1 files changed, 32 insertions, 9 deletions

diff --git a/assets/shaders/triangle.metal b/assets/shaders/triangle.metal
index 6522360..ccb7ca7 100644
--- a/assets/shaders/triangle.metal
+++ b/assets/shaders/triangle.metal
@@ -1,17 +1,40 @@
 #include <metal_stdlib>
 using namespace metal;
 
-vertex float4
+struct VertexData {
+    float4 position;
+    float2 texCoords;
+};
+
+struct VertexOut {
+    // The [[position]] attribute of this member indicates that this value
+    // is the clip space position of the vertex when this structure is
+    // returned from the vertex function.
+    float4 position [[position]];
+
+    // Since this member does not have a special attribute, the rasterizer
+    // interpolates its value with the values of the other triangle vertices
+    // and then passes the interpolated value to the fragment shader for each
+    // fragment in the triangle.
+    float2 textureCoordinate;
+};
+
+vertex VertexOut
 vertexShader(uint vertexID [[vertex_id]],
-             constant simd::float3* vertexPositions)
+             constant VertexData* vertexData)
 {
-    float4 vertexOutPositions = float4(vertexPositions[vertexID][0],
-                                       vertexPositions[vertexID][1],
-                                       vertexPositions[vertexID][2],
-                                       1.0f);
-    return vertexOutPositions;
+    VertexOut out;
+    out.position = vertexData[vertexID].position;
+    out.textureCoordinate = vertexData[vertexID].texCoords;
+    return out;
 }
 
-fragment float4 fragmentShader(float4 vertexOutPositions [[stage_in]]) {
-    return float4(182.0f/255.0f, 240.0f/255.0f, 228.0f/255.0f, 1.0f);
+fragment float4 fragmentShader(VertexOut in [[stage_in]],
+                               texture2d<float> colorTexture [[texture(0)]]) {
+    
+    constexpr sampler textureSampler (mag_filter::linear,
+                                      min_filter::linear);
+    // Sample the texture to obtain a color
+    const float4 colorSample = colorTexture.sample(textureSampler, in.textureCoordinate);
+    return colorSample;
 }
\ No newline at end of file