--- a/test/snake/snake.c Mon Aug 18 23:11:50 2025 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,598 +0,0 @@
-/*
- * 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/core.h>
-#include <ascension/ui.h>
-#include <ascension/sprite.h>
-#include <ascension/2d.h>
-#include <ascension/shader.h>
-
-#include <cx/printf.h>
-#include <cx/linked_list.h>
-
-#define TEXTURE_2D_COUNT 3
-static AscTexture tex2d[TEXTURE_2D_COUNT];
-#define TEXTURE_PLAYER &tex2d[0]
-#define TEXTURE_PLAYER_COLOR_MAP &tex2d[1]
-#define TEXTURE_BACKDROP &tex2d[2]
-
-#define SHADER_ID_PLAYER 1
-
-#define BACKDROP_SCENE asc_window_scene(0)
-#define MAIN_SCENE asc_window_scene(1)
-#define HUD_WIDTH 400
-
-enum MoveDirection {
- MOVE_UP,
- MOVE_LEFT,
- MOVE_DOWN,
- MOVE_RIGHT
-};
-
-static asc_transform rotations[4];
-static asc_vec2i directions[4];
-
-typedef struct {
- asc_color color;
- enum MoveDirection direction;
- enum MoveDirection target_direction;
- /**
- * The speed in tiles per second.
- */
- float speed;
- /**
- * A linked list of vec2u elements describing the current trace.
- */
- CxList *trace;
- /**
- * The new position of the player when @c reset_position is @c true.
- */
- asc_vec2i new_position;
- unsigned health;
- bool reset_position;
- uint8_t number;
-} Player;
-
-#define GAME_FIELD_SIZE 32
-#define GAME_FIELD_TILE_SIZE 32
-
-/** The bit in the tile data indicating if the tile exists. */
-#define GAME_FIELD_TILE_EXISTS_FLAG 0x80
-/** The bits in the tile data that identify the owner. */
-#define GAME_FIELD_TILE_OWNER_MASK 0xF
-
-typedef struct {
- AscSceneNode *nodes[GAME_FIELD_SIZE][GAME_FIELD_SIZE];
- int8_t tile_data[GAME_FIELD_SIZE][GAME_FIELD_SIZE];
-} GameField;
-
-
-#define GAME_STATE_MENU 0
-#define GAME_STATE_PLAYING 1
-#define GAME_STATE_GAME_OVER 2
-
-typedef struct {
- int state;
- GameField *field;
- Player *players[4];
-} GameState;
-
-GameState game = {0};
-
-static void globals_init(void) {
- asc_transform_identity(rotations[MOVE_UP]);
- asc_transform_roll(rotations[MOVE_LEFT], asc_rad(-90));
- asc_transform_roll(rotations[MOVE_RIGHT], asc_rad(90));
- asc_transform_roll(rotations[MOVE_DOWN], asc_rad(180));
- directions[MOVE_UP] = ASC_VEC2I(0, -1);
- directions[MOVE_LEFT] = ASC_VEC2I(-1, 0);
- directions[MOVE_DOWN] = ASC_VEC2I(0, 1);
- directions[MOVE_RIGHT] = ASC_VEC2I(1, 0);
-}
-
-static void textures_destroy(void) {
- asc_texture_destroy(tex2d, TEXTURE_2D_COUNT);
-}
-
-static void textures_init(void) {
- asc_texture_init_2d(tex2d, TEXTURE_2D_COUNT);
- asc_texture_from_file(TEXTURE_PLAYER, "player.png");
- asc_texture_from_file(TEXTURE_PLAYER_COLOR_MAP, "player-color-map.png");
- asc_texture_from_file(TEXTURE_BACKDROP, "backdrop.png");
- asc_gl_context_add_cleanup_func(asc_active_glctx, textures_destroy);
-}
-
-static void backdrop_scale(AscBehavior *behavior) {
- // scale the backdrop to the size of the window
- if (!asc_active_window->resized) return;
- asc_ptr_cast(AscSprite, sprite, behavior->node);
- asc_vec2u window_size = asc_active_window->dimensions;
- asc_sprite_set_size(sprite, window_size);
-}
-
-static void main_scene_frame_scale(AscBehavior *behavior) {
- if (!asc_active_window->resized) return;
- asc_ptr_cast(AscRectangle, frame, behavior->node);
- asc_rectangle_set_bounds(frame, MAIN_SCENE->camera.viewport);
-}
-
-static void backdrop_create(void) {
- const float scale = 1.f / asc_active_window->ui_scale;
- AscSceneNode *node = asc_sprite(
- .texture = TEXTURE_BACKDROP,
- .texture_scale_mode = ASC_TEXTURE_SCALE_REPEAT,
- .texture_scale_x = scale, .texture_scale_y = scale,
- );
- asc_behavior_add(node, .func = backdrop_scale);
- asc_scene_add_node(BACKDROP_SCENE, node);
-
- // also add a frame for the main scene
