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    VF_ATTRIB_VAR0,
  64    VF_ATTRIB_VAR1,
  65    VF_ATTRIB_VAR2,
  66    VF_ATTRIB_VAR3,
  67    VF_ATTRIB_VAR4,
  68    VF_ATTRIB_VAR5,
  69    VF_ATTRIB_VAR6,
  70    VF_ATTRIB_VAR7,
  71 };
  72
  73
  74 /**
  75  * Determine which post-transform / pre-rasterization vertex attributes
  76  * we need.
  77  * Derived from:  fs, setup states.
  78  */
  79 static void calculate_vertex_layout( struct softpipe_context *softpipe )
  80 {
  81    const GLbitfield inputsRead = softpipe->fs.inputs_read;
  82    GLuint slot_to_vf_attr[VF_ATTRIB_MAX];
  83    GLbitfield attr_mask = 0x0;
  84    GLuint i;
  85
  86    /* Need Z if depth test is enabled or the fragment program uses the
  87     * fragment position (XYZW).
  88     */
  89    if (softpipe->depth_test.enabled ||
  90        (inputsRead & FRAG_ATTRIB_WPOS))
  91       softpipe->need_z = GL_TRUE;
  92    else
  93       softpipe->need_z = GL_FALSE;
  94
  95    /* Need W if we do any perspective-corrected interpolation or the
  96     * fragment program uses the fragment position.
  97     */
  98    if (inputsRead & FRAG_ATTRIB_WPOS)
  99       softpipe->need_w = GL_TRUE;
 100    else
 101       softpipe->need_w = GL_FALSE;
 102
 103
 104    softpipe->nr_attrs = 0;
 105    memset(slot_to_vf_attr, 0, sizeof(slot_to_vf_attr));
 106
 107    memset(softpipe->fp_attr_to_slot, 0, sizeof(softpipe->fp_attr_to_slot));
 108    memset(softpipe->vf_attr_to_slot, 0, sizeof(softpipe->vf_attr_to_slot));
 109
 110    /* TODO - Figure out if we need to do perspective divide, etc.
 111     */
 112    EMIT_ATTR(VF_ATTRIB_POS, FRAG_ATTRIB_WPOS, INTERP_LINEAR);
 113
 114    /* Pull in the rest of the attributes.  They are all in float4
 115     * format.  Future optimizations could be to keep some attributes
 116     * as fixed point or ubyte format.
 117     */
 118    for (i = 1; i < FRAG_ATTRIB_TEX0; i++) {
 119       if (inputsRead & (1 << i)) {
 120          assert(i < sizeof(frag_to_vf) / sizeof(frag_to_vf[0]));
 121          if (softpipe->setup.flatshade
 122              && (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1))
 123             EMIT_ATTR(frag_to_vf[i], i, INTERP_CONSTANT);
 124          else
 125             EMIT_ATTR(frag_to_vf[i], i, INTERP_LINEAR);
 126       }
 127    }
 128
 129    for (i = FRAG_ATTRIB_TEX0; i < FRAG_ATTRIB_MAX; i++) {
 130       if (inputsRead & (1 << i)) {
 131          assert(i < sizeof(frag_to_vf) / sizeof(frag_to_vf[0]));
 132          EMIT_ATTR(frag_to_vf[i], i, INTERP_PERSPECTIVE);
 133          softpipe->need_w = GL_TRUE;
 134       }
 135    }
 136
 137    softpipe->nr_frag_attrs = softpipe->nr_attrs;
 138
 139    /* Additional attributes required for setup: Just twosided
 140     * lighting.  Edgeflag is dealt with specially by setting bits in
 141     * the vertex header.
 142     */
 143    if (softpipe->setup.light_twoside) {
 144       if (inputsRead & FRAG_BIT_COL0) {
 145          EMIT_ATTR(VF_ATTRIB_BFC0, FRAG_ATTRIB_MAX, 0); /* XXX: mark as discarded after setup */
 146       }
 147
 148       if (inputsRead & FRAG_BIT_COL1) {
 149          EMIT_ATTR(VF_ATTRIB_BFC1, FRAG_ATTRIB_MAX, 0); /* XXX: discard after setup */
 150       }
 151    }
 152
 153    /* If the attributes have changed, tell the draw module (which in turn
 154     * tells the vf module) about the new vertex layout.
 155     */
 156    if (attr_mask != softpipe->attr_mask) {
 157       softpipe->attr_mask = attr_mask;
 158
 159       draw_set_vertex_attributes( softpipe->draw,
 160                                   slot_to_vf_attr,
 161                                   softpipe->nr_attrs );
 162    }
 163 }
 164
 165
 166 /**
 167  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 168  */
 169 static void
 170 compute_cliprect(struct softpipe_context *sp)
 171 {
 172    GLint surfWidth, surfHeight;
 173
 174    if (sp->framebuffer.num_cbufs > 0) {
 175       surfWidth = sp->framebuffer.cbufs[0]->width;
 176       surfHeight = sp->framebuffer.cbufs[0]->height;
 177    }
 178    else {
 179       /* no surface? */
 180       surfWidth = sp->scissor.maxx;
 181       surfHeight = sp->scissor.maxy;
 182    }
 183
 184    if (sp->setup.scissor) {
 185       /* clip to scissor rect */
 186       sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
 187       sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
 188       sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
 189       sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
 190    }
 191    else {
 192       /* clip to surface bounds */
 193       sp->cliprect.minx = 0;
 194       sp->cliprect.miny = 0;
 195       sp->cliprect.maxx = surfWidth;
 196       sp->cliprect.maxy = surfHeight;
 197    }
 198 }
 199
 200
 201 /* Hopefully this will remain quite simple, otherwise need to pull in
 202  * something like the state tracker mechanism.
 203  */
 204 void softpipe_update_derived( struct softpipe_context *softpipe )
 205 {
 206    if (softpipe->dirty & (SP_NEW_SETUP | SP_NEW_FS))
 207       calculate_vertex_layout( softpipe );
 208
 209    if (softpipe->dirty & (SP_NEW_SCISSOR |
 210                           SP_NEW_STENCIL |
 211                           SP_NEW_FRAMEBUFFER))
 212       compute_cliprect(softpipe);
 213
 214    if (softpipe->dirty & (SP_NEW_BLEND |
 215                           SP_NEW_DEPTH_TEST |
 216                           SP_NEW_ALPHA_TEST |
 217                           SP_NEW_FRAMEBUFFER |
 218                           SP_NEW_STENCIL |
 219                           SP_NEW_SETUP |
 220                           SP_NEW_FS))
 221       sp_build_quad_pipeline(softpipe);
 222
 223    softpipe->dirty = 0;
 224 }