OrdinaryMagician/vkdoom_m
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- improve triangle setup performance a little bit

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This commit is contained in:
Magnus Norddahl 2017-03-24 20:00:53 +01:00
commit ac518e23bf
3 changed files with 237 additions and 1 deletions
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34
src/polyrenderer/drawers/poly_triangle.cpp
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@ -190,6 +190,7 @@ void PolyTriangleDrawer::draw_shaded_triangle(const ShadedTriVertex *vert, bool
TriVertex clippedvert[max_additional_vertices];
int numclipvert = clipedge(vert, clippedvert);
#ifdef NO_SSE
// Map to 2D viewport:
for (int j = 0; j < numclipvert; j++)
{
@ -205,6 +206,39 @@ void PolyTriangleDrawer::draw_shaded_triangle(const ShadedTriVertex *vert, bool
v.x = viewport_x + viewport_width * (1.0f + v.x) * 0.5f;
v.y = viewport_y + viewport_height * (1.0f - v.y) * 0.5f;
}
#else
// Map to 2D viewport:
__m128 mviewport_x = _mm_set1_ps((float)viewport_x);
__m128 mviewport_y = _mm_set1_ps((float)viewport_y);
__m128 mviewport_halfwidth = _mm_set1_ps(viewport_width * 0.5f);
__m128 mviewport_halfheight = _mm_set1_ps(viewport_height * 0.5f);
__m128 mone = _mm_set1_ps(1.0f);
int sse_length = (numclipvert + 3) / 4 * 4;
for (int j = 0; j < sse_length; j += 4)
{
__m128 vx = _mm_loadu_ps(&clippedvert[j].x);
__m128 vy = _mm_loadu_ps(&clippedvert[j + 1].x);
__m128 vz = _mm_loadu_ps(&clippedvert[j + 2].x);
__m128 vw = _mm_loadu_ps(&clippedvert[j + 3].x);
_MM_TRANSPOSE4_PS(vx, vy, vz, vw);
// Calculate normalized device coordinates:
vw = _mm_div_ps(mone, vw);
vx = _mm_mul_ps(vx, vw);
vy = _mm_mul_ps(vy, vw);
vz = _mm_mul_ps(vz, vw);
// Apply viewport scale to get screen coordinates:
vx = _mm_add_ps(mviewport_x, _mm_mul_ps(mviewport_halfwidth, _mm_add_ps(mone, vx)));
vy = _mm_add_ps(mviewport_y, _mm_mul_ps(mviewport_halfheight, _mm_sub_ps(mone, vy)));
_MM_TRANSPOSE4_PS(vx, vy, vz, vw);
_mm_storeu_ps(&clippedvert[j].x, vx);
_mm_storeu_ps(&clippedvert[j + 1].x, vy);
_mm_storeu_ps(&clippedvert[j + 2].x, vz);
_mm_storeu_ps(&clippedvert[j + 3].x, vw);
}
#endif
// Keep varyings in -128 to 128 range if possible
if (numclipvert > 0)