reactos/dll/opengl/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 <precomp.h>
  29
  30 #if FEATURE_dlist
  31
  32
  33 typedef void (*attr_func)( struct gl_context *ctx, GLint target, const GLfloat * );
  34
  35
  36 /* This file makes heavy use of the aliasing of NV vertex attributes
  37  * with the legacy attributes, and also with ARB and Material
  38  * attributes as currently implemented.
  39  */
  40 static void VertexAttrib1fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  41 {
  42    CALL_VertexAttrib1fvNV(ctx->Exec, (target, v));
  43 }
  44
  45 static void VertexAttrib2fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  46 {
  47    CALL_VertexAttrib2fvNV(ctx->Exec, (target, v));
  48 }
  49
  50 static void VertexAttrib3fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  51 {
  52    CALL_VertexAttrib3fvNV(ctx->Exec, (target, v));
  53 }
  54
  55 static void VertexAttrib4fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  56 {
  57    CALL_VertexAttrib4fvNV(ctx->Exec, (target, v));
  58 }
  59
  60 static attr_func vert_attrfunc[4] = {
  61    VertexAttrib1fvNV,
  62    VertexAttrib2fvNV,
  63    VertexAttrib3fvNV,
  64    VertexAttrib4fvNV
  65 };
  66
  67 struct loopback_attr {
  68    GLint target;
  69    GLint sz;
  70    attr_func func;
  71 };
  72
  73 /* Don't emit ends and begins on wrapped primitives.  Don't replay
  74  * wrapped vertices.  If we get here, it's probably because the
  75  * precalculated wrapping is wrong.
  76  */
  77 static void loopback_prim( struct gl_context *ctx,
  78                            const GLfloat *buffer,
  79                            const struct _mesa_prim *prim,
  80                            GLuint wrap_count,
  81                            GLuint vertex_size,
  82                            const struct loopback_attr *la, GLuint nr )
  83 {
  84    GLint start = prim->start;
  85    GLint end = start + prim->count;
  86    const GLfloat *data;
  87    GLint j;
  88    GLuint k;
  89
  90    if (0)
  91       printf("loopback prim %s(%s,%s) verts %d..%d\n",
  92              _mesa_lookup_prim_by_nr(prim->mode),
  93              prim->begin ? "begin" : "..",
  94              prim->end ? "end" : "..",
  95              start,
  96              end);
  97
  98    if (prim->begin) {
  99       CALL_Begin(GET_DISPATCH(), ( prim->mode ));
 100    }
 101    else {
 102       assert(start == 0);
 103       start += wrap_count;
 104    }
 105
 106    data = buffer + start * vertex_size;
 107
 108    for (j = start ; j < end ; j++) {
 109       const GLfloat *tmp = data + la[0].sz;
 110
 111       for (k = 1 ; k < nr ; k++) {
 112          la[k].func( ctx, la[k].target, tmp );
 113          tmp += la[k].sz;
 114       }
 115
 116       /* Fire the vertex
 117        */
 118       la[0].func( ctx, VBO_ATTRIB_POS, data );
 119       data = tmp;
 120    }
 121
 122    if (prim->end) {
 123       CALL_End(GET_DISPATCH(), ());
 124    }
 125 }
 126
 127 /* Primitives generated by DrawArrays/DrawElements/Rectf may be
 128  * caught here.  If there is no primitive in progress, execute them
 129  * normally, otherwise need to track and discard the generated
 130  * primitives.
 131  */
 132 static void loopback_weak_prim( struct gl_context *ctx,
 133                                 const struct _mesa_prim *prim )
 134 {
 135    /* Use the prim_weak flag to ensure that if this primitive
 136     * wraps, we don't mistake future vertex_lists for part of the
 137     * surrounding primitive.
 138     *
 139     * While this flag is set, we are simply disposing of data
 140     * generated by an operation now known to be a noop.
 141     */
 142    if (prim->begin)
 143       ctx->Driver.CurrentExecPrimitive |= VBO_SAVE_PRIM_WEAK;
 144    if (prim->end)
 145       ctx->Driver.CurrentExecPrimitive &= ~VBO_SAVE_PRIM_WEAK;
 146 }
 147
 148
 149 void vbo_loopback_vertex_list( struct gl_context *ctx,
 150                                const GLfloat *buffer,
 151                                const GLubyte *attrsz,
 152                                const struct _mesa_prim *prim,
 153                                GLuint prim_count,
 154                                GLuint wrap_count,
 155                                GLuint vertex_size)
 156 {
 157    struct loopback_attr la[VBO_ATTRIB_MAX];
 158    GLuint i, nr = 0;
 159
 160    /* All Legacy, NV, ARB and Material attributes are routed through
 161     * the NV attributes entrypoints:
 162     */
 163    for (i = 0 ; i < VBO_ATTRIB_MAX ; i++) {
 164       if (attrsz[i]) {
 165          la[nr].target = i;
 166          la[nr].sz = attrsz[i];
 167          la[nr].func = vert_attrfunc[attrsz[i]-1];
 168          nr++;
 169       }
 170    }
 171
 172    for (i = 0 ; i < prim_count ; i++) {
 173       if ((prim[i].mode & VBO_SAVE_PRIM_WEAK) &&
 174           (ctx->Driver.CurrentExecPrimitive != PRIM_OUTSIDE_BEGIN_END))
 175       {
 176          loopback_weak_prim( ctx, &prim[i] );
 177       }
 178       else
 179       {
 180          loopback_prim( ctx, buffer, &prim[i], wrap_count, vertex_size, la, nr );
 181       }
 182    }
 183 }
 184
 185
 186 #endif /* FEATURE_dlist */