OpenSpace/modules/globebrowsing/other/pixelbuffer.cpp

/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2017                                                               *
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#include <modules/globebrowsing/other/pixelbuffer.h>
#include <ghoul/logging/logmanager.h>

namespace {
    const char* _loggerCat = "PixelBuffer";
};

using namespace openspace::globebrowsing;

PixelBuffer::PixelBuffer(size_t numBytes, Usage usage)
    : _numBytes(numBytes)
    , _usage(usage)
    , _isMapped(false)
{
    glGenBuffers(1, &_id);
    bind();
    glBufferData(GL_PIXEL_UNPACK_BUFFER, _numBytes, 0, static_cast<GLenum>(_usage));
    unbind();
}

PixelBuffer::~PixelBuffer() {
    glDeleteBuffers(1, &_id);
}

void* PixelBuffer::mapBuffer(Access access) {
    void* dataPtr = glMapBuffer(GL_PIXEL_UNPACK_BUFFER, static_cast<GLenum>(access));
    _isMapped = dataPtr ? true : false;
    return dataPtr;
}

void* PixelBuffer::mapBufferRange(GLintptr offset, GLsizeiptr length, BufferAccessMask access) {
    void* dataPtr = glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, length, access);
    _isMapped = dataPtr ? true : false;
    return dataPtr;
}

bool PixelBuffer::unMapBuffer() {
    GLboolean success = glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
    if (!success) {
        LERROR("Unable to unmap pixel buffer, data may be corrupt!");
    }
    _isMapped = false;
    return success == GL_TRUE;
}

void PixelBuffer::bind() {
    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, _id);
}

void PixelBuffer::unbind() {
    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
}

bool PixelBuffer::isMapped() const {
    return _isMapped;
}

PixelBuffer::operator GLuint() const {
    return _id;
}