Add detection of image load/store to caps

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4861

Change-Id: Ibf70cce9f61553e830b62339551c1541dc054e8b
Reviewed-on: https://skia-review.googlesource.com/4861
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/src/gpu/glsl/GrGLSLCaps.cpp b/src/gpu/glsl/GrGLSLCaps.cpp
index 8e464b07e4..5bb22b3974 100644
--- a/src/gpu/glsl/GrGLSLCaps.cpp
+++ b/src/gpu/glsl/GrGLSLCaps.cpp
@@ -42,10 +42,15 @@ GrGLSLCaps::GrGLSLCaps(const GrContextOptions& options) {
     fSampleVariablesExtensionString = nullptr;
     fFBFetchColorName = nullptr;
     fFBFetchExtensionString = nullptr;
+    fImageLoadStoreExtensionString = nullptr;
     fMaxVertexSamplers = 0;
     fMaxGeometrySamplers = 0;
     fMaxFragmentSamplers = 0;
     fMaxCombinedSamplers = 0;
+    fMaxVertexImages = 0;
+    fMaxGeometryImages = 0;
+    fMaxFragmentImages = 0;
+    fMaxCombinedImages   = 0;
     fAdvBlendEqInteraction = kNotSupported_AdvBlendEqInteraction;
 }
 
@@ -90,6 +95,10 @@ SkString GrGLSLCaps::dump() const {
     r.appendf("Max GS Samplers: %d\n", fMaxGeometrySamplers);
     r.appendf("Max FS Samplers: %d\n", fMaxFragmentSamplers);
     r.appendf("Max Combined Samplers: %d\n", fMaxFragmentSamplers);
+    r.appendf("Max VS Images: %d\n", fMaxVertexImages);
+    r.appendf("Max GS Images: %d\n", fMaxGeometryImages);
+    r.appendf("Max FS Images: %d\n", fMaxFragmentImages);
+    r.appendf("Max Combined Images: %d\n", fMaxFragmentImages);
     r.appendf("Advanced blend equation interaction: %s\n",
               kAdvBlendEqInteractionStr[fAdvBlendEqInteraction]);
     return r;
diff --git a/src/gpu/glsl/GrGLSLCaps.h b/src/gpu/glsl/GrGLSLCaps.h
index 137c9b76b7..4c53ad02fd 100644
--- a/src/gpu/glsl/GrGLSLCaps.h
+++ b/src/gpu/glsl/GrGLSLCaps.h
@@ -144,6 +144,11 @@ public:
         return fSampleVariablesExtensionString;
     }
 
+    const char* imageLoadStoreExtensionString() const {
+        SkASSERT(this->imageLoadStoreSupport());
+        return fImageLoadStoreExtensionString;
+    }
+
     int maxVertexSamplers() const { return fMaxVertexSamplers; }
 
     int maxGeometrySamplers() const { return fMaxGeometrySamplers; }
@@ -152,6 +157,14 @@ public:
 
     int maxCombinedSamplers() const { return fMaxCombinedSamplers; }
 
+    int maxVertexImages() const { return fMaxVertexImages; }
+
+    int maxGeometryImages() const { return fMaxGeometryImages; }
+
+    int maxFragmentImages() const { return fMaxFragmentImages; }
+
+    int maxCombinedImages() const { return fMaxCombinedImages; }
+
     /**
      * Given a texture's config, this determines what swizzle must be appended to accesses to the
      * texture in generated shader code. Swizzling may be implemented in texture parameters or a
@@ -215,6 +228,7 @@ private:
     const char* fNoPerspectiveInterpolationExtensionString;
     const char* fMultisampleInterpolationExtensionString;
     const char* fSampleVariablesExtensionString;
+    const char* fImageLoadStoreExtensionString;
 
     const char* fFBFetchColorName;
     const char* fFBFetchExtensionString;
@@ -224,6 +238,11 @@ private:
     int fMaxFragmentSamplers;
     int fMaxCombinedSamplers;
 
+    int fMaxVertexImages;
+    int fMaxGeometryImages;
+    int fMaxFragmentImages;
+    int fMaxCombinedImages;
+
     AdvBlendEqInteraction fAdvBlendEqInteraction;
 
     GrSwizzle fConfigTextureSwizzle[kGrPixelConfigCnt];