Fred Barnes / gfx3d

Basic 3D graphics for the MBED application-shield on-board LCD (initial/incomplete).

Dependents:   co657_lcdplay

gfx3d.h@5:2aaaf4e78a53, 2015-11-25 (annotated)

Committer:
co657_frmb
Date:
Wed Nov 25 23:58:07 2015 +0000
Revision:
5:2aaaf4e78a53
Parent:
4:7a9f0515d0a0
Child:
6:0bd002c936bb
Various updates, commit before optimising some stuff.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
co657_frmb 0:215c9308dc52 1 /*
co657_frmb 0:215c9308dc52 2 * gfx3d.h -- basic 3D graphics
co657_frmb 0:215c9308dc52 3 * Copyright (C) 2015 Fred Barnes, University of Kent <frmb@kent.ac.uk>
co657_frmb 0:215c9308dc52 4 */
co657_frmb 0:215c9308dc52 5
co657_frmb 0:215c9308dc52 6 /** @file gfx3d.h */
co657_frmb 0:215c9308dc52 7
co657_frmb 5:2aaaf4e78a53 8
co657_frmb 0:215c9308dc52 9 #ifndef __GFX3D_H
co657_frmb 0:215c9308dc52 10 #define __GFX3D_H
co657_frmb 0:215c9308dc52 11
co657_frmb 0:215c9308dc52 12 #include "C12832.h"
co657_frmb 0:215c9308dc52 13 #include "g3d_sintab.h"
co657_frmb 0:215c9308dc52 14
co657_frmb 0:215c9308dc52 15 /* NOTE: this assumes an ARM Cortex-M4 ish FPU, but might work elsewhere */
co657_frmb 0:215c9308dc52 16
co657_frmb 0:215c9308dc52 17 /* some basic types */
co657_frmb 0:215c9308dc52 18
co657_frmb 0:215c9308dc52 19 /** g3d_p3_t 3D single-precision point */
co657_frmb 0:215c9308dc52 20 typedef struct {
co657_frmb 0:215c9308dc52 21 float x, y, z;
co657_frmb 0:215c9308dc52 22 } g3d_p3_t;
co657_frmb 0:215c9308dc52 23
co657_frmb 0:215c9308dc52 24 /** g3d_2p3_t 2D integer point with original Z scaled */
co657_frmb 0:215c9308dc52 25 typedef struct {
co657_frmb 2:f62652cae975 26 int16_t x, y;
co657_frmb 3:2d8982c06eee 27 int16_t z;
co657_frmb 3:2d8982c06eee 28 int16_t dummy; /* fill out to 64 bits */
co657_frmb 3:2d8982c06eee 29 } __attribute__ ((packed)) g3d_2p3_t;
co657_frmb 3:2d8982c06eee 30
co657_frmb 3:2d8982c06eee 31 #define G3D_MAX_POLY_POINTS (3)
co657_frmb 3:2d8982c06eee 32
co657_frmb 3:2d8982c06eee 33 /** g3d_poly_t 2D integer triangular polygon, original Z scaled */
co657_frmb 3:2d8982c06eee 34 typedef struct {
co657_frmb 3:2d8982c06eee 35 g3d_2p3_t pts[G3D_MAX_POLY_POINTS];
co657_frmb 5:2aaaf4e78a53 36 uint16_t tx_pts[G3D_MAX_POLY_POINTS]; /* texture co-ords are 0xYYXX */
co657_frmb 3:2d8982c06eee 37 int32_t norm; /** face normal */
co657_frmb 3:2d8982c06eee 38 } g3d_poly_t;
co657_frmb 3:2d8982c06eee 39
co657_frmb 3:2d8982c06eee 40 /** g3d_edgebuf_t polygon edge-buffer */
co657_frmb 3:2d8982c06eee 41 typedef struct {
co657_frmb 3:2d8982c06eee 42 uint8_t start[64];
