• Home
  • History
  • Annotate
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /**************************************************************************
2  *
3  * Copyright 2007 VMware, Inc.
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 VMWARE 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 <keithw@vmware.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 #include "main/stencil.h"
45 
46 
47 /**
48  * Convert an OpenGL compare mode to a pipe tokens.
49  */
50 GLuint
st_compare_func_to_pipe(GLenum func)51 st_compare_func_to_pipe(GLenum func)
52 {
53    /* Same values, just biased */
54    STATIC_ASSERT(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
55    STATIC_ASSERT(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
56    STATIC_ASSERT(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
57    STATIC_ASSERT(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
58    STATIC_ASSERT(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
59    STATIC_ASSERT(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
60    STATIC_ASSERT(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
61    STATIC_ASSERT(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
62    assert(func >= GL_NEVER);
63    assert(func <= GL_ALWAYS);
64    return func - GL_NEVER;
65 }
66 
67 
68 /**
69  * Convert GLenum stencil op tokens to pipe tokens.
70  */
71 static GLuint
gl_stencil_op_to_pipe(GLenum func)72 gl_stencil_op_to_pipe(GLenum func)
73 {
74    switch (func) {
75    case GL_KEEP:
76       return PIPE_STENCIL_OP_KEEP;
77    case GL_ZERO:
78       return PIPE_STENCIL_OP_ZERO;
79    case GL_REPLACE:
80       return PIPE_STENCIL_OP_REPLACE;
81    case GL_INCR:
82       return PIPE_STENCIL_OP_INCR;
83    case GL_DECR:
84       return PIPE_STENCIL_OP_DECR;
85    case GL_INCR_WRAP:
86       return PIPE_STENCIL_OP_INCR_WRAP;
87    case GL_DECR_WRAP:
88       return PIPE_STENCIL_OP_DECR_WRAP;
89    case GL_INVERT:
90       return PIPE_STENCIL_OP_INVERT;
91    default:
92       assert("invalid GL token in gl_stencil_op_to_pipe()" == NULL);
93       return 0;
94    }
95 }
96 
97 void
st_update_depth_stencil_alpha(struct st_context * st)98 st_update_depth_stencil_alpha(struct st_context *st)
99 {
100    struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;
101    struct pipe_stencil_ref sr;
102    struct gl_context *ctx = st->ctx;
103 
104    memset(dsa, 0, sizeof(*dsa));
105    memset(&sr, 0, sizeof(sr));
106 
107    if (ctx->DrawBuffer->Visual.depthBits > 0) {
108       if (ctx->Depth.Test) {
109          dsa->depth.enabled = 1;
110          dsa->depth.func = st_compare_func_to_pipe(ctx->Depth.Func);
111          if (dsa->depth.func != PIPE_FUNC_EQUAL)
112             dsa->depth.writemask = ctx->Depth.Mask;
113       }
114       if (ctx->Depth.BoundsTest) {
115          dsa->depth.bounds_test = 1;
116          dsa->depth.bounds_min = ctx->Depth.BoundsMin;
117          dsa->depth.bounds_max = ctx->Depth.BoundsMax;
118       }
119    }
120 
121    if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) {
122       dsa->stencil[0].enabled = 1;
123       dsa->stencil[0].func = st_compare_func_to_pipe(ctx->Stencil.Function[0]);
124       dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[0]);
125       dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[0]);
126       dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[0]);
127       dsa->stencil[0].valuemask = ctx->Stencil.ValueMask[0] & 0xff;
128       dsa->stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
129       sr.ref_value[0] = _mesa_get_stencil_ref(ctx, 0);
130 
131       if (_mesa_stencil_is_two_sided(ctx)) {
132          const GLuint back = ctx->Stencil._BackFace;
133          dsa->stencil[1].enabled = 1;
134          dsa->stencil[1].func = st_compare_func_to_pipe(ctx->Stencil.Function[back]);
135          dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[back]);
136          dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[back]);
137          dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[back]);
138          dsa->stencil[1].valuemask = ctx->Stencil.ValueMask[back] & 0xff;
139          dsa->stencil[1].writemask = ctx->Stencil.WriteMask[back] & 0xff;
140          sr.ref_value[1] = _mesa_get_stencil_ref(ctx, back);
141       }
142       else {
143          /* This should be unnecessary. Drivers must not expect this to
144           * contain valid data, except the enabled bit
145           */
146          dsa->stencil[1] = dsa->stencil[0];
147          dsa->stencil[1].enabled = 0;
148          sr.ref_value[1] = sr.ref_value[0];
149       }
150    }
151 
152    if (ctx->Color.AlphaEnabled && !st->lower_alpha_test &&
153        !(ctx->DrawBuffer->_IntegerBuffers & 0x1)) {
154       dsa->alpha.enabled = 1;
155       dsa->alpha.func = st_compare_func_to_pipe(ctx->Color.AlphaFunc);
156       dsa->alpha.ref_value = ctx->Color.AlphaRefUnclamped;
157    }
158 
159    cso_set_depth_stencil_alpha(st->cso_context, dsa);
160    cso_set_stencil_ref(st->cso_context, &sr);
161 }
162