Fred Barnes / gfx3d

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

Dependents:   co657_lcdplay

gfx3d.h@4:7a9f0515d0a0, 2015-11-18 (annotated)

Committer:
co657_frmb
Date:
Wed Nov 18 10:34:25 2015 +0000
Revision:
4:7a9f0515d0a0
Parent:
3:2d8982c06eee
Child:
5:2aaaf4e78a53
Various updates for Z buffering and edge-buffer.

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 0:215c9308dc52 8 #ifndef __GFX3D_H
co657_frmb 0:215c9308dc52 9 #define __GFX3D_H
co657_frmb 0:215c9308dc52 10
co657_frmb 0:215c9308dc52 11 #include "C12832.h"
co657_frmb 0:215c9308dc52 12 #include "g3d_sintab.h"
co657_frmb 0:215c9308dc52 13
co657_frmb 0:215c9308dc52 14 /* NOTE: this assumes an ARM Cortex-M4 ish FPU, but might work elsewhere */
co657_frmb 0:215c9308dc52 15
co657_frmb 0:215c9308dc52 16 /* some basic types */
co657_frmb 0:215c9308dc52 17
co657_frmb 0:215c9308dc52 18 /** g3d_p3_t 3D single-precision point */
co657_frmb 0:215c9308dc52 19 typedef struct {
co657_frmb 0:215c9308dc52 20 float x, y, z;
co657_frmb 0:215c9308dc52 21 } g3d_p3_t;
co657_frmb 0:215c9308dc52 22
co657_frmb 0:215c9308dc52 23 /** g3d_2p3_t 2D integer point with original Z scaled */
co657_frmb 0:215c9308dc52 24 typedef struct {
co657_frmb 2:f62652cae975 25 int16_t x, y;
co657_frmb 3:2d8982c06eee 26 int16_t z;
co657_frmb 3:2d8982c06eee 27 int16_t dummy; /* fill out to 64 bits */
co657_frmb 3:2d8982c06eee 28 } __attribute__ ((packed)) g3d_2p3_t;
co657_frmb 3:2d8982c06eee 29
co657_frmb 3:2d8982c06eee 30 #define G3D_MAX_POLY_POINTS (3)
co657_frmb 3:2d8982c06eee 31
co657_frmb 3:2d8982c06eee 32 /** g3d_poly_t 2D integer triangular polygon, original Z scaled */
co657_frmb 3:2d8982c06eee 33 typedef struct {
co657_frmb 3:2d8982c06eee 34 g3d_2p3_t pts[G3D_MAX_POLY_POINTS];
co657_frmb 3:2d8982c06eee 35 int32_t norm; /** face normal */
co657_frmb 3:2d8982c06eee 36 } g3d_poly_t;
co657_frmb 3:2d8982c06eee 37
co657_frmb 3:2d8982c06eee 38 /** g3d_edgebuf_t polygon edge-buffer */
co657_frmb 3:2d8982c06eee 39 typedef struct {
co657_frmb 3:2d8982c06eee 40 uint8_t start[64];
co657_frmb 3:2d8982c06eee 41 uint8_t end[64];
co657_frmb 3:2d8982c06eee 42 uint16_t zstart[64];
co657_frmb 3:2d8982c06eee 43 uint16_t zend[64];
co657_frmb 3:2d8982c06eee 44 uint16_t xoff, s_end;
co657_frmb 3:2d8982c06eee 45 } g3d_edgebuf_t;
co657_frmb 0:215c9308dc52 46
co657_frmb 2:f62652cae975 47 /** g3d_polyscan_t polygon scan-line type */
co657_frmb 2:f62652cae975 48 typedef struct {
co657_frmb 2:f62652cae975 49 uint8_t scans[32][2]; /* pairs of X-start X-end for each line of the display */
co657_frmb 3:2d8982c06eee 50 int32_t zscan[32][2]; /* similar, but with Z-depth information */
co657_frmb 3:2d8982c06eee 51 int scan_s, scan_e; /* scan start and end indices */