co657_frmb 3:2d8982c06eee 43 uint8_t end[64];
co657_frmb 3:2d8982c06eee 44 uint16_t zstart[64];
co657_frmb 3:2d8982c06eee 45 uint16_t zend[64];
co657_frmb 3:2d8982c06eee 46 uint16_t xoff, s_end;
co657_frmb 3:2d8982c06eee 47 } g3d_edgebuf_t;
co657_frmb 0:215c9308dc52 48
co657_frmb 2:f62652cae975 49 /** g3d_polyscan_t polygon scan-line type */
co657_frmb 2:f62652cae975 50 typedef struct {
co657_frmb 2:f62652cae975 51 uint8_t scans[32][2]; /* pairs of X-start X-end for each line of the display */
co657_frmb 3:2d8982c06eee 52 int32_t zscan[32][2]; /* similar, but with Z-depth information */
co657_frmb 3:2d8982c06eee 53 int scan_s, scan_e; /* scan start and end indices */
co657_frmb 2:f62652cae975 54 int32_t norm; /* calculated normal for the polygon (back-face cull) */
co657_frmb 2:f62652cae975 55 } g3d_polyscan_t;
co657_frmb 2:f62652cae975 56
co657_frmb 0:215c9308dc52 57 /** angle_t Type for angle (0-255 in unsigned char) */
co657_frmb 0:215c9308dc52 58 typedef uint8_t angle_t; /* working in a coarsely grained world: circle is 256 degrees */
co657_frmb 0:215c9308dc52 59
co657_frmb 0:215c9308dc52 60 /** g3d_cubepnts A set of 8 points representing a cube */
co657_frmb 0:215c9308dc52 61 static const g3d_p3_t g3d_cubepnts[] = {{-1.0, 1.0, 1.0}, {1.0, 1.0, 1.0}, {1.0, 1.0, -1.0}, {-1.0, 1.0, -1.0},
co657_frmb 0:215c9308dc52 62 {-1.0, -1.0, 1.0}, {1.0, -1.0, 1.0}, {1.0, -1.0, -1.0}, {-1.0, -1.0, -1.0}};
co657_frmb 0:215c9308dc52 63
co657_frmb 5:2aaaf4e78a53 64 /** g3d_xyfacepnts A set of 4 points representing a square in X-Y */
co657_frmb 5:2aaaf4e78a53 65 static const g3d_p3_t g3d_xyfacepnts[] = {{-1.0, -1.0, 0.0}, {1.0, -1.0, 0.0}, {1.0, 1.0, 0.0}, {-1.0, 1.0, 0.0}};
co657_frmb 5:2aaaf4e78a53 66
co657_frmb 0:215c9308dc52 67 /* some constants that describe the render target layout -- for the 128x32 LCD */
co657_frmb 0:215c9308dc52 68 #define G3D_X2_SHIFT (64)
co657_frmb 0:215c9308dc52 69 #define G3D_Y2_SHIFT (16)
co657_frmb 0:215c9308dc52 70
co657_frmb 3:2d8982c06eee 71 #define G3D_ZBADD (32.0f)
co657_frmb 4:7a9f0515d0a0 72 #define G3D_ZBSCALE (256.0f)
co657_frmb 0:215c9308dc52 73
co657_frmb 0:215c9308dc52 74 #define G3D_Z_DEPTH (12.0f)
co657_frmb 0:215c9308dc52 75 #define G3D_X_SCALE (120.0f)
co657_frmb 0:215c9308dc52 76 #define G3D_Y_SCALE (80.0f)
co657_frmb 0:215c9308dc52 77
co657_frmb 0:215c9308dc52 78
co657_frmb 0:215c9308dc52 79 extern "C" void gfx3d_rotate_demo (const g3d_p3_t *src, g3d_p3_t *dst, const int npnts, const angle_t a);
co657_frmb 5:2aaaf4e78a53 80 extern "C" void gfx3d_rotate_x (const g3d_p3_t *src, g3d_p3_t *dst, const int npnts, const angle_t a);
