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 "swrast_setup/swrast_setup.h"
  29 #include "swrast/swrast.h"
  30 #include "tnl/tnl.h"
  31 #include "context.h"
  32
  33 #include "vbo_context.h"
  34
  35 #include "glheader.h"
  36 #include "enums.h"
  37 #include "glapi.h"
  38 #include "imports.h"
  39 #include "macros.h"
  40 #include "mtypes.h"
  41 #include "dispatch.h"
  42
  43
  44 typedef void (*attr_func)( GLcontext *ctx, GLint target, const GLfloat * );
  45
  46
  47 /* This file makes heavy use of the aliasing of NV vertex attributes
  48  * with the legacy attributes, and also with ARB and Material
  49  * attributes as currently implemented.
  50  */
  51 static void VertexAttrib1fvNV(GLcontext *ctx, GLint target, const GLfloat *v)
  52 {
  53    CALL_VertexAttrib1fvNV(ctx->Exec, (target, v));
  54 }
  55
  56 static void VertexAttrib2fvNV(GLcontext *ctx, GLint target, const GLfloat *v)
  57 {
  58    CALL_VertexAttrib2fvNV(ctx->Exec, (target, v));
  59 }
  60
  61 static void VertexAttrib3fvNV(GLcontext *ctx, GLint target, const GLfloat *v)
  62 {
  63    CALL_VertexAttrib3fvNV(ctx->Exec, (target, v));
  64 }
  65
  66 static void VertexAttrib4fvNV(GLcontext *ctx, GLint target, const GLfloat *v)
  67 {
  68    CALL_VertexAttrib4fvNV(ctx->Exec, (target, v));
  69 }
  70
  71 static attr_func vert_attrfunc[4] = {
  72    VertexAttrib1fvNV,
  73    VertexAttrib2fvNV,
  74    VertexAttrib3fvNV,
  75    VertexAttrib4fvNV
  76 };
  77
  78 struct loopback_attr {
  79    GLint target;
  80    GLint sz;
  81    attr_func func;
  82 };
  83
  84 /* Don't emit ends and begins on wrapped primitives.  Don't replay
  85  * wrapped vertices.  If we get here, it's probably because the the
  86  * precalculated wrapping is wrong.
  87  */
  88 static void loopback_prim( GLcontext *ctx,
  89                            const GLfloat *buffer,
  90                            const struct _mesa_prim *prim,
  91                            GLuint wrap_count,
  92                            GLuint vertex_size,
  93                            const struct loopback_attr *la, GLuint nr )
  94 {
  95    GLint start = prim->start;
  96    GLint end = start + prim->count;
  97    const GLfloat *data;
  98    GLint j;
  99    GLuint k;
 100
 101    if (0)
 102       _mesa_printf("loopback prim %s(%s,%s) verts %d..%d\n",
 103                    _mesa_lookup_enum_by_nr(prim->mode),
 104                    prim->begin ? "begin" : "..",
 105                    prim->end ? "end" : "..",
 106                    start,
 107                    end);
 108
 109    if (prim->begin) {
 110       CALL_Begin(GET_DISPATCH(), ( prim->mode ));
 111    }
 112    else {
 113       assert(start == 0);
 114       start += wrap_count;
 115    }
 116
 117    data = buffer + start * vertex_size;
 118
 119    for (j = start ; j < end ; j++) {
 120       const GLfloat *tmp = data + la[0].sz;
 121
 122       for (k = 1 ; k < nr ; k++) {
 123          la[k].func( ctx, la[k].target, tmp );
 124          tmp += la[k].sz;
 125       }
 126
 127       /* Fire the vertex
 128        */
 129       la[0].func( ctx, VBO_ATTRIB_POS, data );
 130       data = tmp;
 131    }
 132
 133    if (prim->end) {
 134       CALL_End(GET_DISPATCH(), ());
 135    }
 136 }
 137
 138 /* Primitives generated by DrawArrays/DrawElements/Rectf may be
 139  * caught here.  If there is no primitive in progress, execute them
 140  * normally, otherwise need to track and discard the generated
 141  * primitives.
 142  */
 143 static void loopback_weak_prim( GLcontext *ctx,
 144                                 const struct _mesa_prim *prim )
 145 {
 146    /* Use the prim_weak flag to ensure that if this primitive
 147     * wraps, we don't mistake future vertex_lists for part of the
 148     * surrounding primitive.
 149     *
 150     * While this flag is set, we are simply disposing of data
 151     * generated by an operation now known to be a noop.
 152     */
 153    if (prim->begin)
 154       ctx->Driver.CurrentExecPrimitive |= VBO_SAVE_PRIM_WEAK;
 155    if (prim->end)
 156       ctx->Driver.CurrentExecPrimitive &= ~VBO_SAVE_PRIM_WEAK;
 157 }
 158
 159
 160 void vbo_loopback_vertex_list( GLcontext *ctx,
 161                                const GLfloat *buffer,
 162                                const GLubyte *attrsz,
 163                                const struct _mesa_prim *prim,
 164                                GLuint prim_count,
 165                                GLuint wrap_count,
 166                                GLuint vertex_size)
 167 {
 168    struct loopback_attr la[VBO_ATTRIB_MAX];
 169    GLuint i, nr = 0;
 170
 171    /* All Legacy, NV, ARB and Material attributes are routed through
 172     * the NV attributes entrypoints:
 173     */
 174    for (i = 0 ; i < VBO_ATTRIB_MAX ; i++) {
 175       if (attrsz[i]) {
 176          la[nr].target = i;
 177          la[nr].sz = attrsz[i];
 178          la[nr].func = vert_attrfunc[attrsz[i]-1];
 179          nr++;
 180       }
 181    }
 182
 183    for (i = 0 ; i < prim_count ; i++) {
 184       if ((prim[i].mode & VBO_SAVE_PRIM_WEAK) &&
 185           (ctx->Driver.CurrentExecPrimitive != PRIM_OUTSIDE_BEGIN_END))
 186       {
 187          loopback_weak_prim( ctx, &prim[i] );
 188       }
 189       else
 190       {
 191          loopback_prim( ctx, buffer, &prim[i], wrap_count, vertex_size, la, nr );
 192       }
 193    }
 194 }