int VMobileForwardRenderLoop::GetLightInfluenceArea(VisLightSource_cl *pLight) { VASSERT(pLight != NULL); VisRenderContext_cl *pContext = VisRenderContext_cl::GetCurrentContext(); int iScreenWidth,iScreenHeight; pContext->GetSize(iScreenWidth, iScreenHeight); if (pLight->GetType() == VIS_LIGHT_DIRECTED) { // directional lights influence the whole screen return (iScreenWidth*iScreenHeight); } hkvMat4 projMatrix = pContext->GetViewProperties()->getProjectionMatrix(hkvClipSpaceYRange::MinusOneToOne); hkvMat4 viewMatrix = pContext->GetCamera()->GetWorldToCameraTransformation(); // get position/ radius of bounding sphere hkvVec3 vPosition; float fRadius = 0.0f; if (pLight->GetType() == VIS_LIGHT_POINT) { vPosition = pLight->GetPosition(); fRadius = pLight->GetRadius(); } else if (pLight->GetType() == VIS_LIGHT_SPOTLIGHT) { hkvAlignedBBox bBox; pLight->GetBoundingBox(bBox); vPosition = bBox.getBoundingSphere().m_vCenter; fRadius = bBox.getBoundingSphere().m_fRadius; } else VASSERT_MSG(false, "Unsupported light type"); // get corners of bounding rectangle in view space hkvVec4 vPositionVS = viewMatrix*vPosition.getAsVec4(1.0f); hkvVec4 vCorners[4]; vCorners[0] = vPositionVS+hkvVec4(-fRadius, -fRadius, 0.0f, 0.0f); vCorners[1] = vPositionVS+hkvVec4(fRadius, -fRadius, 0.0f, 0.0f); vCorners[2] = vPositionVS+hkvVec4(fRadius, fRadius, 0.0f, 0.0f); vCorners[3] = vPositionVS+hkvVec4(-fRadius, fRadius, 0.0f, 0.0f); // get corners of bounding rectangle in normalized device coordinates for (int i=0;i<4;i++) { vCorners[i] = projMatrix*vCorners[i]; vCorners[i] /= vCorners[i].w; } // clip corners of bounding rectangle hkvVec2 vMin(vCorners[0].x, vCorners[0].y); vMin.clampTo(hkvVec2(-1.0f, -1.0f), hkvVec2(1.0f, 1.0f)); hkvVec2 vMax(vCorners[2].x, vCorners[2].y); vMax.clampTo(hkvVec2(-1.0f, -1.0f), hkvVec2(1.0f, 1.0f)); // calculate influence area int iWidth = (int)((vMax.x-vMin.x)*0.5f*iScreenWidth); int iHeight = (int)((vMax.y-vMin.y)*0.5f*iScreenHeight); return (iWidth*iHeight); }
void VRendererNodeHelper::GetFrustumFarCorners(hkvVec3* pVectors) { VisRenderContext_cl *pContext = m_pRendererNode->GetReferenceContext(); hkvMat4 projMat = pContext->GetViewProperties()->getProjectionMatrix(hkvClipSpaceYRange::MinusOneToOne); projMat.invert (); // top left far corner pVectors[0].set(-1.0f,1.0f,1.0f); // bottom left far corner pVectors[1].set(-1.0f,-1.0f,1.0f); // bottom right far corner pVectors[2].set(1.0f,-1.0f,1.0f); // top right far corner pVectors[3].set(1.0f,1.0f,1.0f); for(int i=0;i<4;i++) { hkvVec4 vTransformed = projMat.transform (pVectors[i].getAsPosition()); pVectors[i] = vTransformed.getAsVec3 () / vTransformed.w; } }