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/* $Id: t_dd_dmatmp.h,v 1.1 2003-02-28 11:54:01 pj Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2001 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>
*/
/* Template for render stages which build and emit vertices directly
* to fixed-size dma buffers. Useful for rendering strips and other
* native primitives where clipping and per-vertex tweaks such as
* those in t_dd_tritmp.h are not required.
*
* Produces code for both inline triangles and indexed triangles.
* Where various primitive types are unaccelerated by hardware, the
* code attempts to fallback to other primitive types (quadstrips to
* tristrips, lineloops to linestrips), or to indexed vertices.
* Ultimately, a FALLBACK() macro is invoked if there is no way to
* render the primitive natively.
*/
#if !defined(HAVE_TRIANGLES)
#error "must have at least triangles to use render template"
#endif
#if !HAVE_ELTS
#define ELTS_VARS
#define ALLOC_ELTS( nr )
#define EMIT_ELT( offset, elt )
#define EMIT_TWO_ELTS( offset, elt0, elt1 )
#define INCR_ELTS( nr )
#define ELT_INIT(prim)
#define GET_CURRENT_VB_MAX_ELTS() 0
#define GET_SUBSEQUENT_VB_MAX_ELTS() 0
#define ALLOC_ELTS_NEW_PRIMITIVE(nr)
#define RELEASE_ELT_VERTS()
#define EMIT_INDEXED_VERTS( ctx, start, count )
#endif
#ifndef EMIT_TWO_ELTS
#define EMIT_TWO_ELTS( offset, elt0, elt1 ) \
do { \
EMIT_ELT( offset, elt0 ); \
EMIT_ELT( offset+1, elt1 ); \
} while (0)
#endif
#ifndef FINISH
#define FINISH
#endif
/**********************************************************************/
/* Render whole begin/end objects */
/**********************************************************************/
static GLboolean TAG(emit_elt_verts)( GLcontext *ctx,
GLuint start, GLuint count )
{
if (HAVE_ELTS) {
LOCAL_VARS;
GLuint nr = count - start;
if ( nr >= GET_SUBSEQUENT_VB_MAX_VERTS() ) /* assumes same packing for
* indexed and regualar verts
*/
return GL_FALSE;
NEW_PRIMITIVE(); /* finish last prim */
EMIT_INDEXED_VERTS( ctx, start, count );
return GL_TRUE;
} else {
return GL_FALSE;
}
}
#if (HAVE_ELTS)
static void TAG(emit_elts)( GLcontext *ctx, GLuint *elts, GLuint nr )
{
GLint i;
LOCAL_VARS;
ELTS_VARS;
ALLOC_ELTS( nr );
for ( i = 0 ; i < nr ; i+=2, elts += 2 ) {
EMIT_TWO_ELTS( 0, elts[0], elts[1] );
INCR_ELTS( 2 );
}
}
#endif
/***********************************************************************
* Render non-indexed primitives.
