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Fix texture issues

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This commit is contained in:
Luke Benstead 2022-04-26 18:15:08 +01:00
parent 6f2b4d8f9f
commit 4e8ff2f8e4
1 changed files with 13 additions and 16 deletions
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29
GL/flush.c
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@ -6,9 +6,9 @@ PolyList OP_LIST;
PolyList PT_LIST;
PolyList TR_LIST;
/** Don't fully comply to the GL standard to make some performance
* gains. Specifically glDepthRange will be ignored, and the final
* Z coordinate will be invW and not between 0 and 1.
/**
* FAST_MODE will use invW for all Z coordinates sent to the
* GPU.
*
* This will break orthographic mode so default is FALSE
**/
@ -120,19 +120,16 @@ GL_FORCE_INLINE void glPerspectiveDivideStandard(void* src, uint32_t n) {
VIEWPORT.hheight, vertex->xyz[1] * f, VIEWPORT.y_plus_hheight
);
/* FIXME: Apply depth range */
/* After multiplying by 'f', the Z coordinate is between
* -1 and 1. We then need to shift it into a value > 0.00001f
* where the larger value becomes smaller and vice-versa (because
* the PVR works backwards).
*
* If we multipled the lowest value (-1) by -1 it becomes 1, if
* we multiply the lowest value (1) by -1 it becomes, then we need
* to add 1 to get it in the range 0 - 2. Then we add a little offset
* and this approach means we can just use FMAC.
* */
vertex->xyz[2] = __builtin_fmaf((vertex->xyz[2] * f), -1.0f, 1.00001f);
/* Orthographic projections need to use invZ otherwise we lose
the depth information. As w == 1, and clip-space range is -w to +w
we add 1.0 to the Z to bring it into range. We add a little extra to
avoid a divide by zero.
*/
if(unlikely(vertex->w == 1.0f)) {
vertex->xyz[2] = MATH_Fast_Invert(1.0001f + vertex->xyz[2]);
} else {
vertex->xyz[2] = f;
}
}
++vertex;