/
termgl.c
1405 lines (1269 loc) · 38.3 KB
/
termgl.c
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/*
* Copyright (c) 2021-2023 Wojciech Graj
*
* Licensed under the MIT license: https://opensource.org/licenses/MIT
* Permission is granted to use, copy, modify, and redistribute the work.
* Full license information available in the project LICENSE file.
**/
#include "termgl.h"
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/**
* Setting MACROs
*/
#define TGL_CLEAR_SCR \
do { \
fputs("\033[1;1H\033[2J", stdout); \
} while (0)
#define TGL_TYPEOF __typeof__
#define TGL_MALLOC malloc
#define TGL_FREE free
#define TGL_LIKELY(x_) __builtin_expect((x_), 1)
#define TGL_UNLIKELY(x_) __builtin_expect((x_), 0)
#define TGL_UNREACHABLE() __builtin_unreachable()
#ifdef TGL_OS_WINDOWS
#include <windows.h>
#define WINDOWS_CALL(cond_, retval_) \
do { \
if (TGL_UNLIKELY(cond_)) { \
errno = GetLastError(); \
return retval_; \
} \
} while (0)
#endif
typedef struct Pixel {
char v_char;
TGLPixFmt color;
} Pixel;
struct TGL {
unsigned width;
unsigned height;
int max_x;
int max_y;
unsigned frame_size;
Pixel *frame_buffer;
float *z_buffer;
char *output_buffer;
unsigned output_buffer_size;
bool z_buffer_enabled;
uint8_t settings;
};
#define SWAP(a_, b_) \
do { \
TGL_TYPEOF(a_) \
temp_ = a_; \
a_ = b_; \
b_ = temp_; \
} while (0)
#define MIN(a_, b_) (((a_) < (b_)) ? (a_) : (b_))
#define MAX(a_, b_) (((a_) > (b_)) ? (a_) : (b_))
#define XOR(a_, b_) (((bool)(a_)) != ((bool)(b_)))
#define SET_PIXEL_RAW(tgl_, x_, y_, v_char_, color_) \
do { \
*(&tgl_->frame_buffer[y_ * tgl_->width + x_]) = (Pixel){ \
.v_char = v_char_, \
.color = color_, \
}; \
} while (0)
#define SET_PIXEL(tgl_, x_, y_, z_, u_, v_, t_, data_) \
do { \
char c_; \
TGLPixFmt color_; \
if (!tgl_->z_buffer_enabled) { \
t_(u_, v_, &color_, &c_, data_); \
SET_PIXEL_RAW(tgl_, x_, y_, c_, color_); \
} else if (z_ >= tgl_->z_buffer[y_ * tgl_->width + x_]) { \
t_(u_, v_, &color_, &c_, data_); \
SET_PIXEL_RAW(tgl_, x_, y_, c_, color_); \
tgl->z_buffer[y_ * tgl_->width + x_] = z_; \
} \
} while (0)
#define CALL(stmt_, retval_) \
do { \
if (TGL_UNLIKELY(stmt_)) \
return retval_; \
} while (0)
#define CALL_STDOUT(stmt_, retval_) CALL((stmt_) == EOF, retval_)
#define MIX(begin, end, d) ((begin) * (d) + (end) * (1 - (d)))
#define RGB_EQ(rgb0, rgb1) (((rgb0).r == (rgb1).r) && ((rgb0).g == (rgb1).g) && ((rgb0).b == (rgb1).b))
#define COLOR_EQ(color0, color1) (!(((color0).flags ^ (color1).flags) & TGL_RGB24) \
&& (((color0).flags & TGL_RGB24) ? (RGB_EQ((color0).color.rgb, (color1).color.rgb)) : ((color0).color.indexed == (color1).color.indexed)))
#define PIXFMT_EQ(color0, color1) (COLOR_EQ((color0).fg, (color1).fg) && COLOR_EQ((color0).bkg, (color1).bkg))
#ifndef TERMGL_MINIMAL
const TGLGradient gradient_full = {
.length = 70,
.grad = " .'`^\",:;Il!i><~+_-?][}{1)(|\\/tfjrxnuvczXYUJCLQ0OZmwqpdbkhao*#MW&8%B@$",
};
const TGLGradient gradient_min = {
.length = 10,
.grad = " .:-=+*#%@",
