src/mesa/vbo/vbo_save_loopback.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2005 VMware, Inc.
   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 VMWARE 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 <stdio.h>
  29 #include "main/context.h"
  30 #include "main/glheader.h"
  31 #include "main/enums.h"
  32 #include "main/imports.h"
  33 #include "main/mtypes.h"
  34 #include "main/dispatch.h"
  35 #include "glapi/glapi.h"
  36
  37 #include "vbo_context.h"
  38
  39
  40 typedef void (*attr_func)(struct gl_context *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
  48 VertexAttrib1fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  49 {
  50    CALL_VertexAttrib1fvNV(ctx->Exec, (target, v));
  51 }
  52
  53
  54 static void
  55 VertexAttrib2fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  56 {
  57    CALL_VertexAttrib2fvNV(ctx->Exec, (target, v));
  58 }
  59
  60
  61 static void
  62 VertexAttrib3fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  63 {
  64    CALL_VertexAttrib3fvNV(ctx->Exec, (target, v));
  65 }
  66
  67
  68 static void
  69 VertexAttrib4fvNV(struct gl_context *ctx, GLint target, const GLfloat *v)
  70 {
  71    CALL_VertexAttrib4fvNV(ctx->Exec, (target, v));
  72 }
  73
  74
  75 static attr_func vert_attrfunc[4] = {
  76    VertexAttrib1fvNV,
  77    VertexAttrib2fvNV,
  78    VertexAttrib3fvNV,
  79    VertexAttrib4fvNV
  80 };
  81
  82
  83 struct loopback_attr {
  84    GLint target;
  85    GLint sz;
  86    attr_func func;
  87 };
  88
  89
  90 /**
  91  * Don't emit ends and begins on wrapped primitives.  Don't replay
  92  * wrapped vertices.  If we get here, it's probably because the
  93  * precalculated wrapping is wrong.
  94  */
  95 static void
  96 loopback_prim(struct gl_context *ctx,
  97               const GLfloat *buffer,
  98               const struct _mesa_prim *prim,
  99               GLuint wrap_count,
 100               GLuint vertex_size,
 101               const struct loopback_attr *la, GLuint nr)
 102 {
 103    GLint start = prim->start;
 104    GLint end = start + prim->count;
 105    const GLfloat *data;
 106    GLint j;
 107    GLuint k;
 108
 109    if (0)
 110       printf("loopback prim %s(%s,%s) verts %d..%d\n",
 111              _mesa_lookup_prim_by_nr(prim->mode),
 112              prim->begin ? "begin" : "..",
 113              prim->end ? "end" : "..",
 114              start, end);
 115
 116    if (prim->begin) {
 117       CALL_Begin(GET_DISPATCH(), (prim->mode));
 118    }
 119    else {
 120       assert(start == 0);
 121       start += wrap_count;
 122    }
 123
 124    data = buffer + start * vertex_size;
 125
 126    for (j = start; j < end; j++) {
 127       const GLfloat *tmp = data + la[0].sz;
 128
 129       for (k = 1; k < nr; k++) {
 130          la[k].func(ctx, la[k].target, tmp);
 131          tmp += la[k].sz;
 132       }
 133
 134       /* Fire the vertex
 135        */
 136       la[0].func(ctx, VBO_ATTRIB_POS, data);
 137       data = tmp;
 138    }
 139
 140    if (prim->end) {
 141       CALL_End(GET_DISPATCH(), ());
 142    }
 143 }
 144
 145
 146 /**
 147  * Primitives generated by DrawArrays/DrawElements/Rectf may be
 148  * caught here.  If there is no primitive in progress, execute them
 149  * normally, otherwise need to track and discard the generated
 150  * primitives.
 151  */
 152 static void
 153 loopback_weak_prim(struct gl_context *ctx,
 154                    const struct _mesa_prim *prim)
 155 {
 156    /* Use the prim_weak flag to ensure that if this primitive
 157     * wraps, we don't mistake future vertex_lists for part of the
 158     * surrounding primitive.
 159     *
 160     * While this flag is set, we are simply disposing of data
 161     * generated by an operation now known to be a noop.
 162     */
 163    if (prim->begin)
 164       ctx->Driver.CurrentExecPrimitive |= VBO_SAVE_PRIM_WEAK;
 165    if (prim->end)
 166       ctx->Driver.CurrentExecPrimitive &= ~VBO_SAVE_PRIM_WEAK;
 167 }
 168
 169
 170 void
 171 vbo_loopback_vertex_list(struct gl_context *ctx,
 172                          const GLfloat *buffer,
 173                          const GLubyte *attrsz,
 174                          const struct _mesa_prim *prim,
 175                          GLuint prim_count,
 176                          GLuint wrap_count,
 177                          GLuint vertex_size)
 178 {
 179    struct loopback_attr la[VBO_ATTRIB_MAX];
 180    GLuint i, nr = 0;
 181
 182    /* All Legacy, NV, ARB and Material attributes are routed through
 183     * the NV attributes entrypoints:
 184     */
 185    for (i = 0; i < VBO_ATTRIB_MAX; i++) {
 186       if (attrsz[i]) {
 187          la[nr].target = i;
 188          la[nr].sz = attrsz[i];
 189          la[nr].func = vert_attrfunc[attrsz[i]-1];
 190          nr++;
 191       }
 192    }
 193
 194    for (i = 0; i < prim_count; i++) {
 195       if ((prim[i].mode & VBO_SAVE_PRIM_WEAK) &&
 196           _mesa_inside_begin_end(ctx)) {
 197          loopback_weak_prim(ctx, &prim[i]);
 198       } else {
 199          loopback_prim(ctx, buffer, &prim[i], wrap_count, vertex_size, la, nr);
 200       }
 201    }
 202 }