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
  40 typedef void (*attr_func)( GLcontext *ctx, GLint target, const GLfloat * );
  41
  42
  43 /* This file makes heavy use of the aliasing of NV vertex attributes
  44  * with the legacy attributes, and also with ARB and Material
  45  * attributes as currently implemented.
  46  */
  47 static void VertexAttrib1fvNV(GLcontext *ctx, GLint target, const GLfloat *v)
  48 {
  49    CALL_VertexAttrib1fvNV(ctx->Exec, (target, v));
  50 }
  51
  52 static void VertexAttrib2fvNV(GLcontext *ctx, GLint target, const GLfloat *v)
  53 {
  54    CALL_VertexAttrib2fvNV(ctx->Exec, (target, v));
  55 }
  56
  57 static void VertexAttrib3fvNV(GLcontext *ctx, GLint target, const GLfloat *v)
  58 {
  59    CALL_VertexAttrib3fvNV(ctx->Exec, (target, v));
  60 }
  61
  62 static void VertexAttrib4fvNV(GLcontext *ctx, GLint target, const GLfloat *v)
  63 {
  64    CALL_VertexAttrib4fvNV(ctx->Exec, (target, v));
  65 }
  66
  67 static attr_func vert_attrfunc[4] = {
  68    VertexAttrib1fvNV,
  69    VertexAttrib2fvNV,
  70    VertexAttrib3fvNV,
  71    VertexAttrib4fvNV
  72 };
  73
  74 struct loopback_attr {
  75    GLint target;
  76    GLint sz;
  77    attr_func func;
  78 };
  79
  80 /* Don't emit ends and begins on wrapped primitives.  Don't replay
  81  * wrapped vertices.  If we get here, it's probably because the
  82  * precalculated wrapping is wrong.
  83  */
  84 static void loopback_prim( GLcontext *ctx,
  85                            const GLfloat *buffer,
  86                            const struct _mesa_prim *prim,
  87                            GLuint wrap_count,
  88                            GLuint vertex_size,
  89                            const struct loopback_attr *la, GLuint nr )
  90 {
  91    GLint start = prim->start;
  92    GLint end = start + prim->count;
  93    const GLfloat *data;
  94    GLint j;
  95    GLuint k;
  96
  97    if (0)
  98       printf("loopback prim %s(%s,%s) verts %d..%d\n",
  99              _mesa_lookup_prim_by_nr(prim->mode),
 100              prim->begin ? "begin" : "..",
 101              prim->end ? "end" : "..",
 102              start,
 103              end);
 104
 105    if (prim->begin) {
 106       CALL_Begin(GET_DISPATCH(), ( prim->mode ));
 107    }
 108    else {
 109       assert(start == 0);
 110       start += wrap_count;
 111    }
 112
 113    data = buffer + start * vertex_size;
 114
 115    for (j = start ; j < end ; j++) {
 116       const GLfloat *tmp = data + la[0].sz;
 117
 118       for (k = 1 ; k < nr ; k++) {
 119          la[k].func( ctx, la[k].target, tmp );
 120          tmp += la[k].sz;
 121       }
 122
 123       /* Fire the vertex
 124        */
 125       la[0].func( ctx, VBO_ATTRIB_POS, data );
 126       data = tmp;
 127    }
 128
 129    if (prim->end) {
 130       CALL_End(GET_DISPATCH(), ());
 131    }
 132 }
 133
 134 /* Primitives generated by DrawArrays/DrawElements/Rectf may be
 135  * caught here.  If there is no primitive in progress, execute them
 136  * normally, otherwise need to track and discard the generated
 137  * primitives.
 138  */
 139 static void loopback_weak_prim( GLcontext *ctx,
 140                                 const struct _mesa_prim *prim )
 141 {
 142    /* Use the prim_weak flag to ensure that if this primitive
 143     * wraps, we don't mistake future vertex_lists for part of the
 144     * surrounding primitive.
 145     *
 146     * While this flag is set, we are simply disposing of data
 147     * generated by an operation now known to be a noop.
 148     */
 149    if (prim->begin)
 150       ctx->Driver.CurrentExecPrimitive |= VBO_SAVE_PRIM_WEAK;
 151    if (prim->end)
 152       ctx->Driver.CurrentExecPrimitive &= ~VBO_SAVE_PRIM_WEAK;
 153 }
 154
 155
 156 void vbo_loopback_vertex_list( GLcontext *ctx,
 157                                const GLfloat *buffer,
 158                                const GLubyte *attrsz,
 159                                const struct _mesa_prim *prim,
 160                                GLuint prim_count,
 161                                GLuint wrap_count,
 162                                GLuint vertex_size)
 163 {
 164    struct loopback_attr la[VBO_ATTRIB_MAX];
 165    GLuint i, nr = 0;
 166
 167    /* All Legacy, NV, ARB and Material attributes are routed through
 168     * the NV attributes entrypoints:
 169     */
 170    for (i = 0 ; i < VBO_ATTRIB_MAX ; i++) {
 171       if (attrsz[i]) {
 172          la[nr].target = i;
 173          la[nr].sz = attrsz[i];
 174          la[nr].func = vert_attrfunc[attrsz[i]-1];
 175          nr++;
 176       }
 177    }
 178
 179    for (i = 0 ; i < prim_count ; i++) {
 180       if ((prim[i].mode & VBO_SAVE_PRIM_WEAK) &&
 181           (ctx->Driver.CurrentExecPrimitive != PRIM_OUTSIDE_BEGIN_END))
 182       {
 183          loopback_weak_prim( ctx, &prim[i] );
 184       }
 185       else
 186       {
 187          loopback_prim( ctx, buffer, &prim[i], wrap_count, vertex_size, la, nr );
 188       }
 189    }
 190 }