};
#endif /* ~TERMGL_MINIMAL */
static void itgl_clip(const TGL *tgl, int *x, int *y);
static inline char *itgl_generate_sgr_rgb_channel(const uint8_t val, char *buf);
static char *itgl_generate_sgr_rgb(const TGLRGB rgb, char *buf);
char *itgl_generate_sgr(const TGLPixFmt color_prev, const TGLPixFmt color_cur, char *buf);
static void itgl_horiz_line(TGL *tgl, int x0, float z0, uint8_t u0, uint8_t v0, int x1, float z1, uint8_t u1, uint8_t v1, int y, TGLPixelShader *t, const void *data);
#ifndef TERMGL_MINIMAL
void tgl_pixel_shader_simple(const uint8_t u, const uint8_t v, TGLPixFmt *const color, char *const c, const void *const data)
{
const TGLPixelShaderSimple *const interp = data;
*color = interp->color;
*c = tgl_grad_char(interp->grad, u + v);
(void)v;
}
void tgl_pixel_shader_texture(uint8_t u, uint8_t v, TGLPixFmt *const color, char *const c, const void *data)
{
const TGLPixelShaderTexture *const shader = data;
const unsigned idx = u * shader->width / 256 + shader->width * (v * shader->height / 256);
*color = shader->colors[idx];
*c = shader->chars[idx];
}
char tgl_grad_char(const TGLGradient *const grad, const uint8_t intensity)
{
return grad->grad[grad->length * intensity / 256u];
}
#endif /* ~TERMGL_MINIMAL */
inline void itgl_clip(const TGL *const tgl, int *const x, int *const y)
{
*x = MAX(MIN(tgl->max_x, *x), 0);
*y = MAX(MIN(tgl->max_y, *y), 0);
}
int tgl_boot(void)
{
#ifdef TGL_OS_WINDOWS
const HANDLE hOutputHandle = GetStdHandle(STD_OUTPUT_HANDLE);
WINDOWS_CALL(hOutputHandle == INVALID_HANDLE_VALUE, -1);
DWORD mode;
WINDOWS_CALL(!GetConsoleMode(hOutputHandle, &mode), -1);
mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
WINDOWS_CALL(!SetConsoleMode(hOutputHandle, mode), -1);
const HANDLE hInputHandle = GetStdHandle(STD_INPUT_HANDLE);
WINDOWS_CALL(hInputHandle == INVALID_HANDLE_VALUE, -1);
WINDOWS_CALL(!GetConsoleMode(hInputHandle, &mode), -1);
mode &= ~(ENABLE_MOUSE_INPUT | ENABLE_WINDOW_INPUT | ENABLE_QUICK_EDIT_MODE);
WINDOWS_CALL(!SetConsoleMode(hInputHandle, mode), -1);
#endif
return 0;
}
void tgl_clear(TGL *const tgl, const uint8_t buffers)
{
unsigned i;
if (buffers & TGL_FRAME_BUFFER) {
for (i = 0; i < tgl->frame_size; i++) {
*(&tgl->frame_buffer[i]) = (Pixel){
.v_char = ' ',
.color = (TGLPixFmt){ 0 },
};
}
}
if (buffers & TGL_Z_BUFFER)
for (i = 0; i < tgl->frame_size; i++)
tgl->z_buffer[i] = -1.f;
if (buffers & TGL_OUTPUT_BUFFER)
memset(tgl->output_buffer, '\0', tgl->output_buffer_size);
}
void tgl_clear_screen(void)
{
TGL_CLEAR_SCR;
}
TGL *tgl_init(const unsigned width, const unsigned height)
{
TGL *const tgl = TGL_MALLOC(sizeof(TGL));
if (!tgl)
return NULL;
*tgl = (TGL){
.width = width,
.height = height,
.max_x = width - 1,
.max_y = height - 1,
.frame_size = width * height,
.frame_buffer = TGL_MALLOC(sizeof(Pixel) * width * height),
};
if (!tgl->frame_buffer) {
TGL_FREE(tgl);
return NULL;
}
tgl_clear(tgl, TGL_FRAME_BUFFER);
return tgl;
}
inline char *itgl_generate_sgr_rgb_channel(const uint8_t val, char *buf)
