HDR, Bloom and SSR

resources/EngineResources/shaders/multi-sampled_post_process_frag.glsl

@@ -9,6 +9,7 @@ const float REDUCE_MUL = 1.0/32.0;
 
 layout(location = 0) in vec2 inTextCoord;
 layout(location = 0) out vec4 outFragColor;
+layout(location = 1) out vec4 outBloomColour;
 
 layout(set = 0, binding = 0) uniform sampler2DMS inputTexture;
 
@@ -19,7 +20,12 @@ layout(set = 1, binding = 0) uniform ScreenSize{
 vec4 gamma(vec4 color){
     return color = vec4(pow(color.rgb,vec3(GAMMA_CONST)),color.a);
 }
-
+vec3 HDR(float Gamma, float Exposure, sampler2D Texture, vec2 TexCoords){
+    vec3 hdrColor = texture(Texture, TexCoords).rgb;
+    vec3 mapped = vec3(1.0) - exp(-hdrColor * Exposure);
+    mapped = pow(mapped, vec3(1.0 / Gamma));
+    return mapped;
+}
 vec4 msaa(int sampleCount, sampler2DMS textureIn,vec2 TextCoord){
     ivec2 pixelCoords = ivec2(TextCoord * textureSize(textureIn));
     vec4 colorSum = vec4(0.0);
@@ -34,6 +40,8 @@ vec4 msaa(int sampleCount, sampler2DMS textureIn,vec2 TextCoord){
 void main(){
     ivec2 pixelCoords = ivec2(inTextCoord * textureSize(inputTexture));
 
+    outFragColor = texelFetch(inputTexture, pixelCoords, 0);
+
     if(USE_AA == 0){
         outFragColor = texelFetch(inputTexture,pixelCoords,0);
     }
@@ -49,5 +57,16 @@ void main(){
     if(USE_AA == 4){
         outFragColor = msaa(8,inputTexture,inTextCoord);
     }
-    outFragColor = gamma(outFragColor);
+
+    vec3 color = outFragColor.rgb;
+
+    float brightness = dot(color, vec3(0.2126, 0.7152, 0.0722));
+
+    float threshold = 1.0;
+    float softKnee = 0.5;
+
+    float contribution = max(brightness - threshold, 0.0);
+    contribution = contribution / max(contribution + softKnee, 0.0001);
+
+    outBloomColour = vec4(color * contribution, 1.0);
 }