co657_frmb 2:f62652cae975 52 int32_t norm; /* calculated normal for the polygon (back-face cull) */
co657_frmb 2:f62652cae975 53 } g3d_polyscan_t;
co657_frmb 2:f62652cae975 54
co657_frmb 0:215c9308dc52 55 /** angle_t Type for angle (0-255 in unsigned char) */
co657_frmb 0:215c9308dc52 56 typedef uint8_t angle_t; /* working in a coarsely grained world: circle is 256 degrees */
co657_frmb 0:215c9308dc52 57
co657_frmb 0:215c9308dc52 58 /** g3d_cubepnts A set of 8 points representing a cube */
co657_frmb 0:215c9308dc52 59 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 60 {-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 61
co657_frmb 0:215c9308dc52 62 /* some constants that describe the render target layout -- for the 128x32 LCD */
co657_frmb 0:215c9308dc52 63 #define G3D_X2_SHIFT (64)
co657_frmb 0:215c9308dc52 64 #define G3D_Y2_SHIFT (16)
co657_frmb 0:215c9308dc52 65
co657_frmb 3:2d8982c06eee 66 #define G3D_ZBADD (32.0f)
co657_frmb 4:7a9f0515d0a0 67 #define G3D_ZBSCALE (256.0f)
co657_frmb 0:215c9308dc52 68
co657_frmb 0:215c9308dc52 69 #define G3D_Z_DEPTH (12.0f)
co657_frmb 0:215c9308dc52 70 #define G3D_X_SCALE (120.0f)
co657_frmb 0:215c9308dc52 71 #define G3D_Y_SCALE (80.0f)
co657_frmb 0:215c9308dc52 72
co657_frmb 0:215c9308dc52 73
co657_frmb 0:215c9308dc52 74 extern "C" void gfx3d_rotate_demo (const g3d_p3_t *src, g3d_p3_t *dst, const int npnts, const angle_t a);
co657_frmb 0:215c9308dc52 75 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 76 extern "C" void gfx3d_project (const g3d_p3_t *src, g3d_2p3_t *dst, const int npnts);
co657_frmb 3:2d8982c06eee 77 extern "C" void gfx3d_cubify_points (const g3d_2p3_t *src, g3d_poly_t *dst, int *npoly, const int backfaces);
co657_frmb 3:2d8982c06eee 78
co657_frmb 3:2d8982c06eee 79 extern "C" void gfx3d_clear_zb (void);
co657_frmb 3:2d8982c06eee 80 extern "C" void gfx3d_sort_poly (g3d_poly_t *p);
co657_frmb 3:2d8982c06eee 81
co657_frmb 3:2d8982c06eee 82 extern "C" void gfx3d_wirepoly (const g3d_poly_t *src, C12832 &lcd);
co657_frmb 3:2d8982c06eee 83 extern "C" void gfx3d_wirepoly_z (const g3d_poly_t *src, C12832 &lcd);
co657_frmb 3:2d8982c06eee 84
co657_frmb 3:2d8982c06eee 85 extern "C" void gfx3d_edgebuf_z (const g3d_poly_t *src, g3d_edgebuf_t *dst);
co657_frmb 3:2d8982c06eee 86 extern "C" void gfx3d_wireedge (const g3d_edgebuf_t *edge, C12832 &lcd);
co657_frmb 3:2d8982c06eee 87
co657_frmb 3:2d8982c06eee 88
co657_frmb 3:2d8982c06eee 89 #if 0
co657_frmb 3:2d8982c06eee 90 extern "C" void gfx3d_polyscan (const g3d_poly_t *src, g3d_polyscan_t *dst);
co657_frmb 3:2d8982c06eee 91 #endif
co657_frmb 0:215c9308dc52 92
co657_frmb 0:215c9308dc52 93 extern "C" void gfx3d_wirecube (const g3d_2p3_t *src, C12832 &lcd);
co657_frmb 0:215c9308dc52 94
co657_frmb 0:215c9308dc52 95 #endif /* !__GFX3D_H */