ascension: src/scene.c@b3da4096c607

create own compilation unit for GL context - fixes shader not being created per context

     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"

    29 #include "ascension/error.h"

    31 #include "ascension/context.h"

    33 #include <cx/tree.h>

    34 #include <cx/utils.h>

    36 #include "ascension/shader.h"

    37 #include <GL/glew.h>

    39 #include <assert.h>

    41 static CxTreeIterator asc_scene_node_iterator(

    42         AscSceneNode *node,

    43         bool visit_on_exit

    44 ) {

    45     return cx_tree_iterator(

    46             node, visit_on_exit,

    47             offsetof(AscSceneNode, children),

    48             offsetof(AscSceneNode, next)

    49     );

    50 }

    52 static CxTreeVisitor asc_scene_node_visitor(AscSceneNode *node) {

    53     return cx_tree_visitor(node,

    54             offsetof(AscSceneNode, children),

    55             offsetof(AscSceneNode, next)

    56     );

    57 }

    59 void asc_scene_init(AscScene *scene) {

    60     if (scene->root != NULL) {

    61         asc_error("Scene is already initialized.");

    62         return;

    63     }

    65     // zero everything, first

    66     memset(scene, 0, sizeof(AscScene));

    68     // default viewport is the entire viewport of the active window

    69     scene->viewport.size = asc_context.active_window->dimensions;

    71     // create the root node

    72     scene->root = asc_scene_node_empty();

    74     // initialize the render groups

    75     cx_array_initialize(scene->rg_sprites_opaque, 8);

    76     cx_array_initialize(scene->rg_sprites_blended, 8);

    77 }

    79 void asc_scene_destroy(AscScene *scene) {

    80     asc_scene_node_free(scene->root);

    81 }

    83 void asc_scene_add(AscScene *scene, AscSceneNode *node) {

    84     asc_scene_node_link(scene->root, node);

    85     asc_node_update(node);

    86 }

    88 #define asc_scene_draw_render_group(rg) \

    89     cx_for_n(i, rg##_size) { \

    90         rg[i].draw(rg[i].node); \

    91     } (void)0

    93 #define asc_scene_draw_render_group_reversed(rg) \

    94     for(size_t i = rg##_size ; i > 0 ; i--) { \

    95         rg[i-1].draw(rg[i-1].node); \

    96     } (void)0

    98 void asc_scene_draw(AscScene *scene) {

    99     // reset render groups

   100     // TODO: avoid recalculating the groups, if possible

   101     scene->rg_sprites_opaque_size = 0;

   102     scene->rg_sprites_blended_size = 0;

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

   105     CxTreeVisitor iter = asc_scene_node_visitor(scene->root);

   106     cxIteratorNext(iter);

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

   109     cx_foreach(AscSceneNode*, node, iter) {

   110         node->depth = iter.depth;

   112         // execute behaviors, first

   113         AscBehaviorNode *behavior = node->behaviors;

   114         while (behavior) {

   115             behavior->func(node);

   116             behavior = behavior->next;

   117         }

   119         // check if geometry needs update

   120         if (node->need_graphics_update) {

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

   122             node->need_graphics_update = false;

   123             node->update_func(node);

   124         }

   125         if (node->need_transform_update) {

   126             assert(node->transform_update_func != NULL);

   127             node->need_transform_update = false;

   128             asc_transform_identity(node->local_transform);

   129             asc_transform_copy(node->world_transform, node->parent->world_transform);

   130             node->transform_update_func(node);

   131             asc_mat4f_mulst(node->final_transform, node->local_transform, node->world_transform);

   132         }

   134         // add to render group

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

   136             struct asc_render_group_entry entry = {

   137                     node->draw_func, node

   138             };

   139             switch (node->render_group) {

   140                 case ASC_RENDER_GROUP_SPRITE_OPAQUE:

   141                     cx_array_simple_add(scene->rg_sprites_opaque, entry);

   142                     break;

   143                 case ASC_RENDER_GROUP_SPRITE_BLEND:

   144                     cx_array_simple_add(scene->rg_sprites_blended, entry);

   145                     break;

