Add a class representing texture swizzle.

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 
@@ skipping 24 matching lines @@
     fImagingSupport = false;
     fVertexArrayObjectSupport = false;
     fDirectStateAccessSupport = false;
     fDebugSupport = false;
     fES2CompatibilitySupport = false;
     fMultisampleDisableSupport = false;
     fUseNonVBOVertexAndIndexDynamicData = false;
     fIsCoreProfile = false;
     fBindFragDataLocationSupport = false;
     fExternalTextureSupport = false;
+    fTextureSwizzleSupport = false;
     fSRGBWriteControl = false;
     fRGBA8888PixelsOpsAreSlow = false;
     fPartialFBOReadIsSlow = false;
 
     fShaderCaps.reset(new GrGLSLCaps(contextOptions));
 
     this->init(contextOptions, ctxInfo, glInterface);
 }
 
 void GrGLCaps::init(const GrContextOptions& contextOptions,
@@ skipping 156 matching lines @@
     if (ctxInfo.hasExtension("GL_OES_EGL_image_external")) {
         if (ctxInfo.glslGeneration() == k110_GrGLSLGeneration) {
             fExternalTextureSupport = true;
         } else if (ctxInfo.hasExtension("GL_OES_EGL_image_external_essl3") ||
                    ctxInfo.hasExtension("OES_EGL_image_external_essl3")) {
             // At least one driver has been found that has this extension without the "GL_" prefix.
             fExternalTextureSupport = true;
         }
     }
 
+    if (kGL_GrGLStandard == standard) {
+        if (version >= GR_GL_VER(3,3) || ctxInfo.hasExtension("GL_ARB_texture_swizzle")) {
+            fTextureSwizzleSupport = true;
+        }
+    } else {
+        if (version >= GR_GL_VER(3,0)) {
+            fTextureSwizzleSupport = true;
+        }
+    }
+
 #ifdef SK_BUILD_FOR_WIN
     // We're assuming that on Windows Chromium we're using ANGLE.
     bool isANGLE = kANGLE_GrGLDriver == ctxInfo.driver() ||
                    kChromium_GrGLDriver == ctxInfo.driver();
     // Angle has slow read/write pixel paths for 32bit RGBA (but fast for BGRA). 
     fRGBA8888PixelsOpsAreSlow = isANGLE;
     // On DX9 ANGLE reading a partial FBO is slow. TODO: Check whether this is still true and
     // check DX11 ANGLE.
     fPartialFBOReadIsSlow = isANGLE;
 #endif
@@ skipping 199 matching lines @@
                 (ctxInfo.hasExtension("GL_ARB_draw_instanced") &&
                  ctxInfo.hasExtension("GL_ARB_instanced_arrays"));
     } else {
         fSupportsInstancedDraws =
                 version >= GR_GL_VER(3, 0) ||
                 (ctxInfo.hasExtension("GL_EXT_draw_instanced") &&
                  ctxInfo.hasExtension("GL_EXT_instanced_arrays"));
     }
 
     this->initShaderPrecisionTable(ctxInfo, gli, glslCaps);
-    // Requires fTexutreSwizzleSupport and fTextureRedSupport to be set before this point.
-    this->initConfigSwizzleTable(ctxInfo, glslCaps);
-    // Requires various members are already correctly initialized (e.g. fTextureRedSupport,
-    // msaa support).
-    this->initConfigTable(ctxInfo, gli);
+
+    if (contextOptions.fUseShaderSwizzling) {
+        fTextureSwizzleSupport = false;
+    }
+
+    // Requires fTextureRedSupport, fTextureSwizzleSupport, msaa support, ES compatibility have
+    // already been detected.
+    this->initConfigTable(ctxInfo, gli, glslCaps);
 
     this->applyOptionsOverrides(contextOptions);
     glslCaps->applyOptionsOverrides(contextOptions);
 }
 
