Reduce gets of ext string and check validity of stencil format enums

Review URL: http://codereview.appspot.com/4678043/



git-svn-id: http://skia.googlecode.com/svn/trunk@1801 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 23 insertions, 0 deletions

diff --git a/gpu/src/GrGpuGL.h b/gpu/src/GrGpuGL.h
index aec55d8b7b..7f13ea11a4 100644
--- a/gpu/src/GrGpuGL.h
+++ b/gpu/src/GrGpuGL.h
@@ -25,6 +25,8 @@
 #include "GrGLVertexBuffer.h"
 #include "GrGLIndexBuffer.h"
 
+#include "SkString.h"
+
 class GrGpuGL : public GrGpu {
 public:
     virtual ~GrGpuGL();
@@ -48,6 +50,10 @@ protected:
     DrState   fHWDrawState;
     bool      fHWStencilClip;
 
+    // read these once at begining and then never again
+    SkString fExtensionString;
+    float fGLVersion;
+
     // As flush of GL state proceeds it updates fHDrawState
     // to reflect the new state. Later parts of the state flush
     // may perform cascaded changes but cannot refer to fHWDrawState.
@@ -127,6 +133,10 @@ protected:
                     GrBlendCoeff srcCoeff,
                     GrBlendCoeff dstCoeff);
 
+    bool hasExtension(const char* ext) {
+        return has_gl_extension_from_string(ext, fExtensionString.c_str());
+    }
+
     // adjusts texture matrix to account for orientation, size, and npotness
     static void AdjustTextureMatrix(const GrGLTexture* texture,
                                     GrSamplerState::SampleMode mode,
@@ -142,6 +152,9 @@ protected:
 
 private:
 
+    // determines valid stencil formats
+    void setupStencilFormats();
+
     // notify callbacks to update state tracking when related
     // objects are bound to GL or deleted outside of the class
     void notifyVertexBufferBind(const GrGLVertexBuffer* buffer);
@@ -175,6 +188,16 @@ private:
     friend class GrGLTexture;
     friend class GrGLRenderTarget;
 
+    static const GrGLuint gUNKNOWN_BITCOUNT = ~0;
+
+    struct StencilFormat {
+        GrGLenum  fEnum;
+        GrGLuint  fBits;
+        bool      fPacked;
+    };
+
+    GrTArray<StencilFormat, true> fStencilFormats;
+
     bool fHWBlendDisabled;
 
     GrGLuint fAASamples[4];