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external/SDL/test/testgpurender_effects_grayscale.frag.hlsl

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+Texture2D u_texture : register(t0, space2);
+SamplerState u_sampler : register(s0, space2);
+
+struct PSInput {
+    float4 v_color : COLOR0;
+    float2 v_uv : TEXCOORD0;
+};
+
+struct PSOutput {
+    float4 o_color : SV_Target;
+};
+
+PSOutput main(PSInput input) {
+    PSOutput output;
+    float4 color = u_texture.Sample(u_sampler, input.v_uv) * input.v_color;
+    float gray = color.r * 0.299 + color.g * 0.587 + color.r * 0.114;
+    output.o_color = float4(gray, gray, gray, color.a);
+    return output;
+}