Implement texel buffers

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 0322a0f57cdf23812eecf9d0b162b28c96ba38f8..f3e494acb90cfd2e1d1fd8003dd18ba395357988 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -1382,6 +1382,8 @@ void GrGLCaps::initConfigTable(const GrGLContextInfo& ctxInfo, const GrGLInterfa
         texStorageSupported = false;
     }
 
+    bool texelBufferSupport = this->shaderCaps()->texelBufferSupport();
+
     fConfigTable[kUnknown_GrPixelConfig].fFormats.fBaseInternalFormat = 0;
     fConfigTable[kUnknown_GrPixelConfig].fFormats.fSizedInternalFormat = 0;
     fConfigTable[kUnknown_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] = 0;
@@ -1408,6 +1410,9 @@ void GrGLCaps::initConfigTable(const GrGLContextInfo& ctxInfo, const GrGLInterfa
     if (texStorageSupported) {
         fConfigTable[kRGBA_8888_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
     }
+    if (texelBufferSupport) {
+        fConfigTable[kRGBA_8888_GrPixelConfig].fFlags |= ConfigInfo::kCanUseWithTexelBuffer_Flag;
+    }
     fConfigTable[kRGBA_8888_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
@@ -1567,6 +1572,9 @@ void GrGLCaps::initConfigTable(const GrGLContextInfo& ctxInfo, const GrGLInterfa
         fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
             GR_GL_RED;
         fConfigTable[kAlpha_8_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
+        if (texelBufferSupport) {
+            fConfigTable[kAlpha_8_GrPixelConfig].fFlags |= ConfigInfo::kCanUseWithTexelBuffer_Flag;
+        }
     } else {
         fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_ALPHA;
         fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_ALPHA8;
@@ -1635,6 +1643,9 @@ void GrGLCaps::initConfigTable(const GrGLContextInfo& ctxInfo, const GrGLInterfa
     if (texStorageSupported) {
         fConfigTable[kRGBA_float_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
     }
+    if (texelBufferSupport) {
+        fConfigTable[kRGBA_float_GrPixelConfig].fFlags |= ConfigInfo::kCanUseWithTexelBuffer_Flag;
+    }
     fConfigTable[kRGBA_float_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     if (this->textureRedSupport()) {
@@ -1643,6 +1654,10 @@ void GrGLCaps::initConfigTable(const GrGLContextInfo& ctxInfo, const GrGLInterfa
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage]
             = GR_GL_RED;
         fConfigTable[kAlpha_half_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
+        if (texelBufferSupport) {
+            fConfigTable[kAlpha_half_GrPixelConfig].fFlags |=
+                ConfigInfo::kCanUseWithTexelBuffer_Flag;
+        }
     } else {
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_ALPHA;
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_ALPHA16F;
@@ -1691,6 +1706,9 @@ void GrGLCaps::initConfigTable(const GrGLContextInfo& ctxInfo, const GrGLInterfa
     if (texStorageSupported) {
         fConfigTable[kRGBA_half_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
     }
+    if (texelBufferSupport) {
+        fConfigTable[kRGBA_half_GrPixelConfig].fFlags |= ConfigInfo::kCanUseWithTexelBuffer_Flag;
+    }
     fConfigTable[kRGBA_half_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     // Compressed texture support