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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
* Brian Paul
*/
#include "st_context.h"
#include "st_cache.h"
#include "st_atom.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
/**
* Convert GLenum stencil func tokens to pipe tokens.
*/
static GLuint
gl_alpha_func_to_sp(GLenum func)
{
/* Same values, just biased */
assert(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
assert(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
assert(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
assert(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
assert(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
assert(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
assert(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
assert(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
assert(func >= GL_NEVER);
assert(func <= GL_ALWAYS);
return func - GL_NEVER;
}
static void
update_alpha_test( struct st_context *st )
{
struct pipe_alpha_test_state alpha;
const struct cso_alpha_test *cso;
memset(&alpha, 0, sizeof(alpha));
if (st->ctx->Color.AlphaEnabled) {
alpha.enabled = 1;
alpha.func = gl_alpha_func_to_sp(st->ctx->Color.AlphaFunc);
alpha.ref = st->ctx->Color.AlphaRef;
}
cso = st_cached_alpha_test_state(st, &alpha);
if (st->state.alpha_test != cso) {
/* state has changed */
st->state.alpha_test = cso;
st->pipe->bind_alpha_test_state(st->pipe, cso->data); /* bind new state */
}
}
const struct st_tracked_state st_update_alpha_test = {
.name = "st_update_alpha_test",
.dirty = {
.mesa = (_NEW_COLOR),
.st = 0,
},
.update = update_alpha_test
};
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