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      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 (at) 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_ARRAY)) {
     89       exec->array.recalculate_inputs = GL_TRUE;
     90    }
     91 
     92    if (new_state & (_NEW_PROGRAM|_NEW_EVAL))
     93       exec->eval.recalculate_maps = 1;
     94 
     95    _ae_invalidate_state(ctx, new_state);
     96 }
     97 
     98 
     99 /**
    100  * Figure out the number of transform feedback primitives that will be output
    101  * by the given _mesa_prim command, assuming that no geometry shading is done
    102  * and primitive restart is not used.
    103  *
    104  * This is intended for use by driver back-ends in implementing the
    105  * PRIMITIVES_GENERATED and TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN queries.
    106  */
    107 size_t
    108 count_tessellated_primitives(const struct _mesa_prim *prim)
    109 {
    110    size_t num_primitives;
    111    switch (prim->mode) {
    112    case GL_POINTS:
    113       num_primitives = prim->count;
    114       break;
    115    case GL_LINE_STRIP:
    116       num_primitives = prim->count >= 2 ? prim->count - 1 : 0;
    117       break;
    118    case GL_LINE_LOOP:
    119       num_primitives = prim->count >= 2 ? prim->count : 0;
    120       break;
    121    case GL_LINES:
    122       num_primitives = prim->count / 2;
    123       break;
    124    case GL_TRIANGLE_STRIP:
    125    case GL_TRIANGLE_FAN:
    126    case GL_POLYGON:
    127       num_primitives = prim->count >= 3 ? prim->count - 2 : 0;
    128       break;
    129    case GL_TRIANGLES:
    130       num_primitives = prim->count / 3;
    131       break;
    132    case GL_QUAD_STRIP:
    133       num_primitives = prim->count >= 4 ? ((prim->count / 2) - 1) * 2 : 0;
    134       break;
    135    case GL_QUADS:
    136       num_primitives = (prim->count / 4) * 2;
    137       break;
    138    default:
    139       assert(!"Unexpected primitive type in count_tessellated_primitives");
    140       num_primitives = 0;
    141       break;
    142    }
    143    return num_primitives * prim->num_instances;
    144 }
    145