src/mesa/drivers/dri/i830/i830_render.c

   1 /*
   2  * Intel i810 DRI driver for Mesa 3.5
   3  *
   4  * Copyright (C) 1999-2000  Keith Whitwell   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 "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19  * NONINFRINGEMENT.  IN NO EVENT SHALL KEITH WHITWELL BE LIABLE FOR
  20  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
  21  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Author:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  * Adapted for use on the I830:
  27  *    Jeff Hartmann <jhartmann@2d3d.com>
  28  */
  29 /* $XFree86: xc/lib/GL/mesa/src/drv/i830/i830_render.c,v 1.2 2002/12/10 01:26:53 dawes Exp $ */
  30
  31 /*
  32  * Render unclipped vertex buffers by emitting vertices directly to
  33  * dma buffers.  Use strip/fan hardware acceleration where possible.
  34  *
  35  */
  36 #include "glheader.h"
  37 #include "context.h"
  38 #include "macros.h"
  39 #include "imports.h"
  40 #include "mtypes.h"
  41 #include "enums.h"
  42
  43 #include "tnl/t_context.h"
  44
  45 #include "i830_screen.h"
  46 #include "i830_dri.h"
  47
  48 #include "i830_context.h"
  49 #include "i830_tris.h"
  50 #include "i830_state.h"
  51 #include "i830_vb.h"
  52 #include "i830_ioctl.h"
  53
  54 /*
  55  * Render unclipped vertex buffers by emitting vertices directly to
  56  * dma buffers.  Use strip/fan hardware primitives where possible.
  57  * Try to simulate missing primitives with indexed vertices.
  58  */
  59 #define HAVE_POINTS      0  /* Has it, but can't use because subpixel has to
  60                              * be adjusted for points on the I830/I845G
  61                              */
  62 #define HAVE_LINES       1
  63 #define HAVE_LINE_STRIPS 1
  64 #define HAVE_TRIANGLES   1
  65 #define HAVE_TRI_STRIPS  1
  66 #define HAVE_TRI_STRIP_1 0  /* has it, template can't use it yet */
  67 #define HAVE_TRI_FANS    1
  68 #define HAVE_POLYGONS    1
  69 #define HAVE_QUADS       0
  70 #define HAVE_QUAD_STRIPS 0
  71
  72 #define HAVE_ELTS        0
  73
  74 static GLuint hw_prim[GL_POLYGON+1] = {
  75    0,
  76    PRIM3D_LINELIST,
  77    PRIM3D_LINESTRIP,
  78    PRIM3D_LINESTRIP,
  79    PRIM3D_TRILIST,
  80    PRIM3D_TRISTRIP,
  81    PRIM3D_TRIFAN,
  82    0,
  83    0,
  84    PRIM3D_POLY
  85 };
  86
  87 static const GLenum reduced_prim[GL_POLYGON+1] = {
  88    GL_POINTS,
  89    GL_LINES,
  90    GL_LINES,
  91    GL_LINES,
  92    GL_TRIANGLES,
  93    GL_TRIANGLES,
  94    GL_TRIANGLES,
  95    GL_TRIANGLES,
  96    GL_TRIANGLES,
  97    GL_TRIANGLES
  98 };
  99
 100 static const int scale_prim[GL_POLYGON+1] = {
 101    0,                           /* fallback case */
 102    1,
 103    2,
 104    2,
 105    1,
 106    3,
 107    3,
 108    0,                           /* fallback case */
 109    0,                           /* fallback case */
 110    3
 111 };
 112
 113
 114 #define LOCAL_VARS i830ContextPtr imesa = I830_CONTEXT(ctx)
 115 #define INIT( prim ) do {                                               \
 116    I830_STATECHANGE(imesa, 0);                                          \
 117    i830RasterPrimitive( ctx, reduced_prim[prim], hw_prim[prim] );       \
 118 } while (0)
 119
 120 #define FLUSH()  I830_FIREVERTICES( imesa )
 121 #define GET_CURRENT_VB_MAX_VERTS() \
 122   (((int)imesa->vertex_high - (int)imesa->vertex_low) / (imesa->vertex_size*4))
 123 #define GET_SUBSEQUENT_VB_MAX_VERTS() \
 124   (I830_DMA_BUF_SZ-8) / (imesa->vertex_size * 4)
 125
 126
 127 #define ALLOC_VERTS( nr ) \
 128   i830AllocDmaLow( imesa, nr * imesa->vertex_size * 4)
 129 #define EMIT_VERTS( ctx, j, nr, buf ) \
 130   i830_emit_contiguous_verts(ctx, j, (j)+(nr), buf)
 131
 132 #define TAG(x) i830_##x
 133 #include "tnl_dd/t_dd_dmatmp.h"
 134
 135
 136 /**********************************************************************/
 137 /*                          Render pipeline stage                     */
 138 /**********************************************************************/
 139
 140 /* Heuristic for i830, which can only emit a single primitive per dma
 141  * buffer, and has only a small number of dma buffers.
