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![Amine Khaldi](/assets/img/avatar_default.png)
* Create a branch for some evul shell experiments. svn path=/branches/shell-experiments/; revision=61927
168 lines
5.4 KiB
C
168 lines
5.4 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.3
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _M_XFORM_H
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#define _M_XFORM_H
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#include "main/compiler.h"
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#include "main/glheader.h"
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#include "math/m_matrix.h"
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#include "math/m_vector.h"
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#ifdef USE_X86_ASM
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#define _XFORMAPI _ASMAPI
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#define _XFORMAPIP _ASMAPIP
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#else
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#define _XFORMAPI
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#define _XFORMAPIP *
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#endif
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extern void
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_math_init_transformation(void);
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extern void
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init_c_cliptest(void);
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/* KW: Clip functions now do projective divide as well. The projected
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* coordinates are very useful to us because they let us cull
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* backfaces and eliminate vertices from lighting, fogging, etc
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* calculations. Despite the fact that this divide could be done one
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* day in hardware, we would still have a reason to want to do it here
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* as long as those other calculations remain in software.
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*
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* Clipping is a convenient place to do the divide on x86 as it should be
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* possible to overlap with integer outcode calculations.
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*
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* There are two cases where we wouldn't want to do the divide in cliptest:
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* - When we aren't clipping. We still might want to cull backfaces
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* so the divide should be done elsewhere. This currently never
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* happens.
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*
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* - When culling isn't likely to help us, such as when the GL culling
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* is disabled and we not lighting or are only lighting
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* one-sided. In this situation, backface determination provides
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* us with no useful information. A tricky case to detect is when
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* all input data is already culled, although hopefully the
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* application wouldn't turn on culling in such cases.
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*
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* We supply a buffer to hold the [x/w,y/w,z/w,1/w] values which
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* are the result of the projection. This is only used in the
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* 4-vector case - in other cases, we just use the clip coordinates
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* as the projected coordinates - they are identical.
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*
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* This is doubly convenient because it means the Win[] array is now
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* of the same stride as all the others, so I can now turn map_vertices
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* into a straight-forward matrix transformation, with asm acceleration
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* automatically available.
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*/
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/* Vertex buffer clipping flags
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*/
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#define CLIP_RIGHT_SHIFT 0
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#define CLIP_LEFT_SHIFT 1
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#define CLIP_TOP_SHIFT 2
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#define CLIP_BOTTOM_SHIFT 3
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#define CLIP_NEAR_SHIFT 4
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#define CLIP_FAR_SHIFT 5
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#define CLIP_RIGHT_BIT 0x01
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#define CLIP_LEFT_BIT 0x02
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#define CLIP_TOP_BIT 0x04
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#define CLIP_BOTTOM_BIT 0x08
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#define CLIP_NEAR_BIT 0x10
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#define CLIP_FAR_BIT 0x20
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#define CLIP_USER_BIT 0x40
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#define CLIP_CULL_BIT 0x80
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#define CLIP_FRUSTUM_BITS 0x3f
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typedef GLvector4f * (_XFORMAPIP clip_func)( GLvector4f *vClip,
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GLvector4f *vProj,
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GLubyte clipMask[],
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GLubyte *orMask,
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GLubyte *andMask );
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typedef void (*dotprod_func)( GLfloat *out,
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GLuint out_stride,
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CONST GLvector4f *coord_vec,
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CONST GLfloat plane[4] );
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typedef void (*vec_copy_func)( GLvector4f *to,
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CONST GLvector4f *from );
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/*
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* Functions for transformation of normals in the VB.
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*/
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typedef void (_NORMAPIP normal_func)( CONST GLmatrix *mat,
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GLfloat scale,
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CONST GLvector4f *in,
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CONST GLfloat lengths[],
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GLvector4f *dest );
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/* Flags for selecting a normal transformation function.
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*/
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#define NORM_RESCALE 0x1 /* apply the scale factor */
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#define NORM_NORMALIZE 0x2 /* normalize */
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#define NORM_TRANSFORM 0x4 /* apply the transformation matrix */
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#define NORM_TRANSFORM_NO_ROT 0x8 /* apply the transformation matrix */
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/* KW: New versions of the transform function allow a mask array
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* specifying that individual vector transform should be skipped
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* when the mask byte is zero. This is always present as a
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* parameter, to allow a unified interface.
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*/
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typedef void (_XFORMAPIP transform_func)( GLvector4f *to_vec,
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CONST GLfloat m[16],
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CONST GLvector4f *from_vec );
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extern dotprod_func _mesa_dotprod_tab[5];
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extern vec_copy_func _mesa_copy_tab[0x10];
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extern vec_copy_func _mesa_copy_clean_tab[5];
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extern clip_func _mesa_clip_tab[5];
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extern clip_func _mesa_clip_np_tab[5];
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extern normal_func _mesa_normal_tab[0xf];
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/* Use of 2 layers of linked 1-dimensional arrays to reduce
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* cost of lookup.
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*/
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extern transform_func *_mesa_transform_tab[5];
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#define TransformRaw( to, mat, from ) \
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( _mesa_transform_tab[(from)->size][(mat)->type]( to, (mat)->m, from ), \
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(to) )
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#endif
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