 const char* get_glsl_version_decl_string(GrGLStandard standard, GrGLSLGeneration generation,
                                          bool isCoreProfile) {
     switch (generation) {
         case k110_GrGLSLGeneration:
             if (kGLES_GrGLStandard == standard) {
@@ skipping 404 matching lines @@
     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
     r.appendf("Direct state access support: %s\n", (fDirectStateAccessSupport ? "YES": "NO"));
     r.appendf("Debug support: %s\n", (fDebugSupport ? "YES": "NO"));
     r.appendf("Multisample disable support: %s\n", (fMultisampleDisableSupport ? "YES" : "NO"));
     r.appendf("Use non-VBO for dynamic data: %s\n",
              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
     r.appendf("SRGB write contol: %s\n", (fSRGBWriteControl ? "YES" : "NO"));
     r.appendf("RGBA 8888 pixel ops are slow: %s\n", (fRGBA8888PixelsOpsAreSlow ? "YES" : "NO"));
     r.appendf("Partial FBO read is slow: %s\n", (fPartialFBOReadIsSlow ? "YES" : "NO"));
     r.appendf("Bind uniform location support: %s\n", (fBindUniformLocationSupport ? "YES" : "NO"));
+    r.appendf("External texture support: %s\n", (fExternalTextureSupport ? "YES" : "NO"));
+    r.appendf("Texture swizzle support: %s\n", (fTextureSwizzleSupport ? "YES" : "NO"));
 
     r.append("Configs\n-------\n");
     for (int i = 0; i < kGrPixelConfigCnt; ++i) {
         r.appendf("  cfg: %d flags: 0x%04x, b_internal: 0x%08x s_internal: 0x%08x, e_format: "
                   "0x%08x, e_type: 0x%08x, i_for_teximage: 0x%08x, e_for_teximage: 0x%08x\n",
                   i,
                   fConfigTable[i].fFlags,
                   fConfigTable[i].fFormats.fBaseInternalFormat,
                   fConfigTable[i].fFormats.fSizedInternalFormat,
                   fConfigTable[i].fFormats.fExternalFormat,
@@ skipping 82 matching lines @@
     // highp. GS was added after GetShaderPrecisionFormat was added to the list of features that
     // are recommended against.
     if (glslCaps->fGeometryShaderSupport) {
         for (int p = 0; p < kGrSLPrecisionCount; ++p) {
             glslCaps->fFloatPrecisions[kGeometry_GrShaderType][p] = 
                                                glslCaps->fFloatPrecisions[kVertex_GrShaderType][p];
         }
     }
 }
 
