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external/SDL/test/testgpurender_msdf.frag.hlsl

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+cbuffer Context : register(b0, space3) {
+    float distance_field_range;
+    float2 texture_size;
+};
+
+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;
+};
+
+float median(float r, float g, float b) {
+    return max(min(r, g), min(max(r, g), b));
+}
+
+float screenPxRange(float2 texCoord) {
+    float2 unitRange = float2(distance_field_range, distance_field_range)/texture_size;
+    float2 screenTexSize = float2(1.0, 1.0)/fwidth(texCoord);
+    return max(0.5*dot(unitRange, screenTexSize), 1.0);
+}
+
+PSOutput main(PSInput input) {
+    PSOutput output;
+    float3 msd = u_texture.Sample(u_sampler, input.v_uv).rgb;
+    float sd = median(msd.r, msd.g, msd.b);
+    float screenPxDistance = screenPxRange(input.v_uv)*(sd - 0.5);
+    float opacity = clamp(screenPxDistance + 0.5, 0.0, 1.0);
+    output.o_color.rgb = input.v_color.rgb;
+    output.o_color.a = (input.v_color.a * opacity);
+    return output;
+}