1/**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 /*
29  * Authors:
30  *   Keith Whitwell <keith@tungstengraphics.com>
31  *   Brian Paul
32  *   Zack  Rusin
33  */
34
35
36#include <assert.h>
37
38#include "st_context.h"
39#include "st_atom.h"
40#include "pipe/p_context.h"
41#include "pipe/p_defines.h"
42#include "cso_cache/cso_context.h"
43
44
45/**
46 * Convert an OpenGL compare mode to a pipe tokens.
47 */
48GLuint
49st_compare_func_to_pipe(GLenum func)
50{
51   /* Same values, just biased */
52   STATIC_ASSERT(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
53   STATIC_ASSERT(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
54   STATIC_ASSERT(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
55   STATIC_ASSERT(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
56   STATIC_ASSERT(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
57   STATIC_ASSERT(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
58   STATIC_ASSERT(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
59   STATIC_ASSERT(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
60   assert(func >= GL_NEVER);
61   assert(func <= GL_ALWAYS);
62   return func - GL_NEVER;
63}
64
65
66/**
67 * Convert GLenum stencil op tokens to pipe tokens.
68 */
69static GLuint
70gl_stencil_op_to_pipe(GLenum func)
71{
72   switch (func) {
73   case GL_KEEP:
74      return PIPE_STENCIL_OP_KEEP;
75   case GL_ZERO:
76      return PIPE_STENCIL_OP_ZERO;
77   case GL_REPLACE:
78      return PIPE_STENCIL_OP_REPLACE;
79   case GL_INCR:
80      return PIPE_STENCIL_OP_INCR;
81   case GL_DECR:
82      return PIPE_STENCIL_OP_DECR;
83   case GL_INCR_WRAP:
84      return PIPE_STENCIL_OP_INCR_WRAP;
85   case GL_DECR_WRAP:
86      return PIPE_STENCIL_OP_DECR_WRAP;
87   case GL_INVERT:
88      return PIPE_STENCIL_OP_INVERT;
89   default:
90      assert("invalid GL token in gl_stencil_op_to_pipe()" == NULL);
91      return 0;
92   }
93}
94
95static void
96update_depth_stencil_alpha(struct st_context *st)
97{
98   struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;
99   struct pipe_stencil_ref sr;
100   struct gl_context *ctx = st->ctx;
101
102   memset(dsa, 0, sizeof(*dsa));
103   memset(&sr, 0, sizeof(sr));
104
105   if (ctx->Depth.Test && ctx->DrawBuffer->Visual.depthBits > 0) {
106      dsa->depth.enabled = 1;
107      dsa->depth.writemask = ctx->Depth.Mask;
108      dsa->depth.func = st_compare_func_to_pipe(ctx->Depth.Func);
109   }
110
111   if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) {
112      dsa->stencil[0].enabled = 1;
113      dsa->stencil[0].func = st_compare_func_to_pipe(ctx->Stencil.Function[0]);
114      dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[0]);
115      dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[0]);
116      dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[0]);
117      dsa->stencil[0].valuemask = ctx->Stencil.ValueMask[0] & 0xff;
118      dsa->stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
119      sr.ref_value[0] = ctx->Stencil.Ref[0] & 0xff;
120
121      if (ctx->Stencil._TestTwoSide) {
122         const GLuint back = ctx->Stencil._BackFace;
123         dsa->stencil[1].enabled = 1;
124         dsa->stencil[1].func = st_compare_func_to_pipe(ctx->Stencil.Function[back]);
125         dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[back]);
126         dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[back]);
127         dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[back]);
128         dsa->stencil[1].valuemask = ctx->Stencil.ValueMask[back] & 0xff;
129         dsa->stencil[1].writemask = ctx->Stencil.WriteMask[back] & 0xff;
130         sr.ref_value[1] = ctx->Stencil.Ref[back] & 0xff;
131      }
132      else {
133         /* This should be unnecessary. Drivers must not expect this to
134          * contain valid data, except the enabled bit
135          */
136         dsa->stencil[1] = dsa->stencil[0];
137         dsa->stencil[1].enabled = 0;
138         sr.ref_value[1] = sr.ref_value[0];
139      }
140   }
141
142   if (ctx->Color.AlphaEnabled) {
143      dsa->alpha.enabled = 1;
144      dsa->alpha.func = st_compare_func_to_pipe(ctx->Color.AlphaFunc);
145      dsa->alpha.ref_value = ctx->Color.AlphaRefUnclamped;
146   }
147
148   cso_set_depth_stencil_alpha(st->cso_context, dsa);
149   cso_set_stencil_ref(st->cso_context, &sr);
150}
151
152
153const struct st_tracked_state st_update_depth_stencil_alpha = {
154   "st_update_depth_stencil",				/* name */
155   {							/* dirty */
156      (_NEW_DEPTH|_NEW_STENCIL|_NEW_COLOR),		/* mesa */
157      0,						/* st */
158   },
159   update_depth_stencil_alpha				/* update */
160};
161