shaders: add skia shaders

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

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

1 files changed, 93 insertions, 0 deletions

diff --git a/shaders/skia/352-4.shader_test b/shaders/skia/352-4.shader_test
new file mode 100644
index 0000000..0247bad
--- /dev/null
+++ b/shaders/skia/352-4.shader_test
@@ -0,0 +1,93 @@
+[require]
+GLSL >= 1.40
+
+[fragment shader]
+#version 140
+
+#extension GL_ARB_fragment_coord_conventions : require
+layout(origin_upper_left) in vec4 gl_FragCoord;
+out vec4 sk_FragColor;
+uniform vec3 uedges_Stage2_c1_c0[7];
+uniform sampler2D uTextureSampler_0_Stage1;
+noperspective in vec2 vTransformedCoords_0_Stage0;
+vec4 ClampFragmentProcessor_Stage2_c0_c0(vec4 _input) {
+    vec4 _output;
+    {
+        float alpha = clamp(_input.w, 0.0, 1.0);
+        _output = vec4(clamp(_input.xyz, 0.0, alpha), alpha);
+    }
+    return _output;
+}
+vec4 ConvexPoly_Stage2_c1_c0(vec4 _input) {
+    vec4 _output;
+    float alpha = 1.0;
+    float edge;
+    edge = dot(uedges_Stage2_c1_c0[0], vec3(gl_FragCoord.x, gl_FragCoord.y, 1.0));
+    edge = clamp(edge, 0.0, 1.0);
+    alpha *= edge;
+    edge = dot(uedges_Stage2_c1_c0[1], vec3(gl_FragCoord.x, gl_FragCoord.y, 1.0));
+    edge = clamp(edge, 0.0, 1.0);
+    alpha *= edge;
+    edge = dot(uedges_Stage2_c1_c0[2], vec3(gl_FragCoord.x, gl_FragCoord.y, 1.0));
+    edge = clamp(edge, 0.0, 1.0);
+    alpha *= edge;
+    edge = dot(uedges_Stage2_c1_c0[3], vec3(gl_FragCoord.x, gl_FragCoord.y, 1.0));
+    edge = clamp(edge, 0.0, 1.0);
+    alpha *= edge;
+    edge = dot(uedges_Stage2_c1_c0[4], vec3(gl_FragCoord.x, gl_FragCoord.y, 1.0));
+    edge = clamp(edge, 0.0, 1.0);
+    alpha *= edge;
+    edge = dot(uedges_Stage2_c1_c0[5], vec3(gl_FragCoord.x, gl_FragCoord.y, 1.0));
+    edge = clamp(edge, 0.0, 1.0);
+    alpha *= edge;
+    edge = dot(uedges_Stage2_c1_c0[6], vec3(gl_FragCoord.x, gl_FragCoord.y, 1.0));
+    edge = clamp(edge, 0.0, 1.0);
+    alpha *= edge;
+    alpha = 1.0 - alpha;
+    _output = _input * alpha;
+    return _output;
+}
+float _blend_overlay_component(float sc, float sa, float dc, float da) {
+    if (2.0 * dc <= da) {
+        return (2.0 * sc) * dc;
+    }
+    return sa * da - (2.0 * (da - dc)) * (sa - sc);
+}
+vec4 blend_overlay(vec4 src, vec4 dst) {
+    vec4 result = vec4(_blend_overlay_component(src.x, src.w, dst.x, dst.w), _blend_overlay_component(src.y, src.w, dst.y, dst.w), _blend_overlay_component(src.z, src.w, dst.z, dst.w), src.w + (1.0 - src.w) * dst.w);
+    result.xyz += dst.xyz * (1.0 - src.w) + src.xyz * (1.0 - dst.w);
+    return result;
+}
+vec4 blend_hard_light(vec4 src, vec4 dst) {
+    return blend_overlay(dst, src);
+}
+void main() {
+    vec4 output_Stage1;
+    {
+        output_Stage1 = texture(uTextureSampler_0_Stage1, vTransformedCoords_0_Stage0);
+    }
+    vec4 output_Stage2;
+    {
+        vec4 inputColor = vec4(output_Stage1.xyz, 1.0);
+        output_Stage2 = blend_hard_light(ClampFragmentProcessor_Stage2_c0_c0(inputColor), ConvexPoly_Stage2_c1_c0(inputColor));
+        output_Stage2 *= output_Stage1.w;
+    }
+    {
+        sk_FragColor = output_Stage2;
+    }
+}
+
+[vertex shader]
+#version 140
+
+uniform vec4 sk_RTAdjust;
+uniform mat3 uCoordTransformMatrix_0_Stage0;
+in vec2 position;
+in vec2 localCoord;
+noperspective out vec2 vTransformedCoords_0_Stage0;
+void main() {
+    vTransformedCoords_0_Stage0 = (uCoordTransformMatrix_0_Stage0 * vec3(localCoord, 1.0)).xy;
+    gl_Position = vec4(position.x, position.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);
+}
+