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Saturn: Optimise transform function slightly

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UnknownShadow200 2025-04-04 07:10:04 +11:00
parent d8f5f00aac
commit 4afe9de86b
1 changed files with 38 additions and 23 deletions
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61
src/Graphics_Saturn.c
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@ -374,32 +374,32 @@ void Gfx_DeleteDynamicVb(GfxResourceID* vb) { Gfx_DeleteVb(vb); }
*---------------------------------------------------------Matrices--------------------------------------------------------*
*#########################################################################################################################*/
static struct Matrix _view, _proj;
struct MatrixRow { int x, y, z, w; };
struct MatrixMVP { struct MatrixRow row1, row2, row3, trans; };
struct MatrixCol { int trans, col1, col2, col3; };
struct MatrixMVP { struct MatrixCol w, x, y, z; };
static struct MatrixMVP mvp_;
#define ToFixed(v) (int)(v * (1 << 12))
static void LoadTransformMatrix(struct Matrix* src) {
mvp_.trans.x = XYZFixed(1) * ToFixed(src->row4.x);
mvp_.trans.y = XYZFixed(1) * ToFixed(src->row4.y);
mvp_.trans.z = XYZFixed(1) * ToFixed(src->row4.z);
mvp_.trans.w = XYZFixed(1) * ToFixed(src->row4.w);
mvp_.x.trans = XYZFixed(1) * ToFixed(src->row4.x);
mvp_.y.trans = XYZFixed(1) * ToFixed(src->row4.y);
mvp_.z.trans = XYZFixed(1) * ToFixed(src->row4.z);
mvp_.w.trans = XYZFixed(1) * ToFixed(src->row4.w);
mvp_.row1.x = ToFixed(src->row1.x);
mvp_.row1.y = ToFixed(src->row1.y);
mvp_.row1.z = ToFixed(src->row1.z);
mvp_.row1.w = ToFixed(src->row1.w);
mvp_.x.col1 = ToFixed(src->row1.x);
mvp_.y.col1 = ToFixed(src->row1.y);
mvp_.z.col1 = ToFixed(src->row1.z);
mvp_.w.col1 = ToFixed(src->row1.w);
mvp_.row2.x = ToFixed(src->row2.x);
mvp_.row2.y = ToFixed(src->row2.y);
mvp_.row2.z = ToFixed(src->row2.z);
mvp_.row2.w = ToFixed(src->row2.w);
mvp_.x.col2 = ToFixed(src->row2.x);
mvp_.y.col2 = ToFixed(src->row2.y);
mvp_.z.col2 = ToFixed(src->row2.z);
mvp_.w.col2 = ToFixed(src->row2.w);
mvp_.row3.x = ToFixed(src->row3.x);
mvp_.row3.y = ToFixed(src->row3.y);
mvp_.row3.z = ToFixed(src->row3.z);
mvp_.row3.w = ToFixed(src->row3.w);
mvp_.x.col3 = ToFixed(src->row3.x);
mvp_.y.col3 = ToFixed(src->row3.y);
mvp_.z.col3 = ToFixed(src->row3.z);
mvp_.w.col3 = ToFixed(src->row3.w);
}
void Gfx_LoadMatrix(MatrixType type, const struct Matrix* matrix) {
@ -475,18 +475,33 @@ void Gfx_DrawVb_Lines(int verticesCount) {
}
static int Transform(IVec3* result, struct SATVertexTextured* a) {
int w = a->x * mvp_.row1.w + a->y * mvp_.row2.w + a->z * mvp_.row3.w + mvp_.trans.w;
// Calculates v->x * col1 + v->y * col2 + v->z * col3 + trans
static int __attribute__((always_inline)) TransformVector(struct SATVertexTextured* v, struct MatrixCol* col) {
int res;
__asm__("lds.l @%[col]+, MACL \n"
"mac.l @%[col]+, @%[vec]+ \n"
"mac.l @%[col]+, @%[vec]+ \n"
"mac.l @%[col]+, @%[vec]+ \n"
"sts macl, %[res] \n"
: [col] "+r" (col), [vec] "+r" (v), [res] "=r" (res)
: "m" (*v), "m" (*col)
: "mach", "macl", "memory");
return res;
}
int Transform(IVec3* result, struct SATVertexTextured* a) {
int w = TransformVector(a, &mvp_.w);
if (w <= 0) return 1;
int x = a->x * mvp_.row1.x + a->y * mvp_.row2.x + a->z * mvp_.row3.x + mvp_.trans.x;
int x = TransformVector(a, &mvp_.x);
cpu_divu_32_32_set(x * (SCREEN_WIDTH/2), w);
int y = a->x * mvp_.row1.y + a->y * mvp_.row2.y + a->z * mvp_.row3.y + mvp_.trans.y;
int y = TransformVector(a, &mvp_.y);
result->x = cpu_divu_quotient_get();
cpu_divu_32_32_set(y * -(SCREEN_HEIGHT/2), w);
int z = a->x * mvp_.row1.z + a->y * mvp_.row2.z + a->z * mvp_.row3.z + mvp_.trans.z;
int z = TransformVector(a, &mvp_.z);
result->y = cpu_divu_quotient_get();
cpu_divu_32_32_set(z * 512, w);