Am 2004.10.13 03:51:44 +0200 schrieb(en) Eric Anholt:
[...]
> New patch at:
> http://pdx.freedesktop.org/~anholt/dri/r200-projtex-8.diff
[...]
It seems Radeon R100 and R200 can't do projective texturing when
using tiny vertices (without w).
While fiddling around with R100 and tvertex-patch i noticed:
1) R100 with current mesa-cvs HEAD (without t_vertex-patch)
does projective texturing right (projtex test)
There are no "additional corners" visible.
2) R100 with t_vertex patch shows "additional corners" like on R200.
3) I modified the t_vertex patch for radeon to never use
tiny vertices and then it worked there, too.
Unfortunately some surfaces are drawn black. (clipping issue?)
Or is there some other bit in a register that should get set/cleared to make
projtex work with tiny vertices?
greetings,
Andreas
void radeonChooseVertexState( GLcontext *ctx )
{
radeonContextPtr rmesa = RADEON_CONTEXT( ctx );
TNLcontext *tnl = TNL_CONTEXT(ctx);
GLuint se_coord_fmt;
/* HW perspective divide is a win, but tiny vertex formats are a
* bigger one.
*/
/* FIXME: radeon seems to do projective texturing wrong when using tiny vertices */
/* just disable it for all texturing... */
if ( ((tnl->render_inputs & _TNL_BITS_TEX_ANY) == 0)
/*
|| (ctx->_TriangleCaps & (DD_TRI_LIGHT_TWOSIDE|DD_TRI_UNFILLED)) */ ) {
rmesa->swtcl.needproj = GL_TRUE;
se_coord_fmt = (RADEON_VTX_XY_PRE_MULT_1_OVER_W0 |
RADEON_VTX_Z_PRE_MULT_1_OVER_W0 |
RADEON_TEX1_W_ROUTING_USE_Q1);
}
else {
rmesa->swtcl.needproj = GL_FALSE;
se_coord_fmt = (RADEON_VTX_W0_IS_NOT_1_OVER_W0 |
RADEON_TEX1_W_ROUTING_USE_Q1);
}
_tnl_need_projected_coords( ctx, rmesa->swtcl.needproj );
if ( se_coord_fmt != rmesa->hw.set.cmd[SET_SE_COORDFMT] ) {
RADEON_STATECHANGE( rmesa, set );
rmesa->hw.set.cmd[SET_SE_COORDFMT] = se_coord_fmt;
}
}
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