Consolidate GPU buffer implementations

src/gpu/GrGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpu_DEFINED
 #define GrGpu_DEFINED
 
 #include "GrPipelineBuilder.h"
 #include "GrProgramDesc.h"
 #include "GrStencil.h"
 #include "GrSwizzle.h"
 #include "GrAllocator.h"
 #include "GrTextureParamsAdjuster.h"
 #include "GrTypes.h"
 #include "GrXferProcessor.h"
 #include "SkPath.h"
 #include "SkTArray.h"
 
 class GrBatchTracker;
+class GrBuffer;
 class GrContext;
 class GrGLContext;
-class GrIndexBuffer;
 class GrMesh;
 class GrNonInstancedVertices;
 class GrPath;
 class GrPathRange;
 class GrPathRenderer;
 class GrPathRendererChain;
 class GrPathRendering;
 class GrPipeline;
 class GrPrimitiveProcessor;
 class GrRenderTarget;
 class GrStencilAttachment;
 class GrSurface;
 class GrTexture;
-class GrTransferBuffer;
-class GrVertexBuffer;
 
 class GrGpu : public SkRefCnt {
 public:
     /**
      * Create an instance of GrGpu that matches the specified backend. If the requested backend is
      * not supported (at compile-time or run-time) this returns nullptr. The context will not be
      * fully constructed and should not be used by GrGpu until after this function returns.
      */
     static GrGpu* Create(GrBackend, GrBackendContext, const GrContextOptions&, GrContext* context);
 
@@ skipping 71 matching lines @@
      * Implements GrTextureProvider::wrapBackendRenderTarget
      */
     GrRenderTarget* wrapBackendRenderTarget(const GrBackendRenderTargetDesc&, GrWrapOwnership);
 
     /**
      * Implements GrTextureProvider::wrapBackendTextureAsRenderTarget
      */
     GrRenderTarget* wrapBackendTextureAsRenderTarget(const GrBackendTextureDesc&, GrWrapOwnership);
 
     /**
-     * Creates a vertex buffer.
+     * Creates a buffer.
      *
-     * @param size    size in bytes of the vertex buffer
-     * @param dynamic hints whether the data will be frequently changed
-     *                by either GrVertexBuffer::map() or
-     *                GrVertexBuffer::updateData().
-     *
-     * @return    The vertex buffer if successful, otherwise nullptr.
+     * @return the buffer if successful, otherwise nullptr.
      */
-    GrVertexBuffer* createVertexBuffer(size_t size, bool dynamic);
-
-    /**
-     * Creates an index buffer.
-     *
-     * @param size    size in bytes of the index buffer
-     * @param dynamic hints whether the data will be frequently changed
-     *                by either GrIndexBuffer::map() or
-     *                GrIndexBuffer::updateData().
-     *
-     * @return The index buffer if successful, otherwise nullptr.
-     */
-    GrIndexBuffer* createIndexBuffer(size_t size, bool dynamic);
-
-    /**
-     * Creates a transfer buffer.
-     *
-     * @param size      size in bytes of the index buffer
-     * @param toGpu     true if used to transfer from the cpu to the gpu
-     *                  otherwise to be used to transfer from the gpu to the cpu
-     *
-     * @return The transfer buffer if successful, otherwise nullptr.
-     */
-    GrTransferBuffer* createTransferBuffer(size_t size, TransferType type);
+    GrBuffer* createBuffer(GrBufferType, size_t size, GrAccessPattern);
     
     /**
      * Resolves MSAA.
      */
     void resolveRenderTarget(GrRenderTarget* target);
 
     /** Info struct returned by getReadPixelsInfo about performing intermediate draws before
         reading pixels for performance or correctness. */
     struct ReadPixelTempDrawInfo {
         /** If the GrGpu is requesting that the caller do a draw to an intermediate surface then
@@ skipping 116 matching lines @@
      * @param buffer   memory to read pixels from.
      * @param rowBytes number of bytes between consecutive rows. Zero
      *                 means rows are tightly packed.
      */
     bool writePixels(GrSurface* surface,
                      int left, int top, int width, int height,
                      GrPixelConfig config, const void* buffer,
                      size_t rowBytes);
 
