diff options
Diffstat (limited to 'libdimension/dimension')
| -rw-r--r-- | libdimension/dimension/canvas.h | 50 | ||||
| -rw-r--r-- | libdimension/dimension/color.h | 46 | ||||
| -rw-r--r-- | libdimension/dimension/geometry.h | 92 |
3 files changed, 188 insertions, 0 deletions
diff --git a/libdimension/dimension/canvas.h b/libdimension/dimension/canvas.h new file mode 100644 index 0000000..251c64a --- /dev/null +++ b/libdimension/dimension/canvas.h @@ -0,0 +1,50 @@ +/************************************************************************* + * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> * + * * + * This file is part of Dimension. * + * * + * Dimension is free software; you can redistribute it and/or modify it * + * under the terms of the GNU Lesser General Public License as published * + * by the Free Software Foundation; either version 3 of the License, or * + * (at your option) any later version. * + * * + * Dimension is distributed in the hope that it will be useful, but * + * WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * + * Lesser General Public License for more details. * + * * + * You should have received a copy of the GNU Lesser General Public * + * License along with this program. If not, see * + * <http://www.gnu.org/licenses/>. * + *************************************************************************/ + +/* + * A canvas which is rendered to. + */ + +#ifndef DIMENSION_CANVAS_H +#define DIMENSION_CANVAS_H + +/* 48-bit sRGB color for pixels. */ +typedef struct { + uint16_t r, g, b; + uint16_t a, t; +} dmnsn_pixel; + +dmnsn_pixel dmnsn_pixel_from_color(dmnsn_color color); +dmnsn_color dmnsn_color_from_pixel(dmnsn_pixel pixel); + +typedef struct { + unsigned int x, y; + + /* + * Stored in first-quadrant representation (origin is bottom-left). The pixel + * at (a,b) is accessible as pixels[b*x + a]. + */ + dmnsn_pixel *pixels; +} dmnsn_canvas; + +dmnsn_canvas *dmnsn_new_canvas(unsigned int x, unsigned int y); +void dmnsn_delete_canvas(dmnsn_canvas *canvas); + +#endif /* DIMENSION_CANVAS_H */ diff --git a/libdimension/dimension/color.h b/libdimension/dimension/color.h new file mode 100644 index 0000000..1f4a42e --- /dev/null +++ b/libdimension/dimension/color.h @@ -0,0 +1,46 @@ +/************************************************************************* + * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> * + * * + * This file is part of Dimension. * + * * + * Dimension is free software; you can redistribute it and/or modify it * + * under the terms of the GNU Lesser General Public License as published * + * by the Free Software Foundation; either version 3 of the License, or * + * (at your option) any later version. * + * * + * Dimension is distributed in the hope that it will be useful, but * + * WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * + * Lesser General Public License for more details. * + * * + * You should have received a copy of the GNU Lesser General Public * + * License along with this program. If not, see * + * <http://www.gnu.org/licenses/>. * + *************************************************************************/ + +/* + * Types to represent color. + */ + +#ifndef DIMENSION_COLOR_H +#define DIMENSION_COLOR_H + +#ifdef __cplusplus +extern "C" { +#endif + +/* CIE 1931 XYZ color. */ +typedef struct { + double X, Y, Z; /* X, Y, and Z are the tristimulus values of a color in CIE + 1931 XYZ color space. We use an unlimited light model + here, where the range of X, Y, and Z are unbounded >= 0. */ + double alpha, trans; /* Alpha transparancy only lets light of this color + through; regular transparancy lets all colors + through */ +} dmnsn_color; + +#ifdef __cplusplus +} +#endif + +#endif /* DIMENSION_COLOR_H */ diff --git a/libdimension/dimension/geometry.h b/libdimension/dimension/geometry.h new file mode 100644 index 0000000..2c0c204 --- /dev/null +++ b/libdimension/dimension/geometry.h @@ -0,0 +1,92 @@ +/************************************************************************* + * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> * + * * + * This file is part of Dimension. * + * * + * Dimension is free software; you can redistribute it and/or modify it * + * under the terms of the GNU Lesser General Public License as published * + * by the Free Software Foundation; either version 3 of the License, or * + * (at your option) any later version. * + * * + * Dimension is distributed in the hope that it will be useful, but * + * WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * + * Lesser General Public License for more details. * + * * + * You should have received a copy of the GNU Lesser General Public * + * License along with this program. If not, see * + * <http://www.gnu.org/licenses/>. * + *************************************************************************/ + +/* + * Core geometric types like scalars, vectors, and rays. + */ + +#ifndef DIMENSION_GEOMETRY_H +#define DIMENSION_GEOMETRY_H + +/* Scalar and vector types. */ +typedef double dmnsn_scalar; +typedef struct { dmnsn_scalar x, y, z; } dmnsn_vector; + +/* Vector arithmetic */ + +inline dmnsn_vector +dmnsn_vector_construct(dmnsn_scalar x, dmnsn_scalar y, dmnsn_scalar z) +{ + dmnsn_vector v = { .x = x, .y = y, .z = z }; + return v; +} + +inline dmnsn_vector +dmnsn_vector_add(dmnsn_vector lhs, dmnsn_vector rhs) +{ + return dmnsn_vector_construct(lhs.x + rhs.x, lhs.y + rhs.y, lhs.z + rhs.z); +} + +inline dmnsn_vector +dmnsn_vector_sub(dmnsn_vector lhs, dmnsn_vector rhs) +{ + return dmnsn_vector_construct(lhs.x - rhs.x, lhs.y - rhs.y, lhs.z - rhs.z); +} + +inline dmnsn_vector +dmnsn_vector_mul(dmnsn_scalar lhs, dmnsn_vector rhs) +{ + return dmnsn_vector_construct(lhs*rhs.x, lhs*rhs.y, lhs*rhs.z); +} + +inline dmnsn_vector +dmnsn_vector_div(dmnsn_vector lhs, dmnsn_scalar rhs) +{ + return dmnsn_vector_construct(lhs.x/rhs, lhs.y/rhs, lhs.z/rhs); +} + +inline dmnsn_scalar +dmnsn_vector_dot(dmnsn_vector lhs, dmnsn_vector rhs) +{ + return lhs.x*rhs.x + lhs.y*rhs.y + lhs.z*rhs.z; +} + +inline dmnsn_vector +dmnsn_vector_cross(dmnsn_vector lhs, dmnsn_vector rhs) +{ + return dmnsn_vector_construct(lhs.y*rhs.z - lhs.z*rhs.y, + lhs.z*rhs.x - lhs.x*rhs.z, + lhs.x*rhs.y - lhs.y*rhs.x); +} + +/* A line, or ray. */ +typedef struct { + dmnsn_vector x0; /* A point on the line */ + dmnsn_vector n; /* A normal vector; the direction of the line */ +} dmnsn_line; + +/* A point on a line, defined by x0 + t*n */ +inline dmnsn_vector +dmnsn_line_point(dmnsn_line l, dmnsn_scalar t) +{ + return dmnsn_vector_add(l.x0, dmnsn_vector_mul(t, l.n)); +} + +#endif /* DIMENSION_GEOMETRY_H */ |