feat: play around with the raytracer

2026-04-23 17:30:35 +02:00
parent 0a74262cee
commit c4999b0450
4 changed files with 2074157 additions and 0 deletions
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+static uint32_t rng_state = 2463534242u;
+
+float randf() {
+    rng_state ^= rng_state << 13;
+    rng_state ^= rng_state >> 17;
+    rng_state ^= rng_state << 5;
+    uint32_t bits = (rng_state >> 9) | 0x3F800000u;
+    float f;
+    __builtin_memcpy(&f, &bits, sizeof f);
+    return f - 1.0f;
+}
+
+static FILE* ppm_file;
+static int pixel_count;
+static int pixels_per_line;
+static int max_lines;
+static int line_count;
+
+void ppm_start(int width, int height) {
+    ppm_file = fopen("image.ppm", "w");
+    if (ppm_file == NULL) exit(-1);
+
+    fprintf(ppm_file, "P3\n%d %d\n 255\n", width, height);
+    max_lines = height;
+    pixels_per_line = width;
+    pixel_count = 0;
+    line_count = 0;
+}
+
+void ppm_pixel(int r, int g, int b) {
+    if (ppm_file == NULL) exit(-1);
+
+    fprintf(ppm_file, "%d %d %d\n", r, g, b);
+    pixel_count++;
+
+    if (pixel_count == pixels_per_line) {
+        pixel_count = 0;
+        line_count++;
+
+        printf("Progress: %d / %d\r", line_count, max_lines);
+        fflush(stdout);
+    }
+}
+
+void ppm_finish() {
+    fflush(ppm_file);
+    fclose(ppm_file);
+
+    ppm_file = NULL;
+    printf("\33[2K\rDone!\n");
+}