Revert "eliminated GrGLSLExpr"

This reverts commit 93f20f5629e52eed732d2b9d6dbbb351cc30b2cd.

Reason for revert: Mismerge readded deleted files.

Original change's description:
> eliminated GrGLSLExpr
> 
> Now that skslc performs all of the optimizations (and then some) that
> GrGLSLExpr is responsible for, it's just extra work for no benefit.
> 
> Bug: skia:
> Change-Id: I40b0629e00a33873ed9fc6c0a9f41d8350221f9a
> Reviewed-on: https://skia-review.googlesource.com/14560
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> 

TBR=bsalomon@google.com,ethannicholas@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: Ia8b723594527afe34489fc78a4b49039081b6390
Reviewed-on: https://skia-review.googlesource.com/15154
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 13 insertions, 12 deletions

diff --git a/src/gpu/glsl/GrGLSLProgramBuilder.h b/src/gpu/glsl/GrGLSLProgramBuilder.h
index 4b1957eb2a..147eb98c98 100644
--- a/src/gpu/glsl/GrGLSLProgramBuilder.h
+++ b/src/gpu/glsl/GrGLSLProgramBuilder.h
@@ -22,7 +22,7 @@
 
 class GrShaderVar;
 class GrGLSLVaryingHandler;
-class SkString;
+class GrGLSLExpr4;
 class GrShaderCaps;
 
 typedef SkSTArray<8, GrGLSLFragmentProcessor*, true> GrGLSLFragProcs;
@@ -110,7 +110,7 @@ protected:
 
     void addFeature(GrShaderFlags shaders, uint32_t featureBit, const char* extensionName);
 
-    bool emitAndInstallProcs();
+    bool emitAndInstallProcs(GrGLSLExpr4* inputColor, GrGLSLExpr4* inputCoverage);
 
     void cleanupFragmentProcessors();
 
@@ -140,18 +140,19 @@ private:
     };
 
     // Generates a possibly mangled name for a stage variable and writes it to the fragment shader.
-    void nameExpression(SkString*, const char* baseName);
+    // If GrGLSLExpr4 has a valid name then it will use that instead
+    void nameExpression(GrGLSLExpr4*, const char* baseName);
 
     void emitAndInstallPrimProc(const GrPrimitiveProcessor&,
-                                SkString* outputColor,
-                                SkString* outputCoverage);
-    void emitAndInstallFragProcs(SkString* colorInOut, SkString* coverageInOut);
-    SkString emitAndInstallFragProc(const GrFragmentProcessor&,
-                                    int index,
-                                    int transformedCoordVarsIdx,
-                                    const SkString& input,
-                                    SkString output);
-    void emitAndInstallXferProc(const SkString& colorIn, const SkString& coverageIn);
+                                GrGLSLExpr4* outputColor,
+                                GrGLSLExpr4* outputCoverage);
+    void emitAndInstallFragProcs(GrGLSLExpr4* colorInOut, GrGLSLExpr4* coverageInOut);
+    void emitAndInstallFragProc(const GrFragmentProcessor&,
+                                int index,
+                                int transformedCoordVarsIdx,
+                                const GrGLSLExpr4& input,
+                                GrGLSLExpr4* output);
+    void emitAndInstallXferProc(const GrGLSLExpr4& colorIn, const GrGLSLExpr4& coverageIn);
     void emitSamplersAndImageStorages(const GrResourceIOProcessor& processor,
                                       SkTArray<SamplerHandle>* outTexSamplerHandles,
                                       SkTArray<SamplerHandle>* outBufferSamplerHandles,