Remove GrResourceIOProcessor.

Fold its functionality into GrPrimitiveProcessor and GrFragmentProcessor.

Make each have its own TextureSampler nested class. Currently the only
difference is that fragment processors lose the ability to inject their
samplers into the vertex shader. However, this facilitates refactoring
GrPrimitiveProcessor's TextureSampler class such that the textures are
specified separately from the TextureSampler.

Bug: skia:
Change-Id: I1e590187e7a6ae79ee3147155d397fcdcf5e4619
Reviewed-on: https://skia-review.googlesource.com/142814
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

1 files changed, 95 insertions, 6 deletions

diff --git a/src/gpu/GrPrimitiveProcessor.h b/src/gpu/GrPrimitiveProcessor.h
index cc24b64a87..d5d5d5f747 100644
--- a/src/gpu/GrPrimitiveProcessor.h
+++ b/src/gpu/GrPrimitiveProcessor.h
@@ -40,8 +40,10 @@ class GrGLSLPrimitiveProcessor;
  * GrPrimitiveProcessors must proivide seed color and coverage for the Ganesh color / coverage
  * pipelines, and they must provide some notion of equality
  */
-class GrPrimitiveProcessor : public GrResourceIOProcessor, public GrProgramElement {
+class GrPrimitiveProcessor : public GrProcessor, public GrProgramElement {
 public:
+    class TextureSampler;
+
     /** Describes a vertex or instance attribute. */
     class Attribute {
     public:
@@ -70,6 +72,8 @@ public:
 
     GrPrimitiveProcessor(ClassID);
 
+    int numTextureSamplers() const { return fTextureSamplerCnt; }
+    const TextureSampler& textureSampler(int index) const;
     int numVertexAttributes() const { return fVertexAttributeCnt; }
     const Attribute& vertexAttribute(int i) const;
     int numInstanceAttributes() const { return fInstanceAttributeCnt; }
@@ -131,27 +135,112 @@ public:
 
     virtual float getSampleShading() const { return 0.0; }
 
+    bool instantiate(GrResourceProvider*) const;
+
 protected:
-    void setVertexAttributeCnt(int cnt) { fVertexAttributeCnt = cnt; }
-    void setInstanceAttributeCnt(int cnt) { fInstanceAttributeCnt = cnt; }
+    void setVertexAttributeCnt(int cnt) {
+        SkASSERT(cnt >= 0);
+        fVertexAttributeCnt = cnt;
+    }
+    void setInstanceAttributeCnt(int cnt) {
+        SkASSERT(cnt >= 0);
+        fInstanceAttributeCnt = cnt;
+    }
+    void setTextureSamplerCnt(int cnt) {
+        SkASSERT(cnt >= 0);
+        fTextureSamplerCnt = cnt;
+    }
+
+    /**
+     * Helper for implementing onTextureSampler(). E.g.:
+     * return IthTexureSampler(i, fMyFirstSampler, fMySecondSampler, fMyThirdSampler);
+     */
+    template <typename... Args>
+    static const TextureSampler& IthTextureSampler(int i, const TextureSampler& samp0,
+                                                   const Args&... samps) {
+        return (0 == i) ? samp0 : IthTextureSampler(i - 1, samps...);
+    }
+    inline static const TextureSampler& IthTextureSampler(int i);
 
 private:
-    void addPendingIOs() const override { GrResourceIOProcessor::addPendingIOs(); }
-    void removeRefs() const override { GrResourceIOProcessor::removeRefs(); }
-    void pendingIOComplete() const override { GrResourceIOProcessor::pendingIOComplete(); }
+    void addPendingIOs() const final;
+    void removeRefs() const final;
+    void pendingIOComplete() const final;
     void notifyRefCntIsZero() const final {}
 
     virtual const Attribute& onVertexAttribute(int) const = 0;
     virtual const Attribute& onInstanceAttribute(int) const = 0;
+    virtual const TextureSampler& onTextureSampler(int) const { return IthTextureSampler(0); }
 
     int fVertexAttributeCnt = 0;
     int fInstanceAttributeCnt = 0;
+    int fTextureSamplerCnt = 0;
     typedef GrProcessor INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 /**
+ * Used to represent a texture that is required by a GrPrimitiveProcessor. It holds a GrTextureProxy
+ * along with an associated GrSamplerState. TextureSamplers don't perform any coord manipulation to
+ * account for texture origin.
+ */
+class GrPrimitiveProcessor::TextureSampler {
+public:
+    TextureSampler() = default;
+
+    TextureSampler(sk_sp<GrTextureProxy>, const GrSamplerState&, GrShaderFlags visibility);
+
+    explicit TextureSampler(sk_sp<GrTextureProxy>,
+                            GrSamplerState::Filter = GrSamplerState::Filter::kNearest,
+                            GrSamplerState::WrapMode wrapXAndY = GrSamplerState::WrapMode::kClamp,
+                            GrShaderFlags visibility = kFragment_GrShaderFlag);
+
+    TextureSampler(const TextureSampler&) = delete;
+    TextureSampler& operator=(const TextureSampler&) = delete;
+
+    void reset(sk_sp<GrTextureProxy>, const GrSamplerState&,
+               GrShaderFlags visibility = kFragment_GrShaderFlag);
+    void reset(sk_sp<GrTextureProxy>,
+               GrSamplerState::Filter = GrSamplerState::Filter::kNearest,
+               GrSamplerState::WrapMode wrapXAndY = GrSamplerState::WrapMode::kClamp,
+               GrShaderFlags visibility = kFragment_GrShaderFlag);
+
+    bool instantiate(GrResourceProvider* resourceProvider) const {
+        return SkToBool(fProxyRef.get()->instantiate(resourceProvider));
+    }
+
+    // 'peekTexture' should only ever be called after a successful 'instantiate' call
+    GrTexture* peekTexture() const {
+        SkASSERT(fProxyRef.get()->priv().peekTexture());
+        return fProxyRef.get()->priv().peekTexture();
+    }
+
+    GrTextureProxy* proxy() const { return fProxyRef.get()->asTextureProxy(); }
+    GrShaderFlags visibility() const { return fVisibility; }
+    const GrSamplerState& samplerState() const { return fSamplerState; }
+
+    bool isInitialized() const { return SkToBool(fProxyRef.get()); }
+    /**
+     * For internal use by GrPrimitiveProcessor.
+     */
+    const GrSurfaceProxyRef* programProxy() const { return &fProxyRef; }
+
+private:
+    GrSurfaceProxyRef fProxyRef;
+    GrSamplerState fSamplerState;
+    GrShaderFlags fVisibility = kNone_GrShaderFlags;
+};
+
+const GrPrimitiveProcessor::TextureSampler& GrPrimitiveProcessor::IthTextureSampler(int i) {
+    SK_ABORT("Illegal texture sampler index");
+    static const TextureSampler kBogus;
+    return kBogus;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+/**
  * Returns the size of the attrib type in bytes.
  * This was moved from include/private/GrTypesPriv.h in service of Skia dependents that build
  * with C++11.