 142  */
 143 static GLboolean choose_render( struct vertex_buffer *VB, int bufsz )
 144 {
 145    int nr_prims = 0;
 146    int nr_rprims = 0;
 147    int nr_rverts = 0;
 148    int rprim = 0;
 149    int i;
 150
 151
 152    for (i = 0 ; i < VB->PrimitiveCount ; i++)
 153    {
 154       GLuint prim = VB->Primitive[i].mode;
 155       GLuint length = VB->Primitive[i].count;
 156
 157       if (!length)
 158          continue;
 159
 160       if (!hw_prim[prim & PRIM_MODE_MASK])
 161          return GL_FALSE;
 162
 163       nr_prims++;
 164       nr_rverts += length * scale_prim[prim & PRIM_MODE_MASK];
 165
 166       if (reduced_prim[prim&PRIM_MODE_MASK] != rprim) {
 167          nr_rprims++;
 168          rprim = reduced_prim[prim&PRIM_MODE_MASK];
 169       }
 170    }
 171
 172    nr_prims += i / bufsz;
 173    nr_rprims += nr_rverts / bufsz;
 174
 175    if ((nr_prims > nr_rprims * 2) ||
 176        (nr_prims > nr_rprims + 3))
 177       return GL_FALSE;
 178
 179    return GL_TRUE;
 180 }
 181
 182
 183 static GLboolean i830_run_render( GLcontext *ctx,
 184                                  struct tnl_pipeline_stage *stage )
 185 {
 186    i830ContextPtr imesa = I830_CONTEXT(ctx);
 187    TNLcontext *tnl = TNL_CONTEXT(ctx);
 188    struct vertex_buffer *VB = &tnl->vb;
 189    GLuint i;
 190    /* Don't handle clipping or indexed vertices.
 191     */
 192    if (imesa->RenderIndex != 0 ||
 193        !i830_validate_render( ctx, VB ) ||
 194        !choose_render( VB, GET_SUBSEQUENT_VB_MAX_VERTS() )) {
 195       return GL_TRUE;
 196    }
 197
 198    imesa->SetupNewInputs = VERT_BIT_POS;
 199
 200    tnl->Driver.Render.Start( ctx );
 201
 202    for (i = 0 ; i < VB->PrimitiveCount ; i++)
 203    {
 204       GLuint prim = VB->Primitive[i].mode;
 205       GLuint start = VB->Primitive[i].start;
 206       GLuint length = VB->Primitive[i].count;
 207
 208       if (!length)
 209          continue;
 210
 211       i830_render_tab_verts[prim & PRIM_MODE_MASK]( ctx, start, start + length,
 212                                                     prim );
 213    }
 214
 215    tnl->Driver.Render.Finish( ctx );
 216
 217    return GL_FALSE;     /* finished the pipe */
 218 }
 219
 220
 221 static void i830_check_render( GLcontext *ctx,
 222                                struct tnl_pipeline_stage *stage )
 223 {
 224    stage->inputs = TNL_CONTEXT(ctx)->render_inputs;
 225 }
 226
 227 static void dtr( struct tnl_pipeline_stage *stage )
 228 {
 229    (void)stage;
 230 }
 231
 232
 233 const struct tnl_pipeline_stage _i830_render_stage =
 234 {
 235    "i830 render",
 236    (_DD_NEW_SEPARATE_SPECULAR |
 237     _NEW_TEXTURE|
 238     _NEW_FOG|
 239     _NEW_RENDERMODE),   /* re-check (new inputs) */
 240    0,                   /* re-run (always runs) */
 241    GL_TRUE,             /* active */
 242    0, 0,                /* inputs (set in check_render), outputs */
 243    0, 0,                /* changed_inputs, private */
 244    dtr,                 /* destructor */
 245    i830_check_render,   /* check - initially set to alloc data */
 246    i830_run_render      /* run */
 247 };