ascension: src/scene.c@9c44c55d327a

consistently refer to windows by ID - fixes #381

This change discovered that the font cache is completely broken. We created issue #387 for this.

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  * Copyright 2023 Mike Becker. All rights reserved.

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions are met:

     7  *

     8  *   1. Redistributions of source code must retain the above copyright

     9  *      notice, this list of conditions and the following disclaimer.

    10  *

    11  *   2. Redistributions in binary form must reproduce the above copyright

    12  *      notice, this list of conditions and the following disclaimer in the

    13  *      documentation and/or other materials provided with the distribution.

    14  *

    15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    16  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    18  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    19  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    20  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    21  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    25  * POSSIBILITY OF SUCH DAMAGE.

    26  */

    28 #include "ascension/scene.h"

    30 #include "ascension/context.h"

    31 #include "ascension/utils.h"

    33 #include <cx/linked_list.h>

    34 #include <cx/array_list.h>

    35 #include <cx/tree.h>

    36 #include <cx/utils.h>

    38 #include "ascension/shader.h"

    39 #include <GL/glew.h>

    41 #include <assert.h>

    43 static CxTreeIterator asc_scene_node_iterator(

    44         AscSceneNode *node,

    45         bool visit_on_exit

    46 ) {

    47     return cx_tree_iterator(

    48             node, visit_on_exit,

    49             offsetof(AscSceneNode, children),

    50             offsetof(AscSceneNode, next)

    51     );

    52 }

    54 static CxTreeVisitor asc_scene_node_visitor(AscSceneNode *node) {

    55     return cx_tree_visitor(node,

    56             offsetof(AscSceneNode, children),

    57             offsetof(AscSceneNode, next)

    58     );

    59 }

    61 struct asc_render_group_entry {

    62     asc_scene_draw_func draw;

    63     AscSceneNode const *node;

    64 };

    66 #define asc_draw_render_group(iter) \

    67     cx_foreach(struct asc_render_group_entry*, entry, iter) { \

    68         entry->draw(entry->node); \

    69     }

    71 void asc_scene_draw(AscSceneNode *root, asc_recti viewport, AscCamera *camera) {

    72     // create render groups

    73     CxList *render_group[ASC_RENDER_GROUP_COUNT];

    74     cx_for_n(i, ASC_RENDER_GROUP_COUNT) {

    75         render_group[i] = cxArrayListCreateSimple(

    76                 sizeof(struct asc_render_group_entry), 32);

    77     }

    79     // skip the root node deliberately, we know it's just the container

    80     CxTreeVisitor iter = asc_scene_node_visitor(root);

    81     cxIteratorNext(iter);

    83     // update the children and add them to the render groups

    84     cx_foreach(AscSceneNode*, node, iter) {

    85         node->depth = iter.depth;

    87         // skip hidden nodes (and all their children)

    88         if (asc_test_flag(node->flags, ASC_SCENE_NODE_HIDDEN)) {

    89             cxTreeVisitorContinue(iter);

    90         }

    92         // execute behaviors, first

    93         if (node->behaviors != NULL) {

    94             CxIterator behavior_iter = cxListIterator(node->behaviors);

    95             cx_foreach(asc_scene_update_func, behavior, behavior_iter) {

    96                 behavior(node);

    97             }

    98         }

   100         // TODO: implement culling

   102         // check if geometry needs update

   103         if (asc_test_flag(node->flags, ASC_SCENE_NODE_UPDATE_GRAPHICS)) {

   104             assert(node->update_func != NULL);

   105             asc_clear_flag(node->flags, ASC_SCENE_NODE_UPDATE_GRAPHICS);

   106             node->update_func(node);

   107         }

   108         if (asc_test_flag(node->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM)) {

   109             asc_test_flag(node->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM);

   110             asc_transform_from_parts(

   111                     node->transform,

   112                     node->position,

   113                     node->scale,

   114                     node->rotation

   115             );

   116             asc_mat4f_mulst(

   117                     node->world_transform,

   118                     node->transform,

   119                     node->parent->world_transform

   120             );

   121         }

   123         // add to render group

   124         if (node->draw_func != NULL) {

   125             struct asc_render_group_entry entry = {

   126                     node->draw_func, node

   127             };

   128             cxListAdd(render_group[node->render_group], &entry);

   129         }

   130     }

   132     // set the viewport (in OpenGL we need to invert the Y axis)

   133     glViewport(

   134             viewport.pos.x,

   135             -viewport.pos.y,

   136             viewport.size.width,

   137             viewport.size.height

   138     );

