mirror of
https://github.com/reactos/reactos.git
synced 2024-08-19 18:02:55 +00:00
155 lines
4.9 KiB
C
155 lines
4.9 KiB
C
|
|
/*
|
|
* Mesa 3-D graphics library
|
|
* Version: 6.5
|
|
*
|
|
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
|
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* Authors:
|
|
* Keith Whitwell <keith@tungstengraphics.com>
|
|
*/
|
|
|
|
/* Deal with hardware and/or swtnl maximums:
|
|
* - maximum number of vertices in buffer
|
|
* - maximum number of elements (maybe zero)
|
|
*
|
|
* The maximums may vary with opengl state (eg if a larger hardware
|
|
* vertex is required in this state, the maximum number of vertices
|
|
* may be smaller than in another state).
|
|
*
|
|
* We want buffer splitting to be a convenience function for the code
|
|
* actually drawing the primitives rather than a system-wide maximum,
|
|
* otherwise it is hard to avoid pessimism.
|
|
*
|
|
* For instance, if a driver has no hardware limits on vertex buffer
|
|
* dimensions, it would not ordinarily want to split vbos. But if
|
|
* there is an unexpected fallback, eg memory manager fails to upload
|
|
* textures, it will want to pass the drawing commands onto swtnl,
|
|
* which does have limitations. A convenience function allows swtnl
|
|
* to split the drawing and vbos internally without imposing its
|
|
* limitations on drivers which want to use it as a fallback path.
|
|
*/
|
|
|
|
#include <precomp.h>
|
|
|
|
/* True if a primitive can be split without copying of vertices, false
|
|
* otherwise.
|
|
*/
|
|
GLboolean split_prim_inplace(GLenum mode, GLuint *first, GLuint *incr)
|
|
{
|
|
switch (mode) {
|
|
case GL_POINTS:
|
|
*first = 1;
|
|
*incr = 1;
|
|
return GL_TRUE;
|
|
case GL_LINES:
|
|
*first = 2;
|
|
*incr = 2;
|
|
return GL_TRUE;
|
|
case GL_LINE_STRIP:
|
|
*first = 2;
|
|
*incr = 1;
|
|
return GL_TRUE;
|
|
case GL_TRIANGLES:
|
|
*first = 3;
|
|
*incr = 3;
|
|
return GL_TRUE;
|
|
case GL_TRIANGLE_STRIP:
|
|
*first = 3;
|
|
*incr = 1;
|
|
return GL_TRUE;
|
|
case GL_QUADS:
|
|
*first = 4;
|
|
*incr = 4;
|
|
return GL_TRUE;
|
|
case GL_QUAD_STRIP:
|
|
*first = 4;
|
|
*incr = 2;
|
|
return GL_TRUE;
|
|
default:
|
|
*first = 0;
|
|
*incr = 1; /* so that count % incr works */
|
|
return GL_FALSE;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void vbo_split_prims( struct gl_context *ctx,
|
|
const struct gl_client_array *arrays[],
|
|
const struct _mesa_prim *prim,
|
|
GLuint nr_prims,
|
|
const struct _mesa_index_buffer *ib,
|
|
GLuint min_index,
|
|
GLuint max_index,
|
|
vbo_draw_func draw,
|
|
const struct split_limits *limits )
|
|
{
|
|
if (ib) {
|
|
if (limits->max_indices == 0) {
|
|
/* Could traverse the indices, re-emitting vertices in turn.
|
|
* But it's hard to see why this case would be needed - for
|
|
* software tnl, it is better to convert to non-indexed
|
|
* rendering after transformation is complete. Are there any devices
|
|
* with hardware tnl that cannot do indexed rendering?
|
|
*
|
|
* For now, this path is disabled.
|
|
*/
|
|
assert(0);
|
|
}
|
|
else if (max_index - min_index >= limits->max_verts) {
|
|
/* The vertex buffers are too large for hardware (or the
|
|
* swtnl module). Traverse the indices, re-emitting vertices
|
|
* in turn. Use a vertex cache to preserve some of the
|
|
* sharing from the original index list.
|
|
*/
|
|
vbo_split_copy(ctx, arrays, prim, nr_prims, ib,
|
|
draw, limits );
|
|
}
|
|
else if (ib->count > limits->max_indices) {
|
|
/* The index buffer is too large for hardware. Try to split
|
|
* on whole-primitive boundaries, otherwise try to split the
|
|
* individual primitives.
|
|
*/
|
|
vbo_split_inplace(ctx, arrays, prim, nr_prims, ib,
|
|
min_index, max_index, draw, limits );
|
|
}
|
|
else {
|
|
/* Why were we called? */
|
|
assert(0);
|
|
}
|
|
}
|
|
else {
|
|
if (max_index - min_index >= limits->max_verts) {
|
|
/* The vertex buffer is too large for hardware (or the swtnl
|
|
* module). Try to split on whole-primitive boundaries,
|
|
* otherwise try to split the individual primitives.
|
|
*/
|
|
vbo_split_inplace(ctx, arrays, prim, nr_prims, ib,
|
|
min_index, max_index, draw, limits );
|
|
}
|
|
else {
|
|
/* Why were we called? */
|
|
assert(0);
|
|
}
|
|
}
|
|
}
|
|
|