render-zig

commit 848206676e741c9356e82718989aef6f01f93f42
parent fb35bee28d5c4798cede5817c569558d364ab959
Author: Christian Ermann <christianermann@gmail.com>
Date:   Wed,  8 May 2024 20:19:57 -0400

Add normals to shaders

Diffstat:
M
src/main.zig
 | 
23
+++++++++++++++++++----

1 file changed, 19 insertions(+), 4 deletions(-)
diff --git a/src/main.zig b/src/main.zig
@@ -568,6 +568,12 @@ const UnlitRenderPipeline = struct {
         const vs =
             \\ struct VertexInput {
             \\     @location(0) position: vec4<f32>,
+            \\     @location(1) normal: vec3<f32>,
+            \\ };
+            \\
+            \\ struct VertexOutput {
+            \\     @builtin(position) clip_position: vec4<f32>,
+            \\     @location(0) normal: vec3<f32>,
             \\ };
             \\
             \\ @group(0) @binding(0)
@@ -576,9 +582,12 @@ const UnlitRenderPipeline = struct {
             \\     model_matrix: mat4x4<f32>,
             \\ };
             \\
-            \\ @vertex fn main(in: VertexInput, @builtin(instance_index) idx: u32) -> @builtin(position) vec4<f32> {
+            \\ @vertex fn main(
+            \\     in: VertexInput,
+            \\     @builtin(instance_index) idx: u32,
+            \\ ) -> VertexOutput {
             \\     let model_matrix = instances[idx].model_matrix;
-            \\     return model_matrix * in.position;
+            \\     return VertexOutput(model_matrix * in.position, in.normal);
             \\ }
         ;
         const vs_module = app.device.createShaderModuleWGSL("default vertex shader", vs);
@@ -592,8 +601,14 @@ const UnlitRenderPipeline = struct {
         });
 
         const fs =
-            \\ @fragment fn main() -> @location(0) vec4<f32> {
-            \\     return vec4<f32>(1.0, 0.0, 0.0, 1.0);
+            \\ struct VertexOutput {
+            \\     @builtin(position) position: vec4<f32>,
+            \\     @location(0) normal: vec3<f32>,
+            \\ };
+            \\
+            \\ @fragment fn main(in: VertexOutput) -> @location(0) vec4<f32> {
+            \\     let color = (in.normal + 1.0) * 0.5;
+            \\     return vec4<f32>(color, 1.0);
             \\ }
         ;
         const fs_module = app.device.createShaderModuleWGSL("default fragment shader", fs);