   146             }

   147         }

   148     }

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

   151     glViewport(

   152             scene->viewport.pos.x,

   153             -scene->viewport.pos.y,

   154             scene->viewport.size.width,

   155             scene->viewport.size.height

   156     );

   157     glClear(GL_COLOR_BUFFER_BIT);

   159     // -----------------------------------------

   160     // process the render groups for each camera

   161     // -----------------------------------------

   162     AscShaderProgram *shader;

   163     cx_for_n(cam_id, ASC_SCENE_CAMERAS_MAX) {

   164         // update camera parameters, first

   165         AscCamera *camera = &scene->cameras[cam_id];

   166         if (camera->update == NULL) continue;

   167         camera->update(camera);

   169         // 2D Elements

   170         // ===========

   171         glEnable(GL_DEPTH_TEST);

   172         glClear(GL_DEPTH_BUFFER_BIT);

   174         // Sprites

   175         // -------

   176         // TODO: see if we can really always ignore the view matrix

   177         shader = &asc_context.active_window->glctx.shader.sprite;

   178         glUseProgram(shader->id);

   179         glUniformMatrix4fv(shader->projection, 1,

   180                            GL_FALSE, camera->projection);

   182         // render opaque sprites from front to back

   183         glDisable(GL_BLEND);

   184         asc_scene_draw_render_group_reversed(scene->rg_sprites_opaque);

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

   186         glEnable(GL_BLEND);

   187         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

   188         asc_scene_draw_render_group(scene->rg_sprites_blended);

   189     }

   190 }

   192 AscSceneNode *asc_scene_node_empty(void) {

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

   194     node->free_func = (asc_scene_free_func) free;

   195     asc_transform_identity(node->local_transform);

   196     asc_transform_identity(node->world_transform);

   197     asc_transform_identity(node->final_transform);

   198     return node;

   199 }

   201 void asc_scene_node_free(AscSceneNode *node) {

   202     if (node == NULL) return;

   204     // remove this node from its parent

   205     asc_scene_node_unlink(node);

   207     // free the entire subtree

   208     CxTreeIterator iter = asc_scene_node_iterator(node, true);

   209     cx_foreach(AscSceneNode*, child, iter) {

   210         if (!iter.exiting) continue;

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

   212             child->free_func(child);

   213         } else {

   214             free(child);

   215         }

   216     }

   217 }

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

   220     cx_tree_link(

   221             parent, node,

   222             offsetof(AscSceneNode, parent),

   223             offsetof(AscSceneNode, children),

   224             offsetof(AscSceneNode, prev),

   225             offsetof(AscSceneNode, next)

   226     );

   227 }

   229 void asc_scene_node_unlink(AscSceneNode *node) {

   230     cx_tree_unlink(

   231             node,

   232             offsetof(AscSceneNode, parent),

   233             offsetof(AscSceneNode, children),

   234             offsetof(AscSceneNode, prev),

   235             offsetof(AscSceneNode, next)

   236     );

   237 }

   239 AscBehaviorNode *asc_scene_add_behavior(AscSceneNode *node, asc_scene_update_func behavior) {

   240     AscBehaviorNode *behavior_node = calloc(1, sizeof(AscBehaviorNode));

   241     behavior_node->func = behavior;

   242     cx_tree_link(

   243             node,

   244             behavior_node,

   245             offsetof(AscBehaviorNode, parent),

   246             offsetof(AscSceneNode, behaviors),

   247             offsetof(AscBehaviorNode, prev),

   248             offsetof(AscBehaviorNode, next)

   249     );

   250     return behavior_node;

   251 }

   253 void asc_scene_remove_behavior(AscBehaviorNode *node) {

   254     cx_tree_unlink(

   255             node,

   256             offsetof(AscBehaviorNode, parent),

   257             offsetof(AscSceneNode, behaviors),

   258             offsetof(AscBehaviorNode, prev),

   259             offsetof(AscBehaviorNode, next)

   260     );

   261 }

   263 void asc_node_update_transform(AscSceneNode *node) {

   264     CxTreeIterator iter = asc_scene_node_iterator(node, false);

   265     cx_foreach(AscSceneNode*, n, iter) {

   266         n->need_transform_update = true;

   267     }

   268 }

Mercurial > hg > ascension / file revision

src/scene.c@b3da4096c607

src/scene.c