***********************************************************************/
static void TAG(render_points_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_POINTS) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
int currentsz = GET_CURRENT_VB_MAX_VERTS();
GLuint j, nr;
INIT( GL_POINTS );
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j < count; j += nr ) {
nr = MIN2( currentsz, count - j );
EMIT_VERTS( ctx, j, nr );
currentsz = dmasz;
}
FINISH;
} else {
VERT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_lines_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_LINES) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
int currentsz = GET_CURRENT_VB_MAX_VERTS();
GLuint j, nr;
INIT( GL_LINES );
/* Emit whole number of lines in total and in each buffer:
*/
count -= (count-start) & 1;
currentsz -= currentsz & 1;
dmasz -= dmasz & 1;
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j < count; j += nr ) {
nr = MIN2( currentsz, count - j );
EMIT_VERTS( ctx, j, nr );
currentsz = dmasz;
}
FINISH;
} else {
VERT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_line_strip_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_LINE_STRIPS) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
int currentsz = GET_CURRENT_VB_MAX_VERTS();
GLuint j, nr;
NEW_PRIMITIVE(); /* always a new primitive */
INIT( GL_LINE_STRIP );
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j + 1 < count; j += nr - 1 ) {
nr = MIN2( currentsz, count - j );
EMIT_VERTS( ctx, j, nr );
currentsz = dmasz;
}
FINISH;
} else {
VERT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_line_loop_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_LINE_STRIPS) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
int currentsz = GET_CURRENT_VB_MAX_VERTS();
GLuint j, nr;
NEW_PRIMITIVE();
INIT( GL_LINE_STRIP );
if (flags & PRIM_BEGIN)
j = start;
else
j = start + 1;
/* Ensure last vertex won't wrap buffers:
*/
currentsz--;
dmasz--;
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
if (j + 1 < count) {
for ( ; j + 1 < count; j += nr - 1 ) {
nr = MIN2( currentsz, count - j );
EMIT_VERTS( ctx, j, nr );
currentsz = dmasz;
}
if (start < count - 1 && (flags & PRIM_END))
EMIT_VERTS( ctx, start, 1 );
}
else if (start + 1 < count && (flags & PRIM_END)) {
EMIT_VERTS( ctx, start+1, 1 );
EMIT_VERTS( ctx, start, 1 );
}
FINISH;
} else {
VERT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_triangles_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
LOCAL_VARS;
int dmasz = (GET_SUBSEQUENT_VB_MAX_VERTS()/3) * 3;
int currentsz = (GET_CURRENT_VB_MAX_VERTS()/3) * 3;
GLuint j, nr;
INIT(GL_TRIANGLES);
/* Emit whole number of tris in total. dmasz is already a multiple
* of 3.
*/
count -= (count-start)%3;
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j < count; j += nr) {
nr = MIN2( currentsz, count - j );
EMIT_VERTS( ctx, j, nr );
currentsz = dmasz;
}
FINISH;
}
static void TAG(render_tri_strip_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_TRI_STRIPS) {
LOCAL_VARS;
GLuint j, nr;
int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
int currentsz;
INIT(GL_TRIANGLE_STRIP);
NEW_PRIMITIVE();
currentsz = GET_CURRENT_VB_MAX_VERTS();
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
if ((flags & PRIM_PARITY) && count - start > 2) {
if (HAVE_TRI_STRIP_1 && 0) {
} else {
EMIT_VERTS( ctx, start, 1 );
currentsz--;
}
}
/* From here on emit even numbers of tris when wrapping over buffers:
*/
dmasz -= (dmasz & 1);
currentsz -= (currentsz & 1);
for (j = start ; j + 2 < count; j += nr - 2 ) {
nr = MIN2( currentsz, count - j );
EMIT_VERTS( ctx, j, nr );
currentsz = dmasz;
}
FINISH;
} else {
VERT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_tri_fan_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_TRI_FANS) {
LOCAL_VARS;
GLuint j, nr;
int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
int currentsz = GET_CURRENT_VB_MAX_VERTS();
NEW_PRIMITIVE();
INIT(GL_TRIANGLE_FAN);
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
for (j = start + 1 ; j + 1 < count; j += nr - 1 ) {
nr = MIN2( currentsz, count - j + 1 );
EMIT_VERTS( ctx, start, 1 );
EMIT_VERTS( ctx, j, nr - 1 );
currentsz = dmasz;
}
FINISH;
}
else {
/* Could write code to emit these as indexed vertices (for the
* g400, for instance).
