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1 /*
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2 256-color 3D graphics hack for real-mode DOS.
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3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18 #ifndef MGL_IMPL_H_
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19 #define MGL_IMPL_H_
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20
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21 #define MATRIX_STACK_SIZE 8
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22 #define MAX_LIGHTS 4
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23
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24 #define ZTILE_SIZE 16384
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25 #define ZTILE_SHIFT 14
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26 #define ZTILE_MASK 0x3fff
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27
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28 #define ZTILE(x) (((x) & ~ZTILE_MASK) >> ZTILE_SHIFT)
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29 #define ZTILE_OFFS(x) ((x) & ZTILE_MASK)
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30
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31 #define ROUND(x) ((x) >= 0.0 ? (x) + 0.5 : (x) - 0.5)
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32
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33 typedef struct {
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34 float x, y, z, w;
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35 } vec4_t;
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36
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37 typedef struct {
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38 float x, y, z;
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39 } vec3_t;
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40
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41 typedef struct {
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42 float x, y;
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43 } vec2_t;
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44
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45 typedef float mat4_t[16];
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46
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47 struct vertex {
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48 vec4_t pos;
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49 vec3_t norm;
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50 vec2_t tc;
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51 float energy;
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52 int cidx;
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53 };
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54
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55 struct texture {
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56 int width, height;
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57 int xshift, yshift;
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nuclear@3
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58 unsigned int xmask, ymask;
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59 unsigned char *pixels;
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60 };
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61
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62 struct state {
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63 unsigned int flags;
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64 int ord, frontface, cullface;
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65 int mmode, mtop[2];
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66 mat4_t matrix[2][MATRIX_STACK_SIZE];
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67 int prim;
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68 struct vertex curv, v[4];
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69 int vidx;
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70 int vp[4]; /* viewport */
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71 int col_range; /* color interpolation range */
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72 vec4_t lpos[MAX_LIGHTS];
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73 float lint[MAX_LIGHTS];
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74
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75 struct texture tex;
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76 };
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77
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78 struct framebuffer {
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79 int width, height;
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80 unsigned char *pixels;
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81 unsigned short **zbuf; /* zbuffer broken in ZTILE_SIZE tiles */
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82 int num_ztiles;
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83 };
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84
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85
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86 int mgl_rast_init(struct state *state, struct framebuffer *fbuf);
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87 void mgl_rast_cleanup(void);
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88 void mgl_rast_prepare(void);
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89 void mgl_draw_point(struct vertex *v);
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90 void mgl_draw_line(struct vertex *v0, struct vertex *v1);
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91 void mgl_draw_poly(struct vertex *v, int numv);
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92
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93 #endif /* MGL_IMPL_H_ */
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