node deliberately, we know it's just the container
     CxTreeVisitor iter = asc_scene_node_visitor(root);
     cxIteratorNext(iter);
     // update the children and add them to the render groups
     cx_foreach(AscSceneNode*, node, iter) {
         node->depth = iter.depth;
         // skip hidden nodes (and all their children)
         if (asc_test_flag(node->flags, ASC_SCENE_NODE_HIDDEN)) {
             cxTreeVisitorContinue(iter);
         }
         // execute behaviors, first
         if (node->behaviors != NULL) {
             CxIterator behavior_iter = cxListIterator(node->behaviors);
             cx_foreach(asc_scene_update_func, behavior, behavior_iter) {
                 behavior(node);
             }
         }
         // TODO: implement culling
         // check if geometry needs update
         if (asc_test_flag(node->flags, ASC_SCENE_NODE_UPDATE_GRAPHICS)) {
             assert(node->update_func != NULL);
             asc_clear_flag(node->flags, ASC_SCENE_NODE_UPDATE_GRAPHICS);
             node->update_func(node);
         }
         if (asc_test_flag(node->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM)) {
             asc_test_flag(node->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM);
             asc_transform_from_parts(
                     node->transform,
                     node->position,
                     node->scale,
                     node->rotation
             );
             asc_mat4f_mulst(
                     node->world_transform,
                     node->transform,
                     node->parent->world_transform
             );
         }
         // add to render group
         if (node->draw_func != NULL) {
             struct asc_render_group_entry entry = {
                     node->draw_func, node
             };
             cxListAdd(render_group[node->render_group], &entry);
         }
     }
     // set the viewport (in OpenGL we need to invert the Y axis)
     glViewport(
             viewport.pos.x,
             -viewport.pos.y,
             viewport.size.width,
             viewport.size.height
     );
     // -------------------------
     // process the render groups
     // -------------------------
     AscShaderProgram *shader;
     CxIterator render_iter;
     // 2D Elements
     // ===========
     glEnable(GL_DEPTH_TEST);
     glClear(GL_DEPTH_BUFFER_BIT);
     // Sprites
     // -------
     // TODO: implement view matrix for 2D worlds
     shader = &asc_window_active->glctx.shader.sprite.base;
     glUseProgram(shader->id);
     glUniformMatrix4fv(shader->projection, 1,
                        GL_FALSE, camera->projection);
     // render opaque sprites from front to back
     glDisable(GL_BLEND);
     render_iter = cxListBackwardsIterator(render_group[ASC_RENDER_GROUP_SPRITE_OPAQUE]);
     asc_draw_render_group(render_iter);
     // render sprites with alpha value from back to front
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     render_iter = cxListIterator(render_group[ASC_RENDER_GROUP_SPRITE_BLEND]);
     asc_draw_render_group(render_iter);
     // destroy render groups
     cx_for_n(i, ASC_RENDER_GROUP_COUNT) {
         cxListDestroy(render_group[i]);
     }
 }
 AscSceneNode *asc_scene_node_empty(void) {
     AscSceneNode *node = calloc(1, sizeof(AscSceneNode));
     node->free_func = (asc_scene_free_func) free;
     node->scale.x = node->scale.y = node->scale.z = 1;
     asc_transform_identity(node->transform);
     asc_transform_identity(node->world_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->behaviors != NULL) {
             cxListDestroy(child->behaviors);
         }
         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)
     );
 }
 void asc_scene_add_behavior(
         AscSceneNode *node,
         asc_scene_update_func behavior
 ) {
     if (node->behaviors == NULL) {
         node->behaviors = cxLinkedListCreateSimple(CX_STORE_POINTERS);
     }
     cxListAdd(node->behaviors, behavior);
 }
 void asc_scene_remove_behavior(
         AscSceneNode *node,
         asc_scene_update_func behavior
 ) {
     if (node->behaviors != NULL) {
         cxListFindRemove(node->behaviors, behavior);
     }
 }
 void asc_node_update(AscSceneNode *node) {
     asc_set_flag(node->flags, ASC_SCENE_NODE_UPDATE_GRAPHICS);
 }
 void asc_node_update_transform(AscSceneNode *node) {
     // fast skip if node is already marked
     if (asc_test_flag(node->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM)) {
         return;
     }
     CxTreeIterator iter = asc_scene_node_iterator(node, false);
     cx_foreach(AscSceneNode*, n, iter) {
         if (asc_test_flag(n->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM)) {
             cxTreeIteratorContinue(iter);
         }
         asc_set_flag(n->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM);
     }
 }

Mercurial > hg > ascension / annotate

src/scene.c@f18dc427f86f (annotated)

src/scene.c