Make LUTs independent of YUV in cc shaders

cc/output/shader.h

Index: cc/output/shader.h
diff --git a/cc/output/shader.h b/cc/output/shader.h
index c1e4d242d12d485bf7b6e5c1b03d78a246a4e041..f079932b84bba0642cdf4dbc206217480340dabf 100644
--- a/cc/output/shader.h
+++ b/cc/output/shader.h
@@ -130,14 +130,6 @@ enum YUVAlphaTextureMode {
   YUV_HAS_ALPHA_TEXTURE,
 };
 
-enum ColorConversionMode {

[ccameron, 2017/02/02 23:38:07]

Please leave this as an enum instead of a boolean (I've been being emphatic
about using enums instead of booleans here because otherwise the shader
descriptions are "false, true, false, false").

-  // No color conversion is performed.
-  COLOR_CONVERSION_MODE_NONE,
-  // Conversion is done directly from YUV to output RGB space, via a 3D texture
-  // represented as a 2D texture.
-  COLOR_CONVERSION_MODE_LUT_FROM_YUV,
-};
-
 // TODO(ccameron): Merge this with BlendMode.
 enum FragColorMode {
   FRAG_COLOR_MODE_DEFAULT,
@@ -283,8 +275,6 @@ class FragmentShader {
   YUVAlphaTextureMode yuv_alpha_texture_mode_ = YUV_ALPHA_TEXTURE_MODE_NA;
   UVTextureMode uv_texture_mode_ = UV_TEXTURE_MODE_UV;
 
-  ColorConversionMode color_conversion_mode_ = COLOR_CONVERSION_MODE_NONE;
-
   // YUV uniform locations.
   int y_texture_location_ = -1;
   int u_texture_location_ = -1;
@@ -294,13 +284,12 @@ class FragmentShader {
   int ya_clamp_rect_location_ = -1;
   int uv_clamp_rect_location_ = -1;
 
-  // Analytic YUV to RGB convertion.
-  int yuv_matrix_location_ = -1;
-  int yuv_adj_location_ = -1;

[ccameron, 2017/02/02 23:38:07]

Please continue to use these uniforms instead of color_matrix.

The |color_matrix| uniform is for color filters (e.g, a sepia filter), which is
orthogonal to color conversion (and, in principle, could be applied at the same
time as a YUV to RGB conversion).

-
-  // LUT YUV to color-converted RGB.
+  // LUT
+  bool has_lut_ = false;
   int lut_texture_location_ = -1;
   int lut_size_location_ = -1;
+
+  bool has_resource_offset_ = false;
   int resource_multiplier_location_ = -1;
   int resource_offset_location_ = -1;