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

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

1 files changed, 2 insertions, 1 deletions

diff --git a/data/shaders/path-fill-vert.glsl b/data/shaders/path-fill-vert.glsl
index 1752978..d66bb14 100644
--- a/data/shaders/path-fill-vert.glsl
+++ b/data/shaders/path-fill-vert.glsl
@@ -16,6 +16,7 @@ out vec2 fragPosition;
 
 uniform mat4 mvp;
 uniform vec4 color;
+uniform mat3 gradientMatrix;
 
 void main(void) {
   // Short-circuit because the fragments will just be discarded
@@ -23,7 +24,7 @@ void main(void) {
   if (color.a <= 0.0) {
     gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
   } else {
-    fragPosition = position;
+    fragPosition = (gradientMatrix * vec3(position, 1.0)).xy;
     gl_Position = mvp * vec4(position, 0.0, 1.0);
   }
 }