src/mesa/swrast_setup/ss_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2007  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  * BRIAN PAUL 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 #include "main/glheader.h"
  29 #include "main/imports.h"
  30 #include "main/colormac.h"
  31 #include "tnl/tnl.h"
  32 #include "tnl/t_context.h"
  33 #include "tnl/t_pipeline.h"
  34 #include "tnl/t_vertex.h"
  35 #include "swrast_setup.h"
  36 #include "ss_context.h"
  37 #include "ss_triangle.h"
  38
  39
  40 /* Need to check lighting state and vertex program state to know
  41  * if two-sided lighting is in effect.
  42  */
  43 #define _SWSETUP_NEW_RENDERINDEX (_NEW_POLYGON|_NEW_LIGHT|_NEW_PROGRAM)
  44
  45
  46 #define VARYING_EMIT_STYLE  EMIT_4F
  47
  48
  49 GLboolean
  50 _swsetup_CreateContext( GLcontext *ctx )
  51 {
  52    SScontext *swsetup = (SScontext *)CALLOC(sizeof(SScontext));
  53
  54    if (!swsetup)
  55       return GL_FALSE;
  56
  57    ctx->swsetup_context = swsetup;
  58
  59    swsetup->NewState = ~0;
  60    _swsetup_trifuncs_init( ctx );
  61
  62    _tnl_init_vertices( ctx, ctx->Const.MaxArrayLockSize + 12,
  63                        sizeof(SWvertex) );
  64
  65
  66    return GL_TRUE;
  67 }
  68
  69 void
  70 _swsetup_DestroyContext( GLcontext *ctx )
  71 {
  72    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
  73
  74    if (swsetup) {
  75       FREE(swsetup);
  76       ctx->swsetup_context = 0;
  77    }
  78
  79    _tnl_free_vertices( ctx );
  80 }
  81
  82 static void
  83 _swsetup_RenderPrimitive( GLcontext *ctx, GLenum mode )
  84 {
  85    SWSETUP_CONTEXT(ctx)->render_prim = mode;
  86    _swrast_render_primitive( ctx, mode );
  87 }
  88
  89
  90 /**
  91  * Helper macros for setup_vertex_format()
  92  */
  93 #define SWZ ((SWvertex *)0)
  94 #define SWOffset(MEMBER) (((char *)&(SWZ->MEMBER)) - ((char *)SWZ))
  95
  96 #define EMIT_ATTR( ATTR, STYLE, MEMBER )        \
  97 do {                                            \
  98    map[e].attrib = (ATTR);                      \
  99    map[e].format = (STYLE);                     \
 100    map[e].offset = SWOffset(MEMBER);            \
 101    e++;                                         \
 102 } while (0)
 103
 104
 105 /**
 106  * Tell the tnl module how to build SWvertex objects for swrast.
 107  * We'll build the map[] array with that info and pass it to
 108  * _tnl_install_attrs().
 109  */
 110 static void
 111 setup_vertex_format(GLcontext *ctx)
 112 {
 113    TNLcontext *tnl = TNL_CONTEXT(ctx);
 114    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 115    GLboolean intColors = !ctx->FragmentProgram._Current
 116                       && !ctx->ATIFragmentShader._Enabled
 117                       && ctx->RenderMode == GL_RENDER
 118                       && CHAN_TYPE == GL_UNSIGNED_BYTE;
 119
 120    if (intColors != swsetup->intColors ||
 121        !RENDERINPUTS_EQUAL(tnl->render_inputs_bitset,
 122                            swsetup->last_index_bitset)) {
 123       DECLARE_RENDERINPUTS(index_bitset);
 124       struct tnl_attr_map map[_TNL_ATTRIB_MAX];
 125       int i, e = 0;
 126
 127       swsetup->intColors = intColors;
 128
 129       RENDERINPUTS_COPY( index_bitset, tnl->render_inputs_bitset );
 130
 131       EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, attrib[FRAG_ATTRIB_WPOS] );
 132
 133       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR0 )) {
 134          if (swsetup->intColors)
 135             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4CHAN_4F_RGBA, color );
 136          else
 137             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4F, attrib[FRAG_ATTRIB_COL0]);
 138       }
 139
 140       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR1 )) {
 141          EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_4F, attrib[FRAG_ATTRIB_COL1]);
 142       }
 143
 144       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR_INDEX )) {
 145          EMIT_ATTR( _TNL_ATTRIB_COLOR_INDEX, EMIT_1F,
 146                     attrib[FRAG_ATTRIB_CI][0] );
 147       }
 148
 149       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_FOG )) {
 150          const GLint emit = ctx->FragmentProgram._Current ? EMIT_4F : EMIT_1F;
 151          EMIT_ATTR( _TNL_ATTRIB_FOG, emit, attrib[FRAG_ATTRIB_FOGC]);
 152       }
 153
 154       if (RENDERINPUTS_TEST_RANGE(index_bitset, _TNL_FIRST_TEX, _TNL_LAST_TEX))
 155       {
 156          for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 157             if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_TEX(i) )) {
 158                EMIT_ATTR( _TNL_ATTRIB_TEX(i), EMIT_4F,
 159                           attrib[FRAG_ATTRIB_TEX0 + i] );
 160             }
 161          }
 162       }
 163
 164       /* shader varying vars */
 165       if (RENDERINPUTS_TEST_RANGE( index_bitset,
 166                                    _TNL_FIRST_GENERIC, _TNL_LAST_GENERIC )) {
 167          for (i = 0; i < ctx->Const.MaxVarying; i++) {
 168             if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_GENERIC(i) )) {
 169                EMIT_ATTR( _TNL_ATTRIB_GENERIC(i), VARYING_EMIT_STYLE,
 170                           attrib[FRAG_ATTRIB_VAR0 + i] );
 171             }
 172          }
 173       }
 174
 175       if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_POINTSIZE ))
 176          EMIT_ATTR( _TNL_ATTRIB_POINTSIZE, EMIT_1F, pointSize );
 177
 178       _tnl_install_attrs( ctx, map, e,
 179                           ctx->Viewport._WindowMap.m,
 180                           sizeof(SWvertex) );
 181
 182       RENDERINPUTS_COPY( swsetup->last_index_bitset, index_bitset );
 183    }
 184 }
 185
 186
 187 /**
 188  * Prepare to render a vertex buffer.