-void GrGLCaps::initConfigSwizzleTable(const GrGLContextInfo& ctxInfo, GrGLSLCaps* glslCaps) {
-    GrGLStandard standard = ctxInfo.standard();
-    GrGLVersion version = ctxInfo.version();
-
-    glslCaps->fMustSwizzleInShader = true;
-    if (kGL_GrGLStandard == standard) {
-        if (version >= GR_GL_VER(3,3) || ctxInfo.hasExtension("GL_ARB_texture_swizzle")) {
-            glslCaps->fMustSwizzleInShader = false;
-        }
-    } else {
-        if (version >= GR_GL_VER(3,0)) {
-            glslCaps->fMustSwizzleInShader = false;
-        }
-    }
-
-    glslCaps->fConfigSwizzle[kUnknown_GrPixelConfig] = nullptr;
-    if (fTextureRedSupport) {
-        glslCaps->fConfigSwizzle[kAlpha_8_GrPixelConfig] = "rrrr";
-        glslCaps->fConfigSwizzle[kAlpha_half_GrPixelConfig] = "rrrr";
-    } else {
-        glslCaps->fConfigSwizzle[kAlpha_8_GrPixelConfig] = "aaaa";
-        glslCaps->fConfigSwizzle[kAlpha_half_GrPixelConfig] = "aaaa";
-    }
-    glslCaps->fConfigSwizzle[kIndex_8_GrPixelConfig] = "rgba";
-    glslCaps->fConfigSwizzle[kRGB_565_GrPixelConfig] = "rgba";
-    glslCaps->fConfigSwizzle[kRGBA_4444_GrPixelConfig] = "rgba";
-    glslCaps->fConfigSwizzle[kRGBA_8888_GrPixelConfig] = "rgba";
-    glslCaps->fConfigSwizzle[kBGRA_8888_GrPixelConfig] = "rgba";
-    glslCaps->fConfigSwizzle[kSRGBA_8888_GrPixelConfig] = "rgba";
-    glslCaps->fConfigSwizzle[kETC1_GrPixelConfig] = "rgba";
-    glslCaps->fConfigSwizzle[kLATC_GrPixelConfig] = "rrrr";
-    glslCaps->fConfigSwizzle[kR11_EAC_GrPixelConfig] = "rrrr";
-    glslCaps->fConfigSwizzle[kASTC_12x12_GrPixelConfig] = "rgba";
-    glslCaps->fConfigSwizzle[kRGBA_float_GrPixelConfig] = "rgba";
-    glslCaps->fConfigSwizzle[kRGBA_half_GrPixelConfig] = "rgba";
-
-}
-
 bool GrGLCaps::bgraIsInternalFormat() const {
     return fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fBaseInternalFormat == GR_GL_BGRA;
 }
 
-void GrGLCaps::initConfigTable(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
+void GrGLCaps::initConfigTable(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli,
+                               GrGLSLCaps* glslCaps) {
     /*
         Comments on renderability of configs on various GL versions.
           OpenGL < 3.0:
             no built in support for render targets.
             GL_EXT_framebuffer_object adds possible support for any sized format with base internal
               format RGB, RGBA and NV float formats we don't use.
               This is the following:
                 R3_G3_B2, RGB4, RGB5, RGB8, RGB10, RGB12, RGB16, RGBA2, RGBA4, RGB5_A1, RGBA8
                 RGB10_A2, RGBA12,RGBA16
               Though, it is hard to believe the more obscure formats such as RGBA12 would work
@@ skipping 62 matching lines @@
     }
 
     GrGLStandard standard = ctxInfo.standard();
     GrGLVersion version = ctxInfo.version();
 