{
*buf++ = ';';
if (val >= 10) {
if (val >= 100)
*buf++ = (val / 100u) + '0';
*buf++ = ((val % 100u) / 10u) + '0';
}
*buf++ = (val % 10u) + '0';
return buf;
}
char *itgl_generate_sgr_rgb(const TGLRGB rgb, char *buf)
{
*buf++ = '8';
*buf++ = ';';
*buf++ = '2';
buf = itgl_generate_sgr_rgb_channel(rgb.r, buf);
buf = itgl_generate_sgr_rgb_channel(rgb.g, buf);
buf = itgl_generate_sgr_rgb_channel(rgb.b, buf);
return buf;
}
char *itgl_generate_sgr(const TGLPixFmt color_prev, const TGLPixFmt color_cur, char *buf)
{
const uint8_t enable = color_cur.fg.flags & ~color_prev.fg.flags;
const uint8_t disable = color_prev.fg.flags & ~color_cur.fg.flags;
bool flag_delim = false;
*buf++ = '\033';
*buf++ = '[';
/* BOLD */
if (disable & TGL_BOLD) {
*buf++ = '2';
*buf++ = '2';
flag_delim = true;
} else if (enable & TGL_BOLD) {
*buf++ = '1';
flag_delim = true;
}
/* UNDERLINE */
if (disable & TGL_UNDERLINE) {
if (flag_delim)
*buf++ = ';';
else
flag_delim = true;
*buf++ = '2';
*buf++ = '4';
} else if (enable & TGL_UNDERLINE) {
if (flag_delim)
*buf++ = ';';
else
flag_delim = true;
*buf++ = '4';
}
/* FOREGROUND */
if (color_cur.fg.flags & TGL_RGB24) {
if (!RGB_EQ(color_cur.fg.color.rgb, color_prev.fg.color.rgb)) {
if (flag_delim)
*buf++ = ';';
else
flag_delim = true;
*buf++ = '3';
buf = itgl_generate_sgr_rgb(color_cur.fg.color.rgb, buf);
}
} else if ((color_prev.fg.flags & TGL_RGB24)
|| (color_prev.fg.color.indexed != color_cur.fg.color.indexed)) {
if (flag_delim)
*buf++ = ';';
else
flag_delim = true;
*buf++ = (color_cur.fg.color.indexed & TGL_HIGH_INTENSITY) ? '9' : '3';
*buf++ = (color_cur.fg.color.indexed & 0x07) + '0';
}
/* BACKGROUND */
if (color_cur.bkg.flags & TGL_RGB24) {
if (!RGB_EQ(color_cur.bkg.color.rgb, color_prev.bkg.color.rgb)) {
if (flag_delim)
*buf++ = ';';
*buf++ = '4';
buf = itgl_generate_sgr_rgb(color_cur.bkg.color.rgb, buf);
}
} else if ((color_prev.bkg.flags & TGL_RGB24)
|| (color_prev.bkg.color.indexed != color_cur.bkg.color.indexed)) {
if (flag_delim)
*buf++ = ';';
else
flag_delim = true;
if (color_cur.bkg.color.indexed & TGL_HIGH_INTENSITY) {
*buf++ = '1';
*buf++ = '0';
} else {
*buf++ = '4';
}
*buf++ = (color_cur.bkg.color.indexed & 0x07) + '0';
}
*buf++ = 'm';
return buf;
}
int tgl_flush(TGL *const tgl)
{
if (tgl->settings & TGL_PROGRESSIVE)
CALL_STDOUT(fputs("\033[;H", stdout), -1);
else
TGL_CLEAR_SCR;
TGLPixFmt color = TGL_PIXFMT(TGL_IDX(TGL_WHITE));
unsigned row, col;
Pixel *pixel = tgl->frame_buffer;
const bool double_chars = tgl->settings & TGL_DOUBLE_CHARS;
const bool double_width = tgl->settings & TGL_DOUBLE_WIDTH;
if (tgl->output_buffer_size) {
char *output_buffer_loc = tgl->output_buffer;
for (row = 0; row < tgl->height; row++) {
if (double_width) {
*output_buffer_loc++ = '\033';
*output_buffer_loc++ = '#';
*output_buffer_loc++ = '6';
}
for (col = 0; col < tgl->width; col++) {
if (!PIXFMT_EQ(color, pixel->color)) {
output_buffer_loc = itgl_generate_sgr(color, pixel->color, output_buffer_loc);
