Add game

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/CrocParty.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module classpath="CMake" type="CPP_MODULE" version="4" />

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$" />
+  <component name="CidrRootsConfiguration">
+    <libraryRoots>
+      <file path="$PROJECT_DIR$/vendored" />
+      <file path="$PROJECT_DIR$/vendored/sdl" />
+    </libraryRoots>
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/CrocParty.iml" filepath="$PROJECT_DIR$/.idea/CrocParty.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.27)
+project(CrocParty C)
+
+set(CMAKE_C_STANDARD 11)
+
+add_subdirectory(vendored/sdl EXCLUDE_FROM_ALL)
+add_executable(CrocParty main.c
+        sdl_host.c
+        sdl_host.h
+        game.c
+        game.h
+        device.c
+        device.h
+)
+target_link_libraries(CrocParty PRIVATE SDL2::SDL2-static)

device.c

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+#include "device.h"
+
+uint32_t device_pixels[DEVICE_H][DEVICE_W];

device.h

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+#ifndef CROCPARTY_DEVICE_H
+#define CROCPARTY_DEVICE_H
+
+#include <stdint.h>
+
+// 240 x 135 is also cool
+#define DEVICE_W 128
+#define DEVICE_H 128
+
+extern uint32_t device_pixels[DEVICE_H][DEVICE_W];
+
+#endif //CROCPARTY_DEVICE_H

game.c

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+#include "device.h"
+#include "game.h"
+
+uint32_t game_frame;
+
+void game_init() {
+    game_frame = 0;
+}
+
+void game_update() {
+    game_frame += 1;
+}
+
+void game_draw() {
+    for (int x = 0; x < DEVICE_W; x++) {
+        for (int y = 0; y < DEVICE_H; y++) {
+            uint32_t r = (x * 255)/DEVICE_W;
+            uint32_t g = (y * 255)/DEVICE_H;
+            uint32_t b = game_frame & 0xff;
+            if (x % 4 == 2 && y % 4 == 2) {
+                r = 255 - r;
+                g = 255 - g;
+                b = 255 - b;
+            }
+            uint32_t color = r << 24 | g << 16 | b << 8;
+            device_pixels[y][x] = color;
+        }
+    }
+}

game.h

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+#ifndef CROCPARTY_GAME_H
+#define CROCPARTY_GAME_H
+
+void game_init();
+void game_update();
+void game_draw();
+
+#endif //CROCPARTY_GAME_H

main.c

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+#include "sdl_host.h"
+
+int main() {
+    // PYREX NOTE: You could, if you wanted, define another host with the same interface as sdl_host
+    // That would be pretty cool, right?
+    //
+    // (Such a host might be smaller and more platform-specific.)
+    return sdl_host_main();
+}

sdl_host.c

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+#include <stdio.h>
+#include <stdbool.h>
+
+#include "sdl_host.h"
+#include "vendored/sdl/include/SDL.h"
+#include "game.h"
+#include "device.h"
+
+void sdl_host_suggest_dimensions(uint32_t* window_w, uint32_t* window_h);
+void sdl_host_loop();
+
+SDL_Window* sdl_host_window;
+SDL_Renderer* sdl_host_renderer;
+SDL_Texture* sdl_host_target;
+
+int sdl_host_main(void) {
+    int result = 0;
+    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER)) {
+        printf("could not initialize SDL! sdl error: %s\n", SDL_GetError());
+        result = 1;
+        goto sdl_done;
+    }
+
+    uint32_t window_w, window_h;
+    sdl_host_suggest_dimensions(&window_w, &window_h);
+
+    // create window
+    sdl_host_window = SDL_CreateWindow(
+        "Croc Party!",
+        SDL_WINDOWPOS_CENTERED,
+        SDL_WINDOWPOS_CENTERED,
+        (int) window_w, (int) window_h,
+        SDL_WINDOW_SHOWN
+    );
+
+    if (sdl_host_window == NULL) {
+        printf("could not load window! sdl error: %s\n", SDL_GetError());
+        result = 1;
+        goto window_done;
+    }
+
+    // create renderer
+    sdl_host_renderer = SDL_CreateRenderer(sdl_host_window, -1, 0);
+    if (sdl_host_renderer == NULL) {
+        result = 1;
+        goto renderer_done;
+    }
+
+    // create target
+    sdl_host_target = SDL_CreateTexture(
+        sdl_host_renderer,
+        SDL_PIXELFORMAT_RGBA8888,
+        SDL_TEXTUREACCESS_STREAMING,
+        DEVICE_W, DEVICE_H
+    );
+
+    if (sdl_host_target == NULL) {
+        printf("could not create target texture! sdl error: %s\n", SDL_GetError());
+        result = 1;
+        goto target_done;
+    }
+
+    sdl_host_loop();
+
+    // renderer_cleanup:
+    SDL_DestroyRenderer(sdl_host_renderer);
+    sdl_host_renderer = NULL;
+    renderer_done: ;
+
+    // target_cleanup:
+    SDL_DestroyTexture(sdl_host_target);
+    sdl_host_target = NULL;
+    target_done: ;
+
+    // window_cleanup:
+    SDL_DestroyWindow(sdl_host_window);
+    sdl_host_window = NULL;
+    window_done: ;
+
+    // sdl_cleanup:
+    SDL_Quit();
+    sdl_done: ;
+
+    return result;
+}
+
+void sdl_host_suggest_dimensions(uint32_t* window_w, uint32_t* window_h) {
+    SDL_DisplayMode dm;
+    if (SDL_GetCurrentDisplayMode(0, &dm) != 0) {
+        printf("could not get current display mode: %s\n", SDL_GetError());
+        dm.w = 0;
+        dm.h = 0;
+    }
+
+    for (int scalar = 5; scalar >= 1; scalar--) {
+        uint32_t w = DEVICE_W * scalar;
+        uint32_t h = DEVICE_H * scalar;
+        if (w <= dm.w && h <= dm.h) {
+            *window_w = w;
+            *window_h = h;
+            return;
+        }
+    }
+
+    for (int scalar = 1; scalar <= 5; scalar++) {
+        uint32_t w = DEVICE_W / scalar;
+        uint32_t h = DEVICE_H / scalar;
+        if (w <= dm.w && h <= dm.h) {
+            *window_w = w;
+            *window_h = h;
+            return;
+        }
+    }
+
+    *window_w = DEVICE_W;
+    *window_h = DEVICE_H;
+}
+
+void sdl_host_loop() {
+    uint32_t ticks_per_frame = 1000/60;
+
+    game_init();
+    while (true) {
+        uint32_t frame_start = SDL_GetTicks();
+        uint32_t next_frame_start = frame_start + ticks_per_frame;
+
+        SDL_Event e;
+        while (SDL_PollEvent(&e)) {
+            if (e.type == SDL_QUIT) { goto quit; }
+        }
+
+        // trigger game logic
+        game_update();
+        game_draw();
+
+        SDL_UpdateTexture(sdl_host_target, NULL, &device_pixels, sizeof(device_pixels[0]));
+        SDL_RenderClear(sdl_host_renderer);
+        SDL_RenderCopy(sdl_host_renderer, sdl_host_target, NULL, NULL);
+        SDL_RenderPresent(sdl_host_renderer);
+
+        // hold off until next frame
+        while (SDL_GetTicks() < next_frame_start) {
+            SDL_Delay(1);
+        }
+    }
+    quit: ;
+}

sdl_host.h

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+#ifndef CROCPARTY_SDL_HOST_H
+#define CROCPARTY_SDL_HOST_H
+
+int sdl_host_main(void);
+
+#endif //CROCPARTY_SDL_HOST_H