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      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 (at) 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  */
     48 GLuint
     49 st_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  */
     69 static GLuint
     70 gl_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 
     95 static void
     96 update_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 
    153 const 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