color = pixel->color;
}
*output_buffer_loc++ = pixel->v_char;
if (double_chars)
*output_buffer_loc++ = pixel->v_char;
pixel++;
}
*output_buffer_loc++ = '\n';
}
*output_buffer_loc++ = '\033';
*output_buffer_loc++ = '[';
*output_buffer_loc++ = '0';
*output_buffer_loc = 'm';
CALL_STDOUT(fputs(tgl->output_buffer, stdout), -1);
} else {
for (row = 0; row < tgl->height; row++) {
if (double_width)
CALL_STDOUT(fputs("\033#6", stdout), -1);
for (col = 0; col < tgl->width; col++) {
if (!PIXFMT_EQ(color, pixel->color)) {
char buf[16];
*itgl_generate_sgr(color, pixel->color, buf) = '\0';
color = pixel->color;
CALL_STDOUT(fputs(buf, stdout), -1);
}
CALL_STDOUT(putchar(pixel->v_char), -1);
if (double_chars)
CALL_STDOUT(putchar(pixel->v_char), -1);
pixel++;
}
CALL_STDOUT(putchar('\n'), -1);
}
CALL_STDOUT(fputs("\033[0m", stdout), -1);
}
CALL_STDOUT(fflush(stdout), -1);
return 0;
}
void tgl_putchar(TGL *const tgl, int x, int y, const char c, const TGLPixFmt color)
{
itgl_clip(tgl, &x, &y);
SET_PIXEL_RAW(tgl, x, y, c, color);
}
void tgl_puts(TGL *const tgl, const int x, int y, const char *str, const TGLPixFmt color)
{
int cur_x = x;
while (*str) {
if (TGL_UNLIKELY(*str == '\n')) {
cur_x = x;
y++;
str++;
continue;
}
itgl_clip(tgl, &cur_x, &y);
SET_PIXEL_RAW(tgl, cur_x, y, *str, color);
cur_x++;
str++;
}
}
void tgl_point(TGL *const tgl, TGLVert v0, TGLPixelShader *const t, const void *const data)
{
itgl_clip(tgl, &v0.x, &v0.y);
SET_PIXEL(tgl, v0.x, v0.y, v0.z, v0.u, v0.v, t, data);
}
/* Bresenham's line algorithm */
void tgl_line(TGL *const tgl, TGLVert v0, TGLVert v1, TGLPixelShader *const t, const void *const data)
{
itgl_clip(tgl, &v0.x, &v0.y);
itgl_clip(tgl, &v1.x, &v1.y);
if (abs(v1.y - v0.y) < abs(v1.x - v0.x)) {
if (v0.x > v1.x) {
SWAP(v1, v0);
}
const int dx = v1.x - v0.x;
int dy = v1.y - v0.y;
int yi;
if (dy > 0) {
yi = 1;
} else {
yi = -1;
dy *= -1;
}
int d = (dy + dy) - dx;
int y = v0.y;
int x;
for (x = v0.x; x <= v1.x; x++) {
SET_PIXEL(tgl, x, y,
((x - v0.x) * v1.z + (v0.x - x) * v1.z) / dx,
((x - v0.x) * v1.u + (v1.x - x) * v0.u) / dx,
((x - v0.x) * v1.v + (v1.x - x) * v0.v) / dx,
t, data);
if (d > 0) {
y += yi;
d += 2 * (dy - dx);
} else {
d += dy + dy;
}
}
} else {
if (v0.y > v1.y) {
SWAP(v1, v0);
}
int dx = v1.x - v0.x;
const int dy = v1.y - v0.y;
int xi;
if (dx > 0) {
xi = 1;
} else {
xi = -1;
dx *= -1;
}
int d = (dx + dx) - dy;
int x = v0.x;
int y;
for (y = v0.y; y <= v1.y; y++) {
SET_PIXEL(tgl, x, y,
((y - v0.y) * v1.z + (v1.y - y) * v0.z) / dx,
((y - v0.y) * v1.u + (v1.y - y) * v0.u) / dy,
((y - v0.y) * v1.v + (v1.y - y) * v0.v) / dy,
t, data);
if (d > 0) {
x += xi;
d += 2 * (dx - dy);
} else {
d += dx + dx;
}
}
}
}
void tgl_triangle(TGL *const tgl, TGLVert v0, TGLVert v1, TGLVert v2, TGLPixelShader *const t, const void *data)
{
tgl_line(tgl, v0, v1, t, data);
tgl_line(tgl, v0, v2, t, data);
tgl_line(tgl, v1, v2, t, data);
}
