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76 lines
2.2 KiB
76 lines
2.2 KiB
/**
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* @file 3d.h
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* @brief Fixed-point 3D graphics engine
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*
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* Provides matrix-based 3D transformations and rendering primitives
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* for the Channel3 video output. Uses 256 = 1.0 fixed-point math.
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*
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* Original Copyright 2015 <>< Charles Lohr
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* ESP32 Port 2024
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*/
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#ifndef _3D_H
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#define _3D_H
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#include <stdint.h>
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#include "video_broadcast.h"
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// External references
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extern int gframe;
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extern uint8_t *frontframe;
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extern int16_t ProjectionMatrix[16];
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extern int16_t ModelviewMatrix[16];
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extern int CNFGPenX, CNFGPenY;
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extern uint8_t CNFGBGColor;
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extern uint8_t CNFGLastColor;
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extern uint8_t CNFGDialogColor;
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// Drawing primitives
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void CNFGTackSegment(int x0, int y0, int x1, int y1);
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int LABS(int x);
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// Pixel plotting function pointer (set by CNFGColor)
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extern void (*CNFGTackPixel)(int x, int y);
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// Coordinate transformation
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void LocalToScreenspace(int16_t *coords_3v, int16_t *o1, int16_t *o2);
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// Trigonometry (lookup table based)
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int16_t tdSIN(uint8_t iv);
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int16_t tdCOS(uint8_t iv);
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/**
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* @brief Set drawing color
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* @param col Color value:
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* 0-15: Standard density colors
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* 16: Black, double-density
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* 17: White, double-density
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*/
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void CNFGColor(uint8_t col);
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// Matrix operations
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void tdTranslate(int16_t *f, int16_t x, int16_t y, int16_t z);
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void tdScale(int16_t *f, int16_t x, int16_t y, int16_t z);
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void tdRotateEA(int16_t *f, int16_t x, int16_t y, int16_t z);
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void tdMultiply(int16_t *fin1, int16_t *fin2, int16_t *fout);
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void tdPTransform(int16_t *pin, int16_t *f, int16_t *pout);
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void td4Transform(int16_t *pin, int16_t *f, int16_t *pout);
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void MakeTranslate(int x, int y, int z, int16_t *out);
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void Perspective(int fovx, int aspect, int zNear, int zFar, int16_t *out);
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void tdIdentity(int16_t *matrix);
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void MakeYRotationMatrix(uint8_t angle, int16_t *f);
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void MakeXRotationMatrix(uint8_t angle, int16_t *f);
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// High-level drawing
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void DrawGeoSphere(void);
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void Draw3DSegment(int16_t *c1, int16_t *c2);
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void CNFGDrawText(const char *text, int scale);
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void CNFGDrawBox(int x1, int y1, int x2, int y2);
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void CNFGTackRectangle(short x1, short y1, short x2, short y2);
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// Perlin noise
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int16_t tdPerlin2D(int16_t x, int16_t y);
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int16_t tdFLerp(int16_t a, int16_t b, int16_t t);
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int16_t tdNoiseAt(int16_t x, int16_t y);
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#endif // _3D_H
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