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(struct softpipe_context *sp,
  48                const struct pipe_shader_state *vs,
  49                uint semantic_name,
  50                uint semantic_index)
  51 {
  52    uint i;
  53    for (i = 0; i < vs->num_outputs; i++) {
  54       if (vs->output_semantic_name[i] == semantic_name &&
  55           vs->output_semantic_index[i] == semantic_index)
  56          return i;
  57    }
  58
  59    /* See if the draw module is introducing a new attribute... */
  60    return draw_find_vs_output(sp->draw, semantic_name, semantic_index);
  61 }
  62
  63
  64 /**
  65  * Mark the current vertex layout as "invalid".
  66  * We'll validate the vertex layout later, when we start to actually
  67  * render a point or line or tri.
  68  */
  69 static void
  70 invalidate_vertex_layout(struct softpipe_context *softpipe)
  71 {
  72    softpipe->vertex_info.num_attribs =  0;
  73 }
  74
  75
  76 /**
  77  * The vertex info describes how to convert the post-transformed vertices
  78  * (simple float[][4]) used by the 'draw' module into vertices for
  79  * rasterization.
  80  *
  81  * This function validates the vertex layout and returns a pointer to a
  82  * vertex_info object.
  83  */
  84 struct vertex_info *
  85 softpipe_get_vertex_info(struct softpipe_context *softpipe)
  86 {
  87    struct vertex_info *vinfo = &softpipe->vertex_info;
  88
  89    if (vinfo->num_attribs == 0) {
  90       /* compute vertex layout now */
  91       const struct pipe_shader_state *vs = &softpipe->vs->shader;
  92       const struct pipe_shader_state *fs = &softpipe->fs->shader;
  93       const enum interp_mode colorInterp
  94          = softpipe->rasterizer->flatshade ? INTERP_CONSTANT : INTERP_LINEAR;
  95       uint i;
  96
  97       if (softpipe->vbuf) {
  98          /* if using the post-transform vertex buffer, tell draw_vbuf to
  99           * simply emit the whole post-xform vertex as-is:
 100           */
 101          struct vertex_info *vinfo_vbuf = &softpipe->vertex_info_vbuf;
 102          vinfo_vbuf->num_attribs = 0;
 103          draw_emit_vertex_attr(vinfo_vbuf, EMIT_ALL, INTERP_NONE, 0);
 104          vinfo_vbuf->size = 4 * vs->num_outputs
 105                           + sizeof(struct vertex_header) / 4;
 106       }
 107
 108       /*
 109        * Loop over fragment shader inputs, searching for the matching output
 110        * from the vertex shader.
 111        */
 112       vinfo->num_attribs = 0;
 113       for (i = 0; i < fs->num_inputs; i++) {
 114          int src;
 115          switch (fs->input_semantic_name[i]) {
 116          case TGSI_SEMANTIC_POSITION:
 117             src = find_vs_output(softpipe, vs, TGSI_SEMANTIC_POSITION, 0);
 118             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_POS, src);
 119             break;
 120
 121          case TGSI_SEMANTIC_COLOR:
 122             src = find_vs_output(softpipe, vs, TGSI_SEMANTIC_COLOR,
 123                                  fs->input_semantic_index[i]);
 124             draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
 125             break;
 126
 127          case TGSI_SEMANTIC_FOG:
 128             src = find_vs_output(softpipe, vs, TGSI_SEMANTIC_FOG, 0);
 129             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 130             break;
 131
 132          case TGSI_SEMANTIC_GENERIC:
 133             /* this includes texcoords and varying vars */
 134             src = find_vs_output(softpipe, vs, TGSI_SEMANTIC_GENERIC,
 135                                  fs->input_semantic_index[i]);
 136             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 137             break;
 138
 139          default:
 140             assert(0);
 141          }
 142       }
 143
 144       softpipe->psize_slot = find_vs_output(softpipe, vs, TGSI_SEMANTIC_PSIZE, 0);
 145       if (softpipe->psize_slot > 0) {
 146          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 147                                softpipe->psize_slot);
 148       }
 149
 150       draw_compute_vertex_size(vinfo);
 151    }
 152
 153    return vinfo;
 154 }
 155
 156
 157 /**
 158  * Called from vbuf module.
 159  *
 160  * Note that there's actually two different vertex layouts in softpipe.
 161  *
 162  * The normal one is computed in softpipe_get_vertex_info() above and is
 163  * used by the point/line/tri "setup" code.
 164  *
 165  * The other one (this one) is only used by the vbuf module (which is
 166  * not normally used by default but used in testing).  For the vbuf module,
 167  * we basically want to pass-through the draw module's vertex layout as-is.
 168  * When the softpipe vbuf code begins drawing, the normal vertex layout
 169  * will come into play again.
 170  */
 171 struct vertex_info *
 172 softpipe_get_vbuf_vertex_info(struct softpipe_context *softpipe)
 173 {
 174    (void) softpipe_get_vertex_info(softpipe);
 175    return &softpipe->vertex_info_vbuf;
 176 }
 177
 178
 179 /**
 180  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 181  */
 182 static void
 183 compute_cliprect(struct softpipe_context *sp)
 184 {
 185    unsigned surfWidth, surfHeight;
 186
 187    if (sp->framebuffer.num_cbufs > 0) {
 188       surfWidth = sp->framebuffer.cbufs[0]->width;
 189       surfHeight = sp->framebuffer.cbufs[0]->height;
 190    }
 191    else {
 192       /* no surface? */
 193       surfWidth = sp->scissor.maxx;
 194       surfHeight = sp->scissor.maxy;
 195    }
 196
 197    if (sp->rasterizer->scissor) {
 198       /* clip to scissor rect */
 199       sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
 200       sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
 201       sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
 202       sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
 203    }
 204    else {
 205       /* clip to surface bounds */
 206       sp->cliprect.minx = 0;
 207       sp->cliprect.miny = 0;
 208       sp->cliprect.maxx = surfWidth;
 209       sp->cliprect.maxy = surfHeight;
 210    }
 211 }
 212
 213
 214 /* Hopefully this will remain quite simple, otherwise need to pull in
 215  * something like the state tracker mechanism.
 216  */
 217 void softpipe_update_derived( struct softpipe_context *softpipe )
 218 {
 219    if (softpipe->dirty & (SP_NEW_RASTERIZER |
 220                           SP_NEW_FS |
 221                           SP_NEW_VS))
 222       invalidate_vertex_layout( softpipe );
 223
 224    if (softpipe->dirty & (SP_NEW_SCISSOR |
 225                           SP_NEW_DEPTH_STENCIL_ALPHA |
 226                           SP_NEW_FRAMEBUFFER))
 227       compute_cliprect(softpipe);
 228
 229    if (softpipe->dirty & (SP_NEW_BLEND |
 230                           SP_NEW_DEPTH_STENCIL_ALPHA |
 231                           SP_NEW_FRAMEBUFFER |
 232                           SP_NEW_RASTERIZER |
 233                           SP_NEW_FS |
 234                           SP_NEW_QUERY))
 235       sp_build_quad_pipeline(softpipe);
 236
 237    softpipe->dirty = 0;
 238 }