56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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static uint32_t rng_state = 2463534242u;
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float randf() {
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rng_state ^= rng_state << 13;
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rng_state ^= rng_state >> 17;
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rng_state ^= rng_state << 5;
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uint32_t bits = (rng_state >> 9) | 0x3F800000u;
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float f;
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__builtin_memcpy(&f, &bits, sizeof f);
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return f - 1.0f;
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}
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static FILE* ppm_file;
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static int pixel_count;
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static int pixels_per_line;
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static int max_lines;
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static int line_count;
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void ppm_start(int width, int height) {
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ppm_file = fopen("image.ppm", "w");
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if (ppm_file == NULL) exit(-1);
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fprintf(ppm_file, "P3\n%d %d\n 255\n", width, height);
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max_lines = height;
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pixels_per_line = width;
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pixel_count = 0;
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line_count = 0;
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}
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void ppm_pixel(int r, int g, int b) {
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if (ppm_file == NULL) exit(-1);
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fprintf(ppm_file, "%d %d %d\n", r, g, b);
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pixel_count++;
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if (pixel_count == pixels_per_line) {
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pixel_count = 0;
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line_count++;
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printf("Progress: %d / %d\r", line_count, max_lines);
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fflush(stdout);
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}
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}
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void ppm_finish() {
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fflush(ppm_file);
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fclose(ppm_file);
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ppm_file = NULL;
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printf("\33[2K\rDone!\n");
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}
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