src/mesa/tnl/t_vb_render.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  */
  27
  28
  29 /*
  30  * Render whole vertex buffers, including projection of vertices from
  31  * clip space and clipping of primitives.
  32  *
  33  * This file makes calls to project vertices and to the point, line
  34  * and triangle rasterizers via the function pointers:
  35  *
  36  *    context->Driver.Render.*
  37  *
  38  */
  39
  40
  41 #include "main/glheader.h"
  42 #include "main/context.h"
  43 #include "main/enums.h"
  44 #include "main/macros.h"
  45 #include "main/imports.h"
  46 #include "main/mtypes.h"
  47 #include "math/m_xform.h"
  48
  49 #include "t_pipeline.h"
  50
  51
  52
  53 /**********************************************************************/
  54 /*                        Clip single primitives                      */
  55 /**********************************************************************/
  56
  57
  58 #define W(i) coord[i][3]
  59 #define Z(i) coord[i][2]
  60 #define Y(i) coord[i][1]
  61 #define X(i) coord[i][0]
  62 #define SIZE 4
  63 #define TAG(x) x##_4
  64 #include "t_vb_cliptmp.h"
  65
  66
  67
  68 /**********************************************************************/
  69 /*              Clip and render whole begin/end objects               */
  70 /**********************************************************************/
  71
  72 #define NEED_EDGEFLAG_SETUP (ctx->Polygon.FrontMode != GL_FILL || ctx->Polygon.BackMode != GL_FILL)
  73 #define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
  74 #define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
  75
  76
  77 /* This does NOT include the CLIP_USER_BIT! */
  78 #define CLIPMASK (CLIP_FRUSTUM_BITS | CLIP_CULL_BIT)
  79
  80
  81 /* Vertices, with the possibility of clipping.
  82  */
  83 #define RENDER_POINTS( start, count ) \
  84    tnl->Driver.Render.Points( ctx, start, count )
  85
  86 #define RENDER_LINE( v1, v2 )                   \
  87 do {                                            \
  88    GLubyte c1 = mask[v1], c2 = mask[v2];        \
  89    GLubyte ormask = c1|c2;                      \
  90    if (!ormask)                                 \
  91       LineFunc( ctx, v1, v2 );                  \
  92    else if (!(c1 & c2 & CLIPMASK))                      \
  93       clip_line_4( ctx, v1, v2, ormask );       \
  94 } while (0)
  95
  96 #define RENDER_TRI( v1, v2, v3 )                        \
  97 do {                                                    \
  98    GLubyte c1 = mask[v1], c2 = mask[v2], c3 = mask[v3]; \
  99    GLubyte ormask = c1|c2|c3;                           \
 100    if (!ormask)                                         \
 101       TriangleFunc( ctx, v1, v2, v3 );                  \
 102    else if (!(c1 & c2 & c3 & CLIPMASK))                         \
 103       clip_tri_4( ctx, v1, v2, v3, ormask );            \
 104 } while (0)
 105
 106 #define RENDER_QUAD( v1, v2, v3, v4 )                   \
 107 do {                                                    \
 108    GLubyte c1 = mask[v1], c2 = mask[v2];                \
 109    GLubyte c3 = mask[v3], c4 = mask[v4];                \
 110    GLubyte ormask = c1|c2|c3|c4;                        \
 111    if (!ormask)                                         \
 112       QuadFunc( ctx, v1, v2, v3, v4 );                  \
 113    else if (!(c1 & c2 & c3 & c4 & CLIPMASK))            \
 114       clip_quad_4( ctx, v1, v2, v3, v4, ormask );       \
 115 } while (0)
 116
 117
 118 #define LOCAL_VARS                                              \
 119    TNLcontext *tnl = TNL_CONTEXT(ctx);                          \
 120    struct vertex_buffer *VB = &tnl->vb;                         \
 121    const GLuint * const elt = VB->Elts;                         \
 122    const GLubyte *mask = VB->ClipMask;                          \
 123    const GLuint sz = VB->ClipPtr->size;                         \
 124    const tnl_line_func LineFunc = tnl->Driver.Render.Line;              \
 125    const tnl_triangle_func TriangleFunc = tnl->Driver.Render.Triangle;  \
 126    const tnl_quad_func QuadFunc = tnl->Driver.Render.Quad;              \
 127    const GLboolean stipple = ctx->Line.StippleFlag;             \
 128    (void) (LineFunc && TriangleFunc && QuadFunc);               \
 129    (void) elt; (void) mask; (void) sz; (void) stipple;
 130
 131 #define TAG(x) clip_##x##_verts
 132 #define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
 133 #define RESET_STIPPLE if (stipple) tnl->Driver.Render.ResetLineStipple( ctx )
 134 #define PRESERVE_VB_DEFS
 135 #include "t_vb_rendertmp.h"
 136
 137
 138
 139 /* Elts, with the possibility of clipping.