*/
VERT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_poly_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_POLYGONS) {
LOCAL_VARS;
GLuint j, nr;
int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
int currentsz = GET_CURRENT_VB_MAX_VERTS();
NEW_PRIMITIVE();
INIT(GL_POLYGON);
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
for (j = start + 1 ; j + 1 < count ; j += nr - 1 ) {
nr = MIN2( currentsz, count - j + 1 );
EMIT_VERTS( ctx, start, 1 );
EMIT_VERTS( ctx, j, nr - 1 );
currentsz = dmasz;
}
FINISH;
}
else if (HAVE_TRI_FANS && !(ctx->_TriangleCaps & DD_FLATSHADE)) {
TAG(render_tri_fan_verts)( ctx, start, count, flags );
} else {
VERT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_quad_strip_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint j, nr;
if (HAVE_QUAD_STRIPS) {
LOCAL_VARS;
GLuint j, nr;
int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
int currentsz;
INIT(GL_QUAD_STRIP);
NEW_PRIMITIVE();
currentsz = GET_CURRENT_VB_MAX_VERTS();
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
dmasz -= (dmasz & 2);
currentsz -= (currentsz & 2);
for (j = start ; j + 3 < count; j += nr - 2 ) {
nr = MIN2( currentsz, count - j );
EMIT_VERTS( ctx, j, nr );
currentsz = dmasz;
}
FINISH;
} else if (HAVE_TRI_STRIPS && (ctx->_TriangleCaps & DD_FLATSHADE)) {
if (TAG(emit_elt_verts)( ctx, start, count )) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
GLuint j, nr;
/* Simulate flat-shaded quadstrips using indexed vertices:
*/
NEW_PRIMITIVE();
ELT_INIT( GL_TRIANGLES );
currentsz = GET_CURRENT_VB_MAX_ELTS();
/* Emit whole number of quads in total, and in each buffer.
*/
dmasz -= dmasz & 1;
count -= (count-start) & 1;
currentsz -= currentsz & 1;
if (currentsz < 12)
currentsz = dmasz;
currentsz = currentsz/6*2;
dmasz = dmasz/6*2;
for (j = start; j + 3 < count; j += nr - 2 ) {
nr = MIN2( currentsz, count - j );
if (nr >= 4) {
GLint quads = (nr/2)-1;
GLint i;
ELTS_VARS;
NEW_PRIMITIVE();
ALLOC_ELTS_NEW_PRIMITIVE( quads*6 );
for ( i = j-start ; i < j-start+quads*2 ; i+=2 ) {
EMIT_TWO_ELTS( 0, (i+0), (i+1) );
EMIT_TWO_ELTS( 2, (i+2), (i+1) );
EMIT_TWO_ELTS( 4, (i+3), (i+2) );
INCR_ELTS( 6 );
}
NEW_PRIMITIVE();
}
currentsz = dmasz;
}
RELEASE_ELT_VERTS();
}
else {
/* Vertices won't fit in a single buffer or elts not available,
* VERT_FALLBACK.
*/
VERT_FALLBACK( ctx, start, count, flags );
}
}
else if (HAVE_TRI_STRIPS) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
int currentsz = GET_CURRENT_VB_MAX_VERTS();
/* Emit smooth-shaded quadstrips as tristrips:
*/
NEW_PRIMITIVE();
INIT( GL_TRIANGLE_STRIP );
/* Emit whole number of quads in total, and in each buffer.
*/
dmasz -= dmasz & 1;
currentsz -= currentsz & 1;
count -= (count-start) & 1;
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
for (j = start; j + 3 < count; j += nr - 2 ) {
nr = MIN2( currentsz, count - j );
EMIT_VERTS( ctx, j, nr );
currentsz = dmasz;
}
FINISH;
} else {
VERT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_quads_verts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_QUADS) {
LOCAL_VARS;
int dmasz = (GET_SUBSEQUENT_VB_MAX_VERTS()/4) * 4;
int currentsz = (GET_CURRENT_VB_MAX_VERTS()/4) * 4;
GLuint j, nr;
INIT(GL_QUADS);
/* Emit whole number of quads in total. dmasz is already a multiple
* of 4.
