According to bspec, MIPCnt(was set to intelObj->_MaxLevel) was used for
min/mag filter mode determination. For a normal case with no mipmap like
this:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
hardware would always choose mag filter(GL_LINEAR) here since MIPCnt was
set to 0 zero, then would make LOD be zero. Then according the formula:
MagMode = (LOD - Base <= 0)
Thus hardware choose Mag filter.
This would fix all oglc filtercubemin subcase fail
Signed-off-by: Yuanhan Liu <yuanhan....@linux.intel.com>
---
src/mesa/drivers/dri/intel/intel_tex_validate.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/src/mesa/drivers/dri/intel/intel_tex_validate.c
b/src/mesa/drivers/dri/intel/intel_tex_validate.c
index e2b8699..c06a043 100644
--- a/src/mesa/drivers/dri/intel/intel_tex_validate.c
+++ b/src/mesa/drivers/dri/intel/intel_tex_validate.c
@@ -21,8 +21,14 @@ intel_update_max_level(struct intel_texture_object *intelObj,
{
struct gl_texture_object *tObj = &intelObj->base;
- if (sampler->MinFilter == GL_NEAREST ||
- sampler->MinFilter == GL_LINEAR) {
+ /*
+ * According to Bspec vol5c 1.2.1.5 LOD Computation Pseudocode,
+ * the MIPCnt(here intelObj->_MaxLevel) was used for min/mag
+ * determination.
+ */
+ if ((sampler->MinFilter == sampler->MagFilter) &&
+ (sampler->MinFilter == GL_NEAREST ||
+ sampler->MinFilter == GL_LINEAR)) {
intelObj->_MaxLevel = tObj->BaseLevel;
} else {
intelObj->_MaxLevel = tObj->_MaxLevel;
--
1.7.4.4
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/mesa-dev
