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authorEric Anholt <eric@anholt.net>2010-06-04 13:27:05 -0700
committerEric Anholt <eric@anholt.net>2010-06-04 13:28:48 -0700
commitb80a728f8a86cbd1efce9611d822ab73b5baeab9 (patch)
treec5dd964a9587a0549399ec9fe8200db8326e9a5b /src/mesa/drivers/dri
parent18a6e5ee73c5cef283c6bef906e5f8e4f60d4000 (diff)
i915: Clamp minimum lod to maximum texture level too.
Otherwise, we'd run into minlod > maxlod, and the sampler would give us the undefined we asked for. Bug #24846. Fixes OGLC texlod.c.
Diffstat (limited to 'src/mesa/drivers/dri')
-rw-r--r--src/mesa/drivers/dri/i915/i915_texstate.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i915/i915_texstate.c b/src/mesa/drivers/dri/i915/i915_texstate.c
index ff9ab88c5a..9c56b55fee 100644
--- a/src/mesa/drivers/dri/i915/i915_texstate.c
+++ b/src/mesa/drivers/dri/i915/i915_texstate.c
@@ -281,6 +281,7 @@ i915_update_tex_unit(struct intel_context *intel, GLuint unit, GLuint ss3)
GLenum ws = tObj->WrapS;
GLenum wt = tObj->WrapT;
GLenum wr = tObj->WrapR;
+ float minlod;
/* We program 1D textures as 2D textures, so the 2D texcoord could
* result in sampling border values if we don't set the T wrap to
@@ -321,8 +322,9 @@ i915_update_tex_unit(struct intel_context *intel, GLuint unit, GLuint ss3)
(translate_wrap_mode(wt) << SS3_TCY_ADDR_MODE_SHIFT) |
(translate_wrap_mode(wr) << SS3_TCZ_ADDR_MODE_SHIFT));
+ minlod = MIN2(tObj->MinLod, tObj->_MaxLevel - tObj->BaseLevel);
state[I915_TEXREG_SS3] |= (unit << SS3_TEXTUREMAP_INDEX_SHIFT);
- state[I915_TEXREG_SS3] |= (U_FIXED(CLAMP(tObj->MinLod, 0.0, 11.0), 4) <<
+ state[I915_TEXREG_SS3] |= (U_FIXED(CLAMP(minlod, 0.0, 11.0), 4) <<
SS3_MIN_LOD_SHIFT);
}