From 403730174aeaadcf7a8aad842bc5319050411ef9 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sun, 16 Nov 2025 18:23:37 -0800
Subject: Initial commit

---
 test/test.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 test/test.c

(limited to 'test/test.c')

diff --git a/test/test.c b/test/test.c
new file mode 100644
index 0000000..668dec8
--- /dev/null
+++ b/test/test.c
@@ -0,0 +1,88 @@
+#include <swgfx.h>
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+typedef struct RGB { uint8_t r, g, b; } RGB;
+
+static bool WritePPM(int width, int height, const RGB* image, const char* path) {
+  const size_t num_pixels = width * height;
+  
+  FILE* file = fopen(path, "wb");
+  if (!file) {
+    return false;
+  }
+  
+  fprintf(file, "P6\n%d %d\n255\n", width, height);
+  if (fwrite(image, sizeof(RGB), num_pixels, file) != num_pixels) {
+    fclose(file);
+    return false;
+  }
+  
+  fclose(file);
+  return true;
+}
+
+void ToRGB(int width, int height, const sgPixel* rgba, RGB* rgb) {
+  assert(rgba);
+  assert(rgb);
+  for (int y = 0; y < height; ++y) {
+    for (int x = 0; x < width; ++x) {
+      const sgPixel p = *rgba++;
+      *rgb++ = (RGB){p.r, p.g, p.b};
+    }
+  }
+}
+
+static void Checkerboard(swgfx* gfx, int width, int height) {
+  assert(gfx);
+  const sgPixel colour = (sgPixel){255, 0, 255, 255};
+  for (int y = 0; y < height; ++y) {
+    for (int x = 0; x < width; ++x) {
+      if (((x ^ y) & 1) == 1) {
+        const sgVec2i position = (sgVec2i){x, y};
+        sgPixels(gfx, 1, &position, colour);
+      }
+    }
+  }
+}
+
+static void TestTriangle(swgfx* gfx) {
+  assert(gfx);
+  
+  const int     BufferWidth  = 160;
+  const int     BufferHeight = 120;
+  const int     N            = BufferWidth * BufferHeight;
+  const sgVec2i BufferDims   = (sgVec2i){.x = BufferWidth, .y = BufferHeight};
+  
+  sgPixel colour[N];
+  RGB     rgb[N];
+  
+  sgColourBuffer(gfx, BufferDims, colour);
+  sgClear(gfx);
+  Checkerboard(gfx, BufferWidth, BufferHeight);
+  
+  const sgVec2 p0  = (sgVec2){20, 20};
+  const sgVec2 p1  = (sgVec2){80, 20};
+  const sgVec2 p2  = (sgVec2){50, 50};
+  const sgTri2 tri = (sgTri2){p0, p1, p2};
+  sgTriangles2(gfx, 1, &tri);
+  
+  ToRGB(BufferWidth, BufferHeight, colour, rgb);
+  WritePPM(BufferWidth, BufferHeight, rgb, "triangle.ppm");
+}
+
+int main() {
+  swgfx* gfx = 0;
+  if (!(gfx = sgNew())) {
+    fprintf(stderr, "Failed to create swgfx\n");
+    return 1;
+  }
+  
+  TestTriangle(gfx);
+  
+  sgDel(&gfx);
+  return 0;
+}
+
-- 
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