archivemuh

archive/dusksdl2/display/mesh/quad.c

@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "quad.h"
+#include "assert/assert.h"
+
+void quadBuffer(
+  meshvertex_t *vertices,
+  const float_t minX,
+  const float_t minY,
+  const float_t maxX,
+  const float_t maxY,
+  const uint8_t r,
+  const uint8_t g,
+  const uint8_t b,
+  const uint8_t a,
+  const float_t u0,
+  const float_t v0,
+  const float_t u1,
+  const float_t v1
+) {
+  const float_t z = 0.0f; // Z coordinate for 2D rendering
+  assertNotNull(vertices, "Vertices cannot be NULL");
+
+  // First triangle
+  vertices[0] = (meshvertex_t) {
+    { r, g, b, a }, // Color
+    { u0, v0 },    // UV
+    { minX, minY, z } // Position
+  };
+  vertices[1] = (meshvertex_t) {
+    { r, g, b, a }, // Color
+    { u1, v0 },    // UV
+    { maxX, minY, z } // Position
+  };
+  vertices[2] = (meshvertex_t) {
+    { r, g, b, a }, // Color
+    { u1, v1 },    // UV
+    { maxX, maxY, z } // Position
+  }; 
+
+  // Second triangle
+  vertices[3] = (meshvertex_t) {
+    { r, g, b, a }, // Color
+    { u0, v0 },    // UV
+    { minX, minY, z } // Position
+  };
+  vertices[4] = (meshvertex_t) {
+    { r, g, b, a }, // Color
+    { u1, v1 },    // UV
+    { maxX, maxY, z } // Position
+  };
+  vertices[5] = (meshvertex_t) {
+    { r, g, b, a }, // Color
+    { u0, v1 },    // UV
+    { minX, maxY, z } // Position
+  };
+}