src/gallium/drivers/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 "pipe/p_util.h"
  29 #include "pipe/p_shader_tokens.h"
  30 #include "draw/draw_context.h"
  31 #include "draw/draw_vertex.h"
  32 #include "draw/draw_private.h"
  33 #include "sp_context.h"
  34 #include "sp_state.h"
  35
  36
  37 /**
  38  * Search vertex program's outputs to find a match for the given
  39  * semantic name/index.  Return the index of the output slot.
  40  *
  41  * Return 0 if not found.  This will cause the fragment program to use
  42  * vertex attrib 0 (position) in the cases where the fragment program
  43  * attempts to use a missing vertex program output.  This is an undefined
  44  * condition that users shouldn't hit anyway.
  45  */
  46 static int
  47 find_vs_output(const struct pipe_shader_state *vs,
  48                uint semantic_name,
  49                uint semantic_index)
  50 {
  51    uint i;
  52    for (i = 0; i < vs->num_outputs; i++) {
  53       if (vs->output_semantic_name[i] == semantic_name &&
  54           vs->output_semantic_index[i] == semantic_index)
  55          return i;
  56    }
  57    return 0;
  58 }
  59
  60
  61 /**
  62  * Mark the current vertex layout as "invalid".
  63  * We'll validate the vertex layout later, when we start to actually
  64  * render a point or line or tri.
  65  */
  66 static void
  67 invalidate_vertex_layout(struct softpipe_context *softpipe)
  68 {
  69    softpipe->vertex_info.num_attribs =  0;
  70 }
  71
  72
  73 /**
  74  * The vertex info describes how to convert the post-transformed vertices
  75  * (simple float[][4]) used by the 'draw' module into vertices for
  76  * rasterization.
  77  *
  78  * This function validates the vertex layout and returns a pointer to a
  79  * vertex_info object.
  80  */
  81 struct vertex_info *
  82 softpipe_get_vertex_info(struct softpipe_context *softpipe)
  83 {
  84    struct vertex_info *vinfo = &softpipe->vertex_info;
  85
  86    if (vinfo->num_attribs == 0) {
  87       /* compute vertex layout now */
  88       const struct pipe_shader_state *vs = &softpipe->vs->shader;
  89       const struct pipe_shader_state *fs = &softpipe->fs->shader;
  90       const enum interp_mode colorInterp
  91          = softpipe->rasterizer->flatshade ? INTERP_CONSTANT : INTERP_LINEAR;
  92       uint i;
  93
  94       if (softpipe->vbuf) {
  95          /* if using the post-transform vertex buffer, tell draw_vbuf to
  96           * simply emit the whole post-xform vertex as-is:
  97           */
  98          struct vertex_info *vinfo_vbuf = &softpipe->vertex_info_vbuf;
  99          vinfo_vbuf->num_attribs = 0;
 100          draw_emit_vertex_attr(vinfo_vbuf, EMIT_ALL, INTERP_NONE, 0);
 101          vinfo_vbuf->size = 4 * vs->num_outputs
 102                           + sizeof(struct vertex_header) / 4;
 103       }
 104
 105       /*
 106        * Loop over fragment shader inputs, searching for the matching output
 107        * from the vertex shader.
