Fri, 01 Aug 2025 18:19:33 +0200
make the default window scaling and positioning screen resolution dependent
0 | 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 | */ | |
27 | ||
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28 | #include <ascension/core.h> |
48 | 29 | #include <ascension/ui.h> |
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30 | #include <ascension/sprite.h> |
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31 | #include <ascension/2d.h> |
48 | 32 | |
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33 | #include <cx/printf.h> |
0 | 34 | |
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35 | enum Textures2d { |
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36 | TEX_PLAYER = 0, |
101 | 37 | TEX_BACKDROP, |
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38 | TEX2D_COUNT |
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39 | }; |
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40 | static AscTexture tex2d[TEX2D_COUNT]; |
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41 | #define TEXTURE_PLAYER &tex2d[TEX_PLAYER] |
101 | 42 | #define TEXTURE_BACKDROP &tex2d[TEX_BACKDROP] |
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43 | |
101 | 44 | #define BACKDROP_SCENE asc_window_scene(0) |
45 | #define MAIN_SCENE asc_window_scene(1) | |
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46 | |
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47 | #define HUD_WIDTH 400 |
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48 | |
206 | 49 | enum MoveDirection { |
50 | MOVE_UP, | |
51 | MOVE_LEFT, | |
52 | MOVE_DOWN, | |
53 | MOVE_RIGHT | |
54 | }; | |
55 | ||
56 | static asc_transform rotations[4]; | |
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57 | static asc_vec2i directions[4]; |
206 | 58 | |
59 | typedef struct { | |
60 | enum MoveDirection direction; | |
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61 | enum MoveDirection target_direction; |
213 | 62 | /** |
63 | * The speed in tiles per second. | |
64 | */ | |
65 | float speed; | |
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66 | asc_vec2i new_position; |
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67 | bool reset_position; |
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68 | } Player; |
206 | 69 | |
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70 | static const unsigned game_field_size = 16; |
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71 | static const unsigned game_field_tile_size = 64; |
213 | 72 | |
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73 | static void globals_init(void) { |
206 | 74 | asc_transform_identity(rotations[MOVE_UP]); |
75 | asc_transform_roll(rotations[MOVE_LEFT], asc_rad(-90)); | |
76 | asc_transform_roll(rotations[MOVE_RIGHT], asc_rad(90)); | |
77 | asc_transform_roll(rotations[MOVE_DOWN], asc_rad(180)); | |
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78 | directions[MOVE_UP] = ASC_VEC2I(0, -1); |
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79 | directions[MOVE_LEFT] = ASC_VEC2I(-1, 0); |
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80 | directions[MOVE_DOWN] = ASC_VEC2I(0, 1); |
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81 | directions[MOVE_RIGHT] = ASC_VEC2I(1, 0); |
206 | 82 | } |
83 | ||
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84 | static void textures_destroy(void) { |
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85 | asc_texture_destroy(tex2d, TEX2D_COUNT); |
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86 | } |
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87 | |
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88 | static void textures_init(void) { |
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89 | asc_texture_init_2d(tex2d, TEX2D_COUNT); |
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90 | asc_texture_from_file(TEXTURE_PLAYER, "player.png"); |
101 | 91 | asc_texture_from_file(TEXTURE_BACKDROP, "backdrop.png"); |
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92 | asc_gl_context_add_cleanup_func(asc_active_glctx, textures_destroy); |
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93 | } |
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94 | |
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95 | static void backdrop_scale(AscBehavior *behavior) { |
213 | 96 | // scale the backdrop to the size of the window |
97 | if (asc_active_window->resized) { | |
98 | asc_ptr_cast(AscSprite, sprite, behavior->node); | |
99 | asc_vec2u window_size = asc_active_window->dimensions; | |
100 | asc_sprite_set_size(sprite, window_size); | |
101 | } | |
102 | } | |
103 | ||
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104 | static void backdrop_create(void) { |
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105 | const float scale = asc_active_window->ui_scale; |
213 | 106 | AscSceneNode *node = asc_sprite( |
107 | .texture = TEXTURE_BACKDROP, | |
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108 | .texture_scale_mode = ASC_TEXTURE_SCALE_REPEAT, |
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109 | .texture_scale_x = scale, .texture_scale_y = scale, |
213 | 110 | ); |
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111 | asc_behavior_add(node, .func = backdrop_scale); |
213 | 112 | asc_scene_add_node(BACKDROP_SCENE, node); |
113 | } | |
114 | ||
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115 | static void fps_counter_update(AscBehavior *behavior) { |
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116 | asc_ptr_cast(AscText, node, behavior->node); |
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117 | static float last_fps = 0.f; |
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118 | if (fabsf(asc_context.frame_rate - last_fps) > 1) { |
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119 | last_fps = asc_context.frame_rate; |
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120 | asc_text_printf(node, "%.2f FPS", asc_context.frame_rate); |
0 | 121 | } |
148
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122 | } |
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123 | |
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124 | static void fps_counter_tie_to_corner(AscBehavior *behavior) { |
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125 | // TODO: this should be replaced with some sort of UI layout manager |
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126 | AscSceneNode *node = behavior->node; |
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127 | if (asc_test_flag(node->flags, ASC_SCENE_NODE_GRAPHICS_UPDATED) || asc_active_window->resized) { |
105 | 128 | asc_vec2u bottom_right = asc_active_window->dimensions; |
116
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129 | asc_vec2u text_size = ((AscText*)node)->dimension; |