 189  * Called via tnl->Driver.Render.Start.
 190  */
 191 static void
 192 _swsetup_RenderStart( GLcontext *ctx )
 193 {
 194    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 195    TNLcontext *tnl = TNL_CONTEXT(ctx);
 196    struct vertex_buffer *VB = &tnl->vb;
 197
 198    if (swsetup->NewState & _SWSETUP_NEW_RENDERINDEX) {
 199       _swsetup_choose_trifuncs(ctx);
 200    }
 201
 202    if (swsetup->NewState & _NEW_PROGRAM) {
 203       RENDERINPUTS_ZERO( swsetup->last_index_bitset );
 204    }
 205
 206    swsetup->NewState = 0;
 207
 208    /* This will change if drawing unfilled tris */
 209    _swrast_SetFacing(ctx, 0);
 210
 211    _swrast_render_start(ctx);
 212
 213    /* Important */
 214    VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
 215
 216    setup_vertex_format(ctx);
 217 }
 218
 219
 220 /*
 221  * We patch this function into tnl->Driver.Render.Finish.
 222  * It's called when we finish rendering a vertex buffer.
 223  */
 224 static void
 225 _swsetup_RenderFinish( GLcontext *ctx )
 226 {
 227    _swrast_render_finish( ctx );
 228 }
 229
 230 void
 231 _swsetup_InvalidateState( GLcontext *ctx, GLuint new_state )
 232 {
 233    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 234    swsetup->NewState |= new_state;
 235    _tnl_invalidate_vertex_state( ctx, new_state );
 236 }
 237
 238
 239 void
 240 _swsetup_Wakeup( GLcontext *ctx )
 241 {
 242    TNLcontext *tnl = TNL_CONTEXT(ctx);
 243    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 244
 245    tnl->Driver.Render.Start = _swsetup_RenderStart;
 246    tnl->Driver.Render.Finish = _swsetup_RenderFinish;
 247    tnl->Driver.Render.PrimitiveNotify = _swsetup_RenderPrimitive;
 248    tnl->Driver.Render.Interp = _tnl_interp;
 249    tnl->Driver.Render.CopyPV = _tnl_copy_pv;
 250    tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon; /* new */
 251    tnl->Driver.Render.ClippedLine = _tnl_RenderClippedLine; /* new */
 252    /* points */
 253    /* line */
 254    /* triangle */
 255    /* quad */
 256    tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
 257    tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
 258    tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
 259    tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
 260    tnl->Driver.Render.Multipass = 0;
 261
 262    _tnl_invalidate_vertices( ctx, ~0 );
 263    _tnl_need_projected_coords( ctx, GL_TRUE );
 264    _swsetup_InvalidateState( ctx, ~0 );
 265
 266    swsetup->verts = (SWvertex *)tnl->clipspace.vertex_buf;
 267    RENDERINPUTS_ZERO( swsetup->last_index_bitset );
 268 }
 269
 270
 271 /**
 272  * Populate a swrast SWvertex from an attrib-style vertex.
 273  */
 274 void
 275 _swsetup_Translate( GLcontext *ctx, const void *vertex, SWvertex *dest )
 276 {
 277    const GLfloat *m = ctx->Viewport._WindowMap.m;
 278    GLfloat tmp[4];
 279    GLuint i;
 280
 281    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POS, tmp );
 282
 283    dest->attrib[FRAG_ATTRIB_WPOS][0] = m[0]  * tmp[0] + m[12];
 284    dest->attrib[FRAG_ATTRIB_WPOS][1] = m[5]  * tmp[1] + m[13];
 285    dest->attrib[FRAG_ATTRIB_WPOS][2] = m[10] * tmp[2] + m[14];
 286    dest->attrib[FRAG_ATTRIB_WPOS][3] =         tmp[3];
 287
 288    /** XXX try to limit these loops someday */
 289    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 290       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_TEX0 + i,
 291                      dest->attrib[FRAG_ATTRIB_TEX0 + i] );
 292
 293    for (i = 0 ; i < ctx->Const.MaxVarying ; i++)
 294       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_GENERIC0 + i,
 295                      dest->attrib[FRAG_ATTRIB_VAR0 + i] );
 296
 297    if (ctx->Visual.rgbMode) {
 298       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR0,
 299                      dest->attrib[FRAG_ATTRIB_COL0] );
 300       UNCLAMPED_FLOAT_TO_RGBA_CHAN( dest->color, tmp );
 301
 302       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR1,
 303                      dest->attrib[FRAG_ATTRIB_COL1]);
 304    }
 305    else {
 306       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR_INDEX, tmp );
 307       dest->attrib[FRAG_ATTRIB_CI][0] = tmp[0];
 308    }
 309
 310    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_FOG, tmp );
 311    dest->attrib[FRAG_ATTRIB_FOGC][0] = tmp[0];
 312
 313    /* XXX See _tnl_get_attr about pointsize ... */
 314    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POINTSIZE, tmp );
 315    dest->pointSize = tmp[0];
 316 }
 317