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 typedef void (*attr_func)( struct gl_context *ctx, GLint target, const GLfloat * );
  40
  41
  42 /* This file makes heavy use of the aliasing of NV vertex attributes
  43  * with the legacy attributes, and also with ARB and Material
  44  * attributes as currently implemented.
  45  */
  46 static void VertexAttrib1fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  47 {
  48    CALL_VertexAttrib1fvNV(ctx->Exec, (target, v));
  49 }
  50
  51 static void VertexAttrib2fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  52 {
  53    CALL_VertexAttrib2fvNV(ctx->Exec, (target, v));
  54 }
  55
  56 static void VertexAttrib3fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  57 {
  58    CALL_VertexAttrib3fvNV(ctx->Exec, (target, v));
  59 }
  60
  61 static void VertexAttrib4fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  62 {
  63    CALL_VertexAttrib4fvNV(ctx->Exec, (target, v));
  64 }
  65
  66 static attr_func vert_attrfunc[4] = {
  67    VertexAttrib1fvNV,
  68    VertexAttrib2fvNV,
  69    VertexAttrib3fvNV,
  70    VertexAttrib4fvNV
  71 };
  72
  73 struct loopback_attr {
  74    GLint target;
  75    GLint sz;
  76    attr_func func;
  77 };
  78
  79 /* Don't emit ends and begins on wrapped primitives.  Don't replay
  80  * wrapped vertices.  If we get here, it's probably because the
  81  * precalculated wrapping is wrong.
  82  */
  83 static void loopback_prim( struct gl_context *ctx,
  84                            const GLfloat *buffer,
  85                            const struct _mesa_prim *prim,
  86                            GLuint wrap_count,
  87                            GLuint vertex_size,
  88                            const struct loopback_attr *la, GLuint nr )
  89 {
  90    GLint start = prim->start;
  91    GLint end = start + prim->count;
  92    const GLfloat *data;
  93    GLint j;
  94    GLuint k;
  95
  96    if (0)
  97       printf("loopback prim %s(%s,%s) verts %d..%d\n",
  98              _mesa_lookup_prim_by_nr(prim->mode),
  99              prim->begin ? "begin" : "..",
 100              prim->end ? "end" : "..",
 101              start,
 102              end);
 103
 104    if (prim->begin) {
 105       CALL_Begin(GET_DISPATCH(), ( prim->mode ));
 106    }
 107    else {
 108       assert(start == 0);
 109       start += wrap_count;
 110    }
 111
 112    data = buffer + start * vertex_size;
 113
 114    for (j = start ; j < end ; j++) {
 115       const GLfloat *tmp = data + la[0].sz;
 116
 117       for (k = 1 ; k < nr ; k++) {
 118          la[k].func( ctx, la[k].target, tmp );
 119          tmp += la[k].sz;
 120       }
 121
 122       /* Fire the vertex
 123        */
 124       la[0].func( ctx, VBO_ATTRIB_POS, data );
 125       data = tmp;
 126    }
 127
 128    if (prim->end) {
 129       CALL_End(GET_DISPATCH(), ());
 130    }
 131 }
 132
 133 /* Primitives generated by DrawArrays/DrawElements/Rectf may be
 134  * caught here.  If there is no primitive in progress, execute them
 135  * normally, otherwise need to track and discard the generated
 136  * primitives.
 137  */
 138 static void loopback_weak_prim( struct gl_context *ctx,
 139                                 const struct _mesa_prim *prim )
 140 {
 141    /* Use the prim_weak flag to ensure that if this primitive
 142     * wraps, we don't mistake future vertex_lists for part of the
 143     * surrounding primitive.
 144     *
 145     * While this flag is set, we are simply disposing of data
 146     * generated by an operation now known to be a noop.
 147     */
 148    if (prim->begin)
 149       ctx->Driver.CurrentExecPrimitive |= VBO_SAVE_PRIM_WEAK;
 150    if (prim->end)
 151       ctx->Driver.CurrentExecPrimitive &= ~VBO_SAVE_PRIM_WEAK;
 152 }
 153
 154
 155 void vbo_loopback_vertex_list( struct gl_context *ctx,
 156                                const GLfloat *buffer,
 157                                const GLubyte *attrsz,
 158                                const struct _mesa_prim *prim,
 159                                GLuint prim_count,
 160                                GLuint wrap_count,
 161                                GLuint vertex_size)
 162 {
 163    struct loopback_attr la[VBO_ATTRIB_MAX];
 164    GLuint i, nr = 0;
 165
 166    /* All Legacy, NV, ARB and Material attributes are routed through
 167     * the NV attributes entrypoints:
 168     */
 169    for (i = 0 ; i < VBO_ATTRIB_MAX ; i++) {
 170       if (attrsz[i]) {
 171          la[nr].target = i;
 172          la[nr].sz = attrsz[i];
 173          la[nr].func = vert_attrfunc[attrsz[i]-1];
 174          nr++;
 175       }
 176    }
 177
 178    for (i = 0 ; i < prim_count ; i++) {
 179       if ((prim[i].mode & VBO_SAVE_PRIM_WEAK) &&
 180           _mesa_inside_begin_end(ctx))
 181       {
 182          loopback_weak_prim( ctx, &prim[i] );
 183       }
 184       else
 185       {
 186          loopback_prim( ctx, buffer, &prim[i], wrap_count, vertex_size, la, nr );
 187       }
 188    }
 189 }