src/mesa/swrast_setup/ss_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2007  Brian Paul   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, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keithw@vmware.com>
  26  */
  27
  28 #include "main/glheader.h"
  29
  30 #include "main/macros.h"
  31 #include "main/state.h"
  32 #include "tnl/tnl.h"
  33 #include "tnl/t_context.h"
  34 #include "tnl/t_pipeline.h"
  35 #include "tnl/t_vertex.h"
  36 #include "swrast_setup.h"
  37 #include "ss_context.h"
  38 #include "ss_triangle.h"
  39
  40
  41 /* Need to check lighting state and vertex program state to know
  42  * if two-sided lighting is in effect.
  43  */
  44 #define _SWSETUP_NEW_RENDERINDEX (_NEW_POLYGON|_NEW_LIGHT|_NEW_PROGRAM)
  45
  46
  47 #define VARYING_EMIT_STYLE  EMIT_4F
  48
  49
  50 GLboolean
  51 _swsetup_CreateContext( struct gl_context *ctx )
  52 {
  53    SScontext *swsetup = calloc(1, sizeof(SScontext));
  54
  55    if (!swsetup)
  56       return GL_FALSE;
  57
  58    ctx->swsetup_context = swsetup;
  59
  60    swsetup->NewState = ~0;
  61    _swsetup_trifuncs_init( ctx );
  62
  63    _tnl_init_vertices( ctx, ctx->Const.MaxArrayLockSize + 12,
  64                        sizeof(SWvertex) );
  65
  66
  67    return GL_TRUE;
  68 }
  69
  70 void
  71 _swsetup_DestroyContext( struct gl_context *ctx )
  72 {
  73    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
  74
  75    if (swsetup) {
  76       free(swsetup);
  77       ctx->swsetup_context = 0;
  78    }
  79
  80    _tnl_free_vertices( ctx );
  81 }
  82
  83 static void
  84 _swsetup_RenderPrimitive( struct gl_context *ctx, GLenum mode )
  85 {
  86    SWSETUP_CONTEXT(ctx)->render_prim = mode;
  87    _swrast_render_primitive( ctx, mode );
  88 }
  89
  90
  91 /**
  92  * Helper macros for setup_vertex_format()
  93  */
  94 #define SWZ ((SWvertex *)0)
  95 #define SWOffset(MEMBER) (((char *)&(SWZ->MEMBER)) - ((char *)SWZ))
  96
  97 #define EMIT_ATTR( ATTR, STYLE, MEMBER )        \
  98 do {                                            \
  99    map[e].attrib = (ATTR);                      \
 100    map[e].format = (STYLE);                     \
 101    map[e].offset = SWOffset(MEMBER);            \
 102    e++;                                         \
 103 } while (0)
 104
 105
 106 /**
 107  * Tell the tnl module how to build SWvertex objects for swrast.
 108  * We'll build the map[] array with that info and pass it to
 109  * _tnl_install_attrs().
 110  */
 111 static void
 112 setup_vertex_format(struct gl_context *ctx)
 113 {
 114    TNLcontext *tnl = TNL_CONTEXT(ctx);
 115    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 116    GLboolean intColors = !ctx->FragmentProgram._Current
 117                       && !_mesa_ati_fragment_shader_enabled(ctx)
 118                       && ctx->RenderMode == GL_RENDER
 119                       && CHAN_TYPE != GL_FLOAT;
 120
 121    if (intColors != swsetup->intColors ||
 122        tnl->render_inputs_bitset != swsetup->last_index_bitset) {
 123       GLbitfield64 index_bitset = tnl->render_inputs_bitset;
 124       struct tnl_attr_map map[_TNL_ATTRIB_MAX];
 125       unsigned int i, e = 0;
 126
 127       swsetup->intColors = intColors;
 128
 129       EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, attrib[VARYING_SLOT_POS] );
 130
 131       if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_COLOR0)) {
 132          if (swsetup->intColors)
 133             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4CHAN_4F_RGBA, color );
 134          else
 135             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4F, attrib[VARYING_SLOT_COL0]);
 136       }
 137
 138       if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_COLOR1)) {
 139          EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_4F, attrib[VARYING_SLOT_COL1]);
 140       }
 141
 142       if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_FOG)) {
 143          const GLint emit = ctx->FragmentProgram._Current ? EMIT_4F : EMIT_1F;
 144          EMIT_ATTR( _TNL_ATTRIB_FOG, emit, attrib[VARYING_SLOT_FOGC]);
 145       }
 146
 147       if (index_bitset & BITFIELD64_RANGE(_TNL_ATTRIB_TEX0, _TNL_NUM_TEX))
 148       {
 149          for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 150             if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_TEX(i))) {
 151                EMIT_ATTR( _TNL_ATTRIB_TEX(i), EMIT_4F,
 152                           attrib[VARYING_SLOT_TEX0 + i] );
 153             }
 154          }
 155       }
 156
 157       /* shader varying vars */
 158       if (index_bitset & BITFIELD64_RANGE(_TNL_ATTRIB_GENERIC0, _TNL_NUM_GENERIC)) {
 159          for (i = 0; i < ctx->Const.MaxVarying; i++) {
 160             if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_GENERIC(i))) {
 161                EMIT_ATTR( _TNL_ATTRIB_GENERIC(i), VARYING_EMIT_STYLE,
 162                           attrib[VARYING_SLOT_VAR0 + i] );
 163             }
 164          }
 165       }
 166
 167       if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_POINTSIZE))
 168          EMIT_ATTR( _TNL_ATTRIB_POINTSIZE, EMIT_1F, pointSize );
 169
 170       _tnl_install_attrs( ctx, map, e,
 171                           tnl->_WindowMap.m,
 172                           sizeof(SWvertex) );
 173
 174       swsetup->last_index_bitset = index_bitset;
 175    }
 176 }
 177
 178
 179 /**
 180  * Prepare to render a vertex buffer.