     fConfigTable[kUnknown_GrPixelConfig].fFormats.fBaseInternalFormat = 0;
     fConfigTable[kUnknown_GrPixelConfig].fFormats.fSizedInternalFormat = 0;
     fConfigTable[kUnknown_GrPixelConfig].fFormats.fExternalFormat = 0;
     fConfigTable[kUnknown_GrPixelConfig].fFormats.fExternalType = 0;
     fConfigTable[kUnknown_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
+    fConfigTable[kUnknown_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     fConfigTable[kRGBA_8888_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA;
     fConfigTable[kRGBA_8888_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA8;
     fConfigTable[kRGBA_8888_GrPixelConfig].fFormats.fExternalFormat = GR_GL_RGBA;
     fConfigTable[kRGBA_8888_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_BYTE;
     fConfigTable[kRGBA_8888_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
     fConfigTable[kRGBA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
     if (kGL_GrGLStandard == standard) {
         // We require some form of FBO support and all GLs with FBO support can render to RGBA8
         fConfigTable[kRGBA_8888_GrPixelConfig].fFlags |= allRenderFlags;
     } else {
         if (version >= GR_GL_VER(3,0) || ctxInfo.hasExtension("GL_OES_rgb8_rgba8") ||
             ctxInfo.hasExtension("GL_ARM_rgba8")) {
             fConfigTable[kRGBA_8888_GrPixelConfig].fFlags |= allRenderFlags;
         }
     }
+    fConfigTable[kRGBA_8888_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fExternalFormat= GR_GL_BGRA;
     fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fExternalType  = GR_GL_UNSIGNED_BYTE;
     fConfigTable[kBGRA_8888_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
     if (kGL_GrGLStandard == standard) {
         fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA;
         fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA8;
         if (version >= GR_GL_VER(1, 2) || ctxInfo.hasExtension("GL_EXT_bgra")) {
             // Since the internal format is RGBA8, it is also renderable.
             fConfigTable[kBGRA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
@@ skipping 15 matching lines @@
         } else if (ctxInfo.hasExtension("GL_EXT_texture_format_BGRA8888")) {
             fConfigTable[kBGRA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
                                                             ConfigInfo::kRenderable_Flag;
             if (ctxInfo.hasExtension("GL_CHROMIUM_renderbuffer_format_BGRA8888") &&
                 this->usesMSAARenderBuffers()) {
                 fConfigTable[kBGRA_8888_GrPixelConfig].fFlags |=
                     ConfigInfo::kRenderableWithMSAA_Flag;
             }
         }
     }
+    fConfigTable[kBGRA_8888_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     // We only enable srgb support if both textures and FBOs support srgb.
     bool srgbSupport = false;
     if (kGL_GrGLStandard == standard) {
         if (ctxInfo.version() >= GR_GL_VER(3,0)) {
             srgbSupport = true;
         } else if (ctxInfo.hasExtension("GL_EXT_texture_sRGB")) {
             if (ctxInfo.hasExtension("GL_ARB_framebuffer_sRGB") ||
                 ctxInfo.hasExtension("GL_EXT_framebuffer_sRGB")) {
                 srgbSupport = true;
@@ skipping 13 matching lines @@
     fConfigTable[kSRGBA_8888_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_SRGB8_ALPHA8;
     // GL does not do srgb<->rgb conversions when transferring between cpu and gpu. Thus, the
     // external format is GL_RGBA. See below for note about ES2.0 and glTex[Sub]Image.
     fConfigTable[kSRGBA_8888_GrPixelConfig].fFormats.fExternalFormat = GR_GL_RGBA;
     fConfigTable[kSRGBA_8888_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_BYTE;
     fConfigTable[kSRGBA_8888_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
     if (srgbSupport) {
         fConfigTable[kSRGBA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
                                                          allRenderFlags;
     }
+    fConfigTable[kSRGBA_8888_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     fConfigTable[kRGB_565_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGB;
     if (this->ES2CompatibilitySupport()) {
         fConfigTable[kRGB_565_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGB565;
     } else {
         fConfigTable[kRGB_565_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGB5;
     }
     fConfigTable[kRGB_565_GrPixelConfig].fFormats.fExternalFormat = GR_GL_RGB;
     fConfigTable[kRGB_565_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_SHORT_5_6_5;
     fConfigTable[kRGB_565_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
     fConfigTable[kRGB_565_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
     if (kGL_GrGLStandard == standard) {
         if (version >= GR_GL_VER(4, 2) || ctxInfo.hasExtension("GL_ES2_compatibility")) {
             fConfigTable[kRGB_565_GrPixelConfig].fFlags |= allRenderFlags;
         }
     } else {
         fConfigTable[kRGB_565_GrPixelConfig].fFlags |= allRenderFlags;
     }
+    fConfigTable[kRGB_565_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     fConfigTable[kRGBA_4444_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA;
     fConfigTable[kRGBA_4444_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA4;
     fConfigTable[kRGBA_4444_GrPixelConfig].fFormats.fExternalFormat = GR_GL_RGBA;
     fConfigTable[kRGBA_4444_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_SHORT_4_4_4_4;
     fConfigTable[kRGBA_4444_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
     fConfigTable[kRGBA_4444_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
     if (kGL_GrGLStandard == standard) {
         if (version >= GR_GL_VER(4, 2)) {
             fConfigTable[kRGBA_4444_GrPixelConfig].fFlags |= allRenderFlags;
         }
     } else {
         fConfigTable[kRGBA_4444_GrPixelConfig].fFlags |= allRenderFlags;
     }
+    fConfigTable[kRGBA_4444_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     if (this->textureRedSupport()) {
         fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RED;
         fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_R8;
         fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fExternalFormat = GR_GL_RED;
+        fConfigTable[kAlpha_8_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
     } else {
         fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_ALPHA;
         fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_ALPHA8;
         fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fExternalFormat = GR_GL_ALPHA;
+        fConfigTable[kAlpha_8_GrPixelConfig].fSwizzle = GrSwizzle::AAAA();
     }
     fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_BYTE;
     fConfigTable[kAlpha_8_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
     fConfigTable[kAlpha_8_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
     if (this->textureRedSupport() || kDesktop_ARB_MSFBOType == this->msFBOType()) {
         // desktop ARB extension/3.0+ supports ALPHA8 as renderable.
         // Core profile removes ALPHA8 support, but we should have chosen R8 in that case.
         fConfigTable[kAlpha_8_GrPixelConfig].fFlags |= allRenderFlags;
     }
 
