+++ /dev/null
-
-/*
- * 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);
- }
- }
-}
-
projects / reactos.git / blobdiff