shaders: add skia shaders

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

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

1 files changed, 63 insertions, 0 deletions

diff --git a/shaders/skia/49-12.shader_test b/shaders/skia/49-12.shader_test
new file mode 100644
index 0000000..f161606
--- /dev/null
+++ b/shaders/skia/49-12.shader_test
@@ -0,0 +1,63 @@
+[require]
+GLSL >= 1.40
+
+[fragment shader]
+#version 140
+
+out vec4 sk_FragColor;
+uniform vec4 uborder_Stage1;
+uniform vec4 usubset_Stage1;
+uniform vec4 uclamp_Stage1;
+uniform vec4 unorm_Stage1;
+uniform sampler2D uTextureSampler_0_Stage1;
+flat in vec4 vcolor_Stage0;
+noperspective in vec2 vTransformedCoords_0_Stage0;
+void main() {
+    vec4 outputColor_Stage0;
+    {
+        outputColor_Stage0 = vcolor_Stage0;
+    }
+    vec4 output_Stage1;
+    {
+        vec2 inCoord = vTransformedCoords_0_Stage0;
+        inCoord *= unorm_Stage1.xy;
+        vec2 subsetCoord;
+        {
+            float w = usubset_Stage1.z - usubset_Stage1.x;
+            float w2 = 2.0 * w;
+            float m = mod(inCoord.x - usubset_Stage1.x, w2);
+            subsetCoord.x = mix(m, w2 - m, step(w, m)) + usubset_Stage1.x;
+        }
+        subsetCoord.y = inCoord.y;
+        vec2 clampedCoord;
+        clampedCoord.x = clamp(subsetCoord.x, uclamp_Stage1.x, uclamp_Stage1.z);
+        clampedCoord.y = subsetCoord.y;
+        vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord * unorm_Stage1.zw);
+        if (inCoord.y < usubset_Stage1.y || inCoord.y > usubset_Stage1.w) {
+            textureColor = uborder_Stage1;
+        }
+        output_Stage1 = outputColor_Stage0 * textureColor;
+    }
+    {
+        sk_FragColor = output_Stage1;
+    }
+}
+
+[vertex shader]
+#version 140
+
+uniform vec4 sk_RTAdjust;
+uniform mat3 uCoordTransformMatrix_0_Stage0;
+in vec2 inPosition;
+in vec2 inLocalCoords;
+in vec4 color;
+flat out vec4 vcolor_Stage0;
+noperspective out vec2 vTransformedCoords_0_Stage0;
+void main() {
+    vcolor_Stage0 = color;
+    vec2 pos2 = inPosition;
+    vTransformedCoords_0_Stage0 = (uCoordTransformMatrix_0_Stage0 * vec3(inLocalCoords, 1.0)).xy;
+    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);
+}
+