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// ==============================================================
// This file is part of Glest Shared Library (www.glest.org)
//
// Copyright (C) 2001-2008 Martio Figueroa
//
// You can redistribute this code and/or modify it under
// the terms of the GNU General Public License as published
// by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version
// ==============================================================
#include "gl_wrap.h"
#include <cassert>
#include <windows.h>
#include "opengl.h"
#include "leak_dumper.h"
using namespace Shared::Graphics::Gl;
namespace Shared{ namespace Platform{
// =====================================================
// class PlatformContextGl
// =====================================================
void PlatformContextGl::init(int colorBits, int depthBits, int stencilBits){
int iFormat;
PIXELFORMATDESCRIPTOR pfd;
BOOL err;
//Set8087CW($133F);
dch = GetDC(GetActiveWindow());
assert(dch!=NULL);
ZeroMemory(&pfd, sizeof(pfd));
pfd.nSize= sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion= 1;
pfd.dwFlags= PFD_GENERIC_ACCELERATED | PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType= PFD_TYPE_RGBA;
pfd.cColorBits= colorBits;
pfd.cDepthBits= depthBits;
pfd.iLayerType= PFD_MAIN_PLANE;
pfd.cStencilBits= stencilBits;
iFormat= ChoosePixelFormat(dch, &pfd);
assert(iFormat!=0);
err= SetPixelFormat(dch, iFormat, &pfd);
assert(err);
glch= wglCreateContext(dch);
if(glch==NULL){
throw runtime_error("Error initing OpenGL device context");
}
makeCurrent();
}
void PlatformContextGl::end(){
int makeCurrentError= wglDeleteContext(glch);
assert(makeCurrentError);
}
void PlatformContextGl::makeCurrent(){
int makeCurrentError= wglMakeCurrent(dch, glch);
assert(makeCurrentError);
}
void PlatformContextGl::swapBuffers(){
int swapErr= SwapBuffers(dch);
assert(swapErr);
}
// ======================================
// Global Fcs
// ======================================
void createGlFontBitmaps(uint32 &base, const string &type, int size, int width, int charCount, FontMetrics &metrics){
HFONT font= CreateFont(
size, 0, 0, 0, width, 0, FALSE, FALSE, ANSI_CHARSET,
OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY,
DEFAULT_PITCH, type.c_str());
assert(font!=NULL);
HDC dc= wglGetCurrentDC();
SelectObject(dc, font);
BOOL err= wglUseFontBitmaps(dc, 0, charCount, base);
FIXED one;
one.value= 1;
one.fract= 0;
FIXED zero;
zero.value= 0;
zero.fract= 0;
MAT2 mat2;
mat2.eM11= one;
mat2.eM12= zero;
mat2.eM21= zero;
mat2.eM22= one;
//metrics
GLYPHMETRICS glyphMetrics;
int errorCode= GetGlyphOutline(dc, 'a', GGO_METRICS, &glyphMetrics, 0, NULL, &mat2);
if(errorCode!=GDI_ERROR){
metrics.setHeight(static_cast<float>(glyphMetrics.gmBlackBoxY));
}
for(int i=0; i<charCount; ++i){
int errorCode= GetGlyphOutline(dc, i, GGO_METRICS, &glyphMetrics, 0, NULL, &mat2);
if(errorCode!=GDI_ERROR){
metrics.setWidth(i, static_cast<float>(glyphMetrics.gmCellIncX));
}
}
DeleteObject(font);
assert(err);
}
void createGlFontOutlines(uint32 &base, const string &type, int width, float depth, int charCount, FontMetrics &metrics){
HFONT font= CreateFont(
10, 0, 0, 0, width, 0, FALSE, FALSE, ANSI_CHARSET,
OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY,
DEFAULT_PITCH, type.c_str());
assert(font!=NULL);
GLYPHMETRICSFLOAT *glyphMetrics= new GLYPHMETRICSFLOAT[charCount];
HDC dc= wglGetCurrentDC();
SelectObject(dc, font);
BOOL err= wglUseFontOutlines(dc, 0, charCount, base, 1000, depth, WGL_FONT_POLYGONS, glyphMetrics);
//load metrics
metrics.setHeight(glyphMetrics['a'].gmfBlackBoxY);
for(int i=0; i<charCount; ++i){
metrics.setWidth(i, glyphMetrics[i].gmfCellIncX);
}
DeleteObject(font);
delete [] glyphMetrics;
assert(err);
}
const char *getPlatformExtensions(const PlatformContextGl *pcgl){
typedef const char* (WINAPI * PROCTYPE) (HDC hdc);
PROCTYPE proc= reinterpret_cast<PROCTYPE>(getGlProcAddress("wglGetExtensionsStringARB"));
return proc==NULL? "": proc(pcgl->getHandle());
}
PROC getGlProcAddress(const char *procName){
PROC proc= wglGetProcAddress(procName);
assert(proc!=NULL);
return proc;
}
}}//end namespace
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