*/
count -= (count-start)%4;
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j < count; j += nr) {
nr = MIN2( currentsz, count - j );
EMIT_VERTS( ctx, j, nr );
currentsz = dmasz;
}
FINISH;
} else if (TAG(emit_elt_verts)( ctx, start, count )) {
/* Hardware doesn't have a quad primitive type -- try to
* simulate it using indexed vertices and the triangle
* primitive:
*/
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
GLuint j, nr;
NEW_PRIMITIVE();
ELT_INIT( GL_TRIANGLES );
currentsz = GET_CURRENT_VB_MAX_ELTS();
/* Emit whole number of quads in total, and in each buffer.
*/
dmasz -= dmasz & 3;
count -= (count-start) & 3;
currentsz -= currentsz & 3;
/* Adjust for rendering as triangles:
*/
currentsz = currentsz/6*4;
dmasz = dmasz/6*4;
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j < count; j += nr ) {
nr = MIN2( currentsz, count - j );
if (nr >= 4) {
GLint quads = nr/4;
GLint i;
ELTS_VARS;
NEW_PRIMITIVE();
ALLOC_ELTS_NEW_PRIMITIVE( quads*6 );
for ( i = j-start ; i < j-start+quads*4 ; i+=4 ) {
EMIT_TWO_ELTS( 0, (i+0), (i+1) );
EMIT_TWO_ELTS( 2, (i+3), (i+1) );
EMIT_TWO_ELTS( 4, (i+2), (i+3) );
INCR_ELTS( 6 );
}
NEW_PRIMITIVE();
}
currentsz = dmasz;
}
RELEASE_ELT_VERTS();
}
else {
/* Vertices won't fit in a single buffer, fallback.
*/
VERT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_noop)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
}
static render_func TAG(render_tab_verts)[GL_POLYGON+2] =
{
TAG(render_points_verts),
TAG(render_lines_verts),
TAG(render_line_loop_verts),
TAG(render_line_strip_verts),
TAG(render_triangles_verts),
TAG(render_tri_strip_verts),
TAG(render_tri_fan_verts),
TAG(render_quads_verts),
TAG(render_quad_strip_verts),
TAG(render_poly_verts),
TAG(render_noop),
};
/****************************************************************************
* Render elts using hardware indexed verts *
****************************************************************************/
#if (HAVE_ELTS)
static void TAG(render_points_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_POINTS) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
GLuint j, nr;
ELT_INIT( GL_POINTS );
currentsz = GET_CURRENT_VB_MAX_ELTS();
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j < count; j += nr ) {
nr = MIN2( currentsz, count - j );
TAG(emit_elts)( ctx, elts+j, nr );
NEW_PRIMITIVE();
currentsz = dmasz;
}
} else {
ELT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_lines_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_LINES) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
GLuint j, nr;
ELT_INIT( GL_LINES );
/* Emit whole number of lines in total and in each buffer:
*/
count -= (count-start) & 1;
currentsz -= currentsz & 1;
dmasz -= dmasz & 1;
currentsz = GET_CURRENT_VB_MAX_ELTS();
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j < count; j += nr ) {
nr = MIN2( currentsz, count - j );
TAG(emit_elts)( ctx, elts+j, nr );
NEW_PRIMITIVE();
currentsz = dmasz;
}
} else {
ELT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_line_strip_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_LINE_STRIPS) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
GLuint j, nr;
NEW_PRIMITIVE(); /* always a new primitive */
ELT_INIT( GL_LINE_STRIP );
currentsz = GET_CURRENT_VB_MAX_ELTS();
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j + 1 < count; j += nr - 1 ) {
nr = MIN2( currentsz, count - j );
TAG(emit_elts)( ctx, elts+j, nr );
NEW_PRIMITIVE();
currentsz = dmasz;
}
} else {
/* TODO: Try to emit as indexed lines.
*/
ELT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_line_loop_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_LINE_STRIPS) {
LOCAL_VARS;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
GLuint j, nr;
NEW_PRIMITIVE();
ELT_INIT( GL_LINE_STRIP );
if (flags & PRIM_BEGIN)
j = start;
else
j = start + 1;
currentsz = GET_CURRENT_VB_MAX_ELTS();
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
/* Ensure last vertex doesn't wrap:
*/
currentsz--;
dmasz--;
for ( ; j + 1 < count; j += nr - 1 ) {
nr = MIN2( currentsz, count - j );
/* NEW_PRIMITIVE(); */
TAG(emit_elts)( ctx, elts+j, nr );
currentsz = dmasz;
}
if (flags & PRIM_END)
TAG(emit_elts)( ctx, elts+start, 1 );
NEW_PRIMITIVE();
} else {
/* TODO: Try to emit as indexed lines */
ELT_FALLBACK( ctx, start, count, flags );
}
}
/* For verts, we still eliminate the copy from main memory to dma
* buffers. For elts, this is probably no better (worse?) than the
* standard path.
*/
static void TAG(render_triangles_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
LOCAL_VARS;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS()/3*3;
int currentsz;
GLuint j, nr;
NEW_PRIMITIVE();
ELT_INIT( GL_TRIANGLES );
currentsz = GET_CURRENT_VB_MAX_ELTS();
/* Emit whole number of tris in total. dmasz is already a multiple
* of 3.
*/
count -= (count-start)%3;
currentsz -= currentsz%3;
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j < count; j += nr) {
nr = MIN2( currentsz, count - j );
TAG(emit_elts)( ctx, elts+j, nr );
NEW_PRIMITIVE();
currentsz = dmasz;
}
}
static void TAG(render_tri_strip_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_TRI_STRIPS) {
LOCAL_VARS;
GLuint j, nr;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
NEW_PRIMITIVE();
ELT_INIT( GL_TRIANGLE_STRIP );
currentsz = GET_CURRENT_VB_MAX_ELTS();
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
if ((flags & PRIM_PARITY) && count - start > 2) {
TAG(emit_elts)( ctx, elts+start, 1 );
}
/* Keep the same winding over multiple buffers:
*/
dmasz -= (dmasz & 1);
currentsz -= (currentsz & 1);
for (j = start ; j + 2 < count; j += nr - 2 ) {
nr = MIN2( currentsz, count - j );
TAG(emit_elts)( ctx, elts+j, nr );
NEW_PRIMITIVE();
currentsz = dmasz;
}
} else {
/* TODO: try to emit as indexed triangles */
ELT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_tri_fan_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_TRI_FANS) {
LOCAL_VARS;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
GLuint j, nr;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
NEW_PRIMITIVE();
ELT_INIT( GL_TRIANGLE_FAN );
currentsz = GET_CURRENT_VB_MAX_ELTS();
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
for (j = start + 1 ; j + 1 < count; j += nr - 1 ) {
nr = MIN2( currentsz, count - j + 1 );
TAG(emit_elts)( ctx, elts+start, 1 );
TAG(emit_elts)( ctx, elts+j, nr - 1 );
NEW_PRIMITIVE();
currentsz = dmasz;
}
} else {
/* TODO: try to emit as indexed triangles */
ELT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_poly_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_POLYGONS && 0) {
} else if (HAVE_TRI_FANS && !(ctx->_TriangleCaps & DD_FLATSHADE)) {
LOCAL_VARS;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
GLuint j, nr;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
NEW_PRIMITIVE();
ELT_INIT( GL_TRIANGLE_FAN );
currentsz = GET_CURRENT_VB_MAX_ELTS();
if (currentsz < 8) {
NEW_BUFFER();
currentsz = dmasz;
}
for (j = start + 1 ; j + 1 < count ; j += nr - 1 ) {
nr = MIN2( currentsz, count - j + 1 );
TAG(emit_elts)( ctx, elts+start, 1 );
TAG(emit_elts)( ctx, elts+j, nr - 1 );
NEW_PRIMITIVE();
currentsz = dmasz;
}
} else {
ELT_FALLBACK( ctx, start, count, flags );
}
}
static void TAG(render_quad_strip_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_QUAD_STRIPS && 0) {
}
else if (HAVE_TRI_STRIPS) {
LOCAL_VARS;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
GLuint j, nr;
NEW_PRIMITIVE();
currentsz = GET_CURRENT_VB_MAX_ELTS();
/* Emit whole number of quads in total, and in each buffer.
