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lfbBase.cpp
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lfbBase.cpp
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/* Copyright 2011 Pyarelal Knowles, under GNU LGPL (see LICENCE.txt) */
#include <stdio.h>
#include <string>
#include <map>
#include <vector>
#include <set>
#include <sstream>
#include "lfbBase.h"
#include <pyarlib/includegl.h>
#include <pyarlib/shader.h>
#include <pyarlib/shaderutil.h>
#include <pyarlib/util.h>
#include <pyarlib/gpu.h>
TextureBuffer* LFBBase::zeroes = NULL;
static Shader shaderZeroes("lfbZero");
//permutations of this shader use for different MAX_FRAGS values
static std::map<int, Shader*> sortingShaders;
EMBED(lfbZeroVert, shaders/lfbZero.vert);
EMBED(lfbGLSL, shaders/lfb.glsl);
EMBED(lfbSortVert, shaders/lfbSort.vert);
EMBED(sortingGLSL, shaders/sorting.glsl);
EMBED(lfbTilesGLSL, shaders/lfbTiles.glsl);
LFBBase::LFBBase() : size2D(0, 0)
{
//all LFBBase shaders are embedded. when the first LFBBase is created, the embedded data is given to the shader compiler
static bool loadEmbed = false;
if (!loadEmbed)
{
Shader::include("lfbZero.vert", RESOURCE(lfbZeroVert));
Shader::include("lfb.glsl", RESOURCE(lfbGLSL));
Shader::include("sorting.glsl", RESOURCE(sortingGLSL));
Shader::include("lfbSort.vert", RESOURCE(lfbSortVert));
Shader::include("lfbTiles.glsl", RESOURCE(lfbTilesGLSL));
loadEmbed = true;
}
maxFrags = 16;
totalPixels = 0;
totalFragments = 0;
allocFragments = 0;
state = PRE_INIT;
profile = NULL;
computeCounts = false;
bindless = false;
isDirty = false;
lastLFBDataStride = 0;
lfbDataType = GL_RG32F;
lfbDataStride = bytesPerPixel(lfbDataType);
pack = vec2i(1);
}
LFBBase::~LFBBase()
{
}
vec2i LFBBase::getSize()
{
return size2D;
}
bool LFBBase::resize(int size)
{
if (pack.y > 1)
printf("WARNING at %s:%i: a resize(int) has been called with a 2D pack\n", __FILE__, __LINE__);
return resize(vec2i(size, 1));
}
bool LFBBase::resize(vec2i dim)
{
dim = vec2i(ceil(dim.x, pack.x), ceil(dim.y, pack.y)) * pack;
if (size2D == dim)
return false;
size2D = dim;
totalPixels = size2D.x * size2D.y;
isDirty = true;
return true;
}
bool LFBBase::setPack(int i)
{
if (pack.x == i)
return false;
pack = vec2i(i, 1);
isDirty = true;
return true;
}
bool LFBBase::setPack(vec2i i)
{
if (pack == i)
return false;
pack = i;
isDirty = true;
return true;
}
vec2i LFBBase::getPack()
{
return pack;
}
//FIXME: using copy() used to be fast but I don't think it is anymore
void LFBBase::zeroBuffer(TextureBuffer* buffer, size_t size)
{
if (buffer->size() == 0)
return; //nothing to do
if (size <= 0)
size = buffer->size();
CHECKERROR;
if (!zeroes)
{
zeroes = new TextureBuffer(GL_R32UI);
}
if (size > zeroes->size())
{
zeroes->resize(size);
int currentProgram;
glGetIntegerv(GL_CURRENT_PROGRAM, ¤tProgram);
if (currentProgram != 0)
printf("Warning: program active before init zero buffer %s:%i\n", __FILE__, __LINE__);
//generate zero buffer
glEnable(GL_RASTERIZER_DISCARD);
shaderZeroes.use();
//zeroes->bind(0, "tozero", shaderZeroes, false, true);
shaderZeroes.set("tozero", *zeroes);
glDrawArrays(GL_POINTS, 0, (int)zeroes->size() / sizeof(unsigned int));
glMemoryBarrierEXT(GL_SHADER_IMAGE_ACCESS_BARRIER_BIT_EXT);
shaderZeroes.unuse();
glDisable(GL_RASTERIZER_DISCARD);
#if 0
//at one point I thought the above was failing
unsigned int* d = (unsigned int*)zeroes->map(true, true);
