reactos/dll/opengl/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 #include <precomp.h>
  29
  30 void vbo_exec_init( struct gl_context *ctx )
  31 {
  32    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
  33
  34    exec->ctx = ctx;
  35
  36    /* Initialize the arrayelt helper
  37     */
  38    if (!ctx->aelt_context &&
  39        !_ae_create_context( ctx ))
  40       return;
  41
  42    vbo_exec_vtx_init( exec );
  43    vbo_exec_array_init( exec );
  44
  45    /* Hook our functions into exec and compile dispatch tables.
  46     */
  47    _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt );
  48
  49    ctx->Driver.NeedFlush = 0;
  50    ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END;
  51    ctx->Driver.BeginVertices = vbo_exec_BeginVertices;
  52    ctx->Driver.FlushVertices = vbo_exec_FlushVertices;
  53
  54    vbo_exec_invalidate_state( ctx, ~0 );
  55 }
  56
  57
  58 void vbo_exec_destroy( struct gl_context *ctx )
  59 {
  60    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
  61
  62    if (ctx->aelt_context) {
  63       _ae_destroy_context( ctx );
  64       ctx->aelt_context = NULL;
  65    }
  66
  67    vbo_exec_vtx_destroy( exec );
  68    vbo_exec_array_destroy( exec );
  69 }
  70
  71
  72 /**
  73  * Really want to install these callbacks to a central facility to be
  74  * invoked according to the state flags.  That will have to wait for a
  75  * mesa rework:
  76  */
  77 void vbo_exec_invalidate_state( struct gl_context *ctx, GLuint new_state )
  78 {
  79    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
  80
  81    if (new_state & _NEW_EVAL)
  82       exec->eval.recalculate_maps = 1;
  83
  84    _ae_invalidate_state(ctx, new_state);
  85 }
  86
  87
  88 /**
  89  * Figure out the number of transform feedback primitives that will be output
  90  * by the given _mesa_prim command, assuming that no geometry shading is done
  91  * and primitive restart is not used.
  92  *
  93  * This is intended for use by driver back-ends in implementing the
  94  * PRIMITIVES_GENERATED and TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN queries.
  95  */
  96 size_t
  97 count_tessellated_primitives(const struct _mesa_prim *prim)
  98 {
  99    size_t num_primitives;
 100    switch (prim->mode) {
 101    case GL_POINTS:
 102       num_primitives = prim->count;
 103       break;
 104    case GL_LINE_STRIP:
 105       num_primitives = prim->count >= 2 ? prim->count - 1 : 0;
 106       break;
 107    case GL_LINE_LOOP:
 108       num_primitives = prim->count >= 2 ? prim->count : 0;
 109       break;
 110    case GL_LINES:
 111       num_primitives = prim->count / 2;
 112       break;
 113    case GL_TRIANGLE_STRIP:
 114    case GL_TRIANGLE_FAN:
 115    case GL_POLYGON:
 116       num_primitives = prim->count >= 3 ? prim->count - 2 : 0;
 117       break;
 118    case GL_TRIANGLES:
 119       num_primitives = prim->count / 3;
 120       break;
 121    case GL_QUAD_STRIP:
 122       num_primitives = prim->count >= 4 ? ((prim->count / 2) - 1) * 2 : 0;
 123       break;
 124    case GL_QUADS:
 125       num_primitives = (prim->count / 4) * 2;
 126       break;
 127    default:
 128       assert(!"Unexpected primitive type in count_tessellated_primitives");
 129       num_primitives = 0;
 130       break;
 131    }
 132    return num_primitives * prim->num_instances;
 133 }