/*
* Mesa 3-D graphics library
- * Version: 6.2
+ * Version: 6.3
*
- * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2005 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"),
#include "m_matrix.h"
+/**
+ * \defgroup MatFlags MAT_FLAG_XXX-flags
+ *
+ * Bitmasks to indicate different kinds of 4x4 matrices in GLmatrix::flags
+ * It would be nice to make all these flags private to m_matrix.c
+ */
+/*@{*/
+#define MAT_FLAG_IDENTITY 0 /**< is an identity matrix flag.
+ * (Not actually used - the identity
+ * matrix is identified by the absense
+ * of all other flags.)
+ */
+#define MAT_FLAG_GENERAL 0x1 /**< is a general matrix flag */
+#define MAT_FLAG_ROTATION 0x2 /**< is a rotation matrix flag */
+#define MAT_FLAG_TRANSLATION 0x4 /**< is a translation matrix flag */
+#define MAT_FLAG_UNIFORM_SCALE 0x8 /**< is an uniform scaling matrix flag */
+#define MAT_FLAG_GENERAL_SCALE 0x10 /**< is a general scaling matrix flag */
+#define MAT_FLAG_GENERAL_3D 0x20 /**< general 3D matrix flag */
+#define MAT_FLAG_PERSPECTIVE 0x40 /**< is a perspective proj matrix flag */
+#define MAT_FLAG_SINGULAR 0x80 /**< is a singular matrix flag */
+#define MAT_DIRTY_TYPE 0x100 /**< matrix type is dirty */
+#define MAT_DIRTY_FLAGS 0x200 /**< matrix flags are dirty */
+#define MAT_DIRTY_INVERSE 0x400 /**< matrix inverse is dirty */
+
+/** angle preserving matrix flags mask */
+#define MAT_FLAGS_ANGLE_PRESERVING (MAT_FLAG_ROTATION | \
+ MAT_FLAG_TRANSLATION | \
+ MAT_FLAG_UNIFORM_SCALE)
+
+/** geometry related matrix flags mask */
+#define MAT_FLAGS_GEOMETRY (MAT_FLAG_GENERAL | \
+ MAT_FLAG_ROTATION | \
+ MAT_FLAG_TRANSLATION | \
+ MAT_FLAG_UNIFORM_SCALE | \
+ MAT_FLAG_GENERAL_SCALE | \
+ MAT_FLAG_GENERAL_3D | \
+ MAT_FLAG_PERSPECTIVE | \
+ MAT_FLAG_SINGULAR)
+
+/** length preserving matrix flags mask */
+#define MAT_FLAGS_LENGTH_PRESERVING (MAT_FLAG_ROTATION | \
+ MAT_FLAG_TRANSLATION)
+
+
+/** 3D (non-perspective) matrix flags mask */
+#define MAT_FLAGS_3D (MAT_FLAG_ROTATION | \
+ MAT_FLAG_TRANSLATION | \
+ MAT_FLAG_UNIFORM_SCALE | \
+ MAT_FLAG_GENERAL_SCALE | \
+ MAT_FLAG_GENERAL_3D)
+
+/** dirty matrix flags mask */
+#define MAT_DIRTY (MAT_DIRTY_TYPE | \
+ MAT_DIRTY_FLAGS | \
+ MAT_DIRTY_INVERSE)
+
+/*@}*/
+
+
+/**
+ * Test geometry related matrix flags.
+ *
+ * \param mat a pointer to a GLmatrix structure.
+ * \param a flags mask.
+ *
+ * \returns non-zero if all geometry related matrix flags are contained within
+ * the mask, or zero otherwise.
+ */
+#define TEST_MAT_FLAGS(mat, a) \
+ ((MAT_FLAGS_GEOMETRY & (~(a)) & ((mat)->flags) ) == 0)
+
+
+
/**
* Names of the corresponding GLmatrixtype values.