*/
dmasz -= dmasz & 1;
count -= (count-start) & 1;
currentsz -= currentsz & 1;
if (currentsz < 12)
currentsz = dmasz;
if (ctx->_TriangleCaps & DD_FLATSHADE) {
ELT_INIT( GL_TRIANGLES );
currentsz = currentsz/6*2;
dmasz = dmasz/6*2;
for (j = start; j + 3 < count; j += nr - 2 ) {
nr = MIN2( currentsz, count - j );
if (nr >= 4)
{
GLint i;
GLint quads = (nr/2)-1;
ELTS_VARS;
NEW_PRIMITIVE();
ALLOC_ELTS_NEW_PRIMITIVE( quads*6 );
for ( i = j-start ; i < j-start+quads ; i++, elts += 2 ) {
EMIT_TWO_ELTS( 0, elts[0], elts[1] );
EMIT_TWO_ELTS( 2, elts[2], elts[1] );
EMIT_TWO_ELTS( 4, elts[3], elts[2] );
INCR_ELTS( 6 );
}
NEW_PRIMITIVE();
}
currentsz = dmasz;
}
}
else {
ELT_INIT( GL_TRIANGLE_STRIP );
for (j = start; j + 3 < count; j += nr - 2 ) {
nr = MIN2( currentsz, count - j );
TAG(emit_elts)( ctx, elts+j, nr );
NEW_PRIMITIVE();
currentsz = dmasz;
}
}
}
}
static void TAG(render_quads_elts)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
if (HAVE_QUADS && 0) {
} else {
LOCAL_VARS;
GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
int currentsz;
GLuint j, nr;
ELT_INIT( GL_TRIANGLES );
currentsz = GET_CURRENT_VB_MAX_ELTS();
/* Emit whole number of quads in total, and in each buffer.
*/
dmasz -= dmasz & 3;
count -= (count-start) & 3;
currentsz -= currentsz & 3;
/* Adjust for rendering as triangles:
*/
currentsz = currentsz/6*4;
dmasz = dmasz/6*4;
if (currentsz < 8)
currentsz = dmasz;
for (j = start; j + 3 < count; j += nr - 2 ) {
nr = MIN2( currentsz, count - j );
if (nr >= 4)
{
GLint quads = nr/4;
GLint i;
ELTS_VARS;
NEW_PRIMITIVE();
ALLOC_ELTS_NEW_PRIMITIVE( quads * 6 );
for ( i = j-start ; i < j-start+quads ; i++, elts += 4 ) {
EMIT_TWO_ELTS( 0, elts[0], elts[1] );
EMIT_TWO_ELTS( 2, elts[3], elts[1] );
EMIT_TWO_ELTS( 4, elts[2], elts[3] );
INCR_ELTS( 6 );
}
}
NEW_PRIMITIVE();
currentsz = dmasz;
}
}
}
static render_func TAG(render_tab_elts)[GL_POLYGON+2] =
{
TAG(render_points_elts),
TAG(render_lines_elts),
TAG(render_line_loop_elts),
TAG(render_line_strip_elts),
TAG(render_triangles_elts),
TAG(render_tri_strip_elts),
TAG(render_tri_fan_elts),
TAG(render_quads_elts),
TAG(render_quad_strip_elts),
TAG(render_poly_elts),
TAG(render_noop),
};
#endif