- // add this to the UI layer so that the border size does not scale
- AscSceneNode *frame = asc_rectangle(.thickness = 2, .color = ASC_RGBi(66, 142, 161));
- asc_behavior_add(frame, .func = main_scene_frame_scale);
- asc_ui_add_node(frame);
-}
-
-static void fps_counter_update(AscBehavior *behavior) {
- asc_ptr_cast(AscText, node, behavior->node);
- static float last_fps = 0.f;
- if (fabsf(asc_context.frame_rate - last_fps) > 1) {
- last_fps = asc_context.frame_rate;
- asc_text_printf(node, "%.2f FPS", asc_context.frame_rate);
- }
-}
-
-static void fps_counter_tie_to_corner(AscBehavior *behavior) {
- // TODO: this should be replaced with some sort of UI layout manager
- AscSceneNode *node = behavior->node;
- if (asc_test_flag(node->flags, ASC_SCENE_NODE_GRAPHICS_UPDATED) || asc_active_window->resized) {
- asc_scene_node_set_position2f(node, ASC_VEC2F(10,
- asc_active_window->dimensions.y - ((AscText*)node)->dimension.height - 10
- ));
- }
-}
-
-static AscSceneNode *fps_counter_create(void) {
- AscSceneNode *node = asc_text(
- .name = "FPS Counter",
- .color = ASC_RGB(1, 1, 1),
- .font = asc_font(ASC_FONT_REGULAR, 12),
- );
- asc_behavior_add(node, .func = fps_counter_update, .interval = asc_seconds(1));
- asc_behavior_add(node, fps_counter_tie_to_corner);
- asc_ui_add_node(node);
- return node;
-}
-
-static bool game_field_tile_chown(asc_vec2u coords, Player *player) {
- unsigned x = coords.x, y = coords.y;
- asc_ptr_cast(AscRectangle, tile, game.field->nodes[x][y]);
- int old_owner = game.field->tile_data[x][y] & GAME_FIELD_TILE_OWNER_MASK;
- if (player == NULL) {
- asc_clear_flag(game.field->tile_data[x][y], GAME_FIELD_TILE_OWNER_MASK);
- tile->color = ASC_RGBi(16, 50, 160);
- } else {
- asc_set_flag_masked(game.field->tile_data[x][y], GAME_FIELD_TILE_OWNER_MASK, player->number);
- tile->color = player->color;
- }
- int new_owner = game.field->tile_data[x][y] & GAME_FIELD_TILE_OWNER_MASK;
- return old_owner != new_owner;
-}
-
-static void game_field_create() {
- // TODO: create a more interesting map than just a basic grid
- AscSceneNode *node = asc_scene_node_empty();
- game.field = asc_scene_node_allocate_data(node, sizeof(GameField));
- for (unsigned x = 0; x < GAME_FIELD_SIZE; x++) {
- for (unsigned y = 0; y < GAME_FIELD_SIZE; y++) {
- AscSceneNode *tile = asc_rectangle(
- .x = x*GAME_FIELD_TILE_SIZE, .y = y*GAME_FIELD_TILE_SIZE, .filled = true, .thickness = 2,
- .width = GAME_FIELD_TILE_SIZE, .height = GAME_FIELD_TILE_SIZE,
- .color = ASC_RGBi(16, 50, 160),
- .border_color = ASC_RGBi(20, 84, 128),
- );
-
- game.field->tile_data[x][y] = GAME_FIELD_TILE_EXISTS_FLAG;
- game.field->nodes[x][y] = tile;
-
- asc_scene_node_link(node, tile);
- }
- }
- asc_scene_node_set_zindex(node, -2);
- asc_scene_add_node(MAIN_SCENE, node);
-}
-
-static asc_vec2u game_field_tile_at_position(asc_vec3f position) {
- return ASC_VEC2U((int)position.x / GAME_FIELD_TILE_SIZE, (int)position.y / GAME_FIELD_TILE_SIZE);
-}
-
-typedef struct {
- AscShaderProgram program;
- asc_uniform_loc map_albedo;
- asc_uniform_loc map_color;
- asc_uniform_loc color;
-} PlayerShader;
-
-static void player_shader_init(AscShaderProgram *p, cx_attr_unused int flags) {
- asc_shader_init_uniform_loc_nice(p, PlayerShader, map_albedo);
- asc_shader_init_uniform_loc_nice(p, PlayerShader, map_color);
- asc_shader_init_uniform_loc_nice(p, PlayerShader, color);
-}
-
-static AscShaderProgram *player_shader_create(cx_attr_unused int unused) {
- return asc_shader_create((AscShaderCodes) {
- .vtx = {.source_file = "sprite_vtx.glsl"},
- .frag = {.source_file = "player.glsl",},
- }, sizeof(PlayerShader), player_shader_init, 0);
-}
-
-static void player_draw(const AscCamera *camera, const AscSceneNode *node) {
- asc_cptr_cast(AscSprite, sprite, node);
