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opengl stb_truetype demo app

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This commit is contained in:
Sean Barrett 2021-07-12 21:27:12 -07:00
parent a0a939058c
commit 3a1174060a
1 changed files with 184 additions and 0 deletions
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tests/truetype_test_win32.c Normal file
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// tested in VC6 (1998) and VS 2019
#define _CRT_SECURE_NO_WARNINGS
#define WIN32_MEAN_AND_LEAN
#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#define STB_TRUETYPE_IMPLEMENTATION
#include "stb_truetype.h"
#include <gl/gl.h>
#include <gl/glu.h>
int screen_x=1024, screen_y=768;
GLuint tex;
unsigned char ttf_buffer[1<<20];
unsigned char temp_bitmap[1024*1024];
stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
void init(void)
{
fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
stbtt_BakeFontBitmap(ttf_buffer,0, 64.0, temp_bitmap,1024,1024, 32,96, cdata);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 1024,1024,0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}
void print(float x, float y, char *text)
{
// assume orthographic projection with units = screen pixels, origin at top left
glBindTexture(GL_TEXTURE_2D, tex);
glBegin(GL_QUADS);
while (*text) {
if (*text >= 32 && *text < 128) {
stbtt_aligned_quad q;
stbtt_GetBakedQuad(cdata, 1024,1024, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9
glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y0);
glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y0);
glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y1);
glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y1);
}
++text;
}
glEnd();
}
void draw(void)
{
glViewport(0,0,screen_x,screen_y);
glClearColor(0.45f,0.45f,0.75f,0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
glDisable(GL_BLEND);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,screen_x,screen_y,0,-1,1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor3f(1,1,1);
print(100,150, "This is a simple test!");
// show font bitmap
glBegin(GL_QUADS);
glTexCoord2f(0,0); glVertex2f(256,200+0);
glTexCoord2f(1,0); glVertex2f(768,200+0);
glTexCoord2f(1,1); glVertex2f(768,200+512);
glTexCoord2f(0,1); glVertex2f(256,200+512);
glEnd();
}
///////////////////////////////////////////////////////////////////////
///
///
/// Windows OpenGL setup
///
///
HINSTANCE app;
HWND window;
HGLRC rc;
HDC dc;
#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "glu32.lib")
#pragma comment(lib, "winmm.lib")
int mySetPixelFormat(HWND win)
{
PIXELFORMATDESCRIPTOR pfd = { sizeof(pfd), 1, PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER, PFD_TYPE_RGBA };
int pixel_format;
pfd.dwLayerMask = PFD_MAIN_PLANE;
pfd.cColorBits = 24;
pfd.cAlphaBits = 8;
pfd.cDepthBits = 24;
pfd.cStencilBits = 8;
pixel_format = ChoosePixelFormat(dc, &pfd);
if (!pixel_format) return FALSE;
if (!DescribePixelFormat(dc, pixel_format, sizeof(PIXELFORMATDESCRIPTOR), &pfd))
return FALSE;
SetPixelFormat(dc, pixel_format, &pfd);
return TRUE;
}
static int WINAPI WinProc(HWND wnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
switch (msg) {
case WM_CREATE: {
LPCREATESTRUCT lpcs = (LPCREATESTRUCT) lparam;
dc = GetDC(wnd);
if (mySetPixelFormat(wnd)) {
rc = wglCreateContext(dc);
if (rc) {
wglMakeCurrent(dc, rc);
return 0;
}
}
return -1;
}
case WM_DESTROY:
wglMakeCurrent(NULL, NULL);
if (rc) wglDeleteContext(rc);
PostQuitMessage (0);
return 0;
default:
return DefWindowProc (wnd, msg, wparam, lparam);
}
return DefWindowProc (wnd, msg, wparam, lparam);
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
DWORD dwstyle = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX;
WNDCLASSEX wndclass;
wndclass.cbSize = sizeof(wndclass);
wndclass.style = CS_OWNDC;
wndclass.lpfnWndProc = (WNDPROC) WinProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(hInstance, _T("appicon"));
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground = GetStockObject(NULL_BRUSH);
wndclass.lpszMenuName = _T("truetype-test");
wndclass.lpszClassName = _T("truetype-test");
wndclass.hIconSm = NULL;
app = hInstance;
if (!RegisterClassEx(&wndclass))
return 0;
window = CreateWindow(_T("truetype-test"), _T("truetype test"), dwstyle,
CW_USEDEFAULT,0, screen_x, screen_y,
NULL, NULL, app, NULL);
ShowWindow(window, SW_SHOWNORMAL);
init();
for(;;) {
MSG msg;
if (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
} else {
return 1; // WM_QUIT
}
wglMakeCurrent(dc, rc);
draw();
SwapBuffers(dc);
}
return 0;
}