src/mesa/tnl/t_vb_render.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  5.1
   5  *
   6  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions 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 MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *    Keith Whitwell <keith@tungstengraphics.com>
  27  */
  28
  29
  30 /*
  31  * Render whole vertex buffers, including projection of vertices from
  32  * clip space and clipping of primitives.
  33  *
  34  * This file makes calls to project vertices and to the point, line
  35  * and triangle rasterizers via the function pointers:
  36  *
  37  *    context->Driver.Render.*
  38  *
  39  */
  40
  41
  42 #include "glheader.h"
  43 #include "context.h"
  44 #include "enums.h"
  45 #include "macros.h"
  46 #include "imports.h"
  47 #include "mtypes.h"
  48
  49 #include "math/m_matrix.h"
  50 #include "math/m_xform.h"
  51
  52 #include "t_pipeline.h"
  53
  54
  55
  56 /**********************************************************************/
  57 /*                        Clip single primitives                      */
  58 /**********************************************************************/
  59
  60
  61 #define W(i) coord[i][3]
  62 #define Z(i) coord[i][2]
  63 #define Y(i) coord[i][1]
  64 #define X(i) coord[i][0]
  65 #define SIZE 4
  66 #define TAG(x) x##_4
  67 #include "t_vb_cliptmp.h"
  68
  69
  70
  71 /**********************************************************************/
  72 /*              Clip and render whole begin/end objects               */
  73 /**********************************************************************/
  74
  75 #define NEED_EDGEFLAG_SETUP (ctx->Polygon.FrontMode != GL_FILL || ctx->Polygon.BackMode != GL_FILL)
  76 #define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
  77 #define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
  78
  79
  80 /* Vertices, with the possibility of clipping.
  81  */
  82 #define RENDER_POINTS( start, count ) \
  83    tnl->Driver.Render.Points( ctx, start, count )
  84
  85 #define RENDER_LINE( v1, v2 )                   \
  86 do {                                            \
  87    GLubyte c1 = mask[v1], c2 = mask[v2];        \
  88    GLubyte ormask = c1|c2;                      \
  89    if (!ormask)                                 \
  90       LineFunc( ctx, v1, v2 );                  \
  91    else if (!(c1 & c2 & 0x3f))                  \
  92       clip_line_4( ctx, v1, v2, ormask );       \
  93 } while (0)
  94
  95 #define RENDER_TRI( v1, v2, v3 )                        \
  96 do {                                                    \
  97    GLubyte c1 = mask[v1], c2 = mask[v2], c3 = mask[v3]; \
  98    GLubyte ormask = c1|c2|c3;                           \
  99    if (!ormask)                                         \
 100       TriangleFunc( ctx, v1, v2, v3 );                  \
 101    else if (!(c1 & c2 & c3 & 0x3f))                     \
 102       clip_tri_4( ctx, v1, v2, v3, ormask );            \
 103 } while (0)
 104
 105 #define RENDER_QUAD( v1, v2, v3, v4 )                   \
 106 do {                                                    \
 107    GLubyte c1 = mask[v1], c2 = mask[v2];                \
 108    GLubyte c3 = mask[v3], c4 = mask[v4];                \
 109    GLubyte ormask = c1|c2|c3|c4;                        \
 110    if (!ormask)                                         \
 111       QuadFunc( ctx, v1, v2, v3, v4 );                  \
 112    else if (!(c1 & c2 & c3 & c4 & 0x3f))                \
 113       clip_quad_4( ctx, v1, v2, v3, v4, ormask );       \
 114 } while (0)
 115
 116
 117 #define LOCAL_VARS                                              \
 118    TNLcontext *tnl = TNL_CONTEXT(ctx);                          \
 119    struct vertex_buffer *VB = &tnl->vb;                         \
 120    const GLuint * const elt = VB->Elts;                         \
 121    const GLubyte *mask = VB->ClipMask;                          \
 122    const GLuint sz = VB->ClipPtr->size;                         \
 123    const line_func LineFunc = tnl->Driver.Render.Line;          \
 124    const triangle_func TriangleFunc = tnl->Driver.Render.Triangle;      \
 125    const quad_func QuadFunc = tnl->Driver.Render.Quad;          \
 126    const GLboolean stipple = ctx->Line.StippleFlag;             \
 127    (void) (LineFunc && TriangleFunc && QuadFunc);               \
 128    (void) elt; (void) mask; (void) sz; (void) stipple;
 129
 130 #define TAG(x) clip_##x##_verts
 131 #define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
 132 #define RESET_STIPPLE if (stipple) tnl->Driver.Render.ResetLineStipple( ctx )
 133 #define RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
 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( GLcontext *ctx,
 150                                 GLuint start,
 151                                 GLuint count,
 152                                 GLuint flags )
 153 {
 154    TNLcontext *tnl = TNL_CONTEXT(ctx);
 155    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&0x3f))
 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 line_func LineFunc = tnl->Driver.Render.Line;          \
 213    const triangle_func TriangleFunc = tnl->Driver.Render.Triangle;      \
 214    const 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 RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
 221 #define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
 222 #define RENDER_TAB_QUALIFIER
 223 #define PRESERVE_VB_DEFS
 224 #include "t_vb_rendertmp.h"
 225
 226
 227 /* Elts, no clipping.