     /**
-     * Updates the pixels in a rectangle of a surface using a GrTransferBuffer
+     * Updates the pixels in a rectangle of a surface using a buffer
      *
-     * @param surface       The surface to write to.
-     * @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        GrTransferBuffer to read pixels from
-     * @param offset        offset from the start of the buffer
-     * @param rowBytes      number of bytes between consecutive rows. Zero
-     *                      means rows are tightly packed.
+     * @param surface          The surface to write to.
+     * @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 transferBuffer   GrBuffer to read pixels from (type must be "kCpuToGpu")
+     * @param offset           offset from the start of the buffer
+     * @param rowBytes         number of bytes between consecutive rows. Zero
+     *                         means rows are tightly packed.
      */
     bool transferPixels(GrSurface* surface,
                         int left, int top, int width, int height,
-                        GrPixelConfig config, GrTransferBuffer* buffer,
+                        GrPixelConfig config, GrBuffer* transferBuffer,
                         size_t offset, size_t rowBytes);
 
     /**
      * Clear the passed in render target. Ignores the draw state and clip.
      */
     void clear(const SkIRect& rect, GrColor color, GrRenderTarget* renderTarget);
 
 
     void clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* renderTarget);
 
@@ skipping 218 matching lines @@
                                        const SkTArray<GrMipLevel>& texels) = 0;
     virtual GrTexture* onCreateCompressedTexture(const GrSurfaceDesc& desc,
                                                  GrGpuResource::LifeCycle lifeCycle,
                                                  const SkTArray<GrMipLevel>& texels) = 0;
 
     virtual GrTexture* onWrapBackendTexture(const GrBackendTextureDesc&, GrWrapOwnership) = 0;
     virtual GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&,
                                                       GrWrapOwnership) = 0;
     virtual GrRenderTarget* onWrapBackendTextureAsRenderTarget(const GrBackendTextureDesc&,
                                                                GrWrapOwnership) = 0;
-    virtual GrVertexBuffer* onCreateVertexBuffer(size_t size, bool dynamic) = 0;
-    virtual GrIndexBuffer* onCreateIndexBuffer(size_t size, bool dynamic) = 0;
-    virtual GrTransferBuffer* onCreateTransferBuffer(size_t size, TransferType type) = 0;
+    virtual GrBuffer* onCreateBuffer(GrBufferType, size_t size, GrAccessPattern) = 0;
 
     // overridden by backend-specific derived class to perform the clear.
     virtual void onClear(GrRenderTarget*, const SkIRect& rect, GrColor color) = 0;
 
     // Overridden by backend specific classes to perform a clear of the stencil clip bits.  This is
     // ONLY used by the the clip target
     virtual void onClearStencilClip(GrRenderTarget*, const SkIRect& rect, bool insideClip) = 0;
 
     // overridden by backend-specific derived class to perform the draw call.
     virtual void onDraw(const GrPipeline&,
@@ skipping 21 matching lines @@
 
     // overridden by backend-specific derived class to perform the surface write
     virtual bool onWritePixels(GrSurface*,
                                int left, int top, int width, int height,
                                GrPixelConfig config,
                                const SkTArray<GrMipLevel>& texels) = 0;
 
     // overridden by backend-specific derived class to perform the surface write
     virtual bool onTransferPixels(GrSurface*,
                                   int left, int top, int width, int height,
-                                  GrPixelConfig config, GrTransferBuffer* buffer,
+                                  GrPixelConfig config, GrBuffer* transferBuffer,
                                   size_t offset, size_t rowBytes) = 0;
 
     // overridden by backend-specific derived class to perform the resolve
     virtual void onResolveRenderTarget(GrRenderTarget* target) = 0;
 
     // overridden by backend specific derived class to perform the copy surface
     virtual bool onCopySurface(GrSurface* dst,
                                GrSurface* src,
                                const SkIRect& srcRect,
                                const SkIPoint& dstPoint) = 0;
@@ skipping 15 matching lines @@
     SkTArray<const MultisampleSpecs*, true>                             fMultisampleSpecsMap;
     GrTAllocator<MultisampleSpecs>                                      fMultisampleSpecsAllocator;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu.
     GrContext*                                                          fContext;
 
     friend class GrPathRendering;
     typedef SkRefCnt INHERITED;
 };
 
 #endif