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nothings-stb/tests/oversample/main.c

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#pragma warning(disable:4244; disable:4305; disable:4018)
#include <assert.h>
#include <ctype.h>
#define STB_WINMAIN
#include "stb_wingraph.h"
#define STB_TRUETYPE_IMPLEMENTATION
#define STB_RECT_PACK_IMPLEMENTATION
#include "stb_rect_pack.h"
#include "stb_truetype.h"
#ifndef WINGDIAPI
#define CALLBACK __stdcall
#define WINGDIAPI __declspec(dllimport)
#define APIENTRY __stdcall
#endif
#include <gl/gl.h>
#include <gl/glu.h>
#define GL_FRAMEBUFFER_SRGB_EXT 0x8DB9
#define SIZE_X 1024
#define SIZE_Y 768
stbtt_packedchar chardata[6][128];
int sx=SIZE_X, sy=SIZE_Y;
#define BITMAP_W 512
#define BITMAP_H 512
unsigned char temp_bitmap[BITMAP_W][BITMAP_H];
unsigned char ttf_buffer[1 << 25];
GLuint font_tex;
float scale[2] = { 24.0f, 14.0f };
int sf[6] = { 0,1,2, 0,1,2 };
void load_fonts(void)
{
stbtt_pack_context pc;
int i;
FILE *f;
char filename[256];
char *win = getenv("windir");
if (win == NULL) win = getenv("SystemRoot");
f = fopen(stb_wingraph_commandline, "rb");
if (!f) {
if (win == NULL)
sprintf(filename, "arial.ttf", win);
else
sprintf(filename, "%s/fonts/arial.ttf", win);
f = fopen(filename, "rb");
if (!f) exit(0);
}
fread(ttf_buffer, 1, 1<<25, f);
stbtt_PackBegin(&pc, temp_bitmap[0], BITMAP_W, BITMAP_H, 0, 1, NULL);
for (i=0; i < 2; ++i) {
stbtt_PackSetOversampling(&pc, 1, 1);
stbtt_PackFontRange(&pc, ttf_buffer, 0, scale[i], 32, 95, chardata[i*3+0]+32);
stbtt_PackSetOversampling(&pc, 2, 2);
stbtt_PackFontRange(&pc, ttf_buffer, 0, scale[i], 32, 95, chardata[i*3+1]+32);
stbtt_PackSetOversampling(&pc, 3, 1);
stbtt_PackFontRange(&pc, ttf_buffer, 0, scale[i], 32, 95, chardata[i*3+2]+32);
}
stbtt_PackEnd(&pc);
glGenTextures(1, &font_tex);
glBindTexture(GL_TEXTURE_2D, font_tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, BITMAP_W, BITMAP_H, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
int black_on_white;
void draw_init(void)
{
glDisable(GL_CULL_FACE);
glDisable(GL_TEXTURE_2D);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
glViewport(0,0,sx,sy);
if (black_on_white)
glClearColor(255,255,255,0);
else
glClearColor(0,0,0,0);
glClear(GL_COLOR_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0,sx,sy,0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void drawBoxTC(float x0, float y0, float x1, float y1, float s0, float t0, float s1, float t1)
{
glTexCoord2f(s0,t0); glVertex2f(x0,y0);
glTexCoord2f(s1,t0); glVertex2f(x1,y0);
glTexCoord2f(s1,t1); glVertex2f(x1,y1);
glTexCoord2f(s0,t1); glVertex2f(x0,y1);
}
int integer_align;
void print(float x, float y, int font, char *text)
{
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, font_tex);
glBegin(GL_QUADS);
while (*text) {
stbtt_aligned_quad q;
stbtt_GetPackedQuad(chardata[font], BITMAP_W, BITMAP_H, *text++, &x, &y, &q, font ? 0 : integer_align);
drawBoxTC(q.x0,q.y0,q.x1,q.y1, q.s0,q.t0,q.s1,q.t1);
}
glEnd();
}
int font=3;
int translating;
int rotating=0;
int srgb=0;
float rotate_t, translate_t;
int show_tex;
void draw_world(void)
{
int sfont = sf[font];
float x = 20;
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if (black_on_white)
glColor3f(0,0,0);
else
glColor3f(1,1,1);
print(80, 30, sfont, "Controls:");
print(100, 60, sfont, "S: toggle font size");
print(100, 85, sfont, "O: toggle oversampling");
print(100,110, sfont, "T: toggle translation");
print(100,135, sfont, "R: toggle rotation");
print(100,160, sfont, "P: toggle pixel-snap (only non-oversampled)");
print(100,185, sfont, "G: toggle srgb gamma-correction");