@@ skipping 35 matching lines @@
     fConfigTable[kRGBA_float_GrPixelConfig].fFormatType = kFloat_FormatType;
     if (hasFPTextures) {
         fConfigTable[kRGBA_float_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
         // For now we only enable rendering to float on desktop, because on ES we'd have to solve
         // many precision issues and no clients actually want this yet.
         if (kGL_GrGLStandard == standard /* || version >= GR_GL_VER(3,2) ||
             ctxInfo.hasExtension("GL_EXT_color_buffer_float")*/) {
             fConfigTable[kRGBA_float_GrPixelConfig].fFlags |= fpRenderFlags;
         }
     }
+    fConfigTable[kRGBA_float_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     if (this->textureRedSupport()) {
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RED;
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_R16F;
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fExternalFormat = GR_GL_RED;
+        fConfigTable[kAlpha_half_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
     } else {
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_ALPHA;
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_ALPHA16F;
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fExternalFormat = GR_GL_ALPHA;
+        fConfigTable[kAlpha_half_GrPixelConfig].fSwizzle = GrSwizzle::AAAA();
     }
     if (kGL_GrGLStandard == ctxInfo.standard() || ctxInfo.version() >= GR_GL_VER(3, 0)) {
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fExternalType = GR_GL_HALF_FLOAT;
     } else {
         fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fExternalType = GR_GL_HALF_FLOAT_OES;
     }
     fConfigTable[kAlpha_half_GrPixelConfig].fFormatType = kFloat_FormatType;
     if (hasHalfFPTextures) {
         fConfigTable[kAlpha_half_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
         // ES requires either 3.2 or the combination of EXT_color_buffer_half_float and support for
@@ skipping 15 matching lines @@
     }
     fConfigTable[kRGBA_half_GrPixelConfig].fFormatType = kFloat_FormatType;
     if (hasHalfFPTextures) {
         fConfigTable[kRGBA_half_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
         // ES requires 3.2 or EXT_color_buffer_half_float.
         if (kGL_GrGLStandard == standard || version >= GR_GL_VER(3,2) ||
              ctxInfo.hasExtension("GL_EXT_color_buffer_half_float")) {
             fConfigTable[kRGBA_half_GrPixelConfig].fFlags |= fpRenderFlags;
         }
     }
+    fConfigTable[kRGBA_half_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     // Compressed texture support
 
     // glCompressedTexImage2D is available on all OpenGL ES devices. It is available on standard
     // OpenGL after version 1.3. We'll assume at least that level of OpenGL support.
 
