GrBatchPrototype

src/gpu/GrBatchBuffer.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrBatchBuffer_DEFINED
+#define GrBatchBuffer_DEFINED
+
+#include "GrPendingProgramElement.h"
+#include "GrGpu.h"
+#include "GrTRecorder.h"
+
+/*
+ * GrBatchBuffer is a simple class which lets GrDrawTarget subclasses defer flushing of batched
+ * Geometry for performance reasons.
+ */
+
+class GrBatchBuffer : public SkNoncopyable {
+public:
+    GrBatchBuffer(GrGpu* gpu,
+                  GrVertexBufferAllocPool* vpool,
+                  GrIndexBufferAllocPool* ipool)
+        : fGpu(gpu)
+        , fVertexPool(vpool)
+        , fIndexPool(ipool)
+        , fFlushBuffer(kFlushBufferInitialSizeInBytes) {}
+
+    typedef GrDrawTarget::DrawInfo DrawInfo;
+    void initDraw(const GrPrimitiveProcessor*, const GrOptDrawState*);
+    void draw(const GrDrawTarget::DrawInfo&);
+    void flush();
+
+    // TODO This goes away when everything uses batch
+    GrBatchTracker* currentBatchTracker() {
+        SkASSERT(!fFlushBuffer.empty());
+        return &fFlushBuffer.back().fBatchTracker;
+    }
+
+    GrVertexBufferAllocPool* vertexPool() { return fVertexPool; }
+    GrIndexBufferAllocPool* indexPool() { return fIndexPool; }
+
+private:
+    GrGpu* fGpu;
+    GrVertexBufferAllocPool* fVertexPool;
+    GrIndexBufferAllocPool* fIndexPool;
+
+    typedef void* TBufferAlign; // This wouldn't be enough align if a command used long double.
+    typedef GrTRecorder<GrDrawTarget::DrawInfo, TBufferAlign> DrawRecorder;
+
+    struct BufferedFlush {
+        BufferedFlush(const GrPrimitiveProcessor* primProc, const GrOptDrawState* optState)
+            : fPrimitiveProcessor(primProc)
+            , fOptState(optState)
+            , fDraws(kDrawRecorderInitialSizeInBytes) {}
+        typedef GrPendingProgramElement<const GrPrimitiveProcessor> ProgramPrimitiveProcessor;
+        ProgramPrimitiveProcessor fPrimitiveProcessor;
+        const GrOptDrawState* fOptState;
+        GrBatchTracker fBatchTracker;
+        DrawRecorder fDraws;
+    };
+
+    enum {
+        kFlushBufferInitialSizeInBytes = 8 * sizeof(BufferedFlush),
+        kDrawRecorderInitialSizeInBytes = 8 * sizeof(DrawInfo),
+    };
+
+    typedef GrTRecorder<BufferedFlush, TBufferAlign> FlushBuffer;
+
+    FlushBuffer fFlushBuffer;
+};
+
+#endif