206 | 130 | asc_scene_node_set_position2f(node, ASC_VEC2F( |
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131 | (int) bottom_right.x - (int) text_size.width - 10, |
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132 | (int) bottom_right.y - (int) text_size.height - 10 |
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133 | )); |
37
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134 | } |
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135 | } |
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136 | |
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137 | static void fps_counter_create(void) { |
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138 | AscSceneNode *node = asc_text( |
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139 | .name = "FPS Counter", |
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140 | .color = ASC_RGB(255, 255, 255), |
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141 | .font = asc_font(ASC_FONT_REGULAR, 12), |
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142 | ); |
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143 | asc_behavior_add(node, .func = fps_counter_update, .interval = asc_seconds(1)); |
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144 | asc_behavior_add(node, fps_counter_tie_to_corner); |
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145 | asc_ui_add_node(node); |
70 | 146 | } |
147 | ||
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148 | static void score_counter_create(void) { |
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149 | AscSceneNode *node = asc_text( |
114 | 150 | .name = "Score Counter", |
151 | .x = 10, .y = 10, | |
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152 | .text = "Score: 0", |
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153 | .color = ASC_RGB(0, 255, 0), |
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154 | .font = asc_font(ASC_FONT_BOLD, 16), |
70 | 155 | ); |
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156 | asc_ui_add_node(node); |
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157 | } |
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158 | |
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159 | static void player_move(AscBehavior *behavior) { |
206 | 160 | AscSceneNode *node = behavior->node; |
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161 | Player *player = node->user_data; |
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162 | |
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163 | // check if the position is set programmatically |
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164 | if (player->reset_position) { |
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165 | asc_scene_node_set_position2f(node, |
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166 | ASC_VEC2F( |
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167 | game_field_tile_size * player->new_position.x, |
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168 | game_field_tile_size * player->new_position.y)); |
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169 | player->reset_position = false; |
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170 | return; |
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171 | } |
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172 | |
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173 | // normal movement |
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174 | const int ts = (int) game_field_tile_size; |
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175 | const float fts = (float) ts; |
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176 | const float speed = fts * player->speed * asc_context.frame_factor; |
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177 | const asc_vec2i dir = directions[player->direction]; |
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178 | const asc_vec2f movement = asc_vec2f_scale(asc_vec2_itof(dir), speed); |
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179 | // check if we are supposed to change the direction |
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180 | if (player->direction == player->target_direction) { |
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181 | // move without changing the direction |
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182 | asc_scene_node_move2f(node, movement); |
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183 | } else { |
217
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184 | // determine axis |
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185 | // and check if we are about to cross the center |
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186 | // this relies on positive positions! |
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187 | bool rotate = false; |
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188 | if (movement.x == 0) { |
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189 | // vertical movement |
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190 | const int y0 = (int)node->position.y / ts; |
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191 | const int y1 = (int)(node->position.y+movement.y) / ts; |
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192 | rotate = y0 != y1 && asc_sgn(y1-y0) == dir.y; |
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193 | } else { |
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194 | // horizontal movement |
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195 | const int x0 = (int)node->position.x / ts; |
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196 | const int x1 = (int)(node->position.x+movement.x) / ts; |
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197 | rotate = x0 != x1 && asc_sgn(x1-x0) == dir.x; |
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198 | } |
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199 | if (rotate) { |
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200 | // snap position to the center of the tile |
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201 | node->position.x = roundf(node->position.x / fts) * fts; |
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202 | node->position.y = roundf(node->position.y / fts) * fts; |
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203 | player->direction = player->target_direction; |
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204 | asc_scene_node_set_rotation(node, rotations[player->direction]); |
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205 | } else { |
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206 | // changing the direction not permitted, yet, continue movement |
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207 | asc_scene_node_move2f(node, movement); |
