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/* $Id: t_vb_normals.c,v 1.14 2002/04/08 15:37:13 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 4.1
*
* Copyright (C) 1999-2002 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 <keithw@valinux.com>
*/
#include "glheader.h"
#include "colormac.h"
#include "context.h"
#include "macros.h"
#include "mem.h"
#include "mmath.h"
#include "mtypes.h"
#include "math/m_xform.h"
#include "t_context.h"
#include "t_pipeline.h"
struct normal_stage_data {
normal_func NormalTransform;
GLvector4f normal;
};
#define NORMAL_STAGE_DATA(stage) ((struct normal_stage_data *)stage->privatePtr)
static GLboolean run_normal_stage( GLcontext *ctx,
struct gl_pipeline_stage *stage )
{
struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
ASSERT(store->NormalTransform);
if (stage->changed_inputs) {
/* We can only use the display list's saved normal lengths if we've
* got a transformation matrix with uniform scaling.
*/
const GLfloat *lengths;
if (ctx->ModelviewMatrixStack.Top->flags & MAT_FLAG_GENERAL_SCALE)
lengths = NULL;
else
lengths = VB->NormalLengthPtr;
store->NormalTransform( ctx->ModelviewMatrixStack.Top,
ctx->_ModelViewInvScale,
VB->NormalPtr,
lengths,
&store->normal );
}
VB->NormalPtr = &store->normal;
VB->NormalLengthPtr = 0; /* no longer valid */
return GL_TRUE;
}
static GLboolean run_validate_normal_stage( GLcontext *ctx,
struct gl_pipeline_stage *stage )
{
struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
ASSERT(ctx->_NeedNormals);
if (ctx->_NeedEyeCoords) {
GLuint transform = NORM_TRANSFORM_NO_ROT;
if (ctx->ModelviewMatrixStack.Top->flags & (MAT_FLAG_GENERAL |
MAT_FLAG_ROTATION |
MAT_FLAG_GENERAL_3D |
MAT_FLAG_PERSPECTIVE))
transform = NORM_TRANSFORM;
if (ctx->Transform.Normalize) {
store->NormalTransform = _mesa_normal_tab[transform | NORM_NORMALIZE];
}
else if (ctx->Transform.RescaleNormals &&
ctx->_ModelViewInvScale != 1.0) {
store->NormalTransform = _mesa_normal_tab[transform | NORM_RESCALE];
}
else {
store->NormalTransform = _mesa_normal_tab[transform];
}
}
else {
if (ctx->Transform.Normalize) {
store->NormalTransform = _mesa_normal_tab[NORM_NORMALIZE];
}
else if (!ctx->Transform.RescaleNormals &&
ctx->_ModelViewInvScale != 1.0) {
store->NormalTransform = _mesa_normal_tab[NORM_RESCALE];
}
else {
store->NormalTransform = 0;
}
}
if (store->NormalTransform) {
stage->run = run_normal_stage;
return stage->run( ctx, stage );
} else {
stage->active = GL_FALSE; /* !!! */
return GL_TRUE;
}
}
static void check_normal_transform( GLcontext *ctx,
struct gl_pipeline_stage *stage )
{
stage->active = ctx->_NeedNormals && !ctx->VertexProgram.Enabled;
/* Don't clobber the initialize function:
*/
if (stage->privatePtr)
stage->run = run_validate_normal_stage;
}
static GLboolean alloc_normal_data( GLcontext *ctx,
struct gl_pipeline_stage *stage )
{
TNLcontext *tnl = TNL_CONTEXT(ctx);
struct normal_stage_data *store;
stage->privatePtr = MALLOC(sizeof(*store));
store = NORMAL_STAGE_DATA(stage);
if (!store)
return GL_FALSE;
_mesa_vector4f_alloc( &store->normal, 0, tnl->vb.Size, 32 );
/* Now run the stage.
*/
stage->run = run_validate_normal_stage;
return stage->run( ctx, stage );
}
static void free_normal_data( struct gl_pipeline_stage *stage )
{
struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
if (store) {
_mesa_vector4f_free( &store->normal );
FREE( store );
stage->privatePtr = NULL;
}
}
#define _TNL_NEW_NORMAL_TRANSFORM (_NEW_MODELVIEW| \
_NEW_TRANSFORM| \
_MESA_NEW_NEED_NORMALS| \
_MESA_NEW_NEED_EYE_COORDS)
const struct gl_pipeline_stage _tnl_normal_transform_stage =
{
"normal transform", /* name */
_TNL_NEW_NORMAL_TRANSFORM, /* re-check */
_TNL_NEW_NORMAL_TRANSFORM, /* re-run */
GL_FALSE, /* active? */
VERT_BIT_NORMAL, /* inputs */
VERT_BIT_NORMAL, /* outputs */
0, /* changed_inputs */
NULL, /* private data */
free_normal_data, /* destructor */
check_normal_transform, /* check */
alloc_normal_data /* run -- initially set to alloc */
};
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