 228  */
 229 #undef ELT
 230 #define TAG(x) _tnl_##x##_elts
 231 #define ELT(x) elt[x]
 232 #include "t_vb_rendertmp.h"
 233
 234
 235 /**********************************************************************/
 236 /*              Helper functions for drivers                  */
 237 /**********************************************************************/
 238
 239 void _tnl_RenderClippedPolygon( GLcontext *ctx, const GLuint *elts, GLuint n )
 240 {
 241    TNLcontext *tnl = TNL_CONTEXT(ctx);
 242    struct vertex_buffer *VB = &tnl->vb;
 243    GLuint *tmp = VB->Elts;
 244
 245    VB->Elts = (GLuint *)elts;
 246    tnl->Driver.Render.PrimTabElts[GL_POLYGON]( ctx, 0, n, PRIM_BEGIN|PRIM_END );
 247    VB->Elts = tmp;
 248 }
 249
 250 void _tnl_RenderClippedLine( GLcontext *ctx, GLuint ii, GLuint jj )
 251 {
 252    TNLcontext *tnl = TNL_CONTEXT(ctx);
 253    tnl->Driver.Render.Line( ctx, ii, jj );
 254 }
 255
 256
 257
 258 /**********************************************************************/
 259 /*              Clip and render whole vertex buffers                  */
 260 /**********************************************************************/
 261
 262
 263 static GLboolean run_render( GLcontext *ctx,
 264                              struct gl_pipeline_stage *stage )
 265 {
 266    TNLcontext *tnl = TNL_CONTEXT(ctx);
 267    struct vertex_buffer *VB = &tnl->vb;
 268    GLuint new_inputs = stage->changed_inputs;
 269    render_func *tab;
 270    GLint pass = 0;
 271
 272    /* Allow the drivers to lock before projected verts are built so
 273     * that window coordinates are guarenteed not to change before
 274     * rendering.
 275     */
 276    ASSERT(tnl->Driver.Render.Start);
 277
 278    tnl->Driver.Render.Start( ctx );
 279
 280    ASSERT(tnl->Driver.Render.BuildVertices);
 281    ASSERT(tnl->Driver.Render.PrimitiveNotify);
 282    ASSERT(tnl->Driver.Render.Points);
 283    ASSERT(tnl->Driver.Render.Line);
 284    ASSERT(tnl->Driver.Render.Triangle);
 285    ASSERT(tnl->Driver.Render.Quad);
 286    ASSERT(tnl->Driver.Render.ResetLineStipple);
 287    ASSERT(tnl->Driver.Render.Interp);
 288    ASSERT(tnl->Driver.Render.CopyPV);
 289    ASSERT(tnl->Driver.Render.ClippedLine);
 290    ASSERT(tnl->Driver.Render.ClippedPolygon);
 291    ASSERT(tnl->Driver.Render.Finish);
 292
 293    tnl->Driver.Render.BuildVertices( ctx, 0, VB->Count, new_inputs );
 294
 295    if (VB->ClipOrMask) {
 296       tab = VB->Elts ? clip_render_tab_elts : clip_render_tab_verts;
 297       clip_render_tab_elts[GL_TRIANGLES] = clip_elt_triangles;
 298    }
 299    else {
 300       tab = (VB->Elts ?
