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authorRoland Scheidegger <sroland@tungstengraphics.com>2007-10-03 22:20:44 +0200
committerRoland Scheidegger <sroland@tungstengraphics.com>2007-10-03 22:20:44 +0200
commitdb0f050582e73d64b7d260275ff0c1eed912b35d (patch)
tree4b7c3a1901fb93e58f54b818a27603470c0b760e /src/mesa/tnl
parent58cdd1dc520d211b65f05fd06b5ba472f552853c (diff)
minor fog calc cleanup
Diffstat (limited to 'src/mesa/tnl')
-rw-r--r--src/mesa/tnl/t_vb_fog.c20
1 files changed, 8 insertions, 12 deletions
diff --git a/src/mesa/tnl/t_vb_fog.c b/src/mesa/tnl/t_vb_fog.c
index f6518500d8..d8bca3820b 100644
--- a/src/mesa/tnl/t_vb_fog.c
+++ b/src/mesa/tnl/t_vb_fog.c
@@ -41,7 +41,6 @@
struct fog_stage_data {
GLvector4f fogcoord; /* has actual storage allocated */
- GLvector4f input; /* points into VB->EyePtr Z values */
};
#define FOG_STAGE_DATA(stage) ((struct fog_stage_data *)stage->privatePtr)
@@ -91,7 +90,8 @@ init_static_data( void )
* evaluating the GL_LINEAR, GL_EXP or GL_EXP2 fog function.
* Fog coordinates are distances from the eye (typically between the
* near and far clip plane distances).
- * Note the fog (eye Z) coords may be negative so we use ABS(z) below.
+ * Note that fogcoords may be negative, if eye z is source absolute
+ * value must be taken earlier.
* Fog blend factors are in the range [0,1].
*/
static void
@@ -169,13 +169,10 @@ run_fog_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage)
*/
input = &store->fogcoord;
- /* NOTE: negate plane here so we get positive fog coords! */
- /* NOTE2: this doesn't always work (tests/fog - all frag depth fog
- coords will be negative). */
- plane[0] = -m[2];
- plane[1] = -m[6];
- plane[2] = -m[10];
- plane[3] = -m[14];
+ plane[0] = m[2];
+ plane[1] = m[6];
+ plane[2] = m[10];
+ plane[3] = m[14];
/* Full eye coords weren't required, just calculate the
* eye Z values.
*/
@@ -189,12 +186,12 @@ run_fog_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage)
NOTE should avoid going through array twice */
coord = input->start;
for (i = 0; i < input->count; i++) {
- input->data[i][0] = FABSF(*coord);
+ *coord = FABSF(*coord);
STRIDE_F(coord, input->stride);
}
}
else {
- /* fog coordinates = eye Z coordinates (use ABS later) */
+ /* fog coordinates = eye Z coordinates - need to copy for ABS */
input = &store->fogcoord;
if (VB->EyePtr->size < 2)
@@ -249,7 +246,6 @@ alloc_fog_data(GLcontext *ctx, struct tnl_pipeline_stage *stage)
return GL_FALSE;
_mesa_vector4f_alloc( &store->fogcoord, 0, tnl->vb.Size, 32 );
- _mesa_vector4f_init( &store->input, 0, NULL );
if (!inited)
init_static_data();