1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/mglimpl.h	Mon Nov 21 06:14:01 2011 +0200
     1.3 @@ -0,0 +1,75 @@
     1.4 +/*
     1.5 +256-color 3D graphics hack for real-mode DOS.
     1.6 +Copyright (C) 2011  John Tsiombikas <nuclear@member.fsf.org>
     1.7 +
     1.8 +This program is free software: you can redistribute it and/or modify
     1.9 +it under the terms of the GNU General Public License as published by
    1.10 +the Free Software Foundation, either version 3 of the License, or
    1.11 +(at your option) any later version.
    1.12 +
    1.13 +This program is distributed in the hope that it will be useful,
    1.14 +but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.15 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.16 +GNU General Public License for more details.
    1.17 +
    1.18 +You should have received a copy of the GNU General Public License
    1.19 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
    1.20 +*/
    1.21 +#ifndef MGL_IMPL_H_
    1.22 +#define MGL_IMPL_H_
    1.23 +
    1.24 +#define MATRIX_STACK_SIZE	8
    1.25 +#define MAX_LIGHTS			4
    1.26 +
    1.27 +#define ROUND(x)	((x) >= 0.0 ? (x) + 0.5 : (x) - 0.5)
    1.28 +
    1.29 +typedef struct {
    1.30 +	float x, y, z, w;
    1.31 +} vec4_t;
    1.32 +
    1.33 +typedef struct {
    1.34 +	float x, y, z;
    1.35 +} vec3_t;
    1.36 +
    1.37 +typedef struct {
    1.38 +	float x, y;
    1.39 +} vec2_t;
    1.40 +
    1.41 +typedef float mat4_t[16];
    1.42 +
    1.43 +struct vertex {
    1.44 +	vec4_t pos;
    1.45 +	vec3_t norm;
    1.46 +	vec2_t tc;
    1.47 +	float energy;
    1.48 +	int cidx;
    1.49 +};
    1.50 +
    1.51 +struct state {
    1.52 +	unsigned int flags;
    1.53 +	int ord, frontface, cullface;
    1.54 +	int mmode, mtop[2];
    1.55 +	mat4_t matrix[2][MATRIX_STACK_SIZE];
    1.56 +	int prim;
    1.57 +	struct vertex curv, v[4];
    1.58 +	int vidx;
    1.59 +	int vp[4];	/* viewport */
    1.60 +	int col_range;	/* color interpolation range */
    1.61 +	vec3_t ldir[MAX_LIGHTS];
    1.62 +	float lint[MAX_LIGHTS];
    1.63 +};
    1.64 +
    1.65 +struct framebuffer {
    1.66 +	int width, height;
    1.67 +	unsigned char *pixels;
    1.68 +	unsigned short **zbuf;	/* zbuffer broken in 64k tiles */
    1.69 +};
    1.70 +
    1.71 +int mgl_rast_init(struct state *state, struct framebuffer *fbuf);
    1.72 +void mgl_rast_cleanup(void);
    1.73 +void mgl_rast_prepare(void);
    1.74 +void mgl_draw_point(struct vertex *v);
    1.75 +void mgl_draw_line(struct vertex *v0, struct vertex *v1);
    1.76 +void mgl_draw_poly(struct vertex *v, int numv);
    1.77 +
    1.78 +#endif	/* MGL_IMPL_H_ */