src/mesa/state_tracker/st_atom_depth.c

   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
  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
  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
  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 &&
 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 }