post processing, FXAA and MSAA 2x-8x

resources/EngineResources/shaders/multi-sampled_post_process_frag.glsl

@@ -0,0 +1,55 @@
+#version 450
+
+layout(constant_id = 0) const int USE_AA = 0;
+
+const float GAMMA_CONST = 0.4545;
+const float SPAN_MAX = 8.0;
+const float REDUCE_MIN = 1.0/128.0;
+const float REDUCE_MUL = 1.0/32.0;
+
+layout(location = 0) in vec2 inTextCoord;
+layout(location = 0) out vec4 outFragColor;
+
+layout(set = 0, binding = 0) uniform sampler2DMS inputTexture;
+
+layout(set = 1, binding = 0) uniform ScreenSize{
+    vec2 size;
+} screenSize;
+
+vec4 gamma(vec4 color){
+    return color = vec4(pow(color.rgb,vec3(GAMMA_CONST)),color.a);
+}
+
+
+vec4 msaa(int sampleCount, sampler2DMS textureIn,vec2 TextCoord){
+    ivec2 pixelCoords = ivec2(TextCoord * textureSize(textureIn));
+    vec4 colorSum = vec4(0.0);
+
+    for(int i = 0; i < sampleCount; ++i) {
+        vec4 sampleColor = texelFetch(textureIn, pixelCoords, i);
+        sampleColor.rgb = sampleColor.rgb / (sampleColor.rgb + vec3(1.0));
+        colorSum += sampleColor;
+    }
+    return colorSum / float(sampleCount);
+}
+
+void main(){
+    ivec2 pixelCoords = ivec2(inTextCoord * textureSize(inputTexture));
+
+    if(USE_AA == 0){
+        outFragColor = texelFetch(inputTexture,pixelCoords,0);
+    }
+    if(USE_AA == 1){
+        outFragColor = texelFetch(inputTexture,pixelCoords,0);
+    }
+    if(USE_AA == 2){
+        outFragColor = msaa(2,inputTexture,inTextCoord);
+    }
+    if(USE_AA == 3){
+        outFragColor = msaa(4,inputTexture,inTextCoord);
+    }
+    if(USE_AA == 4){
+        outFragColor = msaa(8,inputTexture,inTextCoord);
+    }
+    outFragColor = gamma(outFragColor);
+}