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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_atom.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
/**
* Convert GLenum stencil func tokens to pipe tokens.
*/
static GLuint
gl_stencil_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;
}
/**
* Convert GLenum stencil op tokens to pipe tokens.
*/
static GLuint
gl_stencil_op_to_sp(GLenum func)
{
switch (func) {
case GL_KEEP:
return PIPE_STENCIL_OP_KEEP;
case GL_ZERO:
return PIPE_STENCIL_OP_ZERO;
case GL_REPLACE:
return PIPE_STENCIL_OP_REPLACE;
case GL_INCR:
return PIPE_STENCIL_OP_INCR;
case GL_DECR:
return PIPE_STENCIL_OP_DECR;
case GL_INCR_WRAP:
return PIPE_STENCIL_OP_INCR_WRAP;
case GL_DECR_WRAP:
return PIPE_STENCIL_OP_DECR_WRAP;
case GL_INVERT:
return PIPE_STENCIL_OP_INVERT;
default:
assert("invalid GL token in gl_stencil_op_to_sp()" == NULL);
return 0;
}
}
static void
update_stencil( struct st_context *st )
{
struct pipe_stencil_state stencil;
memset(&stencil, 0, sizeof(stencil));
if (st->ctx->Stencil.Enabled) {
stencil.front_enabled = 1;
stencil.front_func = gl_stencil_func_to_sp(st->ctx->Stencil.Function[0]);
stencil.front_fail_op = gl_stencil_op_to_sp(st->ctx->Stencil.FailFunc[0]);
stencil.front_zfail_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZFailFunc[0]);
stencil.front_zpass_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZPassFunc[0]);
stencil.ref_value[0] = st->ctx->Stencil.Ref[0] & 0xff;
stencil.value_mask[0] = st->ctx->Stencil.ValueMask[0] & 0xff;
stencil.write_mask[0] = st->ctx->Stencil.WriteMask[0] & 0xff;
if (st->ctx->Stencil.TestTwoSide) {
stencil.back_enabled = 1;
stencil.back_func = gl_stencil_func_to_sp(st->ctx->Stencil.Function[1]);
stencil.back_fail_op = gl_stencil_op_to_sp(st->ctx->Stencil.FailFunc[1]);
stencil.back_zfail_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZFailFunc[1]);
stencil.back_zpass_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZPassFunc[1]);
stencil.ref_value[1] = st->ctx->Stencil.Ref[1] & 0xff;
stencil.value_mask[1] = st->ctx->Stencil.ValueMask[1] & 0xff;
stencil.write_mask[1] = st->ctx->Stencil.WriteMask[1] & 0xff;
}
stencil.clear_value = st->ctx->Stencil.Clear & 0xff;
}
if (memcmp(&stencil, &st->state.stencil, sizeof(stencil)) != 0) {
/* state has changed */
st->state.stencil = stencil; /* struct copy */
st->pipe->set_stencil_state(st->pipe, &stencil); /* set new state */
}
}
const struct st_tracked_state st_update_stencil = {
.name = "st_update_stencil",
.dirty = {
.mesa = (_NEW_STENCIL),
.st = 0,
},
.update = update_stencil
};
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