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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * Copyright 2023 Mike Becker. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions are met: |
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7 | * |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * |
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15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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16 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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19 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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20 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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21 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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24 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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25 | * POSSIBILITY OF SUCH DAMAGE. |
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26 | */ |
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27 | |
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28 | #include "ascension/scene.h" |
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29 | |
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30 | #include "ascension/context.h" |
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31 | |
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32 | #include <cx/linked_list.h> |
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33 | #include <cx/array_list.h> |
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34 | #include <cx/tree.h> |
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35 | #include <cx/utils.h> |
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36 | |
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37 | #include "ascension/shader.h" |
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38 | #include <GL/glew.h> |
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39 | |
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40 | #include <assert.h> |
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41 | |
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42 | static CxTreeIterator asc_scene_node_iterator( |
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43 | AscSceneNode *node, |
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44 | bool visit_on_exit |
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45 | ) { |
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46 | return cx_tree_iterator( |
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47 | node, visit_on_exit, |
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48 | offsetof(AscSceneNode, children), |
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49 | offsetof(AscSceneNode, next) |
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50 | ); |
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51 | } |
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52 | |
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53 | static CxTreeVisitor asc_scene_node_visitor(AscSceneNode *node) { |
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54 | return cx_tree_visitor(node, |
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55 | offsetof(AscSceneNode, children), |
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56 | offsetof(AscSceneNode, next) |
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57 | ); |
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58 | } |
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59 | |
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60 | struct asc_render_group_entry { |
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61 | asc_scene_draw_func draw; |
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62 | AscSceneNode const *node; |
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63 | }; |
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64 | |
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65 | #define asc_draw_render_group(iter) \ |
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66 | cx_foreach(struct asc_render_group_entry*, entry, iter) { \ |
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67 | entry->draw(entry->node); \ |
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68 | } |
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69 | |
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70 | void asc_scene_draw(AscSceneNode *root, asc_recti viewport, AscCamera *camera) { |
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71 | // create render groups |
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72 | CxList *render_group[ASC_RENDER_GROUP_COUNT]; |
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73 | cx_for_n(i, ASC_RENDER_GROUP_COUNT) { |
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74 | render_group[i] = cxArrayListCreateSimple( |
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75 | sizeof(struct asc_render_group_entry), 32); |
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76 | } |
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77 | |
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78 | // skip the root node deliberately, we know it's just the container |
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79 | CxTreeVisitor iter = asc_scene_node_visitor(root); |
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80 | cxIteratorNext(iter); |
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81 | |
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82 | // update the children and add them to the render groups |
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83 | cx_foreach(AscSceneNode*, node, iter) { |
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84 | node->depth = iter.depth; |
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85 | |
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86 | // execute behaviors, first |
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87 | if (node->behaviors != NULL) { |
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88 | CxIterator behavior_iter = cxListIterator(node->behaviors); |
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89 | cx_foreach(asc_scene_update_func, behavior, behavior_iter) { |
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90 | behavior(node); |
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91 | } |
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92 | } |
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93 | |
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94 | // TODO: implement culling |
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95 | // TODO: implement a hidden flag (requires UCX tree-continue function) |
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96 | |
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97 | // check if geometry needs update |
39 | 98 | if (node->need_graphics_update) { |
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99 | assert(node->update_func != NULL); |
39 | 100 | node->need_graphics_update = false; |
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101 | node->update_func(node); |
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102 | } |
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103 | if (node->need_transform_update) { |
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104 | node->need_transform_update = false; |
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105 | asc_transform_from_parts( |
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106 | node->transform, |
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107 | node->position, |
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108 | node->scale, |
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109 | node->rotation |
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110 | ); |
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111 | asc_mat4f_mulst( |
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112 | node->world_transform, |
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113 | node->transform, |
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114 | node->parent->world_transform |
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115 | ); |
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116 | } |
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117 | |
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118 | // add to render group |
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119 | if (node->draw_func != NULL) { |
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120 | struct asc_render_group_entry entry = { |
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121 | node->draw_func, node |
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122 | }; |
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123 | cxListAdd(render_group[node->render_group], &entry); |
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124 | } |
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125 | } |
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126 | |
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127 | // set the viewport (in OpenGL we need to invert the Y axis) |
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128 | glViewport( |
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129 | viewport.pos.x, |
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130 | -viewport.pos.y, |
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131 | viewport.size.width, |
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132 | viewport.size.height |
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133 | ); |
