support resolution param

src/lights/light/LightShader.js

@@ -19,8 +19,10 @@ export default class LightShader extends PIXI.Shader {
             // should we apply the translation matrix or not.
             uUseViewportQuad: { type: 'bool', value: true },
 
-            // size of the renderer viewport
+            // size of the renderer viewport, CSS
             uViewSize:      { type: '2f', value: new Float32Array(2) },
+            //same, in PIXELS
+            uViewPixels:    { type: '2f', value: new Float32Array(2) },
 
             // light color, alpha channel used for intensity.
             uLightColor:    { type: '4f', value: new Float32Array([1, 1, 1, 1]) },

src/lights/shared/commonUniforms.glsl

@@ -3,7 +3,8 @@ uniform sampler2D uNormalSampler;
 
 uniform mat3 translationMatrix;
 
-uniform vec2 uViewSize;     // size of the viewport
+uniform vec2 uViewPixels;   // size of the viewport, in pixels
+uniform vec2 uViewSize;     // size of the viewport, in CSS
 
 uniform vec4 uLightColor;   // light color, alpha channel used for intensity.
 uniform vec3 uLightFalloff; // light attenuation coefficients (constant, linear, quadratic)

src/lights/shared/computeVertexPosition.glsl

@@ -1,2 +1,2 @@
-vec2 texCoord = gl_FragCoord.xy / uViewSize;
+vec2 texCoord = gl_FragCoord.xy / uViewPixels;
 texCoord.y = (1.0 - texCoord.y) * uFlipY + texCoord.y * (1.0 - uFlipY); // FBOs positions are flipped.

src/renderers/LightRenderer.js

@@ -148,9 +148,19 @@ export default class LightRenderer extends PIXI.ObjectRenderer {
                 shader.uniforms.uNormalSampler = 1;
 
                 let uViewSize = shader.uniforms.uViewSize;
-                uViewSize[0] = renderer.screen.width;
-                uViewSize[1] = renderer.screen.height;
-                shader.uniforms.uViewSize = uViewSize;
+                if (uViewSize) {
+                    uViewSize[0] = renderer.screen.width;
+                    uViewSize[1] = renderer.screen.height;
+                    shader.uniforms.uViewSize = uViewSize;
+                }
+
+                let uViewPixels = shader.uniforms.uViewPixels;
+                if (uViewPixels) {
+                    uViewPixels[0] = renderer.view.width;
+                    uViewPixels[1] = renderer.view.height;
+                    shader.uniforms.uViewPixels = uViewPixels;
+                }
+
                 shader.uniforms.uFlipY = renderer._activeRenderTarget.root ? 1.0 : 0.0;
             }