src/mesa/state_tracker/st_atom_depth.c

   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 "st_context.h"
  37 #include "st_atom.h"
  38 #include "pipe/p_context.h"
  39 #include "pipe/p_defines.h"
  40 #include "cso_cache/cso_context.h"
  41
  42
  43 /**
  44  * Convert an OpenGL compare mode to a pipe tokens.
  45  */
  46 GLuint
  47 st_compare_func_to_pipe(GLenum func)
  48 {
  49    /* Same values, just biased */
  50    assert(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
  51    assert(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
  52    assert(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
  53    assert(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
  54    assert(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
  55    assert(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
  56    assert(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
  57    assert(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
  58    assert(func >= GL_NEVER);
  59    assert(func <= GL_ALWAYS);
  60    return func - GL_NEVER;
  61 }
  62
  63
  64 /**
  65  * Convert GLenum stencil op tokens to pipe tokens.
  66  */
  67 static GLuint
  68 gl_stencil_op_to_pipe(GLenum func)
  69 {
  70    switch (func) {
  71    case GL_KEEP:
  72       return PIPE_STENCIL_OP_KEEP;
  73    case GL_ZERO:
  74       return PIPE_STENCIL_OP_ZERO;
  75    case GL_REPLACE:
  76       return PIPE_STENCIL_OP_REPLACE;
  77    case GL_INCR:
  78       return PIPE_STENCIL_OP_INCR;
  79    case GL_DECR:
  80       return PIPE_STENCIL_OP_DECR;
  81    case GL_INCR_WRAP:
  82       return PIPE_STENCIL_OP_INCR_WRAP;
  83    case GL_DECR_WRAP:
  84       return PIPE_STENCIL_OP_DECR_WRAP;
  85    case GL_INVERT:
  86       return PIPE_STENCIL_OP_INVERT;
  87    default:
  88       assert("invalid GL token in gl_stencil_op_to_pipe()" == NULL);
  89       return 0;
  90    }
  91 }
  92
  93 static void
  94 update_depth_stencil_alpha(struct st_context *st)
  95 {
  96    struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;
  97    struct pipe_stencil_ref sr;
  98    GLcontext *ctx = st->ctx;
  99
 100    memset(dsa, 0, sizeof(*dsa));
 101    memset(&sr, 0, sizeof(sr));
 102
 103    if (ctx->Depth.Test && ctx->DrawBuffer->Visual.depthBits > 0) {
 104       dsa->depth.enabled = 1;
 105       dsa->depth.writemask = ctx->Depth.Mask;
 106       dsa->depth.func = st_compare_func_to_pipe(ctx->Depth.Func);
 107    }
 108
 109    if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) {
 110       dsa->stencil[0].enabled = 1;
 111       dsa->stencil[0].func = st_compare_func_to_pipe(ctx->Stencil.Function[0]);
 112       dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[0]);
 113       dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[0]);
 114       dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[0]);
 115       dsa->stencil[0].valuemask = ctx->Stencil.ValueMask[0] & 0xff;
 116       dsa->stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
 117       sr.ref_value[0] = ctx->Stencil.Ref[0] & 0xff;
 118
 119       if (ctx->Stencil._TestTwoSide) {
 120          const GLuint back = ctx->Stencil._BackFace;
 121          dsa->stencil[1].enabled = 1;
 122          dsa->stencil[1].func = st_compare_func_to_pipe(ctx->Stencil.Function[back]);
 123          dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[back]);
 124          dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[back]);
 125          dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[back]);
 126          dsa->stencil[1].valuemask = ctx->Stencil.ValueMask[back] & 0xff;
 127          dsa->stencil[1].writemask = ctx->Stencil.WriteMask[back] & 0xff;
 128          sr.ref_value[1] = ctx->Stencil.Ref[back] & 0xff;
 129       }
 130       else {
 131          /* This should be unnecessary. Drivers must not expect this to
 132           * contain valid data, except the enabled bit
 133           */
 134          dsa->stencil[1] = dsa->stencil[0];
 135          dsa->stencil[1].enabled = 0;
 136          sr.ref_value[1] = sr.ref_value[0];
 137       }
 138    }
 139
 140    if (ctx->Color.AlphaEnabled) {
 141       dsa->alpha.enabled = 1;
 142       dsa->alpha.func = st_compare_func_to_pipe(ctx->Color.AlphaFunc);
 143       dsa->alpha.ref_value = ctx->Color.AlphaRef;
 144    }
 145
 146    cso_set_depth_stencil_alpha(st->cso_context, dsa);
 147    cso_set_stencil_ref(st->cso_context, &sr);
 148 }
 149
 150
 151 const struct st_tracked_state st_update_depth_stencil_alpha = {
 152    "st_update_depth_stencil",                           /* name */
 153    {                                                    /* dirty */
 154       (_NEW_DEPTH|_NEW_STENCIL|_NEW_COLOR),             /* mesa */
 155       0,                                                /* st */
 156    },
 157    update_depth_stencil_alpha                           /* update */
 158 };