shaders: add skia shaders

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

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

1 files changed, 156 insertions, 0 deletions

diff --git a/shaders/skia/157-3.shader_test b/shaders/skia/157-3.shader_test
new file mode 100644
index 0000000..f1548d7
--- /dev/null
+++ b/shaders/skia/157-3.shader_test
@@ -0,0 +1,156 @@
+[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 vec2 uImageIncrement_Stage1;
+uniform float uSurfaceScale_Stage1;
+uniform vec3 uLightColor_Stage1;
+uniform float uKS_Stage1;
+uniform float uShininess_Stage1;
+uniform vec3 uLightLocation_Stage1;
+uniform float uExponent_Stage1;
+uniform float uCosInnerConeAngle_Stage1;
+uniform float uCosOuterConeAngle_Stage1;
+uniform float uConeScale_Stage1;
+uniform vec3 uS_Stage1;
+uniform sampler2D uTextureSampler_0_Stage1;
+noperspective in vec2 vTransformedCoords_0_Stage0;
+vec4 light_Stage1(vec3 normal, vec3 surfaceToLight, vec3 lightColor) {
+    vec3 halfDir = normalize(surfaceToLight + vec3(0.0, 0.0, 1.0));
+    float colorScale = uKS_Stage1 * pow(dot(normal, halfDir), uShininess_Stage1);
+    vec3 color = lightColor * clamp(colorScale, 0.0, 1.0);
+    return vec4(color, max(max(color.x, color.y), color.z));
+}
+float sobel_Stage1(float a, float b, float c, float d, float e, float f, float scale) {
+    return (((((-a + b) - 2.0 * c) + 2.0 * d) - e) + f) * scale;
+}
+vec3 pointToNormal_Stage1(float x, float y, float scale) {
+    return normalize(vec3(-x * scale, -y * scale, 1.0));
+}
+vec3 normal_Stage1(float m[9], float surfaceScale) {
+    return pointToNormal_Stage1(sobel_Stage1(m[0], m[1], m[3], m[4], m[6], m[7], 0.5), sobel_Stage1(m[0], m[6], m[1], m[7], 0.0, 0.0, 0.33333298563957214), surfaceScale);
+}
+vec3 lightColor_Stage1(vec3 surfaceToLight) {
+    float cosAngle = -dot(surfaceToLight, uS_Stage1);
+    if (cosAngle < uCosOuterConeAngle_Stage1) {
+        return vec3(0.0);
+    }
+    float scale = pow(cosAngle, uExponent_Stage1);
+    if (cosAngle < uCosInnerConeAngle_Stage1) {
+        return ((uLightColor_Stage1 * scale) * (cosAngle - uCosOuterConeAngle_Stage1)) * uConeScale_Stage1;
+    }
+    return uLightColor_Stage1;
+}
+void main() {
+    vec4 output_Stage1;
+    {
+        vec2 coord = vTransformedCoords_0_Stage0;
+        float m[9];
+        vec4 temp0;
+        {
+            vec2 origCoord = coord + vec2(-1.0, 1.0) * uImageIncrement_Stage1;
+            vec2 clampedCoord;
+            clampedCoord = origCoord;
+            vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord);
+            temp0 = textureColor;
+        }
+        m[0] = temp0.w;
+        vec4 temp1;
+        {
+            vec2 origCoord = coord + vec2(0.0, 1.0) * uImageIncrement_Stage1;
+            vec2 clampedCoord;
+            clampedCoord = origCoord;
+            vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord);
+            temp1 = textureColor;
+        }
+        m[1] = temp1.w;
+        vec4 temp2;
+        {
+            vec2 origCoord = coord + uImageIncrement_Stage1;
+            vec2 clampedCoord;
+            clampedCoord = origCoord;
+            vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord);
+            temp2 = textureColor;
+        }
+        m[2] = temp2.w;
+        vec4 temp3;
+        {
+            vec2 origCoord = coord + vec2(-1.0, 0.0) * uImageIncrement_Stage1;
+            vec2 clampedCoord;
+            clampedCoord = origCoord;
+            vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord);
+            temp3 = textureColor;
+        }
+        m[3] = temp3.w;
+        vec4 temp4;
+        {
+            vec2 origCoord = coord;
+            vec2 clampedCoord;
+            clampedCoord = origCoord;
+            vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord);
+            temp4 = textureColor;
+        }
+        m[4] = temp4.w;
+        vec4 temp5;
+        {
+            vec2 origCoord = coord + vec2(1.0, 0.0) * uImageIncrement_Stage1;
+            vec2 clampedCoord;
+            clampedCoord = origCoord;
+            vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord);
+            temp5 = textureColor;
+        }
+        m[5] = temp5.w;
+        vec4 temp6;
+        {
+            vec2 origCoord = coord + vec2(-1.0, -1.0) * uImageIncrement_Stage1;
+            vec2 clampedCoord;
+            clampedCoord = origCoord;
+            vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord);
+            temp6 = textureColor;
+        }
+        m[6] = temp6.w;
+        vec4 temp7;
+        {
+            vec2 origCoord = coord + vec2(0.0, -1.0) * uImageIncrement_Stage1;
+            vec2 clampedCoord;
+            clampedCoord = origCoord;
+            vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord);
+            temp7 = textureColor;
+        }
+        m[7] = temp7.w;
+        vec4 temp8;
+        {
+            vec2 origCoord = coord + vec2(1.0, -1.0) * uImageIncrement_Stage1;
+            vec2 clampedCoord;
+            clampedCoord = origCoord;
+            vec4 textureColor = texture(uTextureSampler_0_Stage1, clampedCoord);
+            temp8 = textureColor;
+        }
+        m[8] = temp8.w;
+        vec3 surfaceToLight = normalize(uLightLocation_Stage1 - vec3(gl_FragCoord.xy, uSurfaceScale_Stage1 * m[4]));
+        output_Stage1 = light_Stage1(normal_Stage1(m, uSurfaceScale_Stage1), surfaceToLight, lightColor_Stage1(surfaceToLight));
+    }
+    {
+        sk_FragColor = output_Stage1;
+    }
+}
+
+[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);
+}
+