Introduce enum class for texture type.

This represents the GL texture "target" but at the API-neutral level. It
will be needed here because proxy's that wrap imported texture's need to
know about sampling restrictions.

Change-Id: Ie811a6f6d04ba1b04faa6908422dca64e8e447c8
Reviewed-on: https://skia-review.googlesource.com/144304
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

2 files changed, 27 insertions, 3 deletions

diff --git a/include/gpu/GrTexture.h b/include/gpu/GrTexture.h
index 215cda1e94..2776567ae8 100644
--- a/include/gpu/GrTexture.h
+++ b/include/gpu/GrTexture.h
@@ -65,8 +65,8 @@ public:
     inline const GrTexturePriv texturePriv() const;
 
 protected:
-    GrTexture(GrGpu*, const GrSurfaceDesc&, GrSLType samplerType,
-              GrSamplerState::Filter highestFilterMode, GrMipMapsStatus);
+    GrTexture(GrGpu*, const GrSurfaceDesc&, GrTextureType, GrSamplerState::Filter highestFilterMode,
+              GrMipMapsStatus);
 
     virtual bool onStealBackendTexture(GrBackendTexture*, SkImage::BackendTextureReleaseProc*) = 0;
 
@@ -76,7 +76,7 @@ private:
     void markMipMapsDirty();
     void markMipMapsClean();
 
-    GrSLType                      fSamplerType;
+    GrTextureType                 fTextureType;
     GrSamplerState::Filter        fHighestFilterMode;
     GrMipMapsStatus               fMipMapsStatus;
     int                           fMaxMipMapLevel;
diff --git a/include/private/GrTypesPriv.h b/include/private/GrTypesPriv.h
index ecd95574f2..db25236e3d 100644
--- a/include/private/GrTypesPriv.h
+++ b/include/private/GrTypesPriv.h
@@ -330,6 +330,17 @@ enum GrSLType {
     kTexture2DRectSampler_GrSLType,
 };
 
+/**
+ * The type of texture. Backends other than GL currently only use the 2D value but the type must
+ * still be known at the API-neutral layer as it used to determine whether MIP maps, renderability,
+ * and sampling parameters are legal for proxies that will be instantiated with wrapped textures.
+ */
+enum class GrTextureType {
+    k2D,
+    kRectangle,
+    kExternal
+};
+
 enum GrShaderType {
     kVertex_GrShaderType,
     kGeometry_GrShaderType,
@@ -479,6 +490,19 @@ static inline int GrSLTypeVecLength(GrSLType type) {
     return -1;
 }
 
+static inline GrSLType GrSLCombinedSamplerTypeForTextureType(GrTextureType type) {
+    switch (type) {
+        case GrTextureType::k2D:
+            return kTexture2DSampler_GrSLType;
+        case GrTextureType::kRectangle:
+            return kTexture2DRectSampler_GrSLType;
+        case GrTextureType::kExternal:
+            return kTextureExternalSampler_GrSLType;
+    }
+    SK_ABORT("Unexpected texture type");
+    return kTexture2DSampler_GrSLType;
+}
+
 static inline bool GrSLTypeIsCombinedSamplerType(GrSLType type) {
     switch (type) {
         case kTexture2DSampler_GrSLType: