GrBatchPrototype

src/gpu/GrBatchTarget.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"
+
+/*
+ * GrBatch instances use this object to allocate space for their geometry and to issue the draws
+ * that render their batch.
+ */
+
+class GrBatchTarget : public SkNoncopyable {
+public:
+    GrBatchTarget(GrGpu* gpu,
+                  GrVertexBufferAllocPool* vpool,
+                  GrIndexBufferAllocPool* ipool)
+        : fGpu(gpu)
+        , fVertexPool(vpool)
+        , fIndexPool(ipool)
+        , fFlushBuffer(kFlushBufferInitialSizeInBytes)
+        , fIter(fFlushBuffer) {}
+
+    typedef GrDrawTarget::DrawInfo DrawInfo;
+    void initDraw(const GrPrimitiveProcessor* primProc, const GrPipeline* pipeline) {
+        GrNEW_APPEND_TO_RECORDER(fFlushBuffer, BufferedFlush, (primProc, pipeline));
+    }
+
+    void draw(const GrDrawTarget::DrawInfo& draw) {
+        fFlushBuffer.back().fDraws.push_back(draw);
+    }
+
+    // TODO this is temporary until batch is everywhere
+    //void flush();
+    void preFlush() { fIter = FlushBuffer::Iter(fFlushBuffer); }
+    void flushNext();
+    void postFlush() { SkASSERT(!fIter.next()); fFlushBuffer.reset(); }
+
+    // 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.
+
+    struct BufferedFlush {
+        BufferedFlush(const GrPrimitiveProcessor* primProc, const GrPipeline* pipeline)
+            : fPrimitiveProcessor(primProc)
+            , fPipeline(pipeline)
+            , fDraws(kDrawRecorderInitialSizeInBytes) {}
+        typedef GrPendingProgramElement<const GrPrimitiveProcessor> ProgramPrimitiveProcessor;
+        ProgramPrimitiveProcessor fPrimitiveProcessor;
+        const GrPipeline* fPipeline;
+        GrBatchTracker fBatchTracker;
+        SkSTArray<4, DrawInfo, true> fDraws;
+    };
+
+    enum {
+        kFlushBufferInitialSizeInBytes = 8 * sizeof(BufferedFlush),
+        kDrawRecorderInitialSizeInBytes = 8 * sizeof(DrawInfo),
+    };
+
+    typedef GrTRecorder<BufferedFlush, TBufferAlign> FlushBuffer;
+
+    FlushBuffer fFlushBuffer;
+    // TODO this is temporary
+    FlushBuffer::Iter fIter;
+};
+
+#endif