From 50a5d5dea0c21886bc3445c0ad0928b03e64ab10 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Wed, 20 Feb 2013 14:00:47 -0800 Subject: [PATCH] i965: Fix the W value of deprecated pointcoords on pre-gen6. When you didn't have a texcoord array bound (or a non-1 current w attrib), we were telling the fragment shader that it could just use "1" instead of doing expensive pre-gen6 math to invert it. If you drew the point with a non-1 W value, then you'd get the right size (since all the vertex computations worked), but we'd mis-interpolate the coordinate across the face. Fixes the mesa pointsprite demo on GM45. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=30232 Reviewed-and-tested-by: Ian Romanick Note: This is a candidate for the stable branches. --- src/mesa/drivers/dri/i965/brw_vs_constval.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/src/mesa/drivers/dri/i965/brw_vs_constval.c b/src/mesa/drivers/dri/i965/brw_vs_constval.c index 3d53843..48635c5 100644 --- a/src/mesa/drivers/dri/i965/brw_vs_constval.c +++ b/src/mesa/drivers/dri/i965/brw_vs_constval.c @@ -238,6 +238,23 @@ static void calc_wm_input_sizes( struct brw_context *brw ) calc_sizes(&t); + /* _NEW_POINT + * + * If the SF will be replacing the vertex output with a reference to + * gl_PointCoord, then tell the fragment shader that the value actually + * does vary. + */ + if (ctx->Point.PointSprite) { + for (int i = 0; i < 8; i++) { + if (ctx->Point.CoordReplace[i]) { + t.size_masks[4-1] |= FRAG_BIT_TEX(i); + t.size_masks[3-1] |= FRAG_BIT_TEX(i); + t.size_masks[2-1] |= FRAG_BIT_TEX(i); + t.size_masks[1-1] |= FRAG_BIT_TEX(i); + } + } + } + if (memcmp(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks)) != 0) { memcpy(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks)); brw->state.dirty.brw |= BRW_NEW_WM_INPUT_DIMENSIONS; @@ -246,7 +263,7 @@ static void calc_wm_input_sizes( struct brw_context *brw ) const struct brw_tracked_state brw_wm_input_sizes = { .dirty = { - .mesa = _NEW_LIGHT | _NEW_PROGRAM, + .mesa = _NEW_LIGHT | _NEW_PROGRAM | _NEW_POINT, .brw = BRW_NEW_VERTEX_PROGRAM | BRW_NEW_INPUT_DIMENSIONS, .cache = 0 }, -- 2.7.4