void itgl_horiz_line(TGL *const tgl, const int x0, const float z0, const uint8_t u0, const uint8_t v0, const int x1, const float z1, const uint8_t u1, const uint8_t v1, const int y, TGLPixelShader *t, const void *const data)
{
if (x0 == x1) {
SET_PIXEL(tgl, x0, y, z0, u0, v0, t, data);
} else {
const int dx = x1 - x0;
int x;
for (x = x0; x <= x1; x++) {
SET_PIXEL(tgl, x, y,
((x - x0) * z1 + (x1 - x) * z0) / dx,
((x - x0) * u1 + (x1 - x) * u0) / dx,
((x - x0) * v1 + (x1 - x) * v0) / dx,
t, data);
}
}
}
/* Solution based on Bresenham's line algorithm
* adapted from: https://github.com/OneLoneCoder/videos/blob/master/olcConsoleGameEngine.h
**/
void tgl_triangle_fill(TGL *const tgl, TGLVert v0, TGLVert v1, TGLVert v2, TGLPixelShader *const t, const void *data)
{
itgl_clip(tgl, &v0.x, &v0.y);
itgl_clip(tgl, &v1.x, &v1.y);
itgl_clip(tgl, &v2.x, &v2.y);
if (v1.y < v0.y) {
SWAP(v1, v0);
}
if (v2.y < v0.y) {
SWAP(v2, v0);
}
if (v2.y < v1.y) {
SWAP(v1, v2);
}
int t0xp, t1xp, minx, maxx, t0x, t1x;
t0x = t1x = v0.x;
int y = v0.y;
int dx0 = v1.x - v0.x;
int signx0, signx1;
bool changed0, changed1;
changed0 = changed1 = false;
if (dx0 < 0) {
dx0 *= -1;
signx0 = -1;
} else {
signx0 = 1;
}
int dy0 = v1.y - v0.y;
int dx1 = v2.x - v0.x;
if (dx1 < 0) {
dx1 = -dx1;
signx1 = -1;
} else {
signx1 = 1;
}
int dy1 = v2.y - v0.y;
if (dy0 > dx0) {
SWAP(dx0, dy0);
changed0 = true;
}
if (dy1 > dx1) {
SWAP(dx1, dy1);
changed1 = true;
}
int e1 = dx1 >> 1;
int e0;
if (v0.y == v1.y)
goto LBL_NEXT;
e0 = dx0 >> 1;
for (int i = 0; i < dx0;) {
t0xp = t1xp = 0;
if (t0x < t1x) {
minx = t0x;
maxx = t1x;
} else {
minx = t1x;
maxx = t0x;
}
while (i < dx0) {
i++;
e0 += dy0;
while (e0 >= dx0) {
e0 -= dx0;
if (changed0)
t0xp = signx0;
else
goto LBL_NEXT1;
}
if (changed0)
break;
else
t0x += signx0;
}
/* Move line */
LBL_NEXT1:
/* process second line until y value is about to change */
while (true) {
e1 += dy1;
while (e1 >= dx1) {
e1 -= dx1;
if (changed1)
t1xp = signx1;
else
goto LBL_NEXT2;
}
if (changed1)
break;
else
t1x += signx1;
}
LBL_NEXT2:
if (minx > t0x)
minx = t0x;
if (minx > t1x)
minx = t1x;
if (maxx < t0x)
maxx = t0x;
if (maxx < t1x)
maxx = t1x;
const uint8_t vu0 = ((y - v0.y) * v1.u + (v1.y - y) * v0.u) / (v1.y - v0.y);
const uint8_t vv0 = ((y - v0.y) * v1.v + (v1.y - y) * v0.v) / (v1.y - v0.y);
const uint8_t vu1 = ((y - v0.y) * v2.u + (v2.y - y) * v0.u) / (v2.y - v0.y);
const uint8_t vv1 = ((y - v0.y) * v2.v + (v2.y - y) * v0.v) / (v2.y - v0.y);
const float vz0 = ((y - v0.y) * v1.z + (v1.y - y) * v0.z) / (v1.y - v0.y);
const float vz1 = ((y - v0.y) * v2.z + (v2.y - y) * v0.z) / (v2.y - v0.y);
if (t0x < t1x)
itgl_horiz_line(tgl, minx, vz0, vu0, vv0, maxx, vz1, vu1, vv1, y, t, data);
else
itgl_horiz_line(tgl, minx, vz1, vu1, vv1, maxx, vz0, vu0, vv0, y, t, data);
if (!changed0)
t0x += signx0;
t0x += t0xp;
if (!changed1)
t1x += signx1;
t1x += t1xp;
y += 1;
if (y == v1.y)
break;
}
LBL_NEXT:
/* Second half */
dx0 = v2.x - v1.x;
if (dx0 < 0) {
dx0 *= -1;
signx0 = -1;
} else {
signx0 = 1;
}
dy0 = v2.y - v1.y;