 301              tnl->Driver.Render.PrimTabElts :
 302              tnl->Driver.Render.PrimTabVerts);
 303    }
 304
 305    do
 306    {
 307       GLuint i, length, flags = 0;
 308       for (i = VB->FirstPrimitive ; !(flags & PRIM_LAST) ; i += length)
 309       {
 310          flags = VB->Primitive[i];
 311          length= VB->PrimitiveLength[i];
 312          ASSERT(length || (flags & PRIM_LAST));
 313          ASSERT((flags & PRIM_MODE_MASK) <= GL_POLYGON+1);
 314
 315          if (MESA_VERBOSE & VERBOSE_PRIMS)
 316             _mesa_debug(NULL, "MESA prim %s %d..%d\n",
 317                     _mesa_lookup_enum_by_nr(flags & PRIM_MODE_MASK),
 318                     i, i+length);
 319
 320          if (length)
 321             tab[flags & PRIM_MODE_MASK]( ctx, i, i + length, flags );
 322       }
 323    } while (tnl->Driver.Render.Multipass &&
 324             tnl->Driver.Render.Multipass( ctx, ++pass ));
 325
 326
 327    tnl->Driver.Render.Finish( ctx );
 328 /*     _swrast_flush(ctx); */
 329 /*     usleep(1000000); */
 330    return GL_FALSE;             /* finished the pipe */
 331 }
 332
 333
 334 /**********************************************************************/
 335 /*                          Render pipeline stage                     */
 336 /**********************************************************************/
 337
 338
 339
 340 /* Quite a bit of work involved in finding out the inputs for the
 341  * render stage.
 342  */
 343 static void check_render( GLcontext *ctx, struct gl_pipeline_stage *stage )
 344 {
 345    GLuint inputs = VERT_BIT_CLIP;
 346    GLuint i;
 347
 348    if (ctx->Visual.rgbMode) {
 349       inputs |= VERT_BIT_COLOR0;
 350
 351       if (NEED_SECONDARY_COLOR(ctx))
 352          inputs |= VERT_BIT_COLOR1;
 353
 354       if (ctx->Texture._EnabledCoordUnits) {
 355          for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++) {
 356             if (ctx->Texture._EnabledCoordUnits & (1 << i))
 357                inputs |= VERT_BIT_TEX(i);
 358          }
 359       }
 360    }
 361    else {
 362       inputs |= VERT_BIT_INDEX;
 363    }
 364
 365    if (ctx->Point._Attenuated)
 366       inputs |= VERT_BIT_POINT_SIZE;
 367
 368    /* How do drivers turn this off?
 369     */
 370    if (ctx->Fog.Enabled)
 371       inputs |= VERT_BIT_FOG;
 372
 373    if (ctx->Polygon.FrontMode != GL_FILL || ctx->Polygon.BackMode != GL_FILL)
 374       inputs |= VERT_BIT_EDGEFLAG;
 375
 376    if (ctx->RenderMode==GL_FEEDBACK)
 377       inputs |= VERT_BITS_TEX_ANY;
 378
 379    stage->inputs = inputs;
 380 }
 381
 382
 383
 384
 385 static void dtr( struct gl_pipeline_stage *stage )
 386 {
 387 }
 388
 389
 390 const struct gl_pipeline_stage _tnl_render_stage =
 391 {
 392    "render",                    /* name */
 393    (_NEW_BUFFERS |
 394     _DD_NEW_SEPARATE_SPECULAR |
 395     _DD_NEW_FLATSHADE |
 396     _NEW_TEXTURE|
 397     _NEW_LIGHT|
 398     _NEW_POINT|
 399     _NEW_FOG|
 400     _DD_NEW_TRI_UNFILLED |
 401     _NEW_RENDERMODE),           /* re-check (new inputs, interp function) */
 402    0,                           /* re-run (always runs) */
 403    GL_TRUE,                     /* active? */
 404    0,                           /* inputs (set in check_render) */
 405    0,                           /* outputs */
 406    0,                           /* changed_inputs */
 407    NULL,                        /* private data */
 408    dtr,                         /* destructor */
 409    check_render,                /* check */
 410    run_render                   /* run */
 411 };