src/mesa/drivers/dri/i965/brw_gs.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32 #include "main/glheader.h"
  33 #include "main/macros.h"
  34 #include "main/enums.h"
  35
  36 #include "intel_batchbuffer.h"
  37
  38 #include "brw_defines.h"
  39 #include "brw_context.h"
  40 #include "brw_eu.h"
  41 #include "brw_util.h"
  42 #include "brw_state.h"
  43 #include "brw_gs.h"
  44
  45 #include "../glsl/ralloc.h"
  46
  47 static void compile_gs_prog( struct brw_context *brw,
  48                              struct brw_gs_prog_key *key )
  49 {
  50    struct intel_context *intel = &brw->intel;
  51    struct brw_gs_compile c;
  52    const GLuint *program;
  53    void *mem_ctx;
  54    GLuint program_size;
  55
  56    /* Gen6: VF has already converted into polygon, and LINELOOP is
  57     * converted to LINESTRIP at the beginning of the 3D pipeline.
  58     */
  59    if (intel->gen >= 6)
  60       return;
  61
  62    memset(&c, 0, sizeof(c));
  63
  64    c.key = *key;
  65    /* Need to locate the two positions present in vertex + header.
  66     * These are currently hardcoded:
  67     */
  68    c.nr_attrs = brw_count_bits(c.key.attrs);
  69
  70    if (intel->gen >= 5)
  71        c.nr_regs = (c.nr_attrs + 1) / 2 + 3;  /* are vertices packed, or reg-aligned? */
  72    else
  73        c.nr_regs = (c.nr_attrs + 1) / 2 + 1;  /* are vertices packed, or reg-aligned? */
  74
  75    c.nr_bytes = c.nr_regs * REG_SIZE;
  76
  77    mem_ctx = NULL;
  78
  79    /* Begin the compilation:
  80     */
  81    brw_init_compile(brw, &c.func, mem_ctx);
  82
  83    c.func.single_program_flow = 1;
  84
  85    /* For some reason the thread is spawned with only 4 channels
  86     * unmasked.
  87     */
  88    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  89
  90
  91    /* Note that primitives which don't require a GS program have
  92     * already been weeded out by this stage:
  93     */
  94
  95    switch (key->primitive) {
  96    case GL_QUADS:
  97       brw_gs_quads( &c, key );
  98       break;
  99    case GL_QUAD_STRIP:
 100       brw_gs_quad_strip( &c, key );
 101       break;
 102    case GL_LINE_LOOP:
 103       brw_gs_lines( &c );
 104       break;
 105    default:
 106       ralloc_free(mem_ctx);
 107       return;
 108    }
 109
 110    /* get the program
 111     */
 112    program = brw_get_program(&c.func, &program_size);
 113
 114    if (unlikely(INTEL_DEBUG & DEBUG_GS)) {
 115       int i;
 116
 117       printf("gs:\n");
 118       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 119          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
 120                     intel->gen);
 121       printf("\n");
 122     }
 123
 124    brw_upload_cache(&brw->cache, BRW_GS_PROG,
 125                     &c.key, sizeof(c.key),
 126                     program, program_size,
 127                     &c.prog_data, sizeof(c.prog_data),
 128                     &brw->gs.prog_offset, &brw->gs.prog_data);
 129    ralloc_free(mem_ctx);
 130 }
 131
 132 static const GLenum gs_prim[GL_POLYGON+1] = {
 133    GL_POINTS,
 134    GL_LINES,
 135    GL_LINE_LOOP,
 136    GL_LINES,
 137    GL_TRIANGLES,
 138    GL_TRIANGLES,
 139    GL_TRIANGLES,
 140    GL_QUADS,
 141    GL_QUAD_STRIP,
 142    GL_TRIANGLES
 143 };
 144
 145 static void populate_key( struct brw_context *brw,
 146                           struct brw_gs_prog_key *key )
 147 {
 148    struct gl_context *ctx = &brw->intel.ctx;
 149    struct intel_context *intel = &brw->intel;
 150
 151    memset(key, 0, sizeof(*key));
 152
 153    /* CACHE_NEW_VS_PROG */
 154    key->attrs = brw->vs.prog_data->outputs_written;
 155
 156    /* BRW_NEW_PRIMITIVE */
 157    key->primitive = gs_prim[brw->primitive];
 158
 159    /* _NEW_LIGHT */
 160    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 161    if (key->primitive == GL_QUADS && ctx->Light.ShadeModel != GL_FLAT) {
 162       /* Provide consistent primitive order with brw_set_prim's
 163        * optimization of single quads to trifans.
 164        */
 165       key->pv_first = GL_TRUE;
 166    }
 167
 168    key->need_gs_prog = (intel->gen >= 6)
 169       ? 0
 170       : (brw->primitive == GL_QUADS ||
 171          brw->primitive == GL_QUAD_STRIP ||
 172          brw->primitive == GL_LINE_LOOP);
 173 }
 174
 175 /* Calculate interpolants for triangle and line rasterization.
 176  */
 177 static void prepare_gs_prog(struct brw_context *brw)
 178 {
 179    struct brw_gs_prog_key key;
 180    /* Populate the key:
 181     */
 182    populate_key(brw, &key);
 183
 184    if (brw->gs.prog_active != key.need_gs_prog) {
 185       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 186       brw->gs.prog_active = key.need_gs_prog;
 187    }
 188
 189    if (brw->gs.prog_active) {
 190       if (!brw_search_cache(&brw->cache, BRW_GS_PROG,
 191                             &key, sizeof(key),
 192                             &brw->gs.prog_offset, &brw->gs.prog_data)) {
 193          compile_gs_prog( brw, &key );
 194       }
 195    }
 196 }
 197
 198
 199 const struct brw_tracked_state brw_gs_prog = {
 200    .dirty = {
 201       .mesa  = _NEW_LIGHT,
 202       .brw   = BRW_NEW_PRIMITIVE,
 203       .cache = CACHE_NEW_VS_PROG
 204    },
 205    .prepare = prepare_gs_prog
 206 };