- const Player *player = node->user_data;
-
- // TODO: we shall finally add the shader information to the node
- const AscShaderProgram *s = asc_shader_lookup(
- SHADER_ID_PLAYER, player_shader_create, 0
- );
- if (asc_shader_use(s, camera)) return;
- asc_cptr_cast(PlayerShader, shader, s);
-
- asc_shader_upload_model_matrix(s, node);
-
- // Bind texture
- asc_texture_bind(TEXTURE_PLAYER, shader->map_albedo, 0);
- asc_texture_bind(TEXTURE_PLAYER_COLOR_MAP, shader->map_color, 1);
- asc_shader_upload_color(shader->color, player->color);
- asc_mesh_draw_triangle_strip(&sprite->mesh);
-}
-
-static void player_set_health(Player *player, unsigned health) {
- player->health = health;
- // TODO: probably we want to add more effects when the health changes
-}
-
-static unsigned player_get_health(Player *player) {
- return player->health;
-}
-
-static void player_move(AscBehavior *behavior) {
- AscSceneNode *node = behavior->node;
- Player *player = node->user_data;
-
- // TODO: instead of skipping this behavior, it should be disabled when health is zero
- if (player_get_health(player) == 0) return;
-
- // TODO: move this to a different behavior
- asc_scene_node_show(node);
-
- const float ts = (float) GAME_FIELD_TILE_SIZE;
-
- // check if the position is set programmatically
- if (player->reset_position) {
- asc_scene_node_set_position2f(node,
- ASC_VEC2F(
- ts * (player->new_position.x + .5f),
- ts * (player->new_position.y + .5f)
- ));
- player->reset_position = false;
- return;
- }
-
- // normal movement
- const float speed = ts * player->speed * asc_context.frame_factor;
- const asc_vec2i dir = directions[player->direction];
- const asc_vec2f movement = asc_vec2f_scale(asc_vec2_itof(dir), speed);
-
- // check if we are supposed to change the direction
- if (player->direction == player->target_direction) {
- // move without changing the direction
- asc_scene_node_move2f(node, movement);
- } else {
- // determine axis
- // and check if we are about to cross the center
- // this relies on positive positions!
- bool rotate = false;
- if (movement.x == 0) {
- // vertical movement
- const float y_0 = floorf(node->position.y / ts);
- const float y_curr = node->position.y / ts - y_0;
- const float y_next = (node->position.y+movement.y) / ts - y_0;
- const bool side_curr = y_curr > 0.5f;
- const bool side_next = y_next > 0.5f;
- rotate = side_curr ^ side_next;
- } else {
- // horizontal movement
- const float x0 = floorf(node->position.x / ts);
- const float x_curr = node->position.x / ts - x0;
- const float x_next = (node->position.x+movement.x) / ts - x0;
- const bool side_curr = x_curr > 0.5f;
- const bool side_next = x_next > 0.5f;
- rotate = side_curr ^ side_next;
- }
- if (rotate) {
- // snap position to the center of the tile
- asc_scene_node_set_position2f(node,
- ASC_VEC2F(
- (.5f+floorf(node->position.x / ts)) * ts,
- (.5f+floorf(node->position.y / ts)) * ts
- ));
- player->direction = player->target_direction;
- asc_scene_node_set_rotation(node, rotations[player->direction]);
- } else {
- // changing the direction not permitted, yet, continue movement
- asc_scene_node_move2f(node, movement);
- }
- }
-
- // die when leaving the game field
- if (node->position.x < 0 || node->position.y < 0 ||
- node->position.x > GAME_FIELD_SIZE*GAME_FIELD_TILE_SIZE ||
- node->position.y > GAME_FIELD_SIZE*GAME_FIELD_TILE_SIZE) {
- // TODO: add fancy death animation
- asc_scene_node_hide(node);
- player_set_health(player, 0);
- // TODO: remove the trace gradually (dequeuing the trace should be a different behavior)
- cxListClear(player->trace);
- game.state = GAME_STATE_GAME_OVER;
- return;
- }
-
- // TODO: collision detection
-
- // update the trace, if necessary.
