src/mesa/pipe/softpipe/sp_state_derived.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 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 #include "main/glheader.h"
  29 #include "main/macros.h"
  30 #include "main/enums.h"
  31
  32 #include "vf/vf.h"
  33 #include "pipe/draw/draw_context.h"
  34 #include "sp_context.h"
  35 #include "sp_state.h"
  36
  37
  38 #define EMIT_ATTR( VF_ATTR, FRAG_ATTR, INTERP )                 \
  39 do {                                                            \
  40    slot_to_vf_attr[softpipe->nr_attrs] = VF_ATTR;               \
  41    softpipe->vf_attr_to_slot[VF_ATTR] = softpipe->nr_attrs;     \
  42    softpipe->fp_attr_to_slot[FRAG_ATTR] = softpipe->nr_attrs;   \
  43    softpipe->interp[softpipe->nr_attrs] = INTERP;               \
  44    softpipe->nr_attrs++;                                        \
  45    attr_mask |= (1 << (VF_ATTR));                               \
  46 } while (0)
  47
  48
  49 static const GLuint frag_to_vf[FRAG_ATTRIB_MAX] =
  50 {
  51    VF_ATTRIB_POS,
  52    VF_ATTRIB_COLOR0,
  53    VF_ATTRIB_COLOR1,
  54    VF_ATTRIB_FOG,
  55    VF_ATTRIB_TEX0,
  56    VF_ATTRIB_TEX1,
  57    VF_ATTRIB_TEX2,
  58    VF_ATTRIB_TEX3,
  59    VF_ATTRIB_TEX4,
  60    VF_ATTRIB_TEX5,
  61    VF_ATTRIB_TEX6,
  62    VF_ATTRIB_TEX7,
  63 };
  64
  65
  66 /**
  67  * Determine which post-transform / pre-rasterization vertex attributes
  68  * we need.
  69  * Derived from:  fs, setup states.
  70  */
  71 static void calculate_vertex_layout( struct softpipe_context *softpipe )
  72 {
  73    const GLbitfield inputsRead = softpipe->fs.inputs_read;
  74    GLuint slot_to_vf_attr[VF_ATTRIB_MAX];
  75    GLbitfield attr_mask = 0x0;
  76    GLuint i;
  77
  78    /* Need Z if depth test is enabled or the fragment program uses the
  79     * fragment position (XYZW).
  80     */
  81    if (softpipe->depth_test.enabled ||
  82        (inputsRead & FRAG_ATTRIB_WPOS))
  83       softpipe->need_z = GL_TRUE;
  84    else
  85       softpipe->need_z = GL_FALSE;
  86
  87    /* Need W if we do any perspective-corrected interpolation or the
  88     * fragment program uses the fragment position.
  89     */
  90    if (inputsRead & FRAG_ATTRIB_WPOS)
  91       softpipe->need_w = GL_TRUE;
  92    else
  93       softpipe->need_w = GL_FALSE;
  94
  95
  96    softpipe->nr_attrs = 0;
  97    memset(slot_to_vf_attr, 0, sizeof(slot_to_vf_attr));
  98
  99    memset(softpipe->fp_attr_to_slot, 0, sizeof(softpipe->fp_attr_to_slot));
 100    memset(softpipe->vf_attr_to_slot, 0, sizeof(softpipe->vf_attr_to_slot));
 101
 102    /* TODO - Figure out if we need to do perspective divide, etc.
 103     */
 104    EMIT_ATTR(VF_ATTRIB_POS, FRAG_ATTRIB_WPOS, INTERP_LINEAR);
 105
 106    /* Pull in the rest of the attributes.  They are all in float4
 107     * format.  Future optimizations could be to keep some attributes
 108     * as fixed point or ubyte format.
 109     */
 110    for (i = 1; i < FRAG_ATTRIB_TEX0; i++) {
 111       if (inputsRead & (1 << i)) {
 112          if (softpipe->setup.flatshade
 113              && (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1))
 114             EMIT_ATTR(frag_to_vf[i], i, INTERP_CONSTANT);
 115          else
 116             EMIT_ATTR(frag_to_vf[i], i, INTERP_LINEAR);
 117       }
 118    }
 119
 120    for (i = FRAG_ATTRIB_TEX0; i < FRAG_ATTRIB_MAX; i++) {
 121       if (inputsRead & (1 << i)) {
 122          EMIT_ATTR(frag_to_vf[i], i, INTERP_PERSPECTIVE);
 123          softpipe->need_w = GL_TRUE;
 124       }
 125    }
 126
 127    softpipe->nr_frag_attrs = softpipe->nr_attrs;
 128
 129    /* Additional attributes required for setup: Just twosided
 130     * lighting.  Edgeflag is dealt with specially by setting bits in
 131     * the vertex header.
 132     */
 133    if (softpipe->setup.light_twoside) {
 134       if (inputsRead & FRAG_BIT_COL0) {
 135          EMIT_ATTR(VF_ATTRIB_BFC0, FRAG_ATTRIB_MAX, 0); /* XXX: mark as discarded after setup */
 136       }
 137
 138       if (inputsRead & FRAG_BIT_COL1) {
 139          EMIT_ATTR(VF_ATTRIB_BFC1, FRAG_ATTRIB_MAX, 0); /* XXX: discard after setup */
 140       }
 141    }
 142
 143    /* If the attributes have changed, tell the draw module (which in turn
 144     * tells the vf module) about the new vertex layout.
 145     */
 146    if (attr_mask != softpipe->attr_mask) {
 147       softpipe->attr_mask = attr_mask;
 148
 149       draw_set_vertex_attributes( softpipe->draw,
 150                                   slot_to_vf_attr,
 151                                   softpipe->nr_attrs );
 152    }
 153 }
 154
 155
 156 /* Hopefully this will remain quite simple, otherwise need to pull in
 157  * something like the state tracker mechanism.
 158  */
 159 void softpipe_update_derived( struct softpipe_context *softpipe )
 160 {
 161    if (softpipe->dirty & (SP_NEW_SETUP | SP_NEW_FS))
 162       calculate_vertex_layout( softpipe );
 163
 164    if (softpipe->dirty & (SP_NEW_BLEND |
 165                           SP_NEW_DEPTH_TEST |
 166                           SP_NEW_ALPHA_TEST |
 167                           SP_NEW_FRAMEBUFFER |
 168                           SP_NEW_STENCIL |
 169                           SP_NEW_SETUP |
 170                           SP_NEW_FS))
 171       sp_build_quad_pipeline(softpipe);
 172
 173    softpipe->dirty = 0;
 174 }