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