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/**************************************************************************
*
* Copyright 2007 VMware, Inc.
* 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 VMWARE 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 <keithw@vmware.com>
* Brian Paul
* Zack Rusin
*/
#include <assert.h>
#include "st_context.h"
#include "st_atom.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "cso_cache/cso_context.h"
#include "main/core.h"
#include "main/stencil.h"
/**
* Convert an OpenGL compare mode to a pipe tokens.
*/
GLuint
st_compare_func_to_pipe(GLenum func)
{
/* Same values, just biased */
STATIC_ASSERT(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
STATIC_ASSERT(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
STATIC_ASSERT(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
STATIC_ASSERT(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
STATIC_ASSERT(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
STATIC_ASSERT(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
STATIC_ASSERT(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
STATIC_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_pipe(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_pipe()" == NULL);
return 0;
}
}
void
st_update_depth_stencil_alpha(struct st_context *st)
{
struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;
struct pipe_stencil_ref sr;
struct gl_context *ctx = st->ctx;
memset(dsa, 0, sizeof(*dsa));
memset(&sr, 0, sizeof(sr));
if (ctx->DrawBuffer->Visual.depthBits > 0) {
if (ctx->Depth.Test) {
dsa->depth.enabled = 1;
dsa->depth.writemask = ctx->Depth.Mask;
dsa->depth.func = st_compare_func_to_pipe(ctx->Depth.Func);
}
if (ctx->Depth.BoundsTest) {
dsa->depth.bounds_test = 1;
dsa->depth.bounds_min = ctx->Depth.BoundsMin;
dsa->depth.bounds_max = ctx->Depth.BoundsMax;
}
}
if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) {
dsa->stencil[0].enabled = 1;
dsa->stencil[0].func = st_compare_func_to_pipe(ctx->Stencil.Function[0]);
dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[0]);
dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[0]);
dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[0]);
dsa->stencil[0].valuemask = ctx->Stencil.ValueMask[0] & 0xff;
dsa->stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
sr.ref_value[0] = _mesa_get_stencil_ref(ctx, 0);
if (_mesa_stencil_is_two_sided(ctx)) {
const GLuint back = ctx->Stencil._BackFace;
dsa->stencil[1].enabled = 1;
dsa->stencil[1].func = st_compare_func_to_pipe(ctx->Stencil.Function[back]);
dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[back]);
dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[back]);
dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[back]);
dsa->stencil[1].valuemask = ctx->Stencil.ValueMask[back] & 0xff;
dsa->stencil[1].writemask = ctx->Stencil.WriteMask[back] & 0xff;
sr.ref_value[1] = _mesa_get_stencil_ref(ctx, back);
}
else {
/* This should be unnecessary. Drivers must not expect this to
* contain valid data, except the enabled bit
*/
dsa->stencil[1] = dsa->stencil[0];
dsa->stencil[1].enabled = 0;
sr.ref_value[1] = sr.ref_value[0];
}
}
if (ctx->Color.AlphaEnabled &&
!(ctx->DrawBuffer->_IntegerBuffers & 0x1)) {
dsa->alpha.enabled = 1;
dsa->alpha.func = st_compare_func_to_pipe(ctx->Color.AlphaFunc);
dsa->alpha.ref_value = ctx->Color.AlphaRefUnclamped;
}
cso_set_depth_stencil_alpha(st->cso_context, dsa);
cso_set_stencil_ref(st->cso_context, &sr);
}
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