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208 | } |
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209 | } |
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210 | } |
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211 | |
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212 | static void player_position(Player *pl, int x, int y) { |
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213 | pl->new_position.x = x; |
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214 | pl->new_position.y = y; |
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215 | pl->reset_position = true; |
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216 | } |
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217 | |
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218 | static Player *player_create(void) { |
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219 | AscSceneNode *sprite = asc_sprite( |
114 | 220 | .name = "Player", |
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221 | .texture = TEXTURE_PLAYER, |
213 | 222 | .width = game_field_tile_size, |
223 | .height = game_field_tile_size, | |
224 | .origin_x = game_field_tile_size / 2, | |
225 | .origin_y = game_field_tile_size / 2, | |
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226 | ); |
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227 | asc_scene_add_node(MAIN_SCENE, sprite); |
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228 | Player *player = asc_scene_node_allocate_data(sprite, sizeof(Player)); |
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229 | player_position(player, 12, 8); |
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230 | player->speed = 2.f; // start with 2 tiles/sec |
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231 | asc_behavior_add(sprite, player_move); |
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232 | return player; |
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233 | } |
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234 | |
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235 | static void gamefield_create() { |
213 | 236 | // TODO: create a proper data structure and a more interesting map than just a basic grid |
237 | AscSceneNode *gamefield = asc_scene_node_empty(); | |
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238 | for (unsigned x = 1; x <= game_field_size; x++) { |
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239 | for (unsigned y = 1; y <= game_field_size; y++) { |
213 | 240 | AscSceneNode *tile = asc_rectangle( |
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241 | .x = x*game_field_tile_size, .y = y*game_field_tile_size, .filled = true, .thickness = 1, |
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242 | .origin_x = game_field_tile_size / 2, .origin_y = game_field_tile_size / 2, |
213 | 243 | .width = game_field_tile_size, .height = game_field_tile_size, |
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244 | .color = ASC_RGB(0, 128, 255), |
213 | 245 | .border_color = ASC_RGB(64, 196, 255), |
246 | ); | |
247 | asc_scene_node_link(gamefield, tile); | |
248 | } | |
249 | } | |
250 | asc_scene_node_set_zindex(gamefield, -2); | |
251 | asc_scene_add_node(MAIN_SCENE, gamefield); | |
252 | } | |
253 | ||
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254 | static asc_rect main_scene_viewport_update(asc_vec2u window_size) { |
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255 | |
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256 | // margins |
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257 | const unsigned margin = 16; |
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258 | |
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259 | // space for score, power-ups, etc. |
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260 | const unsigned left_area = (unsigned) (asc_active_window->ui_scale*HUD_WIDTH); |
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261 | |
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262 | // calculate how many pixels need to be removed from width and height |
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263 | const unsigned rw = 2*margin + left_area; |
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264 | const unsigned rh = 2*margin; |
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265 | |
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266 | // check if there is still a viewport left and chicken out when not |
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267 | if (window_size.width < rw || window_size.height < rh) { |
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268 | return ASC_RECT(0, 0, 0, 0); |
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269 | } |
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270 | window_size.width -= rw; |
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271 | window_size.height -= rh; |
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272 | |
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273 | // Compute scaling and offsets |
105 | 274 | unsigned viewport_size, offset_x = 0, offset_y = 0; |
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275 | if (window_size.width > window_size.height) { |
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276 | // Wider window: letterbox (black bars on top/bottom) |
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277 | offset_x = (window_size.width - window_size.height) / 2; |
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278 | viewport_size = window_size.height; |
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279 | } else { |
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280 | // Taller window: pillarbox (black bars on sides) |
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281 | offset_y = (window_size.height - window_size.width) / 2; |
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282 | viewport_size = window_size.width; |
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283 | } |
229
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284 | offset_x += left_area + margin; |
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285 | offset_y += margin; |
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286 | |
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287 | // Set the viewport to the scaled and centered region |
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288 | return ASC_RECT(offset_x, offset_y, viewport_size, viewport_size); |
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289 | } |
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290 | |
105 | 291 | int main(void) { |
0 | 292 | asc_context_initialize(); |
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293 | if (asc_has_error()) { |
