nuclear@0: /*
nuclear@0: 256-color 3D graphics hack for real-mode DOS.
nuclear@0: Copyright (C) 2011  John Tsiombikas <nuclear@member.fsf.org>
nuclear@0: 
nuclear@0: This program is free software: you can redistribute it and/or modify
nuclear@0: it under the terms of the GNU General Public License as published by
nuclear@0: the Free Software Foundation, either version 3 of the License, or
nuclear@0: (at your option) any later version.
nuclear@0: 
nuclear@0: This program is distributed in the hope that it will be useful,
nuclear@0: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@0: GNU General Public License for more details.
nuclear@0: 
nuclear@0: You should have received a copy of the GNU General Public License
nuclear@0: along with this program.  If not, see <http://www.gnu.org/licenses/>.
nuclear@0: */
nuclear@0: #ifndef MGL_IMPL_H_
nuclear@0: #define MGL_IMPL_H_
nuclear@0: 
nuclear@0: #define MATRIX_STACK_SIZE	8
nuclear@0: #define MAX_LIGHTS			4
nuclear@0: 
nuclear@9: #define ZTILE_SIZE			16384
nuclear@9: #define ZTILE_SHIFT			14
nuclear@9: #define ZTILE_MASK			0x3fff
nuclear@9: 
nuclear@9: #define ZTILE(x)			(((x) & ~ZTILE_MASK) >> ZTILE_SHIFT)
nuclear@9: #define ZTILE_OFFS(x)		((x) & ZTILE_MASK)
nuclear@9: 
nuclear@0: #define ROUND(x)	((x) >= 0.0 ? (x) + 0.5 : (x) - 0.5)
nuclear@0: 
nuclear@0: typedef struct {
nuclear@0: 	float x, y, z, w;
nuclear@0: } vec4_t;
nuclear@0: 
nuclear@0: typedef struct {
nuclear@0: 	float x, y, z;
nuclear@0: } vec3_t;
nuclear@0: 
nuclear@0: typedef struct {
nuclear@0: 	float x, y;
nuclear@0: } vec2_t;
nuclear@0: 
nuclear@0: typedef float mat4_t[16];
nuclear@0: 
nuclear@0: struct vertex {
nuclear@0: 	vec4_t pos;
nuclear@0: 	vec3_t norm;
nuclear@0: 	vec2_t tc;
nuclear@0: 	float energy;
nuclear@0: 	int cidx;
nuclear@0: };
nuclear@0: 
nuclear@3: struct texture {
nuclear@3: 	int width, height;
nuclear@3: 	int xshift, yshift;
nuclear@3: 	unsigned int xmask, ymask;
nuclear@3: 	unsigned char *pixels;
nuclear@3: };
nuclear@3: 
nuclear@0: struct state {
nuclear@0: 	unsigned int flags;
nuclear@0: 	int ord, frontface, cullface;
nuclear@0: 	int mmode, mtop[2];
nuclear@0: 	mat4_t matrix[2][MATRIX_STACK_SIZE];
nuclear@0: 	int prim;
nuclear@0: 	struct vertex curv, v[4];
nuclear@0: 	int vidx;
nuclear@0: 	int vp[4];	/* viewport */
nuclear@0: 	int col_range;	/* color interpolation range */
nuclear@0: 	vec3_t ldir[MAX_LIGHTS];
nuclear@0: 	float lint[MAX_LIGHTS];
nuclear@3: 
nuclear@3: 	struct texture tex;
nuclear@0: };
nuclear@0: 
nuclear@0: struct framebuffer {
nuclear@0: 	int width, height;
nuclear@0: 	unsigned char *pixels;
nuclear@9: 	unsigned short **zbuf;	/* zbuffer broken in ZTILE_SIZE tiles */
nuclear@9: 	int num_ztiles;
nuclear@0: };
nuclear@0: 
nuclear@3: 
nuclear@0: int mgl_rast_init(struct state *state, struct framebuffer *fbuf);
nuclear@0: void mgl_rast_cleanup(void);
nuclear@0: void mgl_rast_prepare(void);
nuclear@0: void mgl_draw_point(struct vertex *v);
nuclear@0: void mgl_draw_line(struct vertex *v0, struct vertex *v1);
nuclear@0: void mgl_draw_poly(struct vertex *v, int numv);
nuclear@0: 
nuclear@0: #endif	/* MGL_IMPL_H_ */