for (int i = 0; i < zeroes->size() / (int)sizeof(unsigned int); ++i)
{
//printf("%i %i\n", i, d[i]);
d[i] = 0;
}
zeroes->unmap();
#endif
}
memory["Zeroes"] = zeroes->size();
//FIXME: really could do multiple copies and allocate less zero data
CHECKERROR;
zeroes->copy(buffer, 0, 0, size);
CHECKERROR;
}
size_t LFBBase::getTotalPixels()
{
return totalPixels;
}
size_t LFBBase::getTotalFragments()
{
return totalFragments;
}
int LFBBase::getMaxFrags()
{
return maxFrags;
}
void LFBBase::setMaxFrags(int n)
{
maxFrags = mymax(2, n);
}
void LFBBase::setDefines(Shader& program)
{
program.define("_MAX_FRAGS", maxFrags);
program.define("LFB_FRAG_SIZE", lfbDataStride/sizeof(float));
program.define("LFB_BINDLESS", bindless);
//LFB_READONLY could also be defined here, however
//in case additional operations need to be performed, such
//as writing after sorting, LFB_READONLY is left for each shader to define itself
}
bool LFBBase::begin()
{
if (isDirty)
{
_resize(size2D);
isDirty = false;
printf("LFB Resized %ix%i (pack %ix%i, max %i, stride %i = vec%if)\n", size2D.x, size2D.y, pack.x, pack.y, maxFrags, lfbDataStride, lfbDataStride/4);
}
if (totalPixels == 0)
printf("Warning: rendering to empty LFBBase!\n");
state = FIRST_PASS;
return false; //is a full colour pass needed, or just depth complexity
}
bool LFBBase::count()
{
state = SECOND_PASS;
return false; //is a second pass needed? no by default
}
size_t LFBBase::end()
{
state = DRAWING;
return 0; //number of fragments rendered
}
void LFBBase::sort()
{
//a shader which simply calls loadFragments, sortFragments and writeFragments
Shader* sorter = NULL;
if (sortingShaders.find(maxFrags) == sortingShaders.end())
sortingShaders[maxFrags] = sorter = new Shader("lfbSort");
else
sorter = sortingShaders[maxFrags];
CHECKERROR;
setDefines(*sorter);
if (!sorter->use())
exit(0);
setUniforms(*sorter, "toSort");
glEnable(GL_RASTERIZER_DISCARD);
glDrawArrays(GL_POINTS, 0, (GLsizei)totalPixels);
glDisable(GL_RASTERIZER_DISCARD);
sorter->unuse();
CHECKERROR;
}
bool LFBBase::requireCounts(bool enable)
{
if (computeCounts == enable)
return false;
computeCounts = enable;
isDirty = true;
return true;
}
bool LFBBase::useBindlessGraphics(bool enable)
{
if (bindless == enable)
return false;
bindless = enable;
return true;
}
std::string LFBBase::getMemoryInfo()
{
std::stringstream ret;
size_t total = 0;
for (std::map<std::string, size_t>::iterator it = memory.begin(); it != memory.end(); ++it)
{
total += it->second;
ret << it->first << ": " << humanBytes(it->second, false) << std::endl;
}
ret << "Total" << ": " << humanBytes(total, false) << std::endl;
return ret.str();
}
int LFBBase::getFormat()
{
return lfbDataType;
}
bool LFBBase::setFormat(int f)
{
if (lfbDataType == f)
return false;
lfbDataType = f;
lfbDataStride = bytesPerPixel(lfbDataType);
isDirty = true;
return true;
}
size_t LFBBase::getMemoryUsage()
{
size_t total = 0;
std::map<std::string, size_t>::iterator it;
for (it = memory.begin(); it != memory.end(); ++it)
total += it->second;
return total;
}
bool LFBBase::getDepthHistogram(std::vector<unsigned int>& histogram)
{
return false;
}
bool LFBBase::save(std::string filename) const
{
printf("LFB::save() not implemented for this type\n");
return false;
}
bool LFBBase::load(std::string filename)
{
printf("LFB::load() not implemented for this type\n");
return false;
}