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