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/* $Id: t_eval_api.c,v 1.2 2001/01/08 21:56:00 keithw Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2000 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.
*/
#include "glheader.h"
#include "colormac.h"
#include "context.h"
#include "macros.h"
#include "mem.h"
#include "mmath.h"
#include "mtypes.h"
#include "math/m_eval.h"
#include "t_eval_api.h"
#include "t_imm_api.h"
#include "t_imm_alloc.h"
#include "t_imm_exec.h"
/* KW: If are compiling, we don't know whether eval will produce a
* vertex when it is run in the future. If this is pure immediate
* mode, eval is a noop if neither vertex map is enabled.
*
* Thus we need to have a check in the display list code or
* elsewhere for eval(1,2) vertices in the case where
* map(1,2)_vertex is disabled, and to purge those vertices from
* the vb.
*/
void
_tnl_exec_EvalMesh1( GLenum mode, GLint i1, GLint i2 )
{
GET_CURRENT_CONTEXT(ctx);
GLint i;
GLfloat u, du;
GLenum prim;
ASSERT_OUTSIDE_BEGIN_END(ctx);
switch (mode) {
case GL_POINT:
prim = GL_POINTS;
break;
case GL_LINE:
prim = GL_LINE_STRIP;
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glEvalMesh1(mode)" );
return;
}
/* No effect if vertex maps disabled.
*/
if (!ctx->Eval.Map1Vertex4 && !ctx->Eval.Map1Vertex3)
return;
du = ctx->Eval.MapGrid1du;
u = ctx->Eval.MapGrid1u1 + i1 * du;
/* Need to turn off compilation -- this is already saved, and the
* coordinates generated and the test above depend on state that
* may change before the list is executed.
*
* TODO: Anaylse display lists to determine if this state is
* constant.
*/
{
GLboolean compiling = ctx->CompileFlag;
struct immediate *im = TNL_CURRENT_IM(ctx);
if (compiling) {
FLUSH_VERTICES( ctx, 0 );
SET_IMMEDIATE( ctx, _tnl_alloc_immediate( ctx ) );
ctx->CompileFlag = GL_FALSE;
}
_tnl_hard_begin( ctx, prim );
for (i=i1;i<=i2;i++,u+=du) {
_tnl_eval_coord1f( ctx, u );
}
_tnl_end(ctx);
if (compiling) {
FLUSH_VERTICES( ctx, 0 );
ASSERT( TNL_CURRENT_IM(ctx)->ref_count == 0 );
_tnl_free_immediate( TNL_CURRENT_IM(ctx) );
SET_IMMEDIATE( ctx, im );
ctx->CompileFlag = GL_TRUE;
}
}
}
void
_tnl_exec_EvalMesh2( GLenum mode, GLint i1, GLint i2, GLint j1, GLint j2 )
{
GET_CURRENT_CONTEXT(ctx);
GLint i, j;
GLfloat u, du, v, dv, v1, u1;
ASSERT_OUTSIDE_BEGIN_END(ctx);
/* No effect if vertex maps disabled.
*/
if (!ctx->Eval.Map2Vertex4 && !ctx->Eval.Map2Vertex3)
return;
du = ctx->Eval.MapGrid2du;
dv = ctx->Eval.MapGrid2dv;
v1 = ctx->Eval.MapGrid2v1 + j1 * dv;
u1 = ctx->Eval.MapGrid2u1 + i1 * du;
/* Need to turn off compilation -- this is already saved, and the
* coordinates generated and the test above depend on state that
* may change before the list is executed.
*/
{
GLboolean compiling = ctx->CompileFlag;
struct immediate *im = TNL_CURRENT_IM(ctx);
if (compiling) {
FLUSH_VERTICES( ctx, 0 );
SET_IMMEDIATE( ctx, _tnl_alloc_immediate( ctx ) );
ctx->CompileFlag = GL_FALSE;
}
switch (mode) {
case GL_POINT:
_tnl_hard_begin( ctx, GL_POINTS );
for (v=v1,j=j1;j<=j2;j++,v+=dv) {
for (u=u1,i=i1;i<=i2;i++,u+=du) {
_tnl_eval_coord2f( ctx, u, v );
}
}
_tnl_end(ctx);
break;
case GL_LINE:
for (v=v1,j=j1;j<=j2;j++,v+=dv) {
_tnl_hard_begin( ctx, GL_LINE_STRIP );
for (u=u1,i=i1;i<=i2;i++,u+=du) {
_tnl_eval_coord2f( ctx, u, v );
}
_tnl_end(ctx);
}
for (u=u1,i=i1;i<=i2;i++,u+=du) {
_tnl_hard_begin( ctx, GL_LINE_STRIP );
for (v=v1,j=j1;j<=j2;j++,v+=dv) {
_tnl_eval_coord2f( ctx, u, v );
}
_tnl_end(ctx);
}
break;
case GL_FILL:
for (v=v1,j=j1;j<j2;j++,v+=dv) {
_tnl_hard_begin( ctx, GL_TRIANGLE_STRIP );
for (u=u1,i=i1;i<=i2;i++,u+=du) {
_tnl_eval_coord2f( ctx, u, v );
_tnl_eval_coord2f( ctx, u, v+dv );
}
_tnl_end(ctx);
}
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glEvalMesh2(mode)" );
return;
}
if (compiling) {
FLUSH_VERTICES( ctx, 0 );
_tnl_free_immediate( TNL_CURRENT_IM( ctx ) );
SET_IMMEDIATE( ctx, im );
ctx->CompileFlag = GL_TRUE;
}
}
}
void _tnl_eval_init( GLcontext *ctx )
{
GLvertexformat *vfmt = &(TNL_CONTEXT(ctx)->vtxfmt);
vfmt->EvalMesh1 = _tnl_exec_EvalMesh1;
vfmt->EvalMesh2 = _tnl_exec_EvalMesh2;
}
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