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/* $Id: t_vb_vertex.c,v 1.1 2003-02-28 11:48:08 pj Exp $ */
/*
* Mesa 3-D graphics library
* Version: 5.0
*
* 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>
*/
#include "glheader.h"
#include "colormac.h"
#include "context.h"
#include "macros.h"
#include "imports.h"
#include "mmath.h"
#include "mtypes.h"
#include "math/m_xform.h"
#include "t_context.h"
#include "t_pipeline.h"
struct vertex_stage_data {
GLvector4f eye;
GLvector4f clip;
GLvector4f proj;
GLubyte *clipmask;
GLubyte ormask;
GLubyte andmask;
/* Need these because it's difficult to replay the sideeffects
* analytically.
*/
GLvector4f *save_eyeptr;
GLvector4f *save_clipptr;
GLvector4f *save_ndcptr;
};
#define VERTEX_STAGE_DATA(stage) ((struct vertex_stage_data *)stage->privatePtr)
/* This function implements cliptesting for user-defined clip planes.
* The clipping of primitives to these planes is implemented in
* t_render_clip.h.
*/
#define USER_CLIPTEST(NAME, SZ) \
static void NAME( GLcontext *ctx, \
GLvector4f *clip, \
GLubyte *clipmask, \
GLubyte *clipormask, \
GLubyte *clipandmask ) \
{ \
GLuint p; \
\
for (p = 0; p < ctx->Const.MaxClipPlanes; p++) \
if (ctx->Transform.ClipPlanesEnabled & (1 << p)) { \
GLuint nr, i; \
const GLfloat a = ctx->Transform._ClipUserPlane[p][0]; \
const GLfloat b = ctx->Transform._ClipUserPlane[p][1]; \
const GLfloat c = ctx->Transform._ClipUserPlane[p][2]; \
const GLfloat d = ctx->Transform._ClipUserPlane[p][3]; \
GLfloat *coord = (GLfloat *)clip->data; \
GLuint stride = clip->stride; \
GLuint count = clip->count; \
\
for (nr = 0, i = 0 ; i < count ; i++) { \
GLfloat dp = coord[0] * a + coord[1] * b; \
if (SZ > 2) dp += coord[2] * c; \
if (SZ > 3) dp += coord[3] * d; else dp += d; \
\
if (dp < 0) { \
nr++; \
clipmask[i] |= CLIP_USER_BIT; \
} \
\
STRIDE_F(coord, stride); \
} \
\
if (nr > 0) { \
*clipormask |= CLIP_USER_BIT; \
if (nr == count) { \
*clipandmask |= CLIP_USER_BIT; \
return; \
} \
} \
} \
}
USER_CLIPTEST(userclip2, 2)
USER_CLIPTEST(userclip3, 3)
USER_CLIPTEST(userclip4, 4)
static void (*(usercliptab[5]))( GLcontext *,
GLvector4f *, GLubyte *,
GLubyte *, GLubyte * ) =
{
0,
0,
userclip2,
userclip3,
userclip4
};
static GLboolean run_vertex_stage( GLcontext *ctx,
struct gl_pipeline_stage *stage )
{
struct vertex_stage_data *store = (struct vertex_stage_data *)stage->privatePtr;
TNLcontext *tnl = TNL_CONTEXT(ctx);
struct vertex_buffer *VB = &tnl->vb;
ASSERT(!ctx->VertexProgram.Enabled);
if (stage->changed_inputs) {
if (ctx->_NeedEyeCoords) {
/* Separate modelview transformation:
* Use combined ModelProject to avoid some depth artifacts
*/
if (ctx->ModelviewMatrixStack.Top->type == MATRIX_IDENTITY)
VB->EyePtr = VB->ObjPtr;
else
VB->EyePtr = TransformRaw( &store->eye,
ctx->ModelviewMatrixStack.Top,
VB->ObjPtr);
if (ctx->ProjectionMatrixStack.Top->type == MATRIX_IDENTITY)
VB->ClipPtr = VB->EyePtr;
else
VB->ClipPtr = TransformRaw( &store->clip,
&ctx->_ModelProjectMatrix,
VB->ObjPtr );
}
else {
/* Combined modelviewproject transform:
*/
if (ctx->_ModelProjectMatrix.type == MATRIX_IDENTITY)
VB->ClipPtr = VB->ObjPtr;
else
VB->ClipPtr = TransformRaw( &store->clip,
&ctx->_ModelProjectMatrix,
VB->ObjPtr );
}
/* Drivers expect this to be clean to element 4...