t0x = v1.x;
if (dy0 > dx0) {
SWAP(dy0, dx0);
changed0 = true;
} else {
changed0 = false;
}
e0 = dx0 >> 1;
for (int i = 0; i <= dx0; i++) {
t0xp = t1xp = 0;
if (t0x < t1x) {
minx = t0x;
maxx = t1x;
} else {
minx = t1x;
maxx = t0x;
}
while (i < dx0) {
e0 += dy0;
while (e0 >= dx0) {
e0 -= dx0;
if (changed0) {
t0xp = signx0;
break;
} else {
goto LBL_NEXT3;
}
}
if (changed0)
break;
else
t0x += signx0;
if (i < dx0)
i++;
}
LBL_NEXT3:
while (t1x != v2.x) {
e1 += dy1;
while (e1 >= dx1) {
e1 -= dx1;
if (changed1)
t1xp = signx1;
else
goto LBL_NEXT4;
}
if (changed1)
break;
else
t1x += signx1;
}
LBL_NEXT4:
if (minx > t0x)
minx = t0x;
if (minx > t1x)
minx = t1x;
if (maxx < t0x)
maxx = t0x;
if (maxx < t1x)
maxx = t1x;
if (v1.y != v2.y) {
const uint8_t vu0 = ((y - v0.y) * v2.u + (v2.y - y) * v0.u) / (v2.y - v0.y);
const uint8_t vv0 = ((y - v0.y) * v2.v + (v2.y - y) * v0.v) / (v2.y - v0.y);
const uint8_t vu1 = ((y - v1.y) * v2.u + (v2.y - y) * v1.u) / (v2.y - v1.y);
const uint8_t vv1 = ((y - v1.y) * v2.v + (v2.y - y) * v1.v) / (v2.y - v1.y);
const float vz0 = ((y - v0.y) * v2.z + (v2.y - y) * v0.z) / (v2.y - v0.y);
const float vz1 = ((y - v1.y) * v2.z + (v2.y - y) * v1.z) / (v2.y - v1.y);
if (t1x < t0x)
itgl_horiz_line(tgl, minx, vz0, vu0, vv0, maxx, vz1, vu1, vv1, y, t, data);
else
itgl_horiz_line(tgl, minx, vz1, vu1, vv1, maxx, vz0, vu0, vv0, y, t, data);
} else {
itgl_horiz_line(tgl, minx, v1.z, v1.u, v1.v, maxx, v2.z, v2.u, v2.v, y, t, data);
}
if (!changed0)
t0x += signx0;
t0x += t0xp;
if (!changed1)
t1x += signx1;
t1x += t1xp;
y += 1;
if (y > v2.y)
return;
};
}
int tgl_enable(TGL *const tgl, const uint8_t settings)
{
const uint8_t enable = settings & ~tgl->settings;
tgl->settings |= settings;
if (enable & TGL_Z_BUFFER) {
tgl->z_buffer_enabled = true;
tgl->z_buffer = TGL_MALLOC(sizeof(float) * tgl->frame_size);
if (!tgl->z_buffer)
return -1;
tgl_clear(tgl, TGL_Z_BUFFER);
}
if (enable & TGL_OUTPUT_BUFFER) {
/* Longest non-rgb SGR code: \033[22;24;XX;10Xm (length 15)
* Longest rgb SGR code: \033[22;24;38;2;XXX;XXX;XXX;48;2;XXX;XXX;XXXm (length 42)
* Maximum 44 chars per pixel: SGR + 2 x char
* 1 Newline character per line
* DECDWL code: \033#6 (length 3) per line
* {SGR clear code: \033[0m } OR {SGR set cursor position code: \033[;H } (length 4) at start
* 1 NUL terminator
*/
tgl->output_buffer_size = 44u * tgl->frame_size + tgl->height * 4u + 4u + 1u;
tgl->output_buffer = TGL_MALLOC(tgl->output_buffer_size);
if (!tgl->output_buffer)
return -1;
tgl_clear(tgl, TGL_OUTPUT_BUFFER);
}
return 0;
}
void tgl_disable(TGL *const tgl, const uint8_t settings)
{
tgl->settings &= ~settings;
if (settings & TGL_Z_BUFFER) {
tgl->z_buffer_enabled = false;
TGL_FREE(tgl->z_buffer);
tgl->z_buffer = NULL;
}
if (settings & TGL_OUTPUT_BUFFER) {
tgl->output_buffer_size = 0;
TGL_FREE(tgl->output_buffer);
tgl->output_buffer = NULL;
}
}
void tgl_delete(TGL *const tgl)
{
TGL_FREE(tgl->frame_buffer);
TGL_FREE(tgl->z_buffer);
TGL_FREE(tgl->output_buffer);
