shaders: add skia shaders

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

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

1 files changed, 35 insertions, 0 deletions

diff --git a/shaders/skia/67-8.shader_test b/shaders/skia/67-8.shader_test
new file mode 100644
index 0000000..ed6ea6f
--- /dev/null
+++ b/shaders/skia/67-8.shader_test
@@ -0,0 +1,35 @@
+[require]
+GLSL >= 1.40
+
+[fragment shader]
+#version 140
+
+out vec4 sk_FragColor;
+uniform vec4 uColor_Stage0;
+noperspective in float vinCoverage_Stage0;
+void main() {
+    vec4 outputCoverage_Stage0;
+    {
+        float alpha = 1.0;
+        alpha = vinCoverage_Stage0;
+        outputCoverage_Stage0 = vec4(alpha);
+    }
+    {
+        sk_FragColor = outputCoverage_Stage0;
+    }
+}
+
+[vertex shader]
+#version 140
+
+uniform vec4 sk_RTAdjust;
+in vec2 inPosition;
+in float inCoverage;
+noperspective out float vinCoverage_Stage0;
+void main() {
+    vec2 pos2 = inPosition;
+    vinCoverage_Stage0 = inCoverage;
+    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);
+}
+