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authorMatthew Kosarek <matthew@matthewkosarek.xyz>2023-08-15 07:29:58 -0400
committerMatthew Kosarek <matthew@matthewkosarek.xyz>2023-08-15 07:29:58 -0400
commit61cd8d99e6a3475eaf2bd28bc24892cf1aae0398 (patch)
tree5d7aa844cb1ef1fccb124b0e5832635ae22fed9b /themes/src/_shaders
parent056d4560f72a9ec281f8df31aa2a7d8241d6adf1 (diff)
WIP on the summer theme
Diffstat (limited to 'themes/src/_shaders')
-rw-r--r--themes/src/_shaders/sun.frag48
-rw-r--r--themes/src/_shaders/sun.vert13
2 files changed, 61 insertions, 0 deletions
diff --git a/themes/src/_shaders/sun.frag b/themes/src/_shaders/sun.frag
new file mode 100644
index 0000000..dabd7ea
--- /dev/null
+++ b/themes/src/_shaders/sun.frag
@@ -0,0 +1,48 @@
+varying lowp vec4 VertexColor;
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform vec2 u_resolution;
+
+vec2 skew (vec2 st) {
+ vec2 r = vec2(0.0);
+ r.x = 1.1547*st.x;
+ r.y = st.y+0.5*r.x;
+ return r;
+}
+
+vec3 simplexGrid (vec2 st) {
+ vec3 xyz = vec3(0.0);
+
+ vec2 p = fract(skew(st));
+ if (p.x > p.y) {
+ xyz.xy = 1.0-vec2(p.x,p.y-p.x);
+ xyz.z = p.y;
+ } else {
+ xyz.yz = 1.0-vec2(p.x-p.y,p.y);
+ xyz.x = p.x;
+ }
+
+ return fract(xyz);
+}
+
+void main() {
+ vec2 st = gl_FragCoord.xy/u_resolution.xy;
+ vec3 color = VertexColor.xyz
+
+ // Scale the space to see the grid
+ st *= 10.;
+
+ // Show the 2D grid
+ color.rg = fract(st);
+
+ // Skew the 2D grid
+ // color.rg = fract(skew(st));
+
+ // Subdivide the grid into to equilateral triangles
+ // color = simplexGrid(st);
+
+ gl_FragColor = vec4(color,1.0);
+}
diff --git a/themes/src/_shaders/sun.vert b/themes/src/_shaders/sun.vert
index e69de29..76150f0 100644
--- a/themes/src/_shaders/sun.vert
+++ b/themes/src/_shaders/sun.vert
@@ -0,0 +1,13 @@
+
+attribute vec2 position;
+attribute vec4 color;
+attribute mat4 vMatrix;
+uniform mat4 projection;
+uniform mat4 model;
+varying lowp vec4 VertexColor;
+
+void main() {
+ vec4 fragmentPosition = projection * model * vMatrix * vec4(position.x, position.y, 0, 1);
+ gl_Position = fragmentPosition;
+ VertexColor = color;
+}