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optimised matrix interpolation

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Isaac0-dev 2025-06-09 23:22:10 +10:00
parent 68b700ccfb
commit 4d942eadad
1 changed files with 18 additions and 16 deletions
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34
src/game/rendering_graph_node.c
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@ -239,8 +239,6 @@ void patch_mtx_before(void) {
}
void patch_mtx_interpolated(f32 delta) {
Mtx camTranfInv, prevCamTranfInv;
if (sPerspectiveNode != NULL) {
if (gCamSkipInterp) {
sPerspectiveNode->prevFov = sPerspectiveNode->fov;
@ -303,36 +301,40 @@ void patch_mtx_interpolated(f32 delta) {
// calculate outside of for loop to reduce overhead
// technically this is improper use of mtxf functions, but coop doesn't target N64
Mtx camTranfInv, prevCamTranfInv;
Mtx camInterp;
bool translateCamSpace = (gMtxTblSize > 0) && sCameraNode && (sCameraNode->matrixPtr != NULL) && (sCameraNode->matrixPtrPrev != NULL);
if (translateCamSpace) {
// compute inverse camera matrix to transform out of camera space later
mtxf_inverse(camTranfInv.m, *sCameraNode->matrixPtr);
mtxf_inverse(prevCamTranfInv.m, *sCameraNode->matrixPtrPrev);
// use camera node's stored information to calculate interpolated camera transform
Vec3f posInterp, focusInterp;
delta_interpolate_vec3f(posInterp, sCameraNode->prevPos, sCameraNode->pos, delta);
delta_interpolate_vec3f(focusInterp, sCameraNode->prevFocus, sCameraNode->focus, delta);
mtxf_lookat(camInterp.m, posInterp, focusInterp, sCameraNode->roll);
mtxf_to_mtx(&camInterp, camInterp.m);
}
for (s32 i = 0; i < gMtxTblSize; i++) {
Mtx bufMtx, bufMtxPrev;
memcpy(bufMtx.m, ((Mtx*) gMtxTbl[i].mtx)->m, sizeof(f32) * 4 * 4);
memcpy(bufMtxPrev.m, ((Mtx*) gMtxTbl[i].mtxPrev)->m, sizeof(f32) * 4 * 4);
Gfx *pos = gMtxTbl[i].pos;
Mtx *srcMtx = gMtxTbl[i].mtx;
Mtx *srcMtxPrev = gMtxTbl[i].mtxPrev;
if (gMtxTbl[i].usingCamSpace && translateCamSpace) {
// transform out of camera space so the matrix can interp in world space
Mtx bufMtx, bufMtxPrev;
mtxf_copy(bufMtx.m, srcMtx->m);
mtxf_copy(bufMtxPrev.m, srcMtxPrev->m);
mtxf_mul(bufMtx.m, bufMtx.m, camTranfInv.m);
mtxf_mul(bufMtxPrev.m, bufMtxPrev.m, prevCamTranfInv.m);
srcMtx = &bufMtx;
srcMtxPrev = &bufMtxPrev;
}
delta_interpolate_mtx(&gMtxTbl[i].interp, &bufMtxPrev, &bufMtx, delta);
delta_interpolate_mtx(&gMtxTbl[i].interp, srcMtxPrev, srcMtx, delta);
if (gMtxTbl[i].usingCamSpace) {
// transform back to camera space, respecting camera interpolation
Mtx camInterp;
Vec3f posInterp, focusInterp;
// use camera node's stored information to calculate interpolated camera transform
delta_interpolate_vec3f(posInterp, sCameraNode->prevPos, sCameraNode->pos, delta);
delta_interpolate_vec3f(focusInterp, sCameraNode->prevFocus, sCameraNode->focus, delta);
mtxf_lookat(camInterp.m, posInterp, focusInterp, sCameraNode->roll);
mtxf_to_mtx(&camInterp, camInterp.m);
mtxf_mul(gMtxTbl[i].interp.m, gMtxTbl[i].interp.m, camInterp.m);
}
gSPMatrix(pos++, VIRTUAL_TO_PHYSICAL(&gMtxTbl[i].interp),