     // TODO: Fix command buffer bindings and remove this.
     fCompressedTexSubImageSupport = SkToBool(gli->fFunctions.fCompressedTexSubImage2D);
 
     // No sized/unsized internal format distinction for compressed formats, no external format.
@@ skipping 13 matching lines @@
             SkAutoSTMalloc<10, GrGLint> formats(numFormats);
             GR_GL_GetIntegerv(gli, GR_GL_COMPRESSED_TEXTURE_FORMATS, formats);
             for (int i = 0; i < numFormats; ++i) {
                 if (GR_GL_PALETTE8_RGBA8 == formats[i]) {
                     fConfigTable[kIndex_8_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
                     break;
                 }
             }
         }
     }
+    fConfigTable[kIndex_8_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     // May change the internal format based on extensions.
     fConfigTable[kLATC_GrPixelConfig].fFormats.fBaseInternalFormat =
         GR_GL_COMPRESSED_LUMINANCE_LATC1;
     fConfigTable[kLATC_GrPixelConfig].fFormats.fSizedInternalFormat =
         GR_GL_COMPRESSED_LUMINANCE_LATC1;
     if (ctxInfo.hasExtension("GL_EXT_texture_compression_latc") ||
         ctxInfo.hasExtension("GL_NV_texture_compression_latc")) {
         fConfigTable[kLATC_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
     } else if ((kGL_GrGLStandard == standard && version >= GR_GL_VER(3, 0)) ||
                ctxInfo.hasExtension("GL_EXT_texture_compression_rgtc") ||
                ctxInfo.hasExtension("GL_ARB_texture_compression_rgtc")) {
         // RGTC is identical and available on OpenGL 3.0+ as well as with extensions
         fConfigTable[kLATC_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
         fConfigTable[kLATC_GrPixelConfig].fFormats.fBaseInternalFormat =
             GR_GL_COMPRESSED_RED_RGTC1;
         fConfigTable[kLATC_GrPixelConfig].fFormats.fSizedInternalFormat =
             GR_GL_COMPRESSED_RED_RGTC1;
     } else if (ctxInfo.hasExtension("GL_AMD_compressed_3DC_texture")) {
         fConfigTable[kLATC_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
         fConfigTable[kLATC_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_COMPRESSED_3DC_X;
         fConfigTable[kLATC_GrPixelConfig].fFormats.fSizedInternalFormat =
             GR_GL_COMPRESSED_3DC_X;
 
     }
     fConfigTable[kLATC_GrPixelConfig].fFormats.fExternalFormat = 0;
     fConfigTable[kLATC_GrPixelConfig].fFormats.fExternalType = 0;
     fConfigTable[kLATC_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
+    fConfigTable[kLATC_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
 
     fConfigTable[kETC1_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_COMPRESSED_ETC1_RGB8;
     fConfigTable[kETC1_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_COMPRESSED_ETC1_RGB8;
     fConfigTable[kETC1_GrPixelConfig].fFormats.fExternalFormat = 0;
     fConfigTable[kETC1_GrPixelConfig].fFormats.fExternalType = 0;
     fConfigTable[kETC1_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
     if (kGL_GrGLStandard == standard) {
         if (version >= GR_GL_VER(4, 3) || ctxInfo.hasExtension("GL_ARB_ES3_compatibility")) {
             fConfigTable[kETC1_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
         }
     } else {
         if (version >= GR_GL_VER(3, 0) ||
             ctxInfo.hasExtension("GL_OES_compressed_ETC1_RGB8_texture") ||
             // ETC2 is a superset of ETC1, so we can just check for that, too.
             (ctxInfo.hasExtension("GL_OES_compressed_ETC2_RGB8_texture") &&
              ctxInfo.hasExtension("GL_OES_compressed_ETC2_RGBA8_texture"))) {
             fConfigTable[kETC1_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
         }
     }
+    fConfigTable[kETC1_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     fConfigTable[kR11_EAC_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_COMPRESSED_R11_EAC;
     fConfigTable[kR11_EAC_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_COMPRESSED_R11_EAC;
     fConfigTable[kR11_EAC_GrPixelConfig].fFormats.fExternalFormat = 0;
     fConfigTable[kR11_EAC_GrPixelConfig].fFormats.fExternalType = 0;
     fConfigTable[kR11_EAC_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
     // Check for R11_EAC. We don't support R11_EAC on desktop, as most cards default to
     // decompressing the textures in the driver, and is generally slower.
     if (kGLES_GrGLStandard == standard && version >= GR_GL_VER(3,0)) {
         fConfigTable[kR11_EAC_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
     }
+    fConfigTable[kR11_EAC_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
 
