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/* $Id: t_vb_rendertmp.h,v 1.1 2003-02-28 11:48:08 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>
*/
#ifndef POSTFIX
#define POSTFIX
#endif
#ifndef INIT
#define INIT(x)
#endif
#ifndef NEED_EDGEFLAG_SETUP
#define NEED_EDGEFLAG_SETUP 0
#define EDGEFLAG_GET(a) 0
#define EDGEFLAG_SET(a,b) (void)b
#endif
#ifndef RESET_STIPPLE
#define RESET_STIPPLE
#endif
#ifndef RESET_OCCLUSION
#define RESET_OCCLUSION
#endif
#ifndef TEST_PRIM_END
#define TEST_PRIM_END(flags) (flags & PRIM_END)
#define TEST_PRIM_BEGIN(flags) (flags & PRIM_BEGIN)
#define TEST_PRIM_PARITY(flags) (flags & PRIM_PARITY)
#endif
#ifndef ELT
#define ELT(x) x
#endif
#ifndef RENDER_TAB_QUALIFIER
#define RENDER_TAB_QUALIFIER static
#endif
static void TAG(render_points)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
LOCAL_VARS;
(void) flags;
RESET_OCCLUSION;
INIT(GL_POINTS);
RENDER_POINTS( start, count );
POSTFIX;
}
static void TAG(render_lines)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint j;
LOCAL_VARS;
(void) flags;
RESET_OCCLUSION;
INIT(GL_LINES);
for (j=start+1; j<count; j+=2 ) {
RESET_STIPPLE;
RENDER_LINE( ELT(j-1), ELT(j) );
}
POSTFIX;
}
static void TAG(render_line_strip)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint j;
LOCAL_VARS;
(void) flags;
RESET_OCCLUSION;
INIT(GL_LINE_STRIP);
if (TEST_PRIM_BEGIN(flags)) {
RESET_STIPPLE;
}
for (j=start+1; j<count; j++ )
RENDER_LINE( ELT(j-1), ELT(j) );
POSTFIX;
}
static void TAG(render_line_loop)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint i;
LOCAL_VARS;
(void) flags;
RESET_OCCLUSION;
INIT(GL_LINE_LOOP);
if (start+1 < count) {
if (TEST_PRIM_BEGIN(flags)) {
RESET_STIPPLE;
RENDER_LINE( ELT(start), ELT(start+1) );
}
for ( i = start+2 ; i < count ; i++) {
RENDER_LINE( ELT(i-1), ELT(i) );
}
if ( TEST_PRIM_END(flags)) {
RENDER_LINE( ELT(count-1), ELT(start) );
}
}
POSTFIX;
}
static void TAG(render_triangles)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint j;
LOCAL_VARS;
(void) flags;
INIT(GL_TRIANGLES);
if (NEED_EDGEFLAG_SETUP) {
for (j=start+2; j<count; j+=3) {
/* Leave the edgeflags as supplied by the user.
*/
RESET_STIPPLE;
RENDER_TRI( ELT(j-2), ELT(j-1), ELT(j) );
}
} else {
for (j=start+2; j<count; j+=3) {
RENDER_TRI( ELT(j-2), ELT(j-1), ELT(j) );
}
}
POSTFIX;
}
static void TAG(render_tri_strip)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint j;
GLuint parity = 0;
LOCAL_VARS;
if (TEST_PRIM_PARITY(flags))
parity = 1;
INIT(GL_TRIANGLE_STRIP);
if (NEED_EDGEFLAG_SETUP) {
for (j=start+2;j<count;j++,parity^=1) {
GLuint ej2 = ELT(j-2+parity);
GLuint ej1 = ELT(j-1-parity);
GLuint ej = ELT(j);
GLboolean ef2 = EDGEFLAG_GET( ej2 );
GLboolean ef1 = EDGEFLAG_GET( ej1 );
GLboolean ef = EDGEFLAG_GET( ej );
if (TEST_PRIM_BEGIN(flags)) {
RESET_STIPPLE;
}
EDGEFLAG_SET( ej2, GL_TRUE );
EDGEFLAG_SET( ej1, GL_TRUE );
EDGEFLAG_SET( ej, GL_TRUE );
RENDER_TRI( ej2, ej1, ej );
EDGEFLAG_SET( ej2, ef2 );
EDGEFLAG_SET( ej1, ef1 );
EDGEFLAG_SET( ej, ef );
}
} else {
for (j=start+2; j<count ; j++, parity^=1) {
RENDER_TRI( ELT(j-2+parity), ELT(j-1-parity), ELT(j) );
}
}
POSTFIX;
}
static void TAG(render_tri_fan)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint j;
LOCAL_VARS;
(void) flags;
INIT(GL_TRIANGLE_FAN);
if (NEED_EDGEFLAG_SETUP) {
for (j=start+2;j<count;j++) {
/* For trifans, all edges are boundary.
*/
GLuint ejs = ELT(start);
GLuint ej1 = ELT(j-1);
GLuint ej = ELT(j);
GLboolean efs = EDGEFLAG_GET( ejs );
GLboolean ef1 = EDGEFLAG_GET( ej1 );
GLboolean ef = EDGEFLAG_GET( ej );
if (TEST_PRIM_BEGIN(flags)) {
RESET_STIPPLE;
}
EDGEFLAG_SET( ejs, GL_TRUE );
EDGEFLAG_SET( ej1, GL_TRUE );
EDGEFLAG_SET( ej, GL_TRUE );
RENDER_TRI( ejs, ej1, ej);
EDGEFLAG_SET( ejs, efs );
EDGEFLAG_SET( ej1, ef1 );
EDGEFLAG_SET( ej, ef );
}
} else {
for (j=start+2;j<count;j++) {
RENDER_TRI( ELT(start), ELT(j-1), ELT(j) );
}
}
POSTFIX;
}
static void TAG(render_poly)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint j = start+2;
LOCAL_VARS;
(void) flags;
INIT(GL_POLYGON);
if (NEED_EDGEFLAG_SETUP) {
GLboolean efstart = EDGEFLAG_GET( ELT(start) );
GLboolean efcount = EDGEFLAG_GET( ELT(count-1) );
/* If the primitive does not begin here, the first edge
* is non-boundary.
