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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: 5.0.1 (2010/09/08)
#include "CubeMapEffect.h"
#include "Wm5CameraWorldPositionConstant.h"
#include "Wm5PVWMatrixConstant.h"
#include "Wm5ScreenTarget.h"
#include "Wm5TextureCube.h"
#include "Wm5Utility.h"
#include "Wm5WMatrixConstant.h"
using namespace Wm5;
WM5_IMPLEMENT_RTTI(Wm5, VisualEffect, CubeMapEffect);
WM5_IMPLEMENT_STREAM(CubeMapEffect);
WM5_IMPLEMENT_FACTORY(CubeMapEffect);
WM5_IMPLEMENT_DEFAULT_NAMES(VisualEffect, CubeMapEffect);
WM5_IMPLEMENT_DEFAULT_STREAM(VisualEffect, CubeMapEffect);
CubeMapEffect::UpdateMap* CubeMapEffect::msUpdates = 0;
//----------------------------------------------------------------------------
CubeMapEffect::CubeMapEffect (const std::string& effectFile)
:
VisualEffect(effectFile)
{
// TODO: Once WmfxCompiler parses the Cg FX files, we will not need to
// set the sampler state.
PixelShader* pshader = GetPixelShader(0, 0);
// CubeMapSampler
pshader->SetFilter(0, Shader::SF_LINEAR_LINEAR);
pshader->SetCoordinate(0, 0, Shader::SC_CLAMP_EDGE);
pshader->SetCoordinate(0, 1, Shader::SC_CLAMP_EDGE);
}
//----------------------------------------------------------------------------
CubeMapEffect::~CubeMapEffect ()
{
}
//----------------------------------------------------------------------------
VisualEffectInstance* CubeMapEffect::CreateInstance (TextureCube* texture,
ShaderFloat* reflectivity, bool allowDynamicUpdates)
{
VisualEffectInstance* instance = new0 VisualEffectInstance(this, 0);
instance->SetVertexConstant(0, 0, new0 PVWMatrixConstant());
instance->SetVertexConstant(0, 1, new0 WMatrixConstant());
instance->SetVertexConstant(0, 2, new0 CameraWorldPositionConstant());
instance->SetPixelConstant(0, 0, reflectivity);
instance->SetPixelTexture(0, 0, texture);
if (allowDynamicUpdates)
{
DynamicUpdate update;
update.DUCamera = new0 Camera();
VertexFormat* vformat = VertexFormat::Create(2,
VertexFormat::AU_POSITION, VertexFormat::AT_FLOAT3, 0,
VertexFormat::AU_TEXCOORD, VertexFormat::AT_FLOAT2, 0);
int rtSize = texture->GetWidth();
update.DUSquare = ScreenTarget::CreateRectangle(vformat, rtSize,
rtSize, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f);
update.DUTarget = new0 RenderTarget(1, texture->GetFormat(), rtSize,
rtSize, false, true);
if (!msUpdates)
{
msUpdates = new0 UpdateMap();
}
msUpdates->insert(std::make_pair(instance, update));
}
return instance;
}
//----------------------------------------------------------------------------
void CubeMapEffect::DestroyUpdateMap ()
{
delete0(msUpdates);
}
//----------------------------------------------------------------------------
bool CubeMapEffect::AllowDynamicUpdates (VisualEffectInstance* instance)
{
if (msUpdates)
{
return msUpdates->find(instance) != msUpdates->end();
}
return false;
}
//----------------------------------------------------------------------------
void CubeMapEffect::UpdateFaces (VisualEffectInstance* instance,
Renderer* renderer, Spatial* scene, const APoint& envOrigin,
const AVector& envDVector, const AVector& envUVector,
const AVector& envRVector)
{
// TODO. Implement cube-map render targets to avoid the expensive copies
// of render target textures to the cube texture.
if (!msUpdates)
{
// No update instances exist.
return;
}
UpdateMap::iterator iter = msUpdates->find(instance);
if (iter == msUpdates->end())
{
// Dynamic updates were not enabled in the CreateInstance call.
return;
}
DynamicUpdate& update = iter->second;
TextureCube* cubeTexture = (TextureCube*)instance->GetPixelTexture(0, 0);
AVector dVector[6] =
{
-envRVector,
envRVector,
envUVector,
-envUVector,
envDVector,
-envDVector
};
AVector uVector[6] =
{
envUVector,
envUVector,
-envDVector,
envDVector,
envUVector,
envUVector
};
AVector rVector[6] =
{
envDVector,
-envDVector,
envRVector,
envRVector,
envRVector,
-envRVector
};
// The camera is oriented six times along the coordinate axes and using
// a frustum with a 90-degree field of view and an aspect ratio of 1 (the
// cube faces are squares). Save the current camera for restoration at
// the end of this function.
CameraPtr camera = renderer->GetCamera();
update.DUCamera->SetFrustum(90.0f, 1.0f, camera->GetDMin(),
camera->GetDMax());
update.DUCuller.SetCamera(update.DUCamera);
renderer->SetCamera(update.DUCamera);
int faceSize = cubeTexture->GetWidth();
int pixelSize = cubeTexture->GetPixelSize();
Texture2D* texture = 0;
for (int face = 0; face < 6; ++face)
{
update.DUCamera->SetFrame(envOrigin, dVector[face], uVector[face],
rVector[face]);
update.DUCuller.ComputeVisibleSet(scene);
renderer->Enable(update.DUTarget);
renderer->ClearBuffers();
renderer->Draw(update.DUCuller.GetVisibleSet());
renderer->Disable(update.DUTarget);
renderer->ReadColor(0, update.DUTarget, texture);
char* cubeData = cubeTexture->GetData(face, 0);
char* textData = texture->GetData(0);
int numBytes = texture->GetNumLevelBytes(0);
Utility::ReflectX(faceSize, faceSize, pixelSize, textData);
if (VertexShader::GetProfile() == VertexShader::VP_ARBVP1)
{
Utility::ReflectY(faceSize, faceSize, pixelSize, textData);
}
memcpy(cubeData, textData, numBytes);
}
delete0(texture);
// Request a refresh of VRAM with the new cube map.
renderer->Update(cubeTexture, 0, 0);
renderer->Update(cubeTexture, 1, 0);
renderer->Update(cubeTexture, 2, 0);
renderer->Update(cubeTexture, 3, 0);
renderer->Update(cubeTexture, 4, 0);
renderer->Update(cubeTexture, 5, 0);
cubeTexture->GenerateMipmaps();
// Restore the original camera and propagate the information to the
// renderer.
renderer->SetCamera(camera);
}
//----------------------------------------------------------------------------
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