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| author | Maciej Cencora <m.cencora@gmail.com> | 2009-06-05 18:14:15 +0200 |
|---|---|---|
| committer | Maciej Cencora <m.cencora@gmail.com> | 2009-06-11 23:24:25 +0200 |
| commit | 28724b575d2c003d7f10f55dcb03ac969df94389 (patch) | |
| tree | 5cd7bb5c22782fd0417b9802ab8105db626ec988 /src/mesa/drivers/dri/r300 | |
| parent | b4ebd1c191e6760b334c35fa1df025ad129cc449 (diff) | |
r300: fix output register allocation for vertex shaders
If the vertex program wrote secondary color without primary color, the secondary color output register index would be 0 which resulted in overwriting vertex position in some cases.
Diffstat (limited to 'src/mesa/drivers/dri/r300')
| -rw-r--r-- | src/mesa/drivers/dri/r300/r300_vertprog.c | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/src/mesa/drivers/dri/r300/r300_vertprog.c b/src/mesa/drivers/dri/r300/r300_vertprog.c index a74b9156cf..1cacebf366 100644 --- a/src/mesa/drivers/dri/r300/r300_vertprog.c +++ b/src/mesa/drivers/dri/r300/r300_vertprog.c @@ -955,26 +955,36 @@ static void t_inputs_outputs(struct r300_vertex_program *vp) vp->outputs[VERT_RESULT_PSIZ] = cur_reg++; } + /* If we're writing back facing colors we need to send + * four colors to make front/back face colors selection work. + * If the vertex program doesn't write all 4 colors, lets + * pretend it does by skipping output index reg so the colors + * get written into appropriate output vectors. + */ if (vp->key.OutputsWritten & (1 << VERT_RESULT_COL0)) { vp->outputs[VERT_RESULT_COL0] = cur_reg++; + } else if (vp->key.OutputsWritten & (1 << VERT_RESULT_BFC0) || + vp->key.OutputsWritten & (1 << VERT_RESULT_BFC1)) { + cur_reg++; } if (vp->key.OutputsWritten & (1 << VERT_RESULT_COL1)) { - vp->outputs[VERT_RESULT_COL1] = - vp->outputs[VERT_RESULT_COL0] + 1; - cur_reg = vp->outputs[VERT_RESULT_COL1] + 1; + vp->outputs[VERT_RESULT_COL1] = cur_reg++; + } else if (vp->key.OutputsWritten & (1 << VERT_RESULT_BFC0) || + vp->key.OutputsWritten & (1 << VERT_RESULT_BFC1)) { + cur_reg++; } if (vp->key.OutputsWritten & (1 << VERT_RESULT_BFC0)) { - vp->outputs[VERT_RESULT_BFC0] = - vp->outputs[VERT_RESULT_COL0] + 2; - cur_reg = vp->outputs[VERT_RESULT_BFC0] + 2; + vp->outputs[VERT_RESULT_BFC0] = cur_reg++; + } else if (vp->key.OutputsWritten & (1 << VERT_RESULT_BFC1)) { + cur_reg++; } if (vp->key.OutputsWritten & (1 << VERT_RESULT_BFC1)) { - vp->outputs[VERT_RESULT_BFC1] = - vp->outputs[VERT_RESULT_COL0] + 3; - cur_reg = vp->outputs[VERT_RESULT_BFC1] + 1; + vp->outputs[VERT_RESULT_BFC1] = cur_reg++; + } else if (vp->key.OutputsWritten & (1 << VERT_RESULT_BFC0)) { + cur_reg++; } for (i = VERT_RESULT_TEX0; i <= VERT_RESULT_TEX7; i++) { |