feat!: Moving checker pattern

1 files changed, 94 insertions, 0 deletions

diff --git a/graphics.c b/graphics.c
new file mode 100644
index 0000000..df10685
--- /dev/null
+++ b/graphics.c
@@ -0,0 +1,94 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+inline int
+OK(int x) {
+	return x == 0;
+}
+
+////RGBImage////
+
+typedef uint8_t  byte;
+typedef uint16_t byte2;
+typedef uint32_t byte4;
+
+typedef struct _RGB {
+	byte r;
+	byte g;
+	byte b;
+} RGB;
+
+void
+ARGB_set(RGB* rgb, byte4 color) {
+	rgb->r = (0xFF0000 & color) >> 16;
+	rgb->g = (0x00FF00 & color) >> 8;
+	rgb->b = (0x0000FF & color);
+}
+
+typedef struct _RGBImage {
+	int width;
+	int height;
+	RGB* img;
+} RGBImage;
+
+RGBImage
+RGBImage_new(int width, int height) {
+	return (RGBImage){
+		.width  = width,
+		.height = height,
+		.img    = malloc(sizeof(RGB) * width * height)
+	};
+}
+
+void
+RGBImage_free(RGBImage img) {
+	free(img.img);
+}
+
+void
+RGBImage_delete(RGBImage* img) {
+	RGBImage_free(*img);
+	img->width = img->height = 0;
+	img->img = NULL;
+}
+
+RGB*
+RGBImage_at(RGBImage img, int row, int col) {
+	return img.img + (row % img.height) * img.width + col % img.width;
+}
+
+int
+ppm6_write(FILE* f, RGBImage img) {
+	fprintf(f, "P6\n%d %d\n255\n", img.width, img.height);
+	fwrite(img.img, sizeof(*img.img), img.width * img.height, f);
+	return fflush(f);
+}
+
+////main////
+
+int
+main() {
+	RGBImage frame = RGBImage_new(512, 512);
+
+	for (int frameIndex = 0; frameIndex < 120; ++frameIndex) {
+
+		for (int r = 0; r < frame.width; ++r)
+		for (int c = 0; c < frame.height; ++c) {
+			RGB* pixel = RGBImage_at(frame, r, c);
+
+			if (((r + frameIndex) / 32 + (c + frameIndex) / 32) % 2 == 0) {
+				ARGB_set(pixel, 0x000000);
+			}
+			else {
+				ARGB_set(pixel, 0xFF00FF);
+			}
+		}
+
+		ppm6_write(stdout, frame);
+	}
+
+	RGBImage_delete(&frame);
+
+	return 0;
+}