fixed compilation of hdr downscale shader on wasm

- #876

Author: mrDIMAS

fyrox-impl/src/renderer/shaders/hdr_downscale.shader

@@ -63,28 +63,30 @@
                     void main() {
                         float x = properties.invSize.x;
                         float y = properties.invSize.y;
+                        float twoX = 2.0 * x;
+                        float twoY = 2.0 * y;
 
-                        float a = texture(lumSampler, vec2(texCoord.x - 2*x, texCoord.y + 2*y)).r;
-                        float b = texture(lumSampler, vec2(texCoord.x,       texCoord.y + 2*y)).r;
-                        float c = texture(lumSampler, vec2(texCoord.x + 2*x, texCoord.y + 2*y)).r;
+                        float a = texture(lumSampler, vec2(texCoord.x - twoX, texCoord.y + twoY)).r;
+                        float b = texture(lumSampler, vec2(texCoord.x, texCoord.y + twoY)).r;
+                        float c = texture(lumSampler, vec2(texCoord.x + twoX, texCoord.y + twoY)).r;
 
-                        float d = texture(lumSampler, vec2(texCoord.x - 2*x, texCoord.y)).r;
-                        float e = texture(lumSampler, vec2(texCoord.x,       texCoord.y)).r;
-                        float f = texture(lumSampler, vec2(texCoord.x + 2*x, texCoord.y)).r;
+                        float d = texture(lumSampler, vec2(texCoord.x - twoX, texCoord.y)).r;
+                        float e = texture(lumSampler, vec2(texCoord.x, texCoord.y)).r;
+                        float f = texture(lumSampler, vec2(texCoord.x + twoX, texCoord.y)).r;
 
-                        float g = texture(lumSampler, vec2(texCoord.x - 2*x, texCoord.y - 2*y)).r;
-                        float h = texture(lumSampler, vec2(texCoord.x,       texCoord.y - 2*y)).r;
-                        float i = texture(lumSampler, vec2(texCoord.x + 2*x, texCoord.y - 2*y)).r;
+                        float g = texture(lumSampler, vec2(texCoord.x - twoX, texCoord.y - twoY)).r;
+                        float h = texture(lumSampler, vec2(texCoord.x, texCoord.y - twoY)).r;
+                        float i = texture(lumSampler, vec2(texCoord.x + twoX, texCoord.y - twoY)).r;
 
                         float j = texture(lumSampler, vec2(texCoord.x - x, texCoord.y + y)).r;
                         float k = texture(lumSampler, vec2(texCoord.x + x, texCoord.y + y)).r;
                         float l = texture(lumSampler, vec2(texCoord.x - x, texCoord.y - y)).r;
                         float m = texture(lumSampler, vec2(texCoord.x + x, texCoord.y - y)).r;
 
-                        outLum = e*0.125;
-                        outLum += (a+c+g+i)*0.03125;
-                        outLum += (b+d+f+h)*0.0625;
-                        outLum += (j+k+l+m)*0.125;
+                        outLum = e * 0.125;
+                        outLum += (a + c + g + i) * 0.03125;
+                        outLum += (b + d + f + h) * 0.0625;
+                        outLum += (j + k + l + m) * 0.125;
                     }
                 "#,
         )