/**
* Reference (or unreference) a texture object.
* If '*ptr', decrement *ptr's refcount (and delete if it becomes zero).
* If 'tex' is non-null, increment its refcount.
* This is normally only called from the _mesa_reference_texobj() macro
* when there's a real pointer change.
*/
void
_mesa_reference_texobj_(struct gl_texture_object **ptr,
struct gl_texture_object *tex)
{
assert(ptr);
if (*ptr) {
/* Unreference the old texture */
GLboolean deleteFlag = GL_FALSE;
struct gl_texture_object *oldTex = *ptr;
ASSERT(valid_texture_object(oldTex));
(void) valid_texture_object; /* silence warning in release builds */
_glthread_LOCK_MUTEX(oldTex->Mutex);
ASSERT(oldTex->RefCount > 0);
oldTex->RefCount--;
deleteFlag = (oldTex->RefCount == 0);
_glthread_UNLOCK_MUTEX(oldTex->Mutex);
if (deleteFlag) {
GET_CURRENT_CONTEXT(ctx);
if (ctx)
ctx->Driver.DeleteTexture(ctx, oldTex);
else
_mesa_problem(NULL, "Unable to delete texture, no context");
}
*ptr = NULL;
}
assert(!*ptr);
if (tex) {
/* reference new texture */
ASSERT(valid_texture_object(tex));
_glthread_LOCK_MUTEX(tex->Mutex);
if (tex->RefCount == 0) {
/* this texture's being deleted (look just above) */
/* Not sure this can every really happen. Warn if it does. */
_mesa_problem(NULL, "referencing deleted texture object");
*ptr = NULL;
}
else {
tex->RefCount++;
*ptr = tex;
}
_glthread_UNLOCK_MUTEX(tex->Mutex);
}
}
/**
* Bind a named texture to a texturing target.
*
* \param target texture target.
* \param texName texture name.
*
* \sa glBindTexture().
*
* Determines the old texture object bound and returns immediately if rebinding
* the same texture. Get the current texture which is either a default texture
* if name is null, a named texture from the hash, or a new texture if the
* given texture name is new. Increments its reference count, binds it, and
* calls dd_function_table::BindTexture. Decrements the old texture reference
* count and deletes it if it reaches zero.
*/
void GLAPIENTRY
_mesa_BindTexture( GLenum target, GLuint texName )
{
GET_CURRENT_CONTEXT(ctx);
struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
struct gl_texture_object *newTexObj = NULL;
GLint targetIndex;
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
_mesa_debug(ctx, "glBindTexture %s %d\n",
_mesa_lookup_enum_by_nr(target), (GLint) texName);
targetIndex = target_enum_to_index(ctx, target);
if (targetIndex < 0) {
_mesa_error(ctx, GL_INVALID_ENUM, "glBindTexture(target)");
return;
}
assert(targetIndex < NUM_TEXTURE_TARGETS);
/*
* Get pointer to new texture object (newTexObj)
*/
if (texName == 0) {
/* Use a default texture object */
newTexObj = ctx->Shared->DefaultTex[targetIndex];
}
else {
/* non-default texture object */
newTexObj = _mesa_lookup_texture(ctx, texName);
if (newTexObj) {
/* error checking */
if (newTexObj->Target != 0 && newTexObj->Target != target) {
/* the named texture object's target doesn't match the given target */
_mesa_error( ctx, GL_INVALID_OPERATION,
"glBindTexture(target mismatch)" );
return;
}
if (newTexObj->Target == 0) {
finish_texture_init(ctx, target, newTexObj);
}
}
else {
if (ctx->API == API_OPENGL_CORE) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glBindTexture");
return;
}
/* if this is a new texture id, allocate a texture object now */
newTexObj = ctx->Driver.NewTextureObject(ctx, texName, target);
if (!newTexObj) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindTexture");
return;
}
/* and insert it into hash table */
_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
_mesa_HashInsert(ctx->Shared->TexObjects, texName, newTexObj);
_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
}
newTexObj->Target = target;
}
assert(valid_texture_object(newTexObj));
/* Check if this texture is only used by this context and is already bound.
* If so, just return.
*/
{
GLboolean early_out;
_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
early_out = ((ctx->Shared->RefCount == 1)
&& (newTexObj == texUnit->CurrentTex[targetIndex]));
_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
if (early_out) {
return;
}
}
/* flush before changing binding */
FLUSH_VERTICES(ctx, _NEW_TEXTURE);
/* Do the actual binding. The refcount on the previously bound
* texture object will be decremented. It'll be deleted if the
* count hits zero.
*/
_mesa_reference_texobj(&texUnit->CurrentTex[targetIndex], newTexObj);
ASSERT(texUnit->CurrentTex[targetIndex]);
/* Pass BindTexture call to device driver */
if (ctx->Driver.BindTexture)
ctx->Driver.BindTexture(ctx, target, newTexObj);
}
