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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.2.1 (2010/09/08)
#include "GpuRootFinder.h"
WM5_WINDOW_APPLICATION(GpuRootFinder);
//----------------------------------------------------------------------------
GpuRootFinder::GpuRootFinder ()
:
WindowApplication3("SampleMathematics/GpuRootFinder", 0, 0, 64, 64,
Float4(0.5f, 0.5f, 0.5f, 1.0f)),
mTextColor(0.0f, 0.0f, 0.0f, 1.0f)
{
Environment::InsertDirectory(ThePath + "Shaders/");
mResults = 0;
}
//----------------------------------------------------------------------------
bool GpuRootFinder::OnInitialize ()
{
if (!WindowApplication3::OnInitialize())
{
return false;
}
// Create a screen-space camera to use with the render target.
mScreenCamera = ScreenTarget::CreateCamera();
mRenderer->SetCamera(mScreenCamera);
// Create a screen polygon to use with the render target.
VertexFormat* vformat = VertexFormat::Create(2,
VertexFormat::AU_POSITION, VertexFormat::AT_FLOAT3, 0,
VertexFormat::AU_TEXCOORD, VertexFormat::AT_FLOAT2, 0);
mScreenPolygon = ScreenTarget::CreateRectangle(vformat, 4096, 2048,
0.0f, 1.0f, 0.0f, 1.0f, 0.0f);
// Create the render targets.
Texture::Format tformat = Texture::TF_A8R8G8B8;
mRenderTarget = new0 RenderTarget(1, tformat, 4096, 2048, false, false);
// Create the results texture.
mResults = new0 Texture2D(Texture::TF_A8R8G8B8, 4096, 2048, 1);
// Create the root-finder effect.
RootFinderEffect* effect = new0 RootFinderEffect();
mScreenPolygon->SetEffectInstance(effect->CreateInstance());
// Compute the roots.
if (mRenderer->PreDraw())
{
int64_t start = GetTimeInMicroseconds();
mRenderer->Enable(mRenderTarget);
mRenderer->Draw(mScreenPolygon);
mRenderer->Disable(mRenderTarget);
mRenderer->ReadColor(0, mRenderTarget, mResults);
unsigned char* data = (unsigned char*)mResults->GetData(0);
const int jmax = 4096*2048;
for (int j = 0; j < jmax; ++j, data += 4)
{
int negMin = data[0];
int posMax = data[1];
int posMin = data[2];
int negMax = data[3];
int e, unbiased;
float unit0, unit1, x0, x1, y0, y1;
if (posMin <= posMax)
{
for (e = posMin; e <= posMax; ++e)
{
unbiased = e - 127;
unit0 = 1.0f + ldexp((float)j, -23);
unit1 = 1.0f + ldexp((float)(j+1), -23);
x0 = ldexp(unit0, unbiased);
x1 = ldexp(unit1, unbiased);
y0 = MyFunction(x0);
y1 = MyFunction(x1);
assertion(y0*y1 <= 0.0f, "Unexpected condition.\n");
mRoots.insert(fabs(y0) <= fabs(y1) ? x0 : x1);
}
}
if (negMin <= negMax)
{
for (e = negMin; e <= negMax; ++e)
{
unbiased = e - 127;
unit0 = 1.0f + ldexp((float)j, -23);
unit1 = 1.0f + ldexp((float)(j+1), -23);
x0 = -ldexp(unit0, unbiased);
x1 = -ldexp(unit1, unbiased);
y0 = MyFunction(x0);
y1 = MyFunction(x1);
assertion(y0*y1 <= 0.0f, "Unexpected condition.\n");
mRoots.insert(fabs(y0) <= fabs(y1) ? x0 : x1);
}
}
}
int64_t final = GetTimeInMicroseconds();
FILE* output = fopen("results.txt", "wt");
fprintf(output, "microseconds = %d\n", (int)(final-start));
std::set<float>::iterator iter = mRoots.begin();
std::set<float>::iterator end = mRoots.end();
for (/**/; iter != end; ++iter)
{
fprintf(output, "root = %f\n", *iter);
}
fclose(output);
mRenderer->PostDraw();
}
// Do not launch the application window.
return false;
}
//----------------------------------------------------------------------------
void GpuRootFinder::OnTerminate ()
{
mScreenCamera = 0;
mRenderTarget = 0;
mScreenPolygon = 0;
delete0(mResults);
WindowApplication3::OnTerminate();
}
//----------------------------------------------------------------------------
float GpuRootFinder::MyFunction (float x)
{
return (x - 1.1f)*(x + 2.2f);
}
//----------------------------------------------------------------------------
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