- // remark: some calculations are repeated here, but they are cheap enough
- {
- const asc_vec2u tile_coords = game_field_tile_at_position(node->position);
- // TODO: player should have been destroyed before leaving the field
- if (tile_coords.x > GAME_FIELD_SIZE || tile_coords.y > GAME_FIELD_SIZE) return;
- if (game_field_tile_chown(tile_coords, player)) {
- // new owner of the tile!
- asc_vec2u p = tile_coords;
- cxListAdd(player->trace, &p);
- if (cxListSize(player->trace) > 7) {
- // TODO: implement power-up which makes the trace longer
- cxListRemove(player->trace, 0);
- }
- }
- }
-}
-
-static void player_controls(Player *player) {
- if (asc_key_pressed(ASC_KEY(LEFT))) {
- if (player->direction != MOVE_RIGHT) {
- player->target_direction = MOVE_LEFT;
- }
- }
- if (asc_key_pressed(ASC_KEY(RIGHT))) {
- if (player->direction != MOVE_LEFT) {
- player->target_direction = MOVE_RIGHT;
- }
- }
- if (asc_key_pressed(ASC_KEY(UP))) {
- if (player->direction != MOVE_DOWN) {
- player->target_direction = MOVE_UP;
- }
- }
- if (asc_key_pressed(ASC_KEY(DOWN))) {
- if (player->direction != MOVE_UP) {
- player->target_direction = MOVE_DOWN;
- }
- }
-}
-
-static void player_position(Player *pl, int x, int y) {
- pl->new_position.x = x;
- pl->new_position.y = y;
- pl->reset_position = true;
-}
-
-static void player_destroy(CxAllocator *allocator, Player *player) {
- cxListFree(player->trace);
- cxFree(allocator, player);
-}
-
-static void player_trace_release_tile(asc_vec2u *coords) {
- game_field_tile_chown(*coords, NULL);
-}
-
-static Player *player_create(void) {
- AscSceneNode *node = asc_sprite(
- .name = "Player",
- .width = GAME_FIELD_TILE_SIZE,
- .height = GAME_FIELD_TILE_SIZE,
- .origin_x = GAME_FIELD_TILE_SIZE / 2,
- .origin_y = GAME_FIELD_TILE_SIZE / 2,
- );
- asc_scene_add_node(MAIN_SCENE, node);
- Player *player = asc_scene_node_allocate_data(node, sizeof(Player));
- player_position(player, 12, 8);
- player->speed = 3.f; // start with 3 tiles/sec
- player->number = 1;
- player->health = 100;
- player->color = ASC_RGB(1, 0, 0);
- player->trace = cxLinkedListCreateSimple(sizeof(asc_vec2u));
- cxDefineDestructor(player->trace, player_trace_release_tile);
- node->draw_func = player_draw;
- node->user_data_free_func = (cx_destructor_func2)player_destroy;
- asc_behavior_add(node, player_move);
- return player;
-}
-
-static asc_rect main_scene_viewport_update(asc_vec2u window_size) {
-
- // margins
- const unsigned margin = 16;
-
- // space for score, power-ups, etc.
