feat: generate demo gifs for all languages

.gitignore

@@ -1 +1,2 @@
 **/raylib_*
+demo_gen

Makefile

@@ -0,0 +1,12 @@
+# used to generate the demos for all languages
+
+demo_gen: _tools/demo_gen.c
+	gcc -Wall -Wextra -pedantic -I./_raylib-5.5_linux_amd64/include $^ -o $@ -L./_raylib-5.5_linux_amd64/lib -l:libraylib.a -lm
+
+.PHONY: run
+run: demo_gen
+	./demo_gen
+
+.PHONY: clean
+clean:
+	rm -f ./**/raylib* ./demo_gen

_tools/demo_gen.c

@@ -0,0 +1,149 @@
+#include <raylib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <glob.h>
+#include <sys/stat.h>
+
+#define WINDOW_WIDTH  800
+#define WINDOW_HEIGHT 600
+#define LOGO_HEIGHT   64
+#define LOGO_SPEED    300.0f
+#define GIF_FPS       20
+
+static unsigned int hash_str(const char *s) {
+    unsigned int h = 5381;
+    while (*s) h = h * 33 ^ (unsigned char)*s++;
+    return h;
+}
+
+static void generate_gif(const char *output_gif, const char **logo_paths, int logo_count, float switch_secs, int duration_secs) {
+    if (FileExists(output_gif)) {
+        TraceLog(LOG_INFO, "Skipping %s (already exists)", output_gif);
+        return;
+    }
+
+    TraceLog(LOG_INFO, "Generating %s...", output_gif);
+
+    char tmpdir[] = "/tmp/demo_gen_XXXXXX";
+    if (!mkdtemp(tmpdir)) {
+        perror("mkdtemp");
+        return;
+    }
+
+    Texture2D *textures = (Texture2D *)malloc(logo_count * sizeof(Texture2D));
+    for (int i = 0; i < logo_count; i++) {
+        Image img = LoadImage(logo_paths[i]);
+        ImageResize(&img, img.width * LOGO_HEIGHT / img.height, LOGO_HEIGHT);
+        textures[i] = LoadTextureFromImage(img);
+        UnloadImage(img);
+    }
+
+    RenderTexture2D target = LoadRenderTexture(WINDOW_WIDTH, WINDOW_HEIGHT);
+
+    SetRandomSeed(hash_str(output_gif));
+
+    int cur_logo = 0;
+    float x = GetRandomValue(0, WINDOW_WIDTH  - textures[cur_logo].width);
+    float y = GetRandomValue(0, WINDOW_HEIGHT - textures[cur_logo].height);
+    float vx = LOGO_SPEED * (GetRandomValue(0, 1) ? 1.0f : -1.0f);
+    float vy = LOGO_SPEED * (GetRandomValue(0, 1) ? 1.0f : -1.0f);
+
+    int   total_frames = duration_secs * GIF_FPS;
+    float frame_dt     = 1.0f / GIF_FPS;
+    float logo_timer   = 0.0f;
+
+    for (int f = 0; f < total_frames; f++) {
+        Texture2D tex = textures[cur_logo];
+
+        x += vx * frame_dt;
+        y += vy * frame_dt;
+
+        if (x < 0 || x + tex.width >= WINDOW_WIDTH) {
+            vx *= -1.0f;
+            x  += vx * frame_dt;
+        }
+        if (y < 0 || y + tex.height >= WINDOW_HEIGHT) {
+            vy *= -1.0f;
+            y  += vy * frame_dt;
+        }
+
+        logo_timer += frame_dt;
+        if (logo_timer >= switch_secs) {
+            logo_timer = 0.0f;
+            cur_logo   = (cur_logo + 1) % logo_count;
+        }
+
+        BeginTextureMode(target);
+        ClearBackground(BLACK);
+        DrawTextureV(tex, (Vector2){x, y}, WHITE);
+        EndTextureMode();
+
+        Image frame_img = LoadImageFromTexture(target.texture);
+        ImageFlipVertical(&frame_img);
+
+        ExportImage(frame_img, TextFormat("%s/frame_%04d.png", tmpdir, f));
+        UnloadImage(frame_img);
+
+        TraceLog(LOG_INFO, "  frame %d/%d", f + 1, total_frames);
+    }
+
+    UnloadRenderTexture(target);
+    for (int i = 0; i < logo_count; i++) UnloadTexture(textures[i]);
+    free(textures);
+
+    if (system(TextFormat(
+        "ffmpeg -y -framerate %d -i '%s/frame_%%04d.png' "
+        "-vf 'fps=%d,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse' "
+        "'%s' 2>/dev/null",
+        GIF_FPS, tmpdir, GIF_FPS, output_gif)) != 0)
+        TraceLog(LOG_ERROR, "ffmpeg failed for %s", output_gif);
+
+    system(TextFormat("rm -rf '%s'", tmpdir));
+}
+
+static void extract_dir(const char *logo_path, char *out, int maxlen) {
+    const char *slash = strchr(logo_path, '/');
+    if (slash) {
+        int len = (int)(slash - logo_path);
+        if (len >= maxlen) len = maxlen - 1;
+        strncpy(out, logo_path, len);
+        out[len] = '\0';
+    } else {
+        strncpy(out, logo_path, maxlen - 1);
+        out[maxlen - 1] = '\0';
+    }
+}
+
+int main(void) {
+    SetConfigFlags(FLAG_WINDOW_HIDDEN);
+    InitWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "demo_gen");
+
+    glob_t gl;
+    if (glob("*/*_logo.png", 0, NULL, &gl) != 0) {
+        TraceLog(LOG_ERROR, "No logos found. Run from project root.");
+        CloseWindow();
+        return 1;
+    }
+
+    mkdir("docs", 0755);
+
+    // generate docs/demo.gif (cycles all logos)
+    generate_gif("docs/demo.gif", (const char **)gl.gl_pathv, (int)gl.gl_pathc, 1.0f, (int)gl.gl_pathc);
+
+    // generate languages/**/demo.gif
+    for (size_t i = 0; i < gl.gl_pathc; i++) {
+        char dir[256];
+        extract_dir(gl.gl_pathv[i], dir, sizeof(dir));
+
+        const char *path = gl.gl_pathv[i];
+        char* output_path = strdup(TextFormat("%s/demo.gif", dir));
+        generate_gif(output_path, &path, 1, 9999.0f, 4);
+
+        free(output_path);
+    }
+
+    CloseWindow();
+    globfree(&gl);
+    return 0;
+}