   140     // -------------------------

   141     // process the render groups

   142     // -------------------------

   143     AscShaderProgram *shader;

   144     CxIterator render_iter;

   146     // 2D Elements

   147     // ===========

   148     glEnable(GL_DEPTH_TEST);

   149     glClear(GL_DEPTH_BUFFER_BIT);

   151     // Sprites

   152     // -------

   153     // TODO: implement view matrix for 2D worlds

   154     shader = &asc_active_window->glctx.shader.sprite.base;

   155     glUseProgram(shader->id);

   156     glUniformMatrix4fv(shader->projection, 1,

   157                        GL_FALSE, camera->projection);

   159     // render opaque sprites from front to back

   160     glDisable(GL_BLEND);

   161     render_iter = cxListBackwardsIterator(render_group[ASC_RENDER_GROUP_SPRITE_OPAQUE]);

   162     asc_draw_render_group(render_iter);

   164     // render sprites with alpha value from back to front

   165     glEnable(GL_BLEND);

   166     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

   167     render_iter = cxListIterator(render_group[ASC_RENDER_GROUP_SPRITE_BLEND]);

   168     asc_draw_render_group(render_iter);

   170     // destroy render groups

   171     cx_for_n(i, ASC_RENDER_GROUP_COUNT) {

   172         cxListDestroy(render_group[i]);

   173     }

   174 }

   176 AscSceneNode *asc_scene_node_empty(void) {

   177     AscSceneNode *node = calloc(1, sizeof(AscSceneNode));

   178     node->free_func = (asc_scene_free_func) free;

   179     node->scale.x = node->scale.y = node->scale.z = 1;

   180     asc_transform_identity(node->transform);

   181     asc_transform_identity(node->world_transform);

   182     return node;

   183 }

   185 void asc_scene_node_free(AscSceneNode *node) {

   186     if (node == NULL) return;

   188     // remove this node from its parent

   189     asc_scene_node_unlink(node);

   191     // free the entire subtree

   192     CxTreeIterator iter = asc_scene_node_iterator(node, true);

   193     cx_foreach(AscSceneNode*, child, iter) {

   194         if (!iter.exiting) continue;

   195         if (child->behaviors != NULL) {

   196             cxListDestroy(child->behaviors);

   197         }

   198         if (child->free_func != NULL) {

   199             child->free_func(child);

   200         } else {

   201             free(child);

   202         }

   203     }

   204 }

   206 void asc_scene_node_link(AscSceneNode * restrict parent, AscSceneNode * restrict node) {

   207     cx_tree_link(

   208             parent, node,

   209             offsetof(AscSceneNode, parent),

   210             offsetof(AscSceneNode, children),

   211             offsetof(AscSceneNode, prev),

   212             offsetof(AscSceneNode, next)

   213     );

   214 }

   216 void asc_scene_node_unlink(AscSceneNode *node) {

   217     cx_tree_unlink(

   218             node,

   219             offsetof(AscSceneNode, parent),

   220             offsetof(AscSceneNode, children),

   221             offsetof(AscSceneNode, prev),

   222             offsetof(AscSceneNode, next)

   223     );

   224 }

   226 void asc_scene_add_behavior(

   227         AscSceneNode *node,

   228         asc_scene_update_func behavior

   229 ) {

   230     if (node->behaviors == NULL) {

   231         node->behaviors = cxLinkedListCreateSimple(CX_STORE_POINTERS);

   232     }

   233     cxListAdd(node->behaviors, behavior);

   234 }

   236 void asc_scene_remove_behavior(

   237         AscSceneNode *node,

   238         asc_scene_update_func behavior

   239 ) {

   240     if (node->behaviors != NULL) {

   241         cxListFindRemove(node->behaviors, behavior);

   242     }

   243 }

   245 void asc_node_update(AscSceneNode *node) {

   246     asc_set_flag(node->flags, ASC_SCENE_NODE_UPDATE_GRAPHICS);

   247 }

   249 void asc_node_update_transform(AscSceneNode *node) {

   250     // fast skip if node is already marked

   251     if (asc_test_flag(node->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM)) {

   252         return;

   253     }

   255     CxTreeIterator iter = asc_scene_node_iterator(node, false);

   256     cx_foreach(AscSceneNode*, n, iter) {

   257         if (asc_test_flag(n->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM)) {

   258             cxTreeIteratorContinue(iter);

   259         }

   260         asc_set_flag(n->flags, ASC_SCENE_NODE_UPDATE_TRANSFORM);

   261     }

   262 }

Mercurial > hg > ascension / file revision

src/scene.c@9c44c55d327a

src/scene.c