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-rw-r--r--src/mesa/vbo/vbo_split_inplace.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/src/mesa/vbo/vbo_split_inplace.c b/src/mesa/vbo/vbo_split_inplace.c
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+++ b/src/mesa/vbo/vbo_split_inplace.c
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+
+/*
+ * 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 <[email protected]>
+ */
+
+
+#include "mtypes.h"
+#include "macros.h"
+#include "enums.h"
+#include "vbo_split.h"
+
+
+#define MAX_PRIM 32
+
+/* Used for splitting without copying.
+ */
+struct split_context {
+ GLcontext *ctx;
+ const struct gl_client_array **array;
+ 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;
+
+ struct _mesa_prim dstprim[MAX_PRIM];
+ GLuint dstprim_nr;
+};
+
+
+
+
+static void flush_vertex( struct split_context *split )
+{
+ GLint min_index, max_index;
+
+ if (!split->dstprim_nr)
+ return;
+
+ if (split->ib) {
+ /* This should basically be multipass rendering over the same
+ * unchanging set of VBO's. Would like the driver not to
+ * re-upload the data, or swtnl not to re-transform the
+ * vertices.
+ */
+ assert(split->max_index - split->min_index < split->limits->max_verts);
+ min_index = split->min_index;
+ max_index = split->max_index;
+ }
+ else {
+ /* Non-indexed rendering. Cannot assume that the primitives are
+ * ordered by increasing vertex, because of entrypoints like
+ * MultiDrawArrays.
+ */
+ GLuint i;
+ min_index = split->dstprim[0].start;
+ max_index = min_index + split->dstprim[0].count - 1;
+
+ for (i = 1; i < split->dstprim_nr; i++) {
+ GLuint tmp_min = split->dstprim[i].start;
+ GLuint tmp_max = tmp_min + split->dstprim[i].count - 1;
+
+ if (tmp_min < min_index)
+ min_index = tmp_min;
+
+ if (tmp_max > max_index)
+ max_index = tmp_max;
+ }
+ }
+
+ assert(max_index >= min_index);
+
+ split->draw( split->ctx,
+ split->array,
+ split->dstprim,
+ split->dstprim_nr,
+ NULL,
+ min_index,
+ max_index);
+
+ split->dstprim_nr = 0;
+}
+
+
+static struct _mesa_prim *next_outprim( struct split_context *split )
+{
+ if (split->dstprim_nr == MAX_PRIM-1) {
+ flush_vertex(split);
+ }
+
+ {
+ struct _mesa_prim *prim = &split->dstprim[split->dstprim_nr++];
+ memset(prim, 0, sizeof(*prim));
+ return prim;
+ }
+}
+
+static int align(int value, int alignment)
+{
+ return (value + alignment - 1) & ~(alignment - 1);
+}
+
+
+
+/* Break large primitives into smaller ones. If not possible, convert
+ * the primitive to indexed and pass to split_elts().
+ */
+static void split_prims( struct split_context *split)
+{
+ GLuint csr = 0;
+ GLuint i;
+
+ for (i = 0; i < split->nr_prims; i++) {
+ const struct _mesa_prim *prim = &split->prim[i];
+ GLuint first, incr;
+ GLboolean split_inplace = split_prim_inplace(prim->mode, &first, &incr);
+ GLuint count;
+
+ /* Always wrap on an even numbered vertex to avoid problems with
+ * triangle strips.
+ */
+ GLuint available = align(split->limits->max_verts - csr - 1, 2);
+ assert(split->limits->max_verts >= csr);
+
+ if (prim->count < first)
+ continue;
+
+ count = prim->count - (prim->count - first) % incr;
+
+
+ if ((available < count && !split_inplace) ||
+ (available < first && split_inplace)) {
+ flush_vertex(split);
+ csr = 0;
+ available = align(split->limits->max_verts - csr - 1, 2);
+ }
+
+ if (available >= count) {
+ struct _mesa_prim *outprim = next_outprim(split);
+ *outprim = *prim;
+ csr += prim->count;
+ available = align(split->limits->max_verts - csr - 1, 2);
+ }
+ else if (split_inplace) {
+ GLuint j, nr;
+
+
+ for (j = 0 ; j < count ; ) {
+ GLuint remaining = count - j;
+ struct _mesa_prim *outprim = next_outprim(split);
+
+ nr = MIN2( available, remaining );
+
+ nr -= (nr - first) % incr;
+
+ outprim->mode = prim->mode;
+ outprim->begin = (j == 0 && prim->begin);
+ outprim->end = (nr == remaining && prim->end);
+ outprim->start = prim->start + j;
+ outprim->count = nr;
+
+ if (nr == remaining) {
+ /* Finished.
+ */
+ j += nr;
+ csr += nr;
+ available = align(split->limits->max_verts - csr - 1, 2);
+ }
+ else {
+ /* Wrapped the primitive:
+ */
+ j += nr - (first - incr);
+ flush_vertex(split);
+ csr = 0;
+ available = align(split->limits->max_verts - csr - 1, 2);
+ }
+ }
+ }
+ else if (split->ib == NULL) {
+ /* XXX: could at least send the first max_verts off from the
+ * inplace buffers.
+ */
+
+ /* else convert to indexed primitive and pass to split_elts,
+ * which will do the necessary copying and turn it back into a
+ * vertex primitive for rendering...
+ */
+ struct _mesa_index_buffer ib;
+ struct _mesa_prim tmpprim;
+ GLuint *elts = malloc(count * sizeof(GLuint));
+ GLuint j;
+
+ for (j = 0; j < count; j++)
+ elts[j] = prim->start + j;
+
+ ib.count = count;
+ ib.type = GL_UNSIGNED_INT;
+ ib.obj = split->ctx->Array.NullBufferObj;
+ ib.ptr = elts;
+
+ tmpprim = *prim;
+ tmpprim.indexed = 1;
+ tmpprim.start = 0;
+ tmpprim.count = count;
+
+ flush_vertex(split);
+
+ vbo_split_copy(split->ctx,
+ split->array,
+ &tmpprim, 1,
+ &ib,
+ split->draw,
+ split->limits);
+
+ free(elts);
+ }
+ else {
+ flush_vertex(split);
+
+ vbo_split_copy(split->ctx,
+ split->array,
+ prim, 1,
+ split->ib,
+ split->draw,
+ split->limits);
+ }
+ }
+
+ flush_vertex(split);
+}
+
+
+void vbo_split_inplace( GLcontext *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 )
+{
+ struct split_context split;
+
+ memset(&split, 0, sizeof(split));
+
+ split.ctx = ctx;
+ split.array = arrays;
+ split.prim = prim;
+ split.nr_prims = nr_prims;
+ split.ib = ib;
+ split.min_index = min_index;
+ split.max_index = max_index;
+ split.draw = draw;
+ split.limits = limits;
+
+ split_prims( &split );
+}
+
+
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