VertexDataManager.cpp

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Author : Jamie Madill
Date : 2014-02-04 16:04:13
Hash : a5d67475
Message : Remove VertexBuffer::requiresConversion. Since we now have Renderer methods to query formats for vertex inputs, we can get rid of the remaining calls to VertexBuffer which we used to query properties of vertex formats. Change-Id: I9e57d1d9bf80296aef271877fdd97a16d29114af Reviewed-on: https://chromium-review.googlesource.com/184522 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>
src/libGLESv2/renderer/VertexDataManager.cpp
#include "precompiled.h"
//
// Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// VertexDataManager.h: Defines the VertexDataManager, a class that
// runs the Buffer translation process.

#include "libGLESv2/renderer/VertexDataManager.h"
#include "libGLESv2/renderer/BufferStorage.h"

#include "libGLESv2/Buffer.h"
#include "libGLESv2/ProgramBinary.h"
#include "libGLESv2/VertexAttribute.h"
#include "libGLESv2/renderer/VertexBuffer.h"
#include "libGLESv2/renderer/Renderer.h"

namespace
{
    enum { INITIAL_STREAM_BUFFER_SIZE = 1024*1024 };
    // This has to be at least 4k or else it fails on ATI cards.
    enum { CONSTANT_VERTEX_BUFFER_SIZE = 4096 };
}

namespace rx
{

static int ElementsInBuffer(const gl::VertexAttribute &attribute, unsigned int size)
{
    // Size cannot be larger than a GLsizei
    if (size > static_cast<unsigned int>(std::numeric_limits<int>::max()))
    {
        size = static_cast<unsigned int>(std::numeric_limits<int>::max());
    }

    GLsizei stride = attribute.stride();
    return (size - attribute.mOffset % stride + (stride - attribute.typeSize())) / stride;
}

static int StreamingBufferElementCount(const gl::VertexAttribute &attribute, int vertexDrawCount, int instanceDrawCount)
{
    // For instanced rendering, we draw "instanceDrawCount" sets of "vertexDrawCount" vertices.
    //
    // A vertex attribute with a positive divisor loads one instanced vertex for every set of
    // non-instanced vertices, and the instanced vertex index advances once every "mDivisor" instances.
    if (instanceDrawCount > 0 && attribute.mDivisor > 0)
    {
        return instanceDrawCount / attribute.mDivisor;
    }

    return vertexDrawCount;
}

VertexDataManager::VertexDataManager(Renderer *renderer) : mRenderer(renderer)
{
    for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
    {
        mCurrentValue[i].FloatValues[0] = std::numeric_limits<float>::quiet_NaN();
        mCurrentValue[i].FloatValues[1] = std::numeric_limits<float>::quiet_NaN();
        mCurrentValue[i].FloatValues[2] = std::numeric_limits<float>::quiet_NaN();
        mCurrentValue[i].FloatValues[3] = std::numeric_limits<float>::quiet_NaN();
        mCurrentValue[i].Type = GL_FLOAT;
        mCurrentValueBuffer[i] = NULL;
        mCurrentValueOffsets[i] = 0;
    }

    mStreamingBuffer = new StreamingVertexBufferInterface(renderer, INITIAL_STREAM_BUFFER_SIZE);

    if (!mStreamingBuffer)
    {
        ERR("Failed to allocate the streaming vertex buffer.");
    }
}

VertexDataManager::~VertexDataManager()
{
    delete mStreamingBuffer;

    for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
    {
        delete mCurrentValueBuffer[i];
    }
}

GLenum VertexDataManager::prepareVertexData(const gl::VertexAttribute attribs[], const gl::VertexAttribCurrentValueData currentValues[],
                                            gl::ProgramBinary *programBinary, GLint start, GLsizei count, TranslatedAttribute *translated, GLsizei instances)
{
    if (!mStreamingBuffer)
    {
        return GL_OUT_OF_MEMORY;
    }

    for (int attributeIndex = 0; attributeIndex < gl::MAX_VERTEX_ATTRIBS; attributeIndex++)
    {
        translated[attributeIndex].active = (programBinary->getSemanticIndex(attributeIndex) != -1);
    }

    // Invalidate static buffers that don't contain matching attributes
    for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
    {
        if (translated[i].active && attribs[i].mArrayEnabled)
        {
            gl::Buffer *buffer = attribs[i].mBoundBuffer.get();
            StaticVertexBufferInterface *staticBuffer = buffer ? buffer->getStaticVertexBuffer() : NULL;

            if (staticBuffer && staticBuffer->getBufferSize() > 0 && !staticBuffer->lookupAttribute(attribs[i], NULL) &&
                !staticBuffer->directStoragePossible(attribs[i], currentValues[i]))
            {
                buffer->invalidateStaticData();
            }
        }
    }

    // Reserve the required space in the buffers
    for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
    {
        if (translated[i].active && attribs[i].mArrayEnabled)
        {
            gl::Buffer *buffer = attribs[i].mBoundBuffer.get();
            StaticVertexBufferInterface *staticBuffer = buffer ? buffer->getStaticVertexBuffer() : NULL;
            VertexBufferInterface *vertexBuffer = staticBuffer ? staticBuffer : static_cast<VertexBufferInterface*>(mStreamingBuffer);

            if (!vertexBuffer->directStoragePossible(attribs[i], currentValues[i]))
            {
                if (staticBuffer)
                {
                    if (staticBuffer->getBufferSize() == 0)
                    {
                        int totalCount = ElementsInBuffer(attribs[i], buffer->size());
                        if (!staticBuffer->reserveVertexSpace(attribs[i], totalCount, 0))
                        {
                            return GL_OUT_OF_MEMORY;
                        }
                    }
                }
                else
                {
                    int totalCount = StreamingBufferElementCount(attribs[i], count, instances);