co657_frmb 5:2aaaf4e78a53 81 extern "C" void gfx3d_rotate_y (const g3d_p3_t *src, g3d_p3_t *dst, const int npnts, const angle_t a);
co657_frmb 5:2aaaf4e78a53 82 extern "C" void gfx3d_rotate_z (const g3d_p3_t *src, g3d_p3_t *dst, const int npnts, const angle_t a);
co657_frmb 5:2aaaf4e78a53 83 extern "C" void gfx3d_scale (const g3d_p3_t *src, g3d_p3_t *dst, const int npnts, const g3d_p3_t scl);
co657_frmb 0:215c9308dc52 84 extern "C" void gfx3d_translate (const g3d_p3_t *src, g3d_p3_t *dst, const int npnts, const g3d_p3_t tx);
co657_frmb 0:215c9308dc52 85 extern "C" void gfx3d_project (const g3d_p3_t *src, g3d_2p3_t *dst, const int npnts);
co657_frmb 3:2d8982c06eee 86 extern "C" void gfx3d_cubify_points (const g3d_2p3_t *src, g3d_poly_t *dst, int *npoly, const int backfaces);
co657_frmb 5:2aaaf4e78a53 87 extern "C" void gfx3d_squarify_points (const g3d_2p3_t *src, g3d_poly_t *dst, int *npoly, const int backfaces);
co657_frmb 3:2d8982c06eee 88
co657_frmb 3:2d8982c06eee 89 extern "C" void gfx3d_clear_zb (void);
co657_frmb 3:2d8982c06eee 90 extern "C" void gfx3d_sort_poly (g3d_poly_t *p);
co657_frmb 3:2d8982c06eee 91
co657_frmb 3:2d8982c06eee 92 extern "C" void gfx3d_wirepoly (const g3d_poly_t *src, C12832 &lcd);
co657_frmb 3:2d8982c06eee 93 extern "C" void gfx3d_wirepoly_z (const g3d_poly_t *src, C12832 &lcd);
co657_frmb 3:2d8982c06eee 94
co657_frmb 3:2d8982c06eee 95 extern "C" void gfx3d_edgebuf_z (const g3d_poly_t *src, g3d_edgebuf_t *dst);
co657_frmb 3:2d8982c06eee 96 extern "C" void gfx3d_wireedge (const g3d_edgebuf_t *edge, C12832 &lcd);
co657_frmb 3:2d8982c06eee 97
co657_frmb 5:2aaaf4e78a53 98 extern "C" void gfx3d_polytxmap (const g3d_poly_t *src, uint8_t *txbuf, C12832 &lcd);
co657_frmb 5:2aaaf4e78a53 99
co657_frmb 3:2d8982c06eee 100
co657_frmb 3:2d8982c06eee 101 #if 0
co657_frmb 3:2d8982c06eee 102 extern "C" void gfx3d_polyscan (const g3d_poly_t *src, g3d_polyscan_t *dst);
co657_frmb 3:2d8982c06eee 103 #endif
co657_frmb 0:215c9308dc52 104
co657_frmb 0:215c9308dc52 105 extern "C" void gfx3d_wirecube (const g3d_2p3_t *src, C12832 &lcd);
co657_frmb 0:215c9308dc52 106
co657_frmb 5:2aaaf4e78a53 107
co657_frmb 5:2aaaf4e78a53 108 static inline uint8_t g3d_texture_bit (const uint8_t *tx, int x, int y)
co657_frmb 5:2aaaf4e78a53 109 {
co657_frmb 5:2aaaf4e78a53 110 return (tx[(y << 2) | (x >> 3)] & (0x01 << (x & 0x07)));
co657_frmb 5:2aaaf4e78a53 111 }
co657_frmb 5:2aaaf4e78a53 112
co657_frmb 5:2aaaf4e78a53 113
co657_frmb 0:215c9308dc52 114 #endif /* !__GFX3D_H */