From 76dc3f0af36775d2fdaab61134dd0f875ee48292 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Sat, 30 Dec 2023 19:32:19 -0500
Subject: WIP graphics engine rewrite.

---
 data/shaders/path-fill-frag.glsl   | 14 ++++++++++++++
 data/shaders/path-fill-vert.glsl   | 13 +++++++++++++
 data/shaders/path-stroke-frag.glsl | 18 ++++++++++++++++--
 data/shaders/path-stroke-vert.glsl | 14 ++++++++++++++
 4 files changed, 57 insertions(+), 2 deletions(-)

(limited to 'data/shaders')

diff --git a/data/shaders/path-fill-frag.glsl b/data/shaders/path-fill-frag.glsl
index e839318..3e10bf0 100644
--- a/data/shaders/path-fill-frag.glsl
+++ b/data/shaders/path-fill-frag.glsl
@@ -12,11 +12,25 @@ varying vec2 fragPosition;
 in vec2 fragPosition;
 #endif
 
+#ifdef GLSL120
 uniform int mode;
 uniform vec4 color;
 uniform vec4 endColor;
+uniform mat3 gradientMatrix;
 uniform vec2 gradientRange;
 uniform float radialGradientRatio;
+#else
+layout (std140) uniform Fill
+{
+  mat4 mvp;
+  vec4 color;
+  int mode;
+  vec4 endColor;
+  mat3 gradientMatrix;
+  vec2 gradientRange;
+  float radialGradientRatio;
+};
+#endif
 
 vec4 gradientMix(float x) {
   float start = gradientRange.x;
diff --git a/data/shaders/path-fill-vert.glsl b/data/shaders/path-fill-vert.glsl
index d66bb14..f8bcace 100644
--- a/data/shaders/path-fill-vert.glsl
+++ b/data/shaders/path-fill-vert.glsl
@@ -14,9 +14,22 @@ varying vec2 fragPosition;
 out vec2 fragPosition;
 #endif
 
+#ifdef GLSL120
 uniform mat4 mvp;
 uniform vec4 color;
 uniform mat3 gradientMatrix;
+#else
+layout (std140) uniform Fill
+{
+  mat4 mvp;
+  vec4 color;
+  int mode;
+  vec4 endColor;
+  mat3 gradientMatrix;
+  vec2 gradientRange;
+  float radialGradientRatio;
+};
+#endif
 
 void main(void) {
   // Short-circuit because the fragments will just be discarded
diff --git a/data/shaders/path-stroke-frag.glsl b/data/shaders/path-stroke-frag.glsl
index 9682c8f..324e3cf 100644
--- a/data/shaders/path-stroke-frag.glsl
+++ b/data/shaders/path-stroke-frag.glsl
@@ -14,6 +14,7 @@ in vec2 fragTex;
 in float fragStrokeLength;
 #endif
 
+#ifdef GLSL120
 uniform vec4 color;
 uniform float feather;
 uniform int strokeClosed;
@@ -21,6 +22,19 @@ uniform float strokeWidth;
 uniform int strokeCap;
 uniform int strokeMiterStyle;
 uniform float strokeMiterLimit;
+#else
+layout (std140) uniform Stroke
+{
+  mat4 mvp;
+  vec4 color;
+  float feather;
+  float strokeWidth;
+  float strokeMiterLimit;
+  int strokeClosed;
+  int strokeCap;
+  int strokeMiterStyle;
+};
+#endif
 
 float infinity = 1.0 / 0.0;
 
@@ -47,7 +61,7 @@ void main(void) {
 
     if (strokeCap == 0) { // none
       d = infinity;
-    } else if (strokeCap == 1) { // butt
+    } else if (strokeCap == 1) { // butt (huh huh)
       d = max(dx + hw - 2 * feather, dy);
     } else if (strokeCap == 2) { // square
       d = max(dx, dy);
@@ -58,7 +72,7 @@ void main(void) {
     } else if (strokeCap == 5) { // triangle in
       d = max(dy, hw - feather + dx - dy);
     }
-    // Stroke inner/join
+  // Stroke inner/join
   } else {
     d = abs(v);
   }
diff --git a/data/shaders/path-stroke-vert.glsl b/data/shaders/path-stroke-vert.glsl
index 5915010..f1c7e3a 100644
--- a/data/shaders/path-stroke-vert.glsl
+++ b/data/shaders/path-stroke-vert.glsl
@@ -22,10 +22,24 @@ out vec2 fragTex;
 out float fragStrokeLength;
 #endif
 
+#ifdef GLSL120
 uniform mat4 mvp;
 uniform vec4 color;
 uniform int mode;
 uniform int strokeClosed;
+#else
+layout (std140) uniform Stroke
+{
+  mat4 mvp;
+  vec4 color;
+  float feather;
+  float strokeWidth;
+  float strokeMiterLimit;
+  int strokeClosed;
+  int strokeCap;
+  int strokeMiterStyle;
+};
+#endif
 
 void main(void) {
   // Short-circuit because the fragments will just be discarded anyway.
-- 
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