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authorDavid Thompson <dthompson2@worcester.edu>2021-09-07 20:12:35 -0400
committerDavid Thompson <dthompson2@worcester.edu>2021-09-08 07:24:43 -0400
commitb63ce7f900ee6a4631eacd1db07b2c9c9be12780 (patch)
tree853f02e690a84de7de46382cf68f0788a84d2691 /data/shaders/path-fill-frag.glsl
parentde3be995ed26f9ea78f7462095919ba08df2cd25 (diff)
graphics: path: Add support for linear/radial gradient fills.
Diffstat (limited to 'data/shaders/path-fill-frag.glsl')
-rw-r--r--data/shaders/path-fill-frag.glsl28
1 files changed, 27 insertions, 1 deletions
diff --git a/data/shaders/path-fill-frag.glsl b/data/shaders/path-fill-frag.glsl
index 3af191f..e336e76 100644
--- a/data/shaders/path-fill-frag.glsl
+++ b/data/shaders/path-fill-frag.glsl
@@ -6,12 +6,38 @@ out vec4 fragColor;
#define fragColor gl_FragColor
#endif
+#ifdef GLSL120
+attribute vec2 fragPosition;
+#else
+in vec2 fragPosition;
+#endif
+
+uniform int mode;
uniform vec4 color;
+uniform vec4 endColor;
+uniform mat3 gradientMatrix;
+uniform vec2 gradientRange;
+uniform float radialGradientRatio;
+
+vec4 gradientMix(float x) {
+ float start = gradientRange.x;
+ float end = gradientRange.y;
+ float t = clamp((x - start) / (end - start), 0.0, 1.0);
+ return mix(color, endColor, t);
+}
void main(void) {
if (color.a <= 0.0) {
discard;
}
- fragColor = color;
+ if(mode == 0) { // solid color
+ fragColor = color;
+ } else if(mode == 1) { // linear gradient
+ float x = (gradientMatrix * vec3(fragPosition, 1.0)).x;
+ fragColor = gradientMix(x);
+ } else if(mode == 2) { // radial gradient
+ vec2 p = (gradientMatrix * vec3(fragPosition, 1.0)).xy;
+ fragColor = gradientMix(length(p * vec2(1.0, radialGradientRatio)));
+ }
}