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134 | |
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135 | // ------------------------- |
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136 | // process the render groups |
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137 | // ------------------------- |
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138 | AscShaderProgram *shader; |
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139 | CxIterator render_iter; |
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140 | |
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141 | // 2D Elements |
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142 | // =========== |
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143 | glEnable(GL_DEPTH_TEST); |
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144 | glClear(GL_DEPTH_BUFFER_BIT); |
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145 | |
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146 | // Sprites |
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147 | // ------- |
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148 | // TODO: implement view matrix for 2D worlds |
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149 | shader = &asc_context.active_window->glctx.shader.sprite.base; |
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150 | glUseProgram(shader->id); |
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151 | glUniformMatrix4fv(shader->projection, 1, |
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152 | GL_FALSE, camera->projection); |
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153 | |
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154 | // render opaque sprites from front to back |
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155 | glDisable(GL_BLEND); |
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156 | render_iter = cxListBackwardsIterator(render_group[ASC_RENDER_GROUP_SPRITE_OPAQUE]); |
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157 | asc_draw_render_group(render_iter); |
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158 | |
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159 | // render sprites with alpha value from back to front |
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160 | glEnable(GL_BLEND); |
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161 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
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162 | render_iter = cxListIterator(render_group[ASC_RENDER_GROUP_SPRITE_BLEND]); |
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163 | asc_draw_render_group(render_iter); |
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164 | |
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165 | // destroy render groups |
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166 | cx_for_n(i, ASC_RENDER_GROUP_COUNT) { |
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167 | cxListDestroy(render_group[i]); |
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168 | } |
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169 | } |
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170 | |
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171 | AscSceneNode *asc_scene_node_empty(void) { |
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172 | AscSceneNode *node = calloc(1, sizeof(AscSceneNode)); |
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173 | node->free_func = (asc_scene_free_func) free; |
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174 | node->scale.x = node->scale.y = node->scale.z = 1; |
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175 | asc_transform_identity(node->transform); |
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176 | asc_transform_identity(node->world_transform); |
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177 | return node; |
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178 | } |
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179 | |
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180 | void asc_scene_node_free(AscSceneNode *node) { |
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181 | if (node == NULL) return; |
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182 | |
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183 | // remove this node from its parent |
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184 | asc_scene_node_unlink(node); |
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185 | |
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186 | // free the entire subtree |
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187 | CxTreeIterator iter = asc_scene_node_iterator(node, true); |
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188 | cx_foreach(AscSceneNode*, child, iter) { |
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189 | if (!iter.exiting) continue; |
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190 | if (child->behaviors != NULL) { |
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191 | cxListDestroy(child->behaviors); |
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192 | } |
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193 | if (child->free_func != NULL) { |
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194 | child->free_func(child); |
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195 | } else { |
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196 | free(child); |
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197 | } |
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198 | } |
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199 | } |
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200 | |
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201 | void asc_scene_node_link(AscSceneNode * restrict parent, AscSceneNode * restrict node) { |
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202 | cx_tree_link( |
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203 | parent, node, |
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204 | offsetof(AscSceneNode, parent), |
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205 | offsetof(AscSceneNode, children), |
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206 | offsetof(AscSceneNode, prev), |
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207 | offsetof(AscSceneNode, next) |
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208 | ); |
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209 | } |
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210 | |
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211 | void asc_scene_node_unlink(AscSceneNode *node) { |
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212 | cx_tree_unlink( |
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213 | node, |
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214 | offsetof(AscSceneNode, parent), |
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215 | offsetof(AscSceneNode, children), |
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216 | offsetof(AscSceneNode, prev), |
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217 | offsetof(AscSceneNode, next) |
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218 | ); |
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219 | } |
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220 | |
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221 | void asc_scene_add_behavior( |
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222 | AscSceneNode *node, |
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223 | asc_scene_update_func behavior |
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224 | ) { |
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225 | if (node->behaviors == NULL) { |
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226 | node->behaviors = cxLinkedListCreateSimple(CX_STORE_POINTERS); |
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227 | } |
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228 | cxListAdd(node->behaviors, behavior); |
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229 | } |
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230 | |
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231 | void asc_scene_remove_behavior( |
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232 | AscSceneNode *node, |
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233 | asc_scene_update_func behavior |
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234 | ) { |
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235 | if (node->behaviors != NULL) { |
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236 | cxListFindRemove(node->behaviors, behavior); |
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237 | } |
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238 | } |
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239 | |
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240 | void asc_update_transform(AscSceneNode *node) { |
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241 | if (node->need_transform_update) return; |
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242 | |
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243 | CxTreeIterator iter = asc_scene_node_iterator(node, false); |
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244 | cx_foreach(AscSceneNode*, n, iter) { |
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245 | // TODO: break/continue when subtree is already marked for update |
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246 | n->need_transform_update = true; |
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247 | } |
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248 | } |