/**
* Called via the swrast->TextureSample[i] function pointer.
* Basically, given a texture object, an array of texture coords
* and an array of level-of-detail values, return an array of colors.
* In this case, determine the correct texture sampling routine
* (depending on filter mode, texture dimensions, etc) then call the
* sampler routine.
*/
static void
_swrast_validate_texture_sample( GLcontext *ctx, GLuint texUnit,
const struct gl_texture_object *tObj,
GLuint n, const GLfloat texcoords[][4],
const GLfloat lambda[], GLchan rgba[][4] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
_swrast_validate_derived( ctx );
/* Compute min/mag filter threshold */
if (tObj && tObj->MinFilter != tObj->MagFilter) {
if (tObj->MagFilter == GL_LINEAR
&& (tObj->MinFilter == GL_NEAREST_MIPMAP_NEAREST ||
tObj->MinFilter == GL_NEAREST_MIPMAP_LINEAR)) {
swrast->_MinMagThresh[texUnit] = 0.5F;
}
else {
swrast->_MinMagThresh[texUnit] = 0.0F;
}
}
swrast->TextureSample[texUnit] =
_swrast_choose_texture_sample_func( ctx, tObj );
swrast->TextureSample[texUnit]( ctx, texUnit, tObj, n, texcoords,
lambda, rgba );
}
void
_swrast_update_texture_samplers(GLcontext *ctx)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLuint u;
if (!swrast)
return; /* pipe hack */
for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
/* Note: If tObj is NULL, the sample function will be a simple
* function that just returns opaque black (0,0,0,1).
*/
swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
}
}
void
_swrast_update_texture_samplers(struct gl_context *ctx)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLuint u;
if (!swrast)
return; /* pipe hack */
for (u = 0; u < ARRAY_SIZE(swrast->TextureSample); u++) {
struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
/* Note: If tObj is NULL, the sample function will be a simple
* function that just returns opaque black (0,0,0,1).
*/
_mesa_update_fetch_functions(ctx, u);
swrast->TextureSample[u] =
_swrast_choose_texture_sample_func(ctx, tObj,
_mesa_get_samplerobj(ctx, u));
}
}