                    // [OpenGL ES 3.0.2] section 2.9.4 page 40:
                    // We can return INVALID_OPERATION if our vertex attribute does not have enough backing data.
                    if (buffer && ElementsInBuffer(attribs[i], buffer->size()) < totalCount)
                    {
                        return GL_INVALID_OPERATION;
                    }

                    if (!mStreamingBuffer->reserveVertexSpace(attribs[i], totalCount, instances))
                    {
                        return GL_OUT_OF_MEMORY;
                    }
                }
            }
        }
    }

    // Perform the vertex data translations
    for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
    {
        if (translated[i].active)
        {
            if (attribs[i].mArrayEnabled)
            {
                gl::Buffer *buffer = attribs[i].mBoundBuffer.get();

                if (!buffer && attribs[i].mPointer == NULL)
                {
                    // This is an application error that would normally result in a crash, but we catch it and return an error
                    ERR("An enabled vertex array has no buffer and no pointer.");
                    return GL_INVALID_OPERATION;
                }

                StaticVertexBufferInterface *staticBuffer = buffer ? buffer->getStaticVertexBuffer() : NULL;
                VertexBufferInterface *vertexBuffer = staticBuffer ? staticBuffer : static_cast<VertexBufferInterface*>(mStreamingBuffer);

                BufferStorage *storage = buffer ? buffer->getStorage() : NULL;
                bool directStorage = vertexBuffer->directStoragePossible(attribs[i], currentValues[i]);

                unsigned int streamOffset = 0;
                unsigned int outputElementSize = 0;

                if (directStorage)
                {
                    outputElementSize = attribs[i].stride();
                    streamOffset = attribs[i].mOffset + outputElementSize * start;
                }
                else if (staticBuffer)
                {
                    if (!staticBuffer->getVertexBuffer()->getSpaceRequired(attribs[i], 1, 0, &outputElementSize))
                    {
                        return GL_OUT_OF_MEMORY;
                    }

                    if (!staticBuffer->lookupAttribute(attribs[i], &streamOffset))
                    {
                        // Convert the entire buffer
                        int totalCount = ElementsInBuffer(attribs[i], storage->getSize());
                        int startIndex = attribs[i].mOffset / attribs[i].stride();

                        if (!staticBuffer->storeVertexAttributes(attribs[i], currentValues[i], -startIndex, totalCount,
                                                                 0, &streamOffset))
                        {
                            return GL_OUT_OF_MEMORY;
                        }
                    }

                    unsigned int firstElementOffset = (attribs[i].mOffset / attribs[i].stride()) * outputElementSize;
                    unsigned int startOffset = (instances == 0 || attribs[i].mDivisor == 0) ? start * outputElementSize : 0;
                    if (streamOffset + firstElementOffset + startOffset < streamOffset)
                    {
                        return GL_OUT_OF_MEMORY;
                    }

                    streamOffset += firstElementOffset + startOffset;
                }
                else
                {
                    int totalCount = StreamingBufferElementCount(attribs[i], count, instances);
                    if (!mStreamingBuffer->getVertexBuffer()->getSpaceRequired(attribs[i], 1, 0, &outputElementSize) ||
                        !mStreamingBuffer->storeVertexAttributes(attribs[i], currentValues[i], start, totalCount, instances,
                                                                 &streamOffset))
                    {
                        return GL_OUT_OF_MEMORY;
                    }
                }

                translated[i].storage = directStorage ? storage : NULL;
                translated[i].vertexBuffer = vertexBuffer->getVertexBuffer();
                translated[i].serial = directStorage ? storage->getSerial() : vertexBuffer->getSerial();
                translated[i].divisor = attribs[i].mDivisor;

                translated[i].attribute = &attribs[i];
                translated[i].currentValueType = currentValues[i].Type;
                translated[i].stride = outputElementSize;
                translated[i].offset = streamOffset;
            }
            else
            {
                if (!mCurrentValueBuffer[i])
                {
                    mCurrentValueBuffer[i] = new StreamingVertexBufferInterface(mRenderer, CONSTANT_VERTEX_BUFFER_SIZE);
                }

                StreamingVertexBufferInterface *buffer = mCurrentValueBuffer[i];

                if (mCurrentValue[i] != currentValues[i])
                {
                    if (!buffer->reserveVertexSpace(attribs[i], 1, 0))
                    {
                        return GL_OUT_OF_MEMORY;
                    }

                    unsigned int streamOffset;
                    if (!buffer->storeVertexAttributes(attribs[i], currentValues[i], 0, 1, 0, &streamOffset))
                    {
                        return GL_OUT_OF_MEMORY;
                    }

                    mCurrentValue[i] = currentValues[i];
                    mCurrentValueOffsets[i] = streamOffset;
                }

                translated[i].storage = NULL;
                translated[i].vertexBuffer = mCurrentValueBuffer[i]->getVertexBuffer();
                translated[i].serial = mCurrentValueBuffer[i]->getSerial();
                translated[i].divisor = 0;

                translated[i].attribute = &attribs[i];
                translated[i].currentValueType = currentValues[i].Type;
                translated[i].stride = 0;
                translated[i].offset = mCurrentValueOffsets[i];
            }
        }
    }

    for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
    {
        if (translated[i].active && attribs[i].mArrayEnabled)
        {
            gl::Buffer *buffer = attribs[i].mBoundBuffer.get();

            if (buffer)
            {
                buffer->promoteStaticUsage(count * attribs[i].typeSize());
            }
        }
    }

    return GL_NO_ERROR;
}

}
kc3-lang/angle/src/libGLESv2/renderer/VertexDataManager.cpp

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kc3-lang/angle /src/libGLESv2/renderer/VertexDataManager.cpp