*/
if (!TEST_PRIM_BEGIN(flags))
EDGEFLAG_SET( ELT(start), GL_FALSE );
else {
RESET_STIPPLE;
}
/* If the primitive does not end here, the final edge is
* non-boundary.
*/
if (!TEST_PRIM_END(flags))
EDGEFLAG_SET( ELT(count-1), GL_FALSE );
/* Draw the first triangles (possibly zero)
*/
if (j+1<count) {
GLboolean ef = EDGEFLAG_GET( ELT(j) );
EDGEFLAG_SET( ELT(j), GL_FALSE );
RENDER_TRI( ELT(j-1), ELT(j), ELT(start) );
EDGEFLAG_SET( ELT(j), ef );
j++;
/* Don't render the first edge again:
*/
EDGEFLAG_SET( ELT(start), GL_FALSE );
for (;j+1<count;j++) {
GLboolean efj = EDGEFLAG_GET( ELT(j) );
EDGEFLAG_SET( ELT(j), GL_FALSE );
RENDER_TRI( ELT(j-1), ELT(j), ELT(start) );
EDGEFLAG_SET( ELT(j), efj );
}
}
/* Draw the last or only triangle
*/
if (j < count)
RENDER_TRI( ELT(j-1), ELT(j), ELT(start) );
/* Restore the first and last edgeflags:
*/
EDGEFLAG_SET( ELT(count-1), efcount );
EDGEFLAG_SET( ELT(start), efstart );
}
else {
for (j=start+2;j<count;j++) {
RENDER_TRI( ELT(j-1), ELT(j), ELT(start) );
}
}
POSTFIX;
}
static void TAG(render_quads)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint j;
LOCAL_VARS;
(void) flags;
INIT(GL_QUADS);
if (NEED_EDGEFLAG_SETUP) {
for (j=start+3; j<count; j+=4) {
/* Use user-specified edgeflags for quads.
*/
RESET_STIPPLE;
RENDER_QUAD( ELT(j-3), ELT(j-2), ELT(j-1), ELT(j) );
}
} else {
for (j=start+3; j<count; j+=4) {
RENDER_QUAD( ELT(j-3), ELT(j-2), ELT(j-1), ELT(j) );
}
}
POSTFIX;
}
static void TAG(render_quad_strip)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
GLuint j;
LOCAL_VARS;
(void) flags;
INIT(GL_QUAD_STRIP);
if (NEED_EDGEFLAG_SETUP) {
for (j=start+3;j<count;j+=2) {
/* All edges are boundary. Set edgeflags to 1, draw the
* quad, and restore them to the original values.
*/
GLboolean ef3 = EDGEFLAG_GET( ELT(j-3) );
GLboolean ef2 = EDGEFLAG_GET( ELT(j-2) );
GLboolean ef1 = EDGEFLAG_GET( ELT(j-1) );
GLboolean ef = EDGEFLAG_GET( ELT(j) );
if (TEST_PRIM_BEGIN(flags)) {
RESET_STIPPLE;
}
EDGEFLAG_SET( ELT(j-3), GL_TRUE );
EDGEFLAG_SET( ELT(j-2), GL_TRUE );
EDGEFLAG_SET( ELT(j-1), GL_TRUE );
EDGEFLAG_SET( ELT(j), GL_TRUE );
RENDER_QUAD( ELT(j-1), ELT(j-3), ELT(j-2), ELT(j) );
EDGEFLAG_SET( ELT(j-3), ef3 );
EDGEFLAG_SET( ELT(j-2), ef2 );
EDGEFLAG_SET( ELT(j-1), ef1 );
EDGEFLAG_SET( ELT(j), ef );
}
} else {
for (j=start+3;j<count;j+=2) {
RENDER_QUAD( ELT(j-1), ELT(j-3), ELT(j-2), ELT(j) );
}
}
POSTFIX;
}
static void TAG(render_noop)( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
(void)(ctx && start && count && flags);
}
RENDER_TAB_QUALIFIER void (*TAG(render_tab)[GL_POLYGON+2])(GLcontext *,
GLuint,
GLuint,
GLuint) =
{
TAG(render_points),
TAG(render_lines),
TAG(render_line_loop),
TAG(render_line_strip),
TAG(render_triangles),
TAG(render_tri_strip),
TAG(render_tri_fan),
TAG(render_quads),
TAG(render_quad_strip),
TAG(render_poly),
TAG(render_noop),
};
#ifndef PRESERVE_VB_DEFS
#undef RENDER_TRI
#undef RENDER_QUAD
#undef RENDER_LINE
#undef RENDER_POINTS
#undef LOCAL_VARS
#undef INIT
#undef POSTFIX
#undef RESET_STIPPLE
#undef DBG
#undef ELT
#undef RENDER_TAB_QUALIFIER
#endif
#ifndef PRESERVE_TAG
#undef TAG
#endif
#undef PRESERVE_VB_DEFS
#undef PRESERVE_TAG