*/
{
dest->flags |= (MAT_FLAG_GENERAL |
MAT_DIRTY_TYPE |
- MAT_DIRTY_INVERSE);
+ MAT_DIRTY_INVERSE |
+ MAT_DIRTY_FLAGS);
matmul4( dest->m, dest->m, m );
}
r3[7] = 1.0, r3[4] = r3[5] = r3[6] = 0.0;
/* choose pivot - or die */
- if (fabs(r3[0])>fabs(r2[0])) SWAP_ROWS(r3, r2);
- if (fabs(r2[0])>fabs(r1[0])) SWAP_ROWS(r2, r1);
- if (fabs(r1[0])>fabs(r0[0])) SWAP_ROWS(r1, r0);
+ if (FABSF(r3[0])>FABSF(r2[0])) SWAP_ROWS(r3, r2);
+ if (FABSF(r2[0])>FABSF(r1[0])) SWAP_ROWS(r2, r1);
+ if (FABSF(r1[0])>FABSF(r0[0])) SWAP_ROWS(r1, r0);
if (0.0 == r0[0]) return GL_FALSE;
/* eliminate first variable */
if (s != 0.0) { r1[7] -= m1 * s; r2[7] -= m2 * s; r3[7] -= m3 * s; }
/* choose pivot - or die */
- if (fabs(r3[1])>fabs(r2[1])) SWAP_ROWS(r3, r2);
- if (fabs(r2[1])>fabs(r1[1])) SWAP_ROWS(r2, r1);
+ if (FABSF(r3[1])>FABSF(r2[1])) SWAP_ROWS(r3, r2);
+ if (FABSF(r2[1])>FABSF(r1[1])) SWAP_ROWS(r2, r1);
if (0.0 == r1[1]) return GL_FALSE;
/* eliminate second variable */
s = r1[7]; if (0.0 != s) { r2[7] -= m2 * s; r3[7] -= m3 * s; }
/* choose pivot - or die */
- if (fabs(r3[2])>fabs(r2[2])) SWAP_ROWS(r3, r2);
+ if (FABSF(r3[2])>FABSF(r2[2])) SWAP_ROWS(r3, r2);
if (0.0 == r2[2]) return GL_FALSE;
/* eliminate third variable */
GLfloat m[16];
GLboolean optimized;
- s = (GLfloat) sin( angle * DEG2RAD );
- c = (GLfloat) cos( angle * DEG2RAD );
+ s = (GLfloat) _mesa_sin( angle * DEG2RAD );
+ c = (GLfloat) _mesa_cos( angle * DEG2RAD );
MEMCPY(m, Identity, sizeof(GLfloat)*16);
optimized = GL_FALSE;
m[2] *= x; m[6] *= y; m[10] *= z;
m[3] *= x; m[7] *= y; m[11] *= z;
- if (fabs(x - y) < 1e-8 && fabs(x - z) < 1e-8)
+ if (FABSF(x - y) < 1e-8 && FABSF(x - z) < 1e-8)
mat->flags |= MAT_FLAG_UNIFORM_SCALE;
else
mat->flags |= MAT_FLAG_GENERAL_SCALE;
MAT_DIRTY_INVERSE);
}
+
+/**
+ * Set matrix to do viewport and depthrange mapping.
+ * Transforms Normalized Device Coords to window/Z values.
+ */
+void
+_math_matrix_viewport(GLmatrix *m, GLint x, GLint y, GLint width, GLint height,
+ GLfloat zNear, GLfloat zFar, GLfloat depthMax)
+{
+ m->m[MAT_SX] = (GLfloat) width / 2.0F;
+ m->m[MAT_TX] = m->m[MAT_SX] + x;
+ m->m[MAT_SY] = (GLfloat) height / 2.0F;
+ m->m[MAT_TY] = m->m[MAT_SY] + y;
+ m->m[MAT_SZ] = depthMax * ((zFar - zNear) / 2.0F);
+ m->m[MAT_TZ] = depthMax * ((zFar - zNear) / 2.0F + zNear);
+ m->flags = MAT_FLAG_GENERAL_SCALE | MAT_FLAG_TRANSLATION;
+ m->type = MATRIX_3D_NO_ROT;
+}
+
+
/**
* Set a matrix to the identity matrix.
*
/*@}*/
+/**
+ * Test if the given matrix preserves vector lengths.
+ */
+GLboolean
+_math_matrix_is_length_preserving( const GLmatrix *m )
+{
+ return TEST_MAT_FLAGS( m, MAT_FLAGS_LENGTH_PRESERVING);
+}
+
+
+/**
+ * Test if the given matrix does any rotation.
+ * (or perhaps if the upper-left 3x3 is non-identity)
+ */
+GLboolean
+_math_matrix_has_rotation( const GLmatrix *m )
+{
+ if (m->flags & (MAT_FLAG_GENERAL |
+ MAT_FLAG_ROTATION |
+ MAT_FLAG_GENERAL_3D |
+ MAT_FLAG_PERSPECTIVE))
+ return GL_TRUE;
+ else
+ return GL_FALSE;
+}
+
+
+GLboolean
+_math_matrix_is_general_scale( const GLmatrix *m )
+{
+ return (m->flags & MAT_FLAG_GENERAL_SCALE) ? GL_TRUE : GL_FALSE;
+}
+
+
+GLboolean
+_math_matrix_is_dirty( const GLmatrix *m )
+{
+ return (m->flags & MAT_DIRTY) ? GL_TRUE : GL_FALSE;
+}
+
+
/**********************************************************************/
/** \name Matrix setup */
/*@{*/
projects / mesa.git / blobdiff