 140  */
 141 #undef ELT
 142 #undef TAG
 143 #define ELT(x) elt[x]
 144 #define TAG(x) clip_##x##_elts
 145 #include "t_vb_rendertmp.h"
 146
 147 /* TODO: do this for all primitives, verts and elts:
 148  */
 149 static void clip_elt_triangles( struct gl_context *ctx,
 150                                 GLuint start,
 151                                 GLuint count,
 152                                 GLuint flags )
 153 {
 154    TNLcontext *tnl = TNL_CONTEXT(ctx);
 155    tnl_render_func render_tris = tnl->Driver.Render.PrimTabElts[GL_TRIANGLES];
 156    struct vertex_buffer *VB = &tnl->vb;
 157    const GLuint * const elt = VB->Elts;
 158    GLubyte *mask = VB->ClipMask;
 159    GLuint last = count-2;
 160    GLuint j;
 161    (void) flags;
 162
 163    tnl->Driver.Render.PrimitiveNotify( ctx, GL_TRIANGLES );
 164
 165    for (j=start; j < last; j+=3 ) {
 166       GLubyte c1 = mask[elt[j]];
 167       GLubyte c2 = mask[elt[j+1]];
 168       GLubyte c3 = mask[elt[j+2]];
 169       GLubyte ormask = c1|c2|c3;
 170       if (ormask) {
 171          if (start < j)
 172             render_tris( ctx, start, j, 0 );
 173          if (!(c1&c2&c3&CLIPMASK))
 174             clip_tri_4( ctx, elt[j], elt[j+1], elt[j+2], ormask );
 175          start = j+3;
 176       }
 177    }
 178
 179    if (start < j)
 180       render_tris( ctx, start, j, 0 );
 181 }
 182
 183 /**********************************************************************/
 184 /*                  Render whole begin/end objects                    */
 185 /**********************************************************************/
 186
 187 #define NEED_EDGEFLAG_SETUP (ctx->Polygon.FrontMode != GL_FILL || ctx->Polygon.BackMode != GL_FILL)
 188 #define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
 189 #define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
 190
 191
 192 /* Vertices, no clipping.
 193  */
 194 #define RENDER_POINTS( start, count ) \
 195    tnl->Driver.Render.Points( ctx, start, count )
 196
 197 #define RENDER_LINE( v1, v2 ) \
 198    LineFunc( ctx, v1, v2 )
 199
 200 #define RENDER_TRI( v1, v2, v3 ) \
 201    TriangleFunc( ctx, v1, v2, v3 )
 202
 203 #define RENDER_QUAD( v1, v2, v3, v4 ) \
 204    QuadFunc( ctx, v1, v2, v3, v4 )
 205
 206 #define TAG(x) _tnl_##x##_verts
 207
 208 #define LOCAL_VARS                                              \
 209    TNLcontext *tnl = TNL_CONTEXT(ctx);                          \
 210    struct vertex_buffer *VB = &tnl->vb;                         \
 211    const GLuint * const elt = VB->Elts;                         \
 212    const tnl_line_func LineFunc = tnl->Driver.Render.Line;              \
 213    const tnl_triangle_func TriangleFunc = tnl->Driver.Render.Triangle;  \
 214    const tnl_quad_func QuadFunc = tnl->Driver.Render.Quad;              \
 215    const GLboolean stipple = ctx->Line.StippleFlag;             \
 216    (void) (LineFunc && TriangleFunc && QuadFunc);               \
 217    (void) elt; (void) stipple
 218
 219 #define RESET_STIPPLE if (stipple) tnl->Driver.Render.ResetLineStipple( ctx )
 220 #define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
 221 #define RENDER_TAB_QUALIFIER
 222 #define PRESERVE_VB_DEFS
 223 #include "t_vb_rendertmp.h"
 224
 225
 226 /* Elts, no clipping.
