Re-re-land sksl fragment processor support
This reverts commit 5ce397205528f82084fc650c2ce27d246c01da33.
Bug: skia:
Change-Id: I88260c90004610a1cf8ad1a87c2b4b222525bbb6
Reviewed-on: https://skia-review.googlesource.com/21108
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/sksl_fp.include b/src/sksl/sksl_fp.include
new file mode 100644
index 0000000..566e441
--- /dev/null
+++ b/src/sksl/sksl_fp.include
@@ -0,0 +1,23 @@
+STRINGIFY(
+
+// defines built-in interfaces supported by SkiaSL fragment shaders
+
+layout(builtin=15) in vec4 sk_FragCoord;
+layout(builtin=3) float sk_ClipDistance[1];
+
+// 9999 is a temporary value that causes us to ignore these declarations beyond
+// adding them to the symbol table. This works fine in GLSL (where they do not
+// require any further handling) but will fail in SPIR-V. We'll have a better
+// solution for this soon.
+layout(builtin=9999) vec4 gl_LastFragData[1];
+layout(builtin=9999) vec4 gl_LastFragColor;
+layout(builtin=9999) vec4 gl_LastFragColorARM;
+layout(builtin=9999) int gl_SampleMaskIn[1];
+layout(builtin=9999) out int gl_SampleMask[1];
+layout(builtin=9999) vec4 gl_SecondaryFragColorEXT;
+
+layout(builtin=10003) vec4 sk_InColor;
+layout(builtin=10004) out vec4 sk_OutColor;
+layout(builtin=10005) vec2[] sk_TransformedCoords2D;
+layout(builtin=10006) sampler2D[] sk_TextureSamplers;
+)