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Implement InverseTransform()

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This commit is contained in:
Anders Jenbo 2025-06-04 04:48:30 +02:00
parent d57f1bd784
commit 771801d826
2 changed files with 48 additions and 2 deletions
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49
miniwin/src/d3drm/d3drmviewport.cpp
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@ -446,10 +446,17 @@ void Direct3DRMViewportImpl::UpdateProjectionMatrix()
{0, 0, m_back / depth, 1},
{0, 0, (-m_front * m_back) / depth, 0},
};
memcpy(m_projectionMatrix, projection, sizeof(D3DRMMATRIX4D));
m_renderer->SetProjection(projection, m_front, m_back);
D3DRMMATRIX4D inverseProjectionMatrix = {
{1.0f / f, 0, 0, 0},
{0, 1.0f / (f * aspect), 0, 0},
{0, 0, 0, depth / (-m_front * m_back)},
{0, 0, 1, -(m_back / depth) * depth / (-m_front * m_back)},
};
memcpy(m_inverseProjectionMatrix, inverseProjectionMatrix, sizeof(D3DRMMATRIX4D));
}
D3DVALUE Direct3DRMViewportImpl::GetField()
@ -506,7 +513,45 @@ HRESULT Direct3DRMViewportImpl::Transform(D3DRMVECTOR4D* screen, D3DVECTOR* worl
HRESULT Direct3DRMViewportImpl::InverseTransform(D3DVECTOR* world, D3DRMVECTOR4D* screen)
{
MINIWIN_NOT_IMPLEMENTED();
// Convert to screen coordinates
float screenX = screen->x / screen->z;
float screenY = screen->y / screen->w;
// Convert screen coordinates to NDC
float ndcX = screenX / m_width * 2.0f - 1.0f;
float ndcY = 1.0f - (screenY / m_height) * 2.0f;
float clipVec[4] = {ndcX * screen->w, ndcY * screen->w, screen->z, screen->w};
float viewVec[4] = {0.0f, 0.0f, 0.0f, 0.0f};
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
viewVec[j] += m_inverseProjectionMatrix[i][j] * clipVec[i];
}
}
float invViewMatrix[4][4];
D3DRMMatrixInvertOrthogonal(invViewMatrix, m_viewMatrix);
float worldVec[4] = {0.0f, 0.0f, 0.0f, 0.0f};
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
worldVec[j] += invViewMatrix[i][j] * viewVec[i];
}
}
// Perspective divide
if (worldVec[3] != 0.0f) {
world->x = worldVec[0] / worldVec[3];
world->y = worldVec[1] / worldVec[3];
world->z = worldVec[2] / worldVec[3];
}
else {
world->x = worldVec[0];
world->y = worldVec[1];
world->z = worldVec[2];
}
return DD_OK;
}

1
miniwin/src/internal/d3drmviewport_impl.h
View File

@ -43,6 +43,7 @@ struct Direct3DRMViewportImpl : public Direct3DRMObjectBaseImpl<IDirect3DRMViewp
DWORD m_height;
D3DRMMATRIX4D m_viewMatrix;
D3DRMMATRIX4D m_projectionMatrix;
D3DRMMATRIX4D m_inverseProjectionMatrix;
IDirect3DRMFrame* m_rootFrame = nullptr;
IDirect3DRMFrame* m_camera = nullptr;
D3DVALUE m_front = 1.f;