- const unsigned left_area = (unsigned) (asc_active_window->ui_scale*HUD_WIDTH);
-
- // calculate how many pixels need to be removed from width and height
- const unsigned rw = 2*margin + left_area;
- const unsigned rh = 2*margin;
-
- // check if there is still a viewport left and chicken out when not
- if (window_size.width < rw || window_size.height < rh) {
- return ASC_RECT(0, 0, 0, 0);
- }
- window_size.width -= rw;
- window_size.height -= rh;
-
- // Compute scaling and offsets
- unsigned viewport_size, offset_x = 0, offset_y = 0;
- if (window_size.width > window_size.height) {
- // Wider window: letterbox (black bars on top/bottom)
- offset_x = (window_size.width - window_size.height) / 2;
- viewport_size = window_size.height;
- } else {
- // Taller window: pillarbox (black bars on sides)
- offset_y = (window_size.height - window_size.width) / 2;
- viewport_size = window_size.width;
- }
- offset_x += left_area + margin;
- offset_y += margin;
-
- // Set the viewport to the scaled and centered region
- return ASC_RECT(offset_x, offset_y, viewport_size, viewport_size);
-}
-
-int main(void) {
- asc_context_initialize();
- if (asc_has_error()) {
- SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
- "Fatal Error",asc_get_error(), NULL);
- return 1;
- }
-
- // initialize globals
- globals_init();
-
- // create the window
- asc_window_initialize(0, asc_gl_context_settings_default(4, 0));
- asc_window_set_title(0, "Snake");
- asc_window_set_size(0, asc_vec2_ftou(
- asc_vec2f_scale(ASC_VEC2F(1000+HUD_WIDTH, 1000), asc_ui_scale_auto())));
- asc_window_center(0);
-
- // load textures
- textures_init();
-
- // initialize backdrop scene
- asc_scene_init(BACKDROP_SCENE, "backdrop",
- .type = ASC_CAMERA_ORTHO,
- .projection_update_func = asc_camera_ortho_update_size
- );
- backdrop_create();
-
- // Initialize main scene
- asc_scene_init(MAIN_SCENE, "main",
- .type = ASC_CAMERA_ORTHO,
- .ortho.rect = ASC_RECT(
- -GAME_FIELD_TILE_SIZE,
- -GAME_FIELD_TILE_SIZE,
- (GAME_FIELD_SIZE+2)*GAME_FIELD_TILE_SIZE,
- (GAME_FIELD_SIZE+2)*GAME_FIELD_TILE_SIZE
- ),
- .viewport_clear = true,
- .clear_color = ASC_RGBi(0, 32, 16),
- .viewport_update_func = main_scene_viewport_update
- );
-
- // create the fps counter
- AscSceneNode *fps_counter = fps_counter_create();
- asc_scene_node_hide(fps_counter);
-
- // create game over text
- AscSceneNode *text_game_over = asc_text(
- .name = "game_over_text",
- .text = "Game Over\nPress R to Restart",
- .color = ASC_RGB(1, 1, 1),
- .font = asc_font(ASC_FONT_REGULAR, 36),
- .alignment = ASC_TEXT_ALIGN_CENTER,
- .centered = true,
- .x = (GAME_FIELD_SIZE+2)*GAME_FIELD_TILE_SIZE/2,
- .y = (GAME_FIELD_SIZE+2)*GAME_FIELD_TILE_SIZE/2 - 60,
- );
- asc_scene_node_hide(text_game_over);
- // TODO: add as a UI node and add a behavior which centers the node in the main scenes viewport
- // otherwise we won't be able to implement a moving camera in the future
- asc_scene_add_node(MAIN_SCENE, text_game_over);
-
- // initialize the game state
- // TODO: add a main menu and start with the menu
- game.state = GAME_STATE_PLAYING;
- game.players[0] = player_create();
- game_field_create();
-
- // Main Loop
- do {
- // quit application on any error
- if (asc_has_error()) {
- SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
- "Fatal Error", asc_get_error(),
- asc_active_window->window);
- asc_clear_error();
- asc_context_quit();
- }
-
- // game states
- // TODO: move all this into behaviors
- if (game.state == GAME_STATE_PLAYING) {
- // TODO: implement hot seat 1on1 multiplayer
- player_controls(game.players[0]);
- } else if (game.state == GAME_STATE_GAME_OVER) {
- asc_scene_node_show(text_game_over);
- if (asc_key_pressed(ASC_KEY(R))) {
- // TODO: re-load the "level"
- player_position(game.players[0], 12, 8);
- player_set_health(game.players[0], 100);
- game.state = GAME_STATE_PLAYING;
- asc_scene_node_hide(text_game_over);
- }
- }
-
- // debug-key for clearing the shader registry
- if (asc_key_pressed(ASC_KEY(S))) {
- asc_shader_clear_registry();
- asc_dprintf("Shader cache cleared.");
- }
-
- // show/hide the FPS counter
- if (asc_key_pressed(ASC_KEY(F2))) {
- asc_scene_node_toggle_visibility(fps_counter);
- }
-
- // quit application on ESC key press
- if (asc_key_pressed(ASC_KEY(ESCAPE))) {
- asc_context_quit();
- }
- } while (asc_loop_next());
-
- // cleanup
- asc_context_destroy();
- return 0;
-}
-