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swrast: add lod bias when texture sampling

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Mostly fixes progs/demos/lodbias when MESA_TEX_PROG=1.  But the LOD still
seems off by -1 or so.
May be an issue with the params passed to _swrast_compute_lambda()
This commit is contained in:
Brian Paul
2009-09-23 13:35:03 -06:00
parent 890f37d4d9
commit 2acd5de226
1 changed files with 7 additions and 2 deletions
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9
src/mesa/swrast/s_fragprog.c
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@@ -89,6 +89,8 @@ fetch_texel_lod( GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda,
* Fetch a texel with the given partial derivatives to compute a level
* of detail in the mipmap.
* Called via machine->FetchTexelDeriv()
* \param lodBias the lod bias which may be specified by a TXB instruction,
* otherwise zero.
*/
static void
fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
@@ -96,7 +98,8 @@ fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
GLfloat lodBias, GLuint unit, GLfloat color[4] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
const struct gl_texture_object *texObj = texUnit->_Current;
if (texObj) {
const struct gl_texture_image *texImg =
@@ -111,7 +114,9 @@ fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
texdx[3], texdy[3], /* dq/dx, dq/dy */
texW, texH,
texcoord[0], texcoord[1], texcoord[3],
1.0F / texcoord[3]) + lodBias;
1.0F / texcoord[3]);
lambda += lodBias + texUnit->LodBias + texObj->LodBias;
lambda = CLAMP(lambda, texObj->MinLod, texObj->MaxLod);