if (black_on_white)
print(100,210, sfont, "B: toggle to white-on-black");
else
print(100,210, sfont, "B: toggle to black-on-white");
print(100,235, sfont, "V: view font texture");
print(80, 300, sfont, "Current font:");
if (!show_tex) {
if (font < 3)
print(100, 350, sfont, "Font height: 24 pixels");
else
print(100, 350, sfont, "Font height: 14 pixels");
}
if (font%3==1)
print(100, 325, sfont, "2x2 oversampled text at 1:1");
else if (font%3 == 2)
print(100, 325, sfont, "3x1 oversampled text at 1:1");
else if (integer_align)
print(100, 325, sfont, "1:1 text, one texel = one pixel, snapped to integer coordinates");
else
print(100, 325, sfont, "1:1 text, one texel = one pixel");
if (show_tex) {
glBegin(GL_QUADS);
drawBoxTC(200,400, 200+BITMAP_W,300+BITMAP_H, 0,0,1,1);
glEnd();
} else {
glMatrixMode(GL_MODELVIEW);
glTranslatef(200,350,0);
if (translating)
x += fmod(translate_t*8,30);
if (rotating) {
glTranslatef(100,150,0);
glRotatef(rotate_t*2,0,0,1);
glTranslatef(-100,-150,0);
}
print(x,100, font, "This is a test");
print(x,130, font, "Now is the time for all good men to come to the aid of their country.");
print(x,160, font, "The quick brown fox jumps over the lazy dog.");
print(x,190, font, "0123456789");
}
}
void draw(void)
{
draw_init();
draw_world();
stbwingraph_SwapBuffers(NULL);
}
static int initialized=0;
static float last_dt;
int move[4];
int raw_mouse_x, raw_mouse_y;
int loopmode(float dt, int real, int in_client)
{
float actual_dt = dt;
if (!initialized) return 0;
rotate_t += dt;
translate_t += dt;
// music_sim();
if (!real)
return 0;
if (dt > 0.25) dt = 0.25;
if (dt < 0.01) dt = 0.01;
draw();
return 0;
}
int winproc(void *data, stbwingraph_event *e)
{
switch (e->type) {
case STBWGE_create:
break;
case STBWGE_char:
switch(e->key) {
case 27:
stbwingraph_ShowCursor(NULL,1);
return STBWINGRAPH_winproc_exit;
break;
case 'o': case 'O':
font = (font+1) % 3 + (font/3)*3;
break;
case 's': case 'S':
font = (font+3) % 6;
break;
case 't': case 'T':
translating = !translating;
translate_t = 0;
break;
case 'r': case 'R':
rotating = !rotating;
rotate_t = 0;
break;
case 'p': case 'P':
integer_align = !integer_align;
break;
case 'g': case 'G':
srgb = !srgb;
if (srgb)
glEnable(GL_FRAMEBUFFER_SRGB_EXT);
else
glDisable(GL_FRAMEBUFFER_SRGB_EXT);
break;
case 'v': case 'V':
show_tex = !show_tex;
break;
case 'b': case 'B':
black_on_white = !black_on_white;
break;
}
break;
case STBWGE_mousemove:
raw_mouse_x = e->mx;
raw_mouse_y = e->my;
break;
#if 0
case STBWGE_mousewheel: do_mouse(e,0,0); break;
case STBWGE_leftdown: do_mouse(e, 1,0); break;
case STBWGE_leftup: do_mouse(e,-1,0); break;
case STBWGE_rightdown: do_mouse(e,0, 1); break;
case STBWGE_rightup: do_mouse(e,0,-1); break;
#endif
case STBWGE_keydown:
if (e->key == VK_RIGHT) move[0] = 1;
if (e->key == VK_LEFT) move[1] = 1;
if (e->key == VK_UP) move[2] = 1;
if (e->key == VK_DOWN) move[3] = 1;
break;
case STBWGE_keyup:
if (e->key == VK_RIGHT) move[0] = 0;
if (e->key == VK_LEFT) move[1] = 0;
if (e->key == VK_UP) move[2] = 0;
if (e->key == VK_DOWN) move[3] = 0;
break;
case STBWGE_size:
sx = e->width;
sy = e->height;
loopmode(0,1,0);
break;
case STBWGE_draw:
if (initialized)
loopmode(0,1,0);
break;
default:
return STBWINGRAPH_unprocessed;
}
return 0;
}
void stbwingraph_main(void)
{
stbwingraph_Priority(2);
stbwingraph_CreateWindow(1, winproc, NULL, "tt", SIZE_X,SIZE_Y, 0, 1, 0, 0);
stbwingraph_ShowCursor(NULL, 0);
load_fonts();
initialized = 1;
stbwingraph_MainLoop(loopmode, 0.016f); // 30 fps = 0.33
}
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