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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: 5.0.0 (2010/01/01)
#include "Wm5GraphicsPCH.h"
#include "Wm5ScreenTarget.h"
using namespace Wm5;
//----------------------------------------------------------------------------
Camera* ScreenTarget::CreateCamera ()
{
// The screen camera maps (x,y,z) in [0,1]^3 to (x',y,'z') in
// [-1,1]^2 x [0,1].
Camera* camera = new0 Camera(false);
camera->SetFrustum(0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f);
camera->SetFrame(APoint::ORIGIN, AVector::UNIT_Z, AVector::UNIT_Y,
AVector::UNIT_X);
return camera;
}
//----------------------------------------------------------------------------
TriMesh* ScreenTarget::CreateRectangle (VertexFormat* vformat, int rtWidth,
int rtHeight, float xmin, float xmax, float ymin, float ymax,
float zValue)
{
if (ValidFormat(vformat) && ValidSizes(rtWidth, rtHeight))
{
Float2 tc0, tc1, tc2, tc3;
if (VertexShader::GetProfile() == VertexShader::VP_ARBVP1)
{
tc0 = Float2(0.0f, 0.0f);
tc1 = Float2(1.0f, 0.0f);
tc2 = Float2(1.0f, 1.0f);
tc3 = Float2(0.0f, 1.0f);
}
else
{
float dx = 0.5f*(xmax - xmin)/(float)(rtWidth - 1);
float dy = 0.5f*(ymax - ymin)/(float)(rtHeight - 1);
xmin -= dx;
xmax -= dx;
ymin += dy;
ymax += dy;
tc0 = Float2(0.0f, 1.0f);
tc1 = Float2(1.0f, 1.0f);
tc2 = Float2(1.0f, 0.0f);
tc3 = Float2(0.0f, 0.0f);
}
int vstride = vformat->GetStride();
VertexBuffer* vbuffer = new0 VertexBuffer(4, vstride);
VertexBufferAccessor vba(vformat, vbuffer);
vba.Position<Float3>(0) = Float3(xmin, ymin, zValue);
vba.Position<Float3>(1) = Float3(xmax, ymin, zValue);
vba.Position<Float3>(2) = Float3(xmax, ymax, zValue);
vba.Position<Float3>(3) = Float3(xmin, ymax, zValue);
vba.TCoord<Float2>(0, 0) = tc0;
vba.TCoord<Float2>(0, 1) = tc1;
vba.TCoord<Float2>(0, 2) = tc2;
vba.TCoord<Float2>(0, 3) = tc3;
// Create the index buffer for the square.
IndexBuffer* ibuffer = new0 IndexBuffer(6, sizeof(int));
int* indices = (int*)ibuffer->GetData();
indices[0] = 0; indices[1] = 1; indices[2] = 2;
indices[3] = 0; indices[4] = 2; indices[5] = 3;
return new0 TriMesh(vformat, vbuffer, ibuffer);
}
return 0;
}
//----------------------------------------------------------------------------
bool ScreenTarget::CreatePositions (int rtWidth, int rtHeight, float xmin,
float xmax, float ymin, float ymax, float zValue, Float3* positions)
{
if (ValidSizes(rtWidth, rtHeight))
{
if (VertexShader::GetProfile() == VertexShader::VP_ARBVP1)
{
xmin = 0.0f;
xmax = 1.0f;
ymin = 0.0f;
ymax = 1.0f;
}
else
{
float dx = 0.5f*(xmax - xmin)/(float)(rtWidth - 1);
float dy = 0.5f*(ymax - ymin)/(float)(rtHeight - 1);
xmin -= dx;
xmax -= dx;
ymin += dy;
ymax += dy;
}
positions[0] = Float3(xmin, ymin, zValue);
positions[1] = Float3(xmax, ymin, zValue);
positions[2] = Float3(xmax, ymax, zValue);
positions[3] = Float3(xmin, ymax, zValue);
return true;
}
return false;
}
//----------------------------------------------------------------------------
void ScreenTarget::CreateTCoords (Float2* tcoords)
{
if (VertexShader::GetProfile() == VertexShader::VP_ARBVP1)
{
tcoords[0] = Float2(0.0f, 0.0f);
tcoords[1] = Float2(1.0f, 0.0f);
tcoords[2] = Float2(1.0f, 1.0f);
tcoords[3] = Float2(0.0f, 1.0f);
}
else
{
tcoords[0] = Float2(0.0f, 1.0f);
tcoords[1] = Float2(1.0f, 1.0f);
tcoords[2] = Float2(1.0f, 0.0f);
tcoords[3] = Float2(0.0f, 0.0f);
}
}
//----------------------------------------------------------------------------
bool ScreenTarget::ValidSizes (int rtWidth, int rtHeight)
{
if (rtWidth > 0 && rtHeight > 0)
{
return true;
}
assertion(false, "Invalid dimensions.\n");
return false;
}
//----------------------------------------------------------------------------
bool ScreenTarget::ValidFormat (VertexFormat* vformat)
{
int index = vformat->GetIndex(VertexFormat::AU_POSITION, 0);
if (index < 0)
{
assertion(false, "Format must have positions.\n");
return false;
}
if (vformat->GetAttributeType(index) != VertexFormat::AT_FLOAT3)
{
assertion(false, "Positions must be 3-tuples.\n");
return false;
}
index = vformat->GetIndex(VertexFormat::AU_TEXCOORD, 0);
if (index < 0)
{
assertion(false, "Format must have texture coordinates in unit 0.\n");
return false;
}
if (vformat->GetAttributeType(index) != VertexFormat::AT_FLOAT2)
{
assertion(false, "Texture coordinates in unit 0 must be 2-tuples.\n");
return false;
}
return true;
}
//----------------------------------------------------------------------------
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