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294 | SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, |
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295 | "Fatal Error",asc_get_error(), NULL); |
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296 | return 1; |
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297 | } |
0 | 298 | |
206 | 299 | // initialize globals |
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300 | globals_init(); |
206 | 301 | |
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302 | // create the window |
0 | 303 | AscWindowSettings settings; |
304 | asc_window_settings_init_defaults(&settings); | |
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305 | asc_window_initialize(0, &settings); |
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306 | asc_window_set_title(0, "Snake"); |
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307 | asc_window_set_size(0, asc_vec2_ftou( |
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308 | asc_vec2f_scale(ASC_VEC2F(1024+HUD_WIDTH, 1024), asc_ui_scale_auto()))); |
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309 | asc_window_center(0); |
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310 | |
101 | 311 | // load textures |
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312 | textures_init(); |
101 | 313 | |
314 | // initialize the scenes | |
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315 | asc_scene_init(BACKDROP_SCENE, "backdrop", |
101 | 316 | .type = ASC_CAMERA_ORTHO, |
317 | .projection_update_func = asc_camera_ortho_update_size | |
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318 | ); |
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319 | asc_scene_init(MAIN_SCENE, "main", |
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320 | .type = ASC_CAMERA_ORTHO, |
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321 | .ortho.rect = ASC_RECT(0, 0, |
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322 | (game_field_size+1)*game_field_tile_size, |
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323 | (game_field_size+1)*game_field_tile_size |
213 | 324 | ), |
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325 | .viewport_clear = true, |
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326 | .clear_color = ASC_RGB(0, 128, 90), |
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327 | .viewport_update_func = main_scene_viewport_update |
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328 | ); |
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329 | |
101 | 330 | // backdrop for letterbox/pillarbox |
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331 | backdrop_create(); |
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332 | |
213 | 333 | // the game field |
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334 | gamefield_create(); |
213 | 335 | |
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336 | // create UI elements |
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337 | fps_counter_create(); |
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338 | score_counter_create(); |
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339 | |
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340 | // create spaceship |
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341 | Player *spaceship = player_create(); |
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342 | |
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343 | // Main Loop |
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344 | do { |
0 | 345 | // quit application on any error |
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346 | if (asc_has_error()) { |
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347 | SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, |
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348 | "Fatal Error", asc_get_error(), |
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349 | asc_active_window->window); |
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350 | asc_clear_error(); |
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351 | asc_context_quit(); |
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352 | } |
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353 | |
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354 | // player rotation |
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355 | // TODO: queue up to two movement commands (for sharp 90° turns) |
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356 | if (asc_key_pressed(ASC_KEY(LEFT))) { |
206 | 357 | if (spaceship->direction != MOVE_RIGHT) { |
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358 | spaceship->target_direction = MOVE_LEFT; |
206 | 359 | } |
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360 | } |
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361 | if (asc_key_pressed(ASC_KEY(RIGHT))) { |
206 | 362 | if (spaceship->direction != MOVE_LEFT) { |
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363 | spaceship->target_direction = MOVE_RIGHT; |
206 | 364 | } |
365 | } | |
366 | if (asc_key_pressed(ASC_KEY(UP))) { | |
367 | if (spaceship->direction != MOVE_DOWN) { | |
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368 | spaceship->target_direction = MOVE_UP; |
206 | 369 | } |
370 | } | |
371 | if (asc_key_pressed(ASC_KEY(DOWN))) { | |
372 | if (spaceship->direction != MOVE_UP) { | |
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373 | spaceship->target_direction = MOVE_DOWN; |
206 | 374 | } |
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375 | } |
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376 | |
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377 | // debug-key for clearing the shader registry |
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378 | if (asc_key_pressed(ASC_KEY(S))) { |
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379 | asc_shader_clear_registry(); |
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380 | asc_dprintf("Shader cache cleared."); |
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381 | } |
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382 | |
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383 | // quit application on ESC key press |
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384 | if (asc_key_pressed(ASC_KEY(ESCAPE))) { |
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385 | asc_context_quit(); |
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386 | } |
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387 | } while (asc_loop_next()); |
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388 | |
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389 | // cleanup |
0 | 390 | asc_context_destroy(); |
391 | return 0; | |
392 | } | |
393 |