TGL_FREE(tgl);
}
#ifdef TERMGL3D
#include <math.h>
#define TGL_CULL_FACE_BIT 0x01
#define TGL_WINDING_BIT 0x02
#define MAP_COORD(half_, val_) ((val_ * half_) + half_)
#define TGL_ROTATION_MATRIX(x_, y_, z_) \
{ \
{ cosf(z_) * cosf(y_), -sinf(z_) * cosf(x_) + cosf(z_) * sinf(y_) * sinf(x_), sinf(z_) * sinf(x_) + cosf(z_) * sinf(y_) * cosf(x_), 0.f }, \
{ sinf(z_) * cosf(y_), cosf(z_) * cosf(x_) + sinf(z_) * sinf(y_) * sinf(x_), -cosf(z_) * sinf(x_) + sinf(z_) * sinf(y_) * cosf(x_), 0.f }, \
{ -sinf(y_), cosf(y_) * sinf(x_), cosf(y_) * cosf(x_), 0.f }, \
{ 0.f, 0.f, 0.f, 1.f }, \
}
#define TGL_SCALE_MATRIX(x_, y_, z_) \
{ \
{ x_, 0.f, 0.f, 0.f }, \
{ 0.f, y_, 0.f, 0.f }, \
{ 0.f, 0.f, z_, 0.f }, \
{ 0.f, 0.f, 0.f, 1.f }, \
}
#define TGL_TRANSLATE_MATRIX(x_, y_, z_) \
{ \
{ 1.f, 0.f, 0.f, x_ }, \
{ 0.f, 1.f, 0.f, y_ }, \
{ 0.f, 0.f, 1.f, z_ }, \
{ 0.f, 0.f, 0.f, 1.f }, \
}
#define TGL_CAMERA_MATRIX(width, height, fov, near_val, far_val) \
{ \
{ height / (float)width / tanf(fov * .5f), 0.f, 0.f, 0.f }, \
{ 0.f, 1.f / tanf(fov * .5f), 0.f, 0.f }, \
{ 0.f, 0.f, -(far_val + near_val) / (far_val - near_val), 2.f * far_val * near_val / (far_val - near_val) }, \
{ 0.f, 0.f, 1.f, 0.f }, \
}
enum ClipPlane {
CLIP_NEAR = 0,
CLIP_FAR,
CLIP_LEFT,
CLIP_RIGHT,
CLIP_TOP,
CLIP_BOTTOM,
};
typedef struct TGLUVTriangle {
TGLVec4 verts[3];
uint8_t uv[3][2];
} TGLUVTriangle;
static void itgl_clip_line(const float dot_i, const TGLVec4 vec_i, const uint8_t uv_i[2], const float dot_o, const TGLVec4 vec_o, const uint8_t uv_o[2], TGLVec4 vec_out, uint8_t uv_out[2]);
static unsigned itgl_clip_triangle_plane(const enum ClipPlane plane, const TGLUVTriangle *in, TGLUVTriangle *out);
static float itgl_clip_plane_dot(const TGLVec4 v, const enum ClipPlane plane);
#ifndef TERMGL_MINIMAL
__attribute__((const)) float tgl_sqr(const float val)
{
return val * val;
}
__attribute__((const)) float tgl_mag3(const float vec[3])
{
return sqrtf(tgl_sqr(vec[0]) + tgl_sqr(vec[1]) + tgl_sqr(vec[2]));
}
__attribute__((const)) float tgl_magsqr3(const float vec[3])
{
return tgl_sqr(vec[0]) + tgl_sqr(vec[1]) + tgl_sqr(vec[2]);
}
__attribute__((const)) float tgl_dot3(const float vec1[3], const float vec2[3])
{
return vec1[0] * vec2[0] + vec1[1] * vec2[1] + vec1[2] * vec2[2];
}
__attribute__((const)) float tgl_dot4(const float vec1[4], const float vec2[4])
{
return vec1[0] * vec2[0] + vec1[1] * vec2[1] + vec1[2] * vec2[2] + vec1[3] * vec2[3];
}
__attribute__((const)) float tgl_dot43(const float vec1[4], const float vec2[3])
{
return vec1[0] * vec2[0] + vec1[1] * vec2[1] + vec1[2] * vec2[2] + vec1[3];
}
void tgl_add3s(const float vec1[3], const float summand, float res[3])
{
res[0] = vec1[0] + summand;
res[1] = vec1[1] + summand;
res[2] = vec1[2] + summand;
}
void tgl_sub3s(const float vec1[3], const float subtrahend, float res[3])
{
res[0] = vec1[0] - subtrahend;
res[1] = vec1[1] - subtrahend;
res[2] = vec1[2] - subtrahend;
}
