Add GrPaint::*StageEnabled() and GrDrawState::stageEnabled() functions.

These wrap the question of "is this stage of the shader enabled?" so that
we can change the semantics - previously iff there was a texture, now
if there is a texture OR a GrCustomStage, soon (post-cl 6306097) iff there
is a GrCustomStage, which at that point will hold whatever texture is
necessary.

http://codereview.appspot.com/6306104/



git-svn-id: http://skia.googlecode.com/svn/trunk@4325 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 12 insertions, 0 deletions

diff --git a/include/gpu/GrPaint.h b/include/gpu/GrPaint.h
index 729f6f060e..3c8c47afe4 100644
--- a/include/gpu/GrPaint.h
+++ b/include/gpu/GrPaint.h
@@ -64,6 +64,12 @@ public:
         return fTextureSamplers[i];
     }
 
+    bool isTextureStageEnabled(int i) const {
+        GrAssert((unsigned)i < kMaxTextures);
+        return (NULL != fTextures[i]) ||
+               (NULL != fTextureSamplers[i].getCustomStage());
+    }
+
     // The mask can be alpha-only or per channel. It is applied
     // after the colorfilter
     void setMask(int i, GrTexture* mask) {
@@ -90,6 +96,12 @@ public:
         return fMaskSamplers[i];
     }
 
+    bool isMaskStageEnabled(int i) const {
+        GrAssert((unsigned)i < kMaxTextures);
+        return (NULL != fMaskTextures[i]) ||
+               (NULL != fMaskSamplers[i].getCustomStage());
+    }
+
     // pre-concats sampler matrices for non-NULL textures and masks
     void preConcatActiveSamplerMatrices(const GrMatrix& matrix) {
         for (int i = 0; i < kMaxTextures; ++i) {