svn merge ^/branches/released . --username marha

1 files changed, 166 insertions, 0 deletions

diff --git a/mesalib/src/mesa/math/m_xform.h b/mesalib/src/mesa/math/m_xform.h
new file mode 100644
index 000000000..7ef76e0b9
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+++ b/mesalib/src/mesa/math/m_xform.h
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+/*
+ * Mesa 3-D graphics library
+ * Version:  7.3
+ *
+ * Copyright (C) 1999-2008  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.
+ */
+
+
+#ifndef _M_XFORM_H
+#define _M_XFORM_H
+
+
+#include "main/glheader.h"
+#include "main/config.h"
+#include "math/m_vector.h"
+#include "math/m_matrix.h"
+
+#ifdef USE_X86_ASM
+#define _XFORMAPI _ASMAPI
+#define _XFORMAPIP _ASMAPIP
+#else
+#define _XFORMAPI
+#define _XFORMAPIP *
+#endif
+
+
+extern void
+_math_init_transformation(void);
+
+
+/* KW: Clip functions now do projective divide as well.  The projected
+ * coordinates are very useful to us because they let us cull
+ * backfaces and eliminate vertices from lighting, fogging, etc
+ * calculations.  Despite the fact that this divide could be done one
+ * day in hardware, we would still have a reason to want to do it here
+ * as long as those other calculations remain in software.
+ *
+ * Clipping is a convenient place to do the divide on x86 as it should be
+ * possible to overlap with integer outcode calculations.
+ *
+ * There are two cases where we wouldn't want to do the divide in cliptest:
+ *    - When we aren't clipping.  We still might want to cull backfaces
+ *      so the divide should be done elsewhere.  This currently never
+ *      happens.
+ *
+ *    - When culling isn't likely to help us, such as when the GL culling
+ *      is disabled and we not lighting or are only lighting
+ *      one-sided.  In this situation, backface determination provides
+ *      us with no useful information.  A tricky case to detect is when
+ *      all input data is already culled, although hopefully the
+ *      application wouldn't turn on culling in such cases.
+ *
+ * We supply a buffer to hold the [x/w,y/w,z/w,1/w] values which
+ * are the result of the projection.  This is only used in the
+ * 4-vector case - in other cases, we just use the clip coordinates
+ * as the projected coordinates - they are identical.
+ *
+ * This is doubly convenient because it means the Win[] array is now
+ * of the same stride as all the others, so I can now turn map_vertices
+ * into a straight-forward matrix transformation, with asm acceleration
+ * automatically available.
+ */
+
+/* Vertex buffer clipping flags
+ */
+#define CLIP_RIGHT_SHIFT 	0
+#define CLIP_LEFT_SHIFT 	1
+#define CLIP_TOP_SHIFT  	2
+#define CLIP_BOTTOM_SHIFT       3
+#define CLIP_NEAR_SHIFT  	4
+#define CLIP_FAR_SHIFT  	5
+
+#define CLIP_RIGHT_BIT   0x01
+#define CLIP_LEFT_BIT    0x02
+#define CLIP_TOP_BIT     0x04
+#define CLIP_BOTTOM_BIT  0x08
+#define CLIP_NEAR_BIT    0x10
+#define CLIP_FAR_BIT     0x20
+#define CLIP_USER_BIT    0x40
+#define CLIP_CULL_BIT    0x80
+#define CLIP_FRUSTUM_BITS    0x3f
+
+
+typedef GLvector4f * (_XFORMAPIP clip_func)( GLvector4f *vClip,
+					     GLvector4f *vProj,
+					     GLubyte clipMask[],
+					     GLubyte *orMask,
+					     GLubyte *andMask );
+
+typedef void (*dotprod_func)( GLfloat *out,
+			      GLuint out_stride,
+			      CONST GLvector4f *coord_vec,
+			      CONST GLfloat plane[4] );
+
+typedef void (*vec_copy_func)( GLvector4f *to,
+			       CONST GLvector4f *from );
+
+
+
+/*
+ * Functions for transformation of normals in the VB.
+ */
+typedef void (_NORMAPIP normal_func)( CONST GLmatrix *mat,
+				      GLfloat scale,
+				      CONST GLvector4f *in,
+				      CONST GLfloat lengths[],
+				      GLvector4f *dest );
+
+
+/* Flags for selecting a normal transformation function.
+ */
+#define NORM_RESCALE   0x1		/* apply the scale factor */
+#define NORM_NORMALIZE 0x2		/* normalize */
+#define NORM_TRANSFORM 0x4		/* apply the transformation matrix */
+#define NORM_TRANSFORM_NO_ROT 0x8	/* apply the transformation matrix */
+
+
+
+
+/* KW: New versions of the transform function allow a mask array
+ *     specifying that individual vector transform should be skipped
+ *     when the mask byte is zero.  This is always present as a
+ *     parameter, to allow a unified interface.
+ */
+typedef void (_XFORMAPIP transform_func)( GLvector4f *to_vec,
+					  CONST GLfloat m[16],
+					  CONST GLvector4f *from_vec );
+
+
+extern dotprod_func  _mesa_dotprod_tab[5];
+extern vec_copy_func _mesa_copy_tab[0x10];
+extern vec_copy_func _mesa_copy_clean_tab[5];
+extern clip_func     _mesa_clip_tab[5];
+extern clip_func     _mesa_clip_np_tab[5];
+extern normal_func   _mesa_normal_tab[0xf];
+
+/* Use of 2 layers of linked 1-dimensional arrays to reduce
+ * cost of lookup.
+ */
+extern transform_func *_mesa_transform_tab[5];
+
+
+
+#define TransformRaw( to, mat, from ) \
+   ( _mesa_transform_tab[(from)->size][(mat)->type]( to, (mat)->m, from ), \
+     (to) )
+
+
+#endif