*/
if (VB->ClipPtr->size < 4) {
if (VB->ClipPtr->flags & VEC_NOT_WRITEABLE) {
ASSERT(VB->ClipPtr == VB->ObjPtr);
VB->import_data( ctx, VERT_BIT_POS, VEC_NOT_WRITEABLE );
VB->ClipPtr = VB->ObjPtr;
}
if (VB->ClipPtr->size == 2)
_mesa_vector4f_clean_elem( VB->ClipPtr, VB->Count, 2 );
_mesa_vector4f_clean_elem( VB->ClipPtr, VB->Count, 3 );
}
/* Cliptest and perspective divide. Clip functions must clear
* the clipmask.
*/
store->ormask = 0;
store->andmask = CLIP_ALL_BITS;
if (tnl->NeedNdcCoords) {
VB->NdcPtr =
_mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
&store->proj,
store->clipmask,
&store->ormask,
&store->andmask );
}
else {
VB->NdcPtr = 0;
_mesa_clip_np_tab[VB->ClipPtr->size]( VB->ClipPtr,
0,
store->clipmask,
&store->ormask,
&store->andmask );
}
if (store->andmask)
return GL_FALSE;
/* Test userclip planes. This contributes to VB->ClipMask, so
* is essentially required to be in this stage.
*/
if (ctx->Transform.ClipPlanesEnabled) {
usercliptab[VB->ClipPtr->size]( ctx,
VB->ClipPtr,
store->clipmask,
&store->ormask,
&store->andmask );
if (store->andmask)
return GL_FALSE;
}
VB->ClipOrMask = store->ormask;
VB->ClipMask = store->clipmask;
if (VB->ClipPtr == VB->ObjPtr && (VB->importable_data & VERT_BIT_POS))
VB->importable_data |= VERT_BIT_CLIP;
store->save_eyeptr = VB->EyePtr;
store->save_clipptr = VB->ClipPtr;
store->save_ndcptr = VB->NdcPtr;
}
else {
/* Replay the sideeffects.
*/
VB->EyePtr = store->save_eyeptr;
VB->ClipPtr = store->save_clipptr;
VB->NdcPtr = store->save_ndcptr;
VB->ClipMask = store->clipmask;
VB->ClipOrMask = store->ormask;
if (VB->ClipPtr == VB->ObjPtr && (VB->importable_data & VERT_BIT_POS))
VB->importable_data |= VERT_BIT_CLIP;
if (store->andmask)
return GL_FALSE;
}
return GL_TRUE;
}
static void check_vertex( GLcontext *ctx, struct gl_pipeline_stage *stage )
{
stage->active = !ctx->VertexProgram.Enabled;
}
static GLboolean init_vertex_stage( GLcontext *ctx,
struct gl_pipeline_stage *stage )
{
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
struct vertex_stage_data *store;
GLuint size = VB->Size;
stage->privatePtr = CALLOC(sizeof(*store));
store = VERTEX_STAGE_DATA(stage);
if (!store)
return GL_FALSE;
_mesa_vector4f_alloc( &store->eye, 0, size, 32 );
_mesa_vector4f_alloc( &store->clip, 0, size, 32 );
_mesa_vector4f_alloc( &store->proj, 0, size, 32 );
store->clipmask = (GLubyte *) ALIGN_MALLOC(sizeof(GLubyte)*size, 32 );
if (!store->clipmask ||
!store->eye.data ||
!store->clip.data ||
!store->proj.data)
return GL_FALSE;
/* Now run the stage.
*/
stage->run = run_vertex_stage;
return stage->run( ctx, stage );
}
static void dtr( struct gl_pipeline_stage *stage )
{
struct vertex_stage_data *store = VERTEX_STAGE_DATA(stage);
if (store) {
_mesa_vector4f_free( &store->eye );
_mesa_vector4f_free( &store->clip );
_mesa_vector4f_free( &store->proj );
ALIGN_FREE( store->clipmask );
FREE(store);
stage->privatePtr = NULL;
stage->run = init_vertex_stage;
}
}
const struct gl_pipeline_stage _tnl_vertex_transform_stage =
{
"modelview/project/cliptest/divide",
_NEW_PROGRAM, /* check_state: only care about vertex prog */
_MESA_NEW_NEED_EYE_COORDS | /* run_state: when to invalidate / re-run */
_NEW_MODELVIEW|
_NEW_PROJECTION|
_NEW_PROGRAM|
_NEW_TRANSFORM,
GL_TRUE, /* active */
VERT_BIT_POS, /* inputs */
VERT_BIT_EYE|VERT_BIT_CLIP, /* outputs */
0, /* changed_inputs */
NULL, /* private data */
dtr, /* destructor */
check_vertex, /* check */
init_vertex_stage /* run -- initially set to init */
};