void tgl_add3v(const float vec1[3], const float vec2[3], float res[3])
{
res[0] = vec1[0] + vec2[0];
res[1] = vec1[1] + vec2[1];
res[2] = vec1[2] + vec2[2];
}
void tgl_mul3v(const float vec1[3], const float vec2[3], float res[3])
{
res[0] = vec1[0] * vec2[0];
res[1] = vec1[1] * vec2[1];
res[2] = vec1[2] * vec2[2];
}
void tgl_inv3(const float vec[3], float res[3])
{
res[0] = 1.f / vec[0];
res[1] = 1.f / vec[1];
res[2] = 1.f / vec[2];
}
void tgl_norm3(float vec[3])
{
tgl_mul3s(vec, 1.f / tgl_mag3(vec), vec);
}
void tgl_mulmatvec(const TGLMat mat, const TGLVec3 vec, TGLVec4 res)
{
res[0] = tgl_dot43(mat[0], vec);
res[1] = tgl_dot43(mat[1], vec);
res[2] = tgl_dot43(mat[2], vec);
res[3] = tgl_dot43(mat[3], vec);
}
void tgl_mulmat(const TGLMat mat1, const TGLMat mat2, TGLMat res)
{
unsigned c, d, k;
for (c = 0; c < 4u; c++)
for (d = 0; d < 4u; d++) {
res[c][d] = 0.f;
for (k = 0; k < 4u; k++)
res[c][d] += mat1[c][k] * mat2[k][d];
}
}
void tgl3d_vertex_shader_simple(const TGLVec3 vert, TGLVec4 out, const void *const data)
{
const TGLVertexShaderSimple *simple = data;
tgl_mulmatvec(simple->mat, vert, out);
}
void tgl_camera(TGLMat camera, const int width, const int height, const float fov, const float near_val, const float far_val)
{
TGLMat projection = TGL_CAMERA_MATRIX(width, height, fov, near_val, far_val);
memcpy(camera, projection, sizeof(TGLMat));
}
void tgl_rotate(TGLMat rotate, const float x, const float y, const float z)
{
const TGLMat mat = TGL_ROTATION_MATRIX(x, y, z);
memcpy(rotate, mat, sizeof(TGLMat));
}
void tgl_scale(TGLMat scale, const float x, const float y, const float z)
{
const TGLMat mat = TGL_SCALE_MATRIX(x, y, z);
memcpy(scale, mat, sizeof(TGLMat));
}
void tgl_translate(TGLMat translate, const float x, const float y, const float z)
{
const TGLMat mat = TGL_TRANSLATE_MATRIX(x, y, z);
memcpy(translate, mat, sizeof(TGLMat));
}
#endif /* ~TERMGL_MINIMAL */
void tgl_mul3s(const float vec[3], const float mul, float res[3])
{
res[0] = vec[0] * mul;
res[1] = vec[1] * mul;
res[2] = vec[2] * mul;
}
void tgl_sub3v(const float vec1[3], const float vec2[3], float res[3])
{
res[0] = vec1[0] - vec2[0];
res[1] = vec1[1] - vec2[1];
res[2] = vec1[2] - vec2[2];
}
void tgl_cross(const float vec1[3], const float vec2[3], float res[3])
{
res[0] = vec1[1] * vec2[2] - vec1[2] * vec2[1];
res[1] = vec1[2] * vec2[0] - vec1[0] * vec2[2];
res[2] = vec1[0] * vec2[1] - vec1[1] * vec2[0];
}
void itgl_clip_line(const float dot_i, const TGLVec4 vec_i, const uint8_t uv_i[2], const float dot_o, const TGLVec4 vec_o, const uint8_t uv_o[2], TGLVec4 vec_out, uint8_t uv_out[2])
{
const float d = dot_i / (dot_i - dot_o);
vec_out[0] = MIX(vec_o[0], vec_i[0], d);
vec_out[1] = MIX(vec_o[1], vec_i[1], d);
vec_out[2] = MIX(vec_o[2], vec_i[2], d);
vec_out[3] = MIX(vec_o[3], vec_i[3], d);
uv_out[0] = MIX(uv_o[0], uv_i[0], d);
uv_out[1] = MIX(uv_o[1], uv_i[1], d);
}
float itgl_clip_plane_dot(const TGLVec4 v, const enum ClipPlane plane)
{
switch (plane) {
case CLIP_LEFT: