Refugee from Dead Machine 4: MDB Monster

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 "GrBatchAtlas.h"
+#if 0
+#include "GrBufferAllocPool.h"
+#include "GrContext.h"
+#include "GrPendingProgramElement.h"
+#include "GrPipeline.h"
+#include "GrTRecorder.h"
+#include "GrVertices.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:
+    typedef GrBatchAtlas::BatchToken BatchToken;
+    GrBatchTarget(GrFoo* foo, GrGpu* gpu, GrRenderTarget* dst);
+
+    void initDraw(const GrPrimitiveProcessor* primProc, const GrPipeline* pipeline) {
+        GrNEW_APPEND_TO_RECORDER(fFlushBuffer, BufferedFlush, (primProc, pipeline));
+        fNumberOfDraws++;
+        fFoo1->inc();
+        //fCurrentToken1++;
+        //SkASSERT(fFoo->currentToken(fCurrentToken1));
+    }
+
+    class TextureUploader {
+    public:
+        TextureUploader(GrGpu* gpu) : fGpu(gpu) { SkASSERT(gpu); }
+
+        /**
+         * Updates the pixels in a rectangle of a texture.
+         *
+         * @param left          left edge of the rectangle to write (inclusive)
+         * @param top           top edge of the rectangle to write (inclusive)
+         * @param width         width of rectangle to write in pixels.
+         * @param height        height of rectangle to write in pixels.
+         * @param config        the pixel config of the source buffer
+         * @param buffer        memory to read pixels from
+         * @param rowBytes      number of bytes between consecutive rows. Zero
+         *                      means rows are tightly packed.
+         */
+        bool writeTexturePixels(GrTexture* texture,
+                                int left, int top, int width, int height,
+                                GrPixelConfig config, const void* buffer,
+                                size_t rowBytes) {
+            return fGpu->writePixels(texture, left, top, width, height, config, buffer, rowBytes);
+        }
+
+    private:
+        GrGpu* fGpu;
+    };
+
+    class Uploader : public SkRefCnt {
+    public:
+        Uploader(BatchToken lastUploadToken) : fLastUploadToken(lastUploadToken) {}
+        BatchToken lastUploadToken() const { return fLastUploadToken; }
+        virtual void upload(TextureUploader)=0;
+
+    private:
+        BatchToken fLastUploadToken;
+    };
+
+    void upload(Uploader* upload) {
+        if (this->asapToken() == upload->lastUploadToken()) {
+            fAsapUploads.push_back().reset(SkRef(upload));
+        } else {
+            fInlineUploads.push_back().reset(SkRef(upload));
+        }
+    }
+
+    void draw(const GrVertices& vertices) {
+        fFlushBuffer.back().fVertexDraws.push_back(vertices);
+    }
+
+    bool isIssued(BatchToken token) const { return fLastFlushedToken >= token; }
+    BatchToken currentToken1() const {
+        //SkASSERT(fCurrentToken1 == fFoo->currentToken(fCurrentToken1));
+        return fFoo1->currentToken();
+    }
+    BatchToken asapToken() const { return fLastFlushedToken + 1; }
+
+    // TODO much of this complexity goes away when batch is everywhere
+    void resetNumberOfDraws() { fNumberOfDraws = 0; }
+    int numberOfDraws() const { return fNumberOfDraws; }
+    void preFlush() {
+        this->unmapVertexAndIndexBuffers();
+        int updateCount = fAsapUploads.count();
+        for (int i = 0; i < updateCount; i++) {
+            fAsapUploads[i]->upload(TextureUploader(fGpu1));
+        }
+        fInlineUpdatesIndex = 0;
+        fIter = FlushBuffer::Iter(fFlushBuffer);
+    }
+    void flushNext(int n);
+    void postFlush() {
+        SkASSERT(!fIter.next());
+        fFlushBuffer.reset();
+        fAsapUploads.reset();
+        fInlineUploads.reset();
+    }
+
+    const GrCaps& caps() const { return *fGpu1->caps(); }
+
+    GrResourceProvider* resourceProvider() const { return fGpu1->getContext()->resourceProvider(); }
+
+    void* makeVertSpace(size_t vertexSize, int vertexCount,
+                        const GrVertexBuffer** buffer, int* startVertex);
+    uint16_t* makeIndexSpace(int indexCount,
+                             const GrIndexBuffer** buffer, int* startIndex);
+
+    // A helper for draws which overallocate and then return data to the pool
+    void putBackIndices(size_t indices) { fIndexPool.putBack(indices * sizeof(uint16_t)); }
+
+    void putBackVertices(size_t vertices, size_t vertexStride) {
+        fVertexPool.putBack(vertices * vertexStride);
+    }
+
+    void reset() {
+        fVertexPool.reset();
+        fIndexPool.reset();    
+    }
+
+private:
+    void unmapVertexAndIndexBuffers() {
+        fVertexPool.unmap();
+        fIndexPool.unmap();
+    }
+
+    GrGpu* fGpu1;
+    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) {}
+        typedef GrPendingProgramElement<const GrPrimitiveProcessor> ProgramPrimitiveProcessor;
+        ProgramPrimitiveProcessor fPrimitiveProcessor;
+        const GrPipeline* fPipeline;
+        GrBatchTracker fBatchTracker;
+        SkSTArray<1, GrVertices, true> fVertexDraws;
+    };
+
+    enum {
+        kFlushBufferInitialSizeInBytes = 8 * sizeof(BufferedFlush),
+    };
+
+    typedef GrTRecorder<BufferedFlush, TBufferAlign> FlushBuffer;
+
+    FlushBuffer fFlushBuffer;
+    // TODO this is temporary
+    FlushBuffer::Iter fIter;
+    int fNumberOfDraws;
+    public:
+    //BatchToken fCurrentToken1;
+    GrFoo* fFoo1;
+    GrRenderTarget* fRT;
+    BatchToken fLastFlushedToken; // The next token to be flushed
+    SkTArray<SkAutoTUnref<Uploader>, true> fAsapUploads;
+    SkTArray<SkAutoTUnref<Uploader>, true> fInlineUploads;
+    int fInlineUpdatesIndex;
+};
+
+#endif
+#endif