 181  * Called via tnl->Driver.Render.Start.
 182  */
 183 static void
 184 _swsetup_RenderStart( struct gl_context *ctx )
 185 {
 186    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 187    TNLcontext *tnl = TNL_CONTEXT(ctx);
 188    struct vertex_buffer *VB = &tnl->vb;
 189
 190    if (swsetup->NewState & _SWSETUP_NEW_RENDERINDEX) {
 191       _swsetup_choose_trifuncs(ctx);
 192    }
 193
 194    if (swsetup->NewState & _NEW_PROGRAM) {
 195       swsetup->last_index_bitset = 0;
 196    }
 197
 198    swsetup->NewState = 0;
 199
 200    /* This will change if drawing unfilled tris */
 201    _swrast_SetFacing(ctx, 0);
 202
 203    _swrast_render_start(ctx);
 204
 205    /* Important */
 206    VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
 207
 208    setup_vertex_format(ctx);
 209 }
 210
 211
 212 /*
 213  * We patch this function into tnl->Driver.Render.Finish.
 214  * It's called when we finish rendering a vertex buffer.
 215  */
 216 static void
 217 _swsetup_RenderFinish( struct gl_context *ctx )
 218 {
 219    _swrast_render_finish( ctx );
 220 }
 221
 222 void
 223 _swsetup_InvalidateState( struct gl_context *ctx, GLuint new_state )
 224 {
 225    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 226    swsetup->NewState |= new_state;
 227    _tnl_invalidate_vertex_state( ctx, new_state );
 228 }
 229
 230
 231 void
 232 _swsetup_Wakeup( struct gl_context *ctx )
 233 {
 234    TNLcontext *tnl = TNL_CONTEXT(ctx);
 235    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 236
 237    tnl->Driver.Render.Start = _swsetup_RenderStart;
 238    tnl->Driver.Render.Finish = _swsetup_RenderFinish;
 239    tnl->Driver.Render.PrimitiveNotify = _swsetup_RenderPrimitive;
 240    tnl->Driver.Render.Interp = _tnl_interp;
 241    tnl->Driver.Render.CopyPV = _tnl_copy_pv;
 242    tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon; /* new */
 243    tnl->Driver.Render.ClippedLine = _tnl_RenderClippedLine; /* new */
 244    /* points */
 245    /* line */
 246    /* triangle */
 247    /* quad */
 248    tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
 249    tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
 250    tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
 251    tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
 252    tnl->Driver.Render.Multipass = 0;
 253
 254    _tnl_invalidate_vertices( ctx, ~0 );
 255    _tnl_need_projected_coords( ctx, GL_TRUE );
 256    _swsetup_InvalidateState( ctx, ~0 );
 257
 258    swsetup->verts = (SWvertex *)tnl->clipspace.vertex_buf;
 259    swsetup->last_index_bitset = 0;
 260 }
 261
 262
 263 /**
 264  * Populate a swrast SWvertex from an attrib-style vertex.
 265  */
 266 void
 267 _swsetup_Translate( struct gl_context *ctx, const void *vertex, SWvertex *dest )
 268 {
 269    TNLcontext *tnl = TNL_CONTEXT(ctx);
 270    const GLfloat *m = tnl->_WindowMap.m;
 271    GLfloat tmp[4];
 272    GLuint i;
 273
 274    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POS, tmp );
 275
 276    dest->attrib[VARYING_SLOT_POS][0] = m[0]  * tmp[0] + m[12];
 277    dest->attrib[VARYING_SLOT_POS][1] = m[5]  * tmp[1] + m[13];
 278    dest->attrib[VARYING_SLOT_POS][2] = m[10] * tmp[2] + m[14];
 279    dest->attrib[VARYING_SLOT_POS][3] =         tmp[3];
 280
 281    /** XXX try to limit these loops someday */
 282    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 283       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_TEX0 + i,
 284                      dest->attrib[VARYING_SLOT_TEX0 + i] );
 285
 286    for (i = 0 ; i < ctx->Const.MaxVarying ; i++)
 287       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_GENERIC0 + i,
 288                      dest->attrib[VARYING_SLOT_VAR0 + i] );
 289
 290    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR0,
 291                   dest->attrib[VARYING_SLOT_COL0] );
 292
 293    UNCLAMPED_FLOAT_TO_RGBA_CHAN(dest->color, dest->attrib[VARYING_SLOT_COL0]);
 294
 295    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR1,
 296                   dest->attrib[VARYING_SLOT_COL1]);
 297
 298    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_FOG, tmp );
 299    dest->attrib[VARYING_SLOT_FOGC][0] = tmp[0];
 300
 301    /* XXX See _tnl_get_attr about pointsize ... */
 302    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POINTSIZE, tmp );
 303    dest->pointSize = tmp[0];
 304 }
 305