reactos/dll/opengl/mesa/src/mesa/vbo/vbo_exec.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.3
   4  *
   5  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  */
  27
  28
  29 #include "main/api_arrayelt.h"
  30 #include "main/glheader.h"
  31 #include "main/mtypes.h"
  32 #include "main/vtxfmt.h"
  33 #include "vbo_context.h"
  34
  35
  36
  37 void vbo_exec_init( struct gl_context *ctx )
  38 {
  39    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
  40
  41    exec->ctx = ctx;
  42
  43    /* Initialize the arrayelt helper
  44     */
  45    if (!ctx->aelt_context &&
  46        !_ae_create_context( ctx ))
  47       return;
  48
  49    vbo_exec_vtx_init( exec );
  50    vbo_exec_array_init( exec );
  51
  52    /* Hook our functions into exec and compile dispatch tables.
  53     */
  54    _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt );
  55
  56    ctx->Driver.NeedFlush = 0;
  57    ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END;
  58    ctx->Driver.BeginVertices = vbo_exec_BeginVertices;
  59    ctx->Driver.FlushVertices = vbo_exec_FlushVertices;
  60
  61    vbo_exec_invalidate_state( ctx, ~0 );
  62 }
  63
  64
  65 void vbo_exec_destroy( struct gl_context *ctx )
  66 {
  67    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
  68
  69    if (ctx->aelt_context) {
  70       _ae_destroy_context( ctx );
  71       ctx->aelt_context = NULL;
  72    }
  73
  74    vbo_exec_vtx_destroy( exec );
  75    vbo_exec_array_destroy( exec );
  76 }
  77
  78
  79 /**
  80  * Really want to install these callbacks to a central facility to be
  81  * invoked according to the state flags.  That will have to wait for a
  82  * mesa rework:
  83  */
  84 void vbo_exec_invalidate_state( struct gl_context *ctx, GLuint new_state )
  85 {
  86    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
  87
  88    if (new_state & (_NEW_PROGRAM|_NEW_EVAL))
  89       exec->eval.recalculate_maps = 1;
  90
  91    _ae_invalidate_state(ctx, new_state);
  92 }
  93
  94
  95 /**
  96  * Figure out the number of transform feedback primitives that will be output
  97  * by the given _mesa_prim command, assuming that no geometry shading is done
  98  * and primitive restart is not used.
  99  *
 100  * This is intended for use by driver back-ends in implementing the
 101  * PRIMITIVES_GENERATED and TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN queries.
 102  */
 103 size_t
 104 count_tessellated_primitives(const struct _mesa_prim *prim)
 105 {
 106    size_t num_primitives;
 107    switch (prim->mode) {
 108    case GL_POINTS:
 109       num_primitives = prim->count;
 110       break;
 111    case GL_LINE_STRIP:
 112       num_primitives = prim->count >= 2 ? prim->count - 1 : 0;
 113       break;
 114    case GL_LINE_LOOP:
 115       num_primitives = prim->count >= 2 ? prim->count : 0;
 116       break;
 117    case GL_LINES:
 118       num_primitives = prim->count / 2;
 119       break;
 120    case GL_TRIANGLE_STRIP:
 121    case GL_TRIANGLE_FAN:
 122    case GL_POLYGON:
 123       num_primitives = prim->count >= 3 ? prim->count - 2 : 0;
 124       break;
 125    case GL_TRIANGLES:
 126       num_primitives = prim->count / 3;
 127       break;
 128    case GL_QUAD_STRIP:
 129       num_primitives = prim->count >= 4 ? ((prim->count / 2) - 1) * 2 : 0;
 130       break;
 131    case GL_QUADS:
 132       num_primitives = (prim->count / 4) * 2;
 133       break;
 134    default:
 135       assert(!"Unexpected primitive type in count_tessellated_primitives");
 136       num_primitives = 0;
 137       break;
 138    }
 139    return num_primitives * prim->num_instances;
 140 }