src/mesa/vbo/vbo_save_loopback.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2005 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * 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
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * 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
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "main/context.h"
  29 #include "main/glheader.h"
  30 #include "main/enums.h"
  31 #include "main/imports.h"
  32 #include "main/mtypes.h"
  33 #include "main/dispatch.h"
  34 #include "glapi/glapi.h"
  35
  36 #include "vbo_context.h"
  37
  38
  39 #if FEATURE_dlist
  40
  41
  42 typedef void (*attr_func)( struct gl_context *ctx, GLint target, const GLfloat * );
  43
  44
  45 /* This file makes heavy use of the aliasing of NV vertex attributes
  46  * with the legacy attributes, and also with ARB and Material
  47  * attributes as currently implemented.
  48  */
  49 static void VertexAttrib1fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  50 {
  51    CALL_VertexAttrib1fvNV(ctx->Exec, (target, v));
  52 }
  53
  54 static void VertexAttrib2fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  55 {
  56    CALL_VertexAttrib2fvNV(ctx->Exec, (target, v));
  57 }
  58
  59 static void VertexAttrib3fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  60 {
  61    CALL_VertexAttrib3fvNV(ctx->Exec, (target, v));
  62 }
  63
  64 static void VertexAttrib4fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  65 {
  66    CALL_VertexAttrib4fvNV(ctx->Exec, (target, v));
  67 }
  68
  69 static attr_func vert_attrfunc[4] = {
  70    VertexAttrib1fvNV,
  71    VertexAttrib2fvNV,
  72    VertexAttrib3fvNV,
  73    VertexAttrib4fvNV
  74 };
  75
  76 struct loopback_attr {
  77    GLint target;
  78    GLint sz;
  79    attr_func func;
  80 };
  81
  82 /* Don't emit ends and begins on wrapped primitives.  Don't replay
  83  * wrapped vertices.  If we get here, it's probably because the
  84  * precalculated wrapping is wrong.
  85  */
  86 static void loopback_prim( struct gl_context *ctx,
  87                            const GLfloat *buffer,
  88                            const struct _mesa_prim *prim,
  89                            GLuint wrap_count,
  90                            GLuint vertex_size,
  91                            const struct loopback_attr *la, GLuint nr )
  92 {
  93    GLint start = prim->start;
  94    GLint end = start + prim->count;
  95    const GLfloat *data;
  96    GLint j;
  97    GLuint k;
  98
  99    if (0)
 100       printf("loopback prim %s(%s,%s) verts %d..%d\n",
 101              _mesa_lookup_prim_by_nr(prim->mode),
 102              prim->begin ? "begin" : "..",
 103              prim->end ? "end" : "..",
 104              start,
 105              end);
 106
 107    if (prim->begin) {
 108       CALL_Begin(GET_DISPATCH(), ( prim->mode ));
 109    }
 110    else {
 111       assert(start == 0);
 112       start += wrap_count;
 113    }
 114
 115    data = buffer + start * vertex_size;
 116
 117    for (j = start ; j < end ; j++) {
 118       const GLfloat *tmp = data + la[0].sz;
 119
 120       for (k = 1 ; k < nr ; k++) {
 121          la[k].func( ctx, la[k].target, tmp );
 122          tmp += la[k].sz;
 123       }
 124
 125       /* Fire the vertex
 126        */
 127       la[0].func( ctx, VBO_ATTRIB_POS, data );
 128       data = tmp;
 129    }
 130
 131    if (prim->end) {
 132       CALL_End(GET_DISPATCH(), ());
 133    }
 134 }
 135
 136 /* Primitives generated by DrawArrays/DrawElements/Rectf may be
 137  * caught here.  If there is no primitive in progress, execute them
 138  * normally, otherwise need to track and discard the generated
 139  * primitives.
 140  */
 141 static void loopback_weak_prim( struct gl_context *ctx,
 142                                 const struct _mesa_prim *prim )
 143 {
 144    /* Use the prim_weak flag to ensure that if this primitive
 145     * wraps, we don't mistake future vertex_lists for part of the
 146     * surrounding primitive.
 147     *
 148     * While this flag is set, we are simply disposing of data
 149     * generated by an operation now known to be a noop.
 150     */
 151    if (prim->begin)
 152       ctx->Driver.CurrentExecPrimitive |= VBO_SAVE_PRIM_WEAK;
 153    if (prim->end)
 154       ctx->Driver.CurrentExecPrimitive &= ~VBO_SAVE_PRIM_WEAK;
 155 }
 156
 157
 158 void vbo_loopback_vertex_list( struct gl_context *ctx,
 159                                const GLfloat *buffer,
 160                                const GLubyte *attrsz,
 161                                const struct _mesa_prim *prim,
 162                                GLuint prim_count,
 163                                GLuint wrap_count,
 164                                GLuint vertex_size)
 165 {
 166    struct loopback_attr la[VBO_ATTRIB_MAX];
 167    GLuint i, nr = 0;
 168
 169    /* All Legacy, NV, ARB and Material attributes are routed through
 170     * the NV attributes entrypoints:
 171     */
 172    for (i = 0 ; i < VBO_ATTRIB_MAX ; i++) {
 173       if (attrsz[i]) {
 174          la[nr].target = i;
 175          la[nr].sz = attrsz[i];
 176          la[nr].func = vert_attrfunc[attrsz[i]-1];
 177          nr++;
 178       }
 179    }
 180
 181    for (i = 0 ; i < prim_count ; i++) {
 182       if ((prim[i].mode & VBO_SAVE_PRIM_WEAK) &&
 183           (ctx->Driver.CurrentExecPrimitive != PRIM_OUTSIDE_BEGIN_END))
 184       {
 185          loopback_weak_prim( ctx, &prim[i] );
 186       }
 187       else
 188       {
 189          loopback_prim( ctx, buffer, &prim[i], wrap_count, vertex_size, la, nr );
 190       }
 191    }
 192 }
 193
 194
 195 #endif /* FEATURE_dlist */