 108        */
 109       vinfo->num_attribs = 0;
 110       for (i = 0; i < fs->num_inputs; i++) {
 111          int src;
 112          switch (fs->input_semantic_name[i]) {
 113          case TGSI_SEMANTIC_POSITION:
 114             src = find_vs_output(vs, TGSI_SEMANTIC_POSITION, 0);
 115             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_POS, src);
 116             break;
 117
 118          case TGSI_SEMANTIC_COLOR:
 119             src = find_vs_output(vs, TGSI_SEMANTIC_COLOR,
 120                                  fs->input_semantic_index[i]);
 121             draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
 122             break;
 123
 124          case TGSI_SEMANTIC_FOG:
 125             src = find_vs_output(vs, TGSI_SEMANTIC_FOG, 0);
 126             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 127             break;
 128
 129          case TGSI_SEMANTIC_GENERIC:
 130             /* this includes texcoords and varying vars */
 131             src = find_vs_output(vs, TGSI_SEMANTIC_GENERIC,
 132                                  fs->input_semantic_index[i]);
 133             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 134             break;
 135
 136          default:
 137             assert(0);
 138          }
 139       }
 140
 141       softpipe->psize_slot = find_vs_output(vs, TGSI_SEMANTIC_PSIZE, 0);
 142       if (softpipe->psize_slot > 0) {
 143          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 144                                softpipe->psize_slot);
 145       }
 146
 147       draw_compute_vertex_size(vinfo);
 148    }
 149
 150    return vinfo;
 151 }
 152
 153
 154 /**
 155  * Called from vbuf module.
 156  *
 157  * Note that there's actually two different vertex layouts in softpipe.
 158  *
 159  * The normal one is computed in softpipe_get_vertex_info() above and is
 160  * used by the point/line/tri "setup" code.
 161  *
 162  * The other one (this one) is only used by the vbuf module (which is
 163  * not normally used by default but used in testing).  For the vbuf module,
 164  * we basically want to pass-through the draw module's vertex layout as-is.
 165  * When the softpipe vbuf code begins drawing, the normal vertex layout
 166  * will come into play again.
 167  */
 168 struct vertex_info *
 169 softpipe_get_vbuf_vertex_info(struct softpipe_context *softpipe)
 170 {
 171    (void) softpipe_get_vertex_info(softpipe);
 172    return &softpipe->vertex_info_vbuf;
 173 }
 174
 175
 176 /**
 177  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 178  */
 179 static void
 180 compute_cliprect(struct softpipe_context *sp)
 181 {
 182    unsigned surfWidth, surfHeight;
 183
 184    if (sp->framebuffer.num_cbufs > 0) {
 185       surfWidth = sp->framebuffer.cbufs[0]->width;
 186       surfHeight = sp->framebuffer.cbufs[0]->height;
 187    }
 188    else {
 189       /* no surface? */
 190       surfWidth = sp->scissor.maxx;
 191       surfHeight = sp->scissor.maxy;
 192    }
 193
 194    if (sp->rasterizer->scissor) {
 195       /* clip to scissor rect */
 196       sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
 197       sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
 198       sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
 199       sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
 200    }
 201    else {
 202       /* clip to surface bounds */
 203       sp->cliprect.minx = 0;
 204       sp->cliprect.miny = 0;
 205       sp->cliprect.maxx = surfWidth;
 206       sp->cliprect.maxy = surfHeight;
 207    }
 208 }
 209
 210
 211 /* Hopefully this will remain quite simple, otherwise need to pull in
 212  * something like the state tracker mechanism.
 213  */
 214 void softpipe_update_derived( struct softpipe_context *softpipe )
 215 {
 216    if (softpipe->dirty & (SP_NEW_RASTERIZER |
 217                           SP_NEW_FS |
 218                           SP_NEW_VS))
 219       invalidate_vertex_layout( softpipe );
 220
 221    if (softpipe->dirty & (SP_NEW_SCISSOR |
 222                           SP_NEW_DEPTH_STENCIL_ALPHA |
 223                           SP_NEW_FRAMEBUFFER))
 224       compute_cliprect(softpipe);
 225
 226    if (softpipe->dirty & (SP_NEW_BLEND |
 227                           SP_NEW_DEPTH_STENCIL_ALPHA |
 228                           SP_NEW_FRAMEBUFFER |
 229                           SP_NEW_RASTERIZER |
 230                           SP_NEW_FS |
 231                           SP_NEW_QUERY))
 232       sp_build_quad_pipeline(softpipe);
 233
 234    softpipe->dirty = 0;
 235 }