     fConfigTable[kASTC_12x12_GrPixelConfig].fFormats.fBaseInternalFormat =
         GR_GL_COMPRESSED_RGBA_ASTC_12x12;
     fConfigTable[kASTC_12x12_GrPixelConfig].fFormats.fSizedInternalFormat =
         GR_GL_COMPRESSED_RGBA_ASTC_12x12;
     fConfigTable[kASTC_12x12_GrPixelConfig].fFormats.fExternalFormat = 0;
     fConfigTable[kASTC_12x12_GrPixelConfig].fFormats.fExternalType = 0;
     fConfigTable[kASTC_12x12_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
     if (ctxInfo.hasExtension("GL_KHR_texture_compression_astc_hdr") ||
         ctxInfo.hasExtension("GL_KHR_texture_compression_astc_ldr") ||
         ctxInfo.hasExtension("GL_OES_texture_compression_astc")) {
         fConfigTable[kASTC_12x12_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
     }
+    fConfigTable[kASTC_12x12_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
 
     // Bulk populate the texture internal/external formats here and then deal with exceptions below.
 
     // ES 2.0 requires that the internal/external formats match.
     bool useSizedFormats = (kGL_GrGLStandard == ctxInfo.standard() ||
                             ctxInfo.version() >= GR_GL_VER(3,0));
     for (int i = 0; i < kGrPixelConfigCnt; ++i) {
         // Almost always we want to pass fExternalFormat as the <format> param to glTex[Sub]Image.
         fConfigTable[i].fFormats.fExternalFormatForTexImage =
             fConfigTable[i].fFormats.fExternalFormat;
@@ skipping 17 matching lines @@
     //      2.0 and therefore doesn't define a value for GL_BGRA8 as ES 2.0 uses unsized internal
     //      formats.
     // GL_APPLE_texture_format_BGRA8888: 
     //     ES 2.0: the extension makes BGRA an external format but not an internal format.
     //     ES 3.0: the extension explicitly states GL_BGRA8 is not a valid internal format for
     //             glTexImage (just for glTexStorage).
     if (useSizedFormats && this->bgraIsInternalFormat())  {
         fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fInternalFormatTexImage = GR_GL_BGRA;
     }
 
+    // If we don't have texture swizzle support then the shader generator must insert the
+    // swizzle into shader code.
+    if (!this->textureSwizzleSupport()) {
+        for (int i = 0; i < kGrPixelConfigCnt; ++i) {
+            glslCaps->fConfigTextureSwizzle[i] = fConfigTable[i].fSwizzle;
+        }
+    }
+
 #ifdef SK_DEBUG
     // Make sure we initialized everything.
     ConfigFormats defaultEntry;
     for (int i = 0; i < kGrPixelConfigCnt; ++i) {
         SkASSERT(defaultEntry.fBaseInternalFormat != fConfigTable[i].fFormats.fBaseInternalFormat);
         SkASSERT(defaultEntry.fSizedInternalFormat !=
                  fConfigTable[i].fFormats.fSizedInternalFormat);
         SkASSERT(defaultEntry.fExternalFormat != fConfigTable[i].fFormats.fExternalFormat);
         SkASSERT(defaultEntry.fExternalType != fConfigTable[i].fFormats.fExternalType);
     }
 #endif
 }
 
 void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {}