graphics: path: Move gradient matrix multiplication to vertex shader.

*Much* cheaper to do this per-vertex than per-fragment.

1 files changed, 3 insertions, 5 deletions

diff --git a/data/shaders/path-fill-frag.glsl b/data/shaders/path-fill-frag.glsl
index e336e76..ba9c5a6 100644
--- a/data/shaders/path-fill-frag.glsl
+++ b/data/shaders/path-fill-frag.glsl
@@ -15,7 +15,6 @@ in vec2 fragPosition;
 uniform int mode;
 uniform vec4 color;
 uniform vec4 endColor;
-uniform mat3 gradientMatrix;
 uniform vec2 gradientRange;
 uniform float radialGradientRatio;
 
@@ -34,10 +33,9 @@ void main(void) {
   if(mode == 0) { // solid color
     fragColor = color;
   } else if(mode == 1) { // linear gradient
-    float x = (gradientMatrix * vec3(fragPosition, 1.0)).x;
-    fragColor = gradientMix(x);
+    fragColor = gradientMix(fragPosition.x);
   } else if(mode == 2) { // radial gradient
-    vec2 p = (gradientMatrix * vec3(fragPosition, 1.0)).xy;
-    fragColor = gradientMix(length(p * vec2(1.0, radialGradientRatio)));
+    vec2 p = fragPosition * vec2(1.0, radialGradientRatio);
+    fragColor = gradientMix(length(p));
   }
 }