| |
| /* |
| * 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 "main/glheader.h" |
| #include "main/imports.h" |
| #include "main/mtypes.h" |
| #include "main/macros.h" |
| |
| #include "vbo_split.h" |
| #include "vbo.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 ) |
| { |
| GLint max_basevertex = prim->basevertex; |
| GLuint i; |
| |
| for (i = 1; i < nr_prims; i++) |
| max_basevertex = MAX2(max_basevertex, prim[i].basevertex); |
| |
| /* XXX max_basevertex is computed but not used, why? */ |
| |
| 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); |
| } |
| } |
| } |
| |