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chihiro.cpp: fiddle with backface culling (nw)

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This commit is contained in:
yz70s 2016-02-11 19:13:20 +01:00
parent 9c07f76389
commit d93b1366be
1 changed files with 30 additions and 7 deletions
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37
src/mame/video/chihiro.cpp
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@ -2552,6 +2552,7 @@ void nv2a_renderer::clear_depth_buffer(int what, UINT32 value)
UINT32 nv2a_renderer::render_triangle_culling(const rectangle &cliprect, render_delegate callback, int paramcount, const vertex_t &_v1, const vertex_t &_v2, const vertex_t &_v3)
{
float areax2;
NV2A_GL_CULL_FACE face = NV2A_GL_CULL_FACE::FRONT;
if (backface_culling_enabled == false)
return render_triangle(cliprect, callback, paramcount, _v1, _v2, _v3);
@ -2559,13 +2560,25 @@ UINT32 nv2a_renderer::render_triangle_culling(const rectangle &cliprect, render_
return 0;
areax2 = _v1.x*(_v2.y - _v3.y) + _v2.x*(_v3.y - _v1.y) + _v3.x*(_v1.y - _v2.y);
if (backface_culling_winding == NV2A_GL_FRONT_FACE::CCW)
areax2 = -areax2;
// if areax2 >= 0 then front faced else back faced
if ((backface_culling_culled == NV2A_GL_CULL_FACE::FRONT) && (areax2 >= 0))
return 0;
if ((backface_culling_culled == NV2A_GL_CULL_FACE::BACK) && (areax2 < 0))
return 0;
return render_triangle(cliprect, callback, paramcount, _v1, _v2, _v3);
{
if (-areax2 <= 0)
face = NV2A_GL_CULL_FACE::BACK;
else
face = NV2A_GL_CULL_FACE::FRONT;
} else
{
if (areax2 <= 0)
face = NV2A_GL_CULL_FACE::BACK;
else
face = NV2A_GL_CULL_FACE::FRONT;
}
if (face == NV2A_GL_CULL_FACE::FRONT)
if (backface_culling_culled == NV2A_GL_CULL_FACE::BACK)
return render_triangle(cliprect, callback, paramcount, _v1, _v2, _v3);
if (face == NV2A_GL_CULL_FACE::BACK)
if (backface_culling_culled == NV2A_GL_CULL_FACE::FRONT)
return render_triangle(cliprect, callback, paramcount, _v1, _v2, _v3);
return 0;
}
int nv2a_renderer::geforce_exec_method(address_space & space, UINT32 chanel, UINT32 subchannel, UINT32 method, UINT32 address, int &countlen)
@ -2580,6 +2593,16 @@ int nv2a_renderer::geforce_exec_method(address_space & space, UINT32 chanel, UIN
printf("A:%08X MTHD:%08X D:%08X\n\r",address,maddress,data);
#endif
if (maddress == 0x17fc) {
#if 1 // useful while debugging to see what coordinates have been used
static int debugvc = 0;
if (debugvc)
if (data == 0)
{
printf("%d %d\n\r", primitive_type, vertex_first);
for (int n = 0; n < vertex_first; n++)
printf("%d X:%f Y:%f Z:%f W:%f x:%f y:%f\n\r", n, vertex_software[n].attribute[0].fv[0], vertex_software[n].attribute[0].fv[1], vertex_software[n].attribute[0].fv[2], vertex_software[n].attribute[0].fv[3], vertex_xy[n].x, vertex_xy[n].y);
}
#endif
vertex_count = 0;
vertex_first = 0;
indexesleft_count = 0;