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32 lines
1.5 KiB
C
32 lines
1.5 KiB
C
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#include "pspmath.h"
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void vfpu_perspective_matrix(ScePspFMatrix4 *m, float fovy, float aspect, float near, float far) {
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__asm__ volatile (
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"vmzero.q M100\n" // set M100 to all zeros
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"mtv %1, S000\n" // S000 = fovy
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"viim.s S001, 90\n" // S002 = 90.0f
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"vrcp.s S001, S001\n" // S002 = 1/90
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"vmul.s S000, S000, S000[1/2]\n" // S000 = fovy * 0.5 = fovy/2
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"vmul.s S000, S000, S001\n" // S000 = (fovy/2)/90
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"vrot.p C002, S000, [c, s]\n" // S002 = cos(angle), S003 = sin(angle)
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"vdiv.s S100, S002, S003\n" // S100 = m->x.x = cotangent = cos(angle)/sin(angle)
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"mtv %3, S001\n" // S001 = near
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"mtv %4, S002\n" // S002 = far
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"vsub.s S003, S001, S002\n" // S003 = deltaz = near-far
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"vrcp.s S003, S003\n" // S003 = 1/deltaz
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"mtv %2, S000\n" // S000 = aspect
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"vmov.s S111, S100\n" // S111 = m->y.y = cotangent
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"vdiv.s S100, S100, S000\n" // S100 = m->x.x = cotangent / aspect
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"vadd.s S122, S001, S002\n" // S122 = m->z.z = far + near
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"vmul.s S122, S122, S003\n" // S122 = m->z.z = (far+near)/deltaz
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"vmul.s S132, S001, S002\n" // S132 = m->w.z = far * near
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"vmul.s S132, S132, S132[2]\n" // S132 = m->w.z = 2 * (far*near)
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"vmul.s S132, S132, S003\n" // S132 = m->w.z = 2 * (far*near) / deltaz
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"vsub.s S123, S123, S123[1]\n" // S123 = m->z.w = -1.0
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"sv.q C100, 0 + %0\n"
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"sv.q C110, 16 + %0\n"
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"sv.q C120, 32 + %0\n"
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"sv.q C130, 48 + %0\n"
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:"=m"(*m): "r"(fovy),"r"(aspect),"r"(near),"r"(far));
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}
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