 227  */
 228 #undef ELT
 229 #define TAG(x) _tnl_##x##_elts
 230 #define ELT(x) elt[x]
 231 #include "t_vb_rendertmp.h"
 232
 233
 234 /**********************************************************************/
 235 /*              Helper functions for drivers                  */
 236 /**********************************************************************/
 237
 238 void _tnl_RenderClippedPolygon( struct gl_context *ctx, const GLuint *elts, GLuint n )
 239 {
 240    TNLcontext *tnl = TNL_CONTEXT(ctx);
 241    struct vertex_buffer *VB = &tnl->vb;
 242    GLuint *tmp = VB->Elts;
 243
 244    VB->Elts = (GLuint *)elts;
 245    tnl->Driver.Render.PrimTabElts[GL_POLYGON]( ctx, 0, n, PRIM_BEGIN|PRIM_END );
 246    VB->Elts = tmp;
 247 }
 248
 249 void _tnl_RenderClippedLine( struct gl_context *ctx, GLuint ii, GLuint jj )
 250 {
 251    TNLcontext *tnl = TNL_CONTEXT(ctx);
 252    tnl->Driver.Render.Line( ctx, ii, jj );
 253 }
 254
 255
 256
 257 /**********************************************************************/
 258 /*              Clip and render whole vertex buffers                  */
 259 /**********************************************************************/
 260
 261
 262 static GLboolean run_render( struct gl_context *ctx,
 263                              struct tnl_pipeline_stage *stage )
 264 {
 265    TNLcontext *tnl = TNL_CONTEXT(ctx);
 266    struct vertex_buffer *VB = &tnl->vb;
 267    tnl_render_func *tab;
 268    GLint pass = 0;
 269
 270    /* Allow the drivers to lock before projected verts are built so
 271     * that window coordinates are guarenteed not to change before
 272     * rendering.
 273     */
 274    ASSERT(tnl->Driver.Render.Start);
 275
 276    tnl->Driver.Render.Start( ctx );
 277
 278    ASSERT(tnl->Driver.Render.BuildVertices);
 279    ASSERT(tnl->Driver.Render.PrimitiveNotify);
 280    ASSERT(tnl->Driver.Render.Points);
 281    ASSERT(tnl->Driver.Render.Line);
 282    ASSERT(tnl->Driver.Render.Triangle);
 283    ASSERT(tnl->Driver.Render.Quad);
 284    ASSERT(tnl->Driver.Render.ResetLineStipple);
 285    ASSERT(tnl->Driver.Render.Interp);
 286    ASSERT(tnl->Driver.Render.CopyPV);
 287    ASSERT(tnl->Driver.Render.ClippedLine);
 288    ASSERT(tnl->Driver.Render.ClippedPolygon);
 289    ASSERT(tnl->Driver.Render.Finish);
 290
 291    tnl->Driver.Render.BuildVertices( ctx, 0, VB->Count, ~0 );
 292
 293    if (VB->ClipOrMask) {
 294       tab = VB->Elts ? clip_render_tab_elts : clip_render_tab_verts;
 295       clip_render_tab_elts[GL_TRIANGLES] = clip_elt_triangles;
 296    }
 297    else {
 298       tab = (VB->Elts ?
 299              tnl->Driver.Render.PrimTabElts :
 300              tnl->Driver.Render.PrimTabVerts);
 301    }
 302
 303    do
 304    {
 305       GLuint i;
 306
 307       for (i = 0 ; i < VB->PrimitiveCount ; i++)
 308       {
 309          GLuint prim = _tnl_translate_prim(&VB->Primitive[i]);
 310          GLuint start = VB->Primitive[i].start;
 311          GLuint length = VB->Primitive[i].count;
 312
 313          assert((prim & PRIM_MODE_MASK) <= GL_POLYGON);
 314
 315          if (MESA_VERBOSE & VERBOSE_PRIMS)
 316             _mesa_debug(NULL, "MESA prim %s %d..%d\n",
 317                         _mesa_lookup_enum_by_nr(prim & PRIM_MODE_MASK),
 318                         start, start+length);
 319
 320          if (length)
 321             tab[prim & PRIM_MODE_MASK]( ctx, start, start + length, prim );
 322       }
 323    } while (tnl->Driver.Render.Multipass &&
 324             tnl->Driver.Render.Multipass( ctx, ++pass ));
 325
 326    tnl->Driver.Render.Finish( ctx );
 327
 328    return GL_FALSE;             /* finished the pipe */
 329 }
 330
 331
 332 /**********************************************************************/
 333 /*                          Render pipeline stage                     */
 334 /**********************************************************************/
 335
 336
 337
 338
 339
 340 const struct tnl_pipeline_stage _tnl_render_stage =
 341 {
 342    "render",                    /* name */
 343    NULL,                        /* private data */
 344    NULL,                        /* creator */
 345    NULL,                        /* destructor */
 346    NULL,                        /* validate */
 347    run_render                   /* run */
 348 };