shaders: add skia shaders

Add shaders extracted from skia's unit tests[1]

[1] https://skia.org/dev/testing/testing

1 files changed, 38 insertions, 0 deletions

diff --git a/shaders/skia/430-2.shader_test b/shaders/skia/430-2.shader_test
new file mode 100644
index 0000000..f4639fb
--- /dev/null
+++ b/shaders/skia/430-2.shader_test
@@ -0,0 +1,38 @@
+[require]
+GLSL >= 1.40
+
+[fragment shader]
+#version 140
+
+uniform vec4 uColor_Stage0;
+uniform vec4 ucircleData_Stage1;
+uniform sampler2D uTextureSampler_0_Stage1;
+noperspective in vec3 vDashParams_Stage0;
+noperspective in vec4 vRectParams_Stage0;
+void main() {
+    {
+        float xShifted = vDashParams_Stage0.x - floor(vDashParams_Stage0.x / vDashParams_Stage0.z) * vDashParams_Stage0.z;
+        vec2 fragPosShifted = vec2(xShifted, vDashParams_Stage0.y);
+        float alpha = 1.0;
+        alpha *= fragPosShifted.x - vRectParams_Stage0.x > -0.5 ? 1.0 : 0.0;
+        alpha *= vRectParams_Stage0.z - fragPosShifted.x >= -0.5 ? 1.0 : 0.0;
+    }
+}
+
+[vertex shader]
+#version 140
+
+uniform vec4 sk_RTAdjust;
+in vec2 inPosition;
+in vec3 inDashParams;
+in vec4 inRect;
+noperspective out vec3 vDashParams_Stage0;
+noperspective out vec4 vRectParams_Stage0;
+void main() {
+    vDashParams_Stage0 = inDashParams;
+    vRectParams_Stage0 = inRect;
+    vec2 pos2 = inPosition;
+    gl_Position = vec4(pos2.x, pos2.y, 0.0, 1.0);
+    gl_Position = vec4(gl_Position.xy * sk_RTAdjust.xz + gl_Position.ww * sk_RTAdjust.yw, 0.0, gl_Position.w);
+}
+