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Serious-Engine/Sources/Engine/Graphics/Gfx_OpenGL.cpp

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Uploading full engine sources
2016-03-11 14:57:17 +01:00
/* Copyright (c) 2002-2012 Croteam Ltd. All rights reserved. */
#include "stdh.h"
#include <Engine/Graphics/GfxLibrary.h>
#include <Engine/Base/Translation.h>
#include <Engine/Base/ErrorReporting.h>
#include <Engine/Base/Memory.h>
#include <Engine/Base/Console.h>
#include <Engine/Graphics/ViewPort.h>
#include <Engine/Graphics/MultiMonitor.h>
#include <Engine/Templates/DynamicContainer.cpp>
#include <Engine/Templates/Stock_CTextureData.h>
#include <Engine/Base/ListIterator.inl>
extern INDEX ogl_iTBufferEffect;
extern INDEX ogl_iTBufferSamples;
// fog/haze textures
extern ULONG _fog_ulTexture;
extern ULONG _haze_ulTexture;
// change control
extern INDEX GFX_ctVertices;
// attributes for t-buffer
int aiAttribList[] = {
WGL_DRAW_TO_WINDOW_EXT, TRUE,
WGL_SUPPORT_OPENGL_EXT, TRUE,
WGL_DOUBLE_BUFFER_EXT, TRUE,
WGL_PIXEL_TYPE_EXT, WGL_TYPE_RGBA_EXT,
WGL_COLOR_BITS_EXT, 16,
WGL_DEPTH_BITS_EXT, 16,
WGL_SAMPLE_BUFFERS_3DFX, 1,
WGL_SAMPLES_3DFX, 4,
0, 0
};
int *piAttribList = aiAttribList;
// engine's internal opengl state variables
extern BOOL GFX_bDepthTest;
extern BOOL GFX_bDepthWrite;
extern BOOL GFX_bAlphaTest;
extern BOOL GFX_bBlending;
extern BOOL GFX_bDithering;
extern BOOL GFX_bClipping;
extern BOOL GFX_bClipPlane;
extern BOOL GFX_bColorArray;
extern BOOL GFX_bFrontFace;
extern BOOL GFX_bTruform;
extern INDEX GFX_iActiveTexUnit;
extern FLOAT GFX_fMinDepthRange;
extern FLOAT GFX_fMaxDepthRange;
extern GfxBlend GFX_eBlendSrc;
extern GfxBlend GFX_eBlendDst;
extern GfxComp GFX_eDepthFunc;
extern GfxFace GFX_eCullFace;
extern INDEX GFX_iTexModulation[GFX_MAXTEXUNITS];
extern BOOL glbUsingVARs = FALSE; // vertex_array_range
// define gl function pointers
#define DLLFUNCTION(dll, output, name, inputs, params, required) \
output (__stdcall *p##name) inputs = NULL;
#include "gl_functions.h"
#undef DLLFUNCTION
// extensions
void (__stdcall *pglLockArraysEXT)(GLint first, GLsizei count) = NULL;
void (__stdcall *pglUnlockArraysEXT)(void) = NULL;
GLboolean (__stdcall *pwglSwapIntervalEXT)(GLint interval) = NULL;
GLint (__stdcall *pwglGetSwapIntervalEXT)(void) = NULL;
void (__stdcall *pglActiveTextureARB)(GLenum texunit) = NULL;
void (__stdcall *pglClientActiveTextureARB)(GLenum texunit) = NULL;
// t-buffer support
char *(__stdcall *pwglGetExtensionsStringARB)(HDC hdc);
BOOL (__stdcall *pwglChoosePixelFormatARB)(HDC hdc, const int *piAttribIList, const FLOAT *pfAttribFList, UINT nMaxFormats, int *piFormats, UINT *nNumFormats);
BOOL (__stdcall *pwglGetPixelFormatAttribivARB)(HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, int *piAttributes, int *piValues);
void (__stdcall *pglTBufferMask3DFX)(GLuint mask);
// NV occlusion query
void (__stdcall *pglGenOcclusionQueriesNV)( GLsizei n, GLuint *ids);
void (__stdcall *pglDeleteOcclusionQueriesNV)( GLsizei n, const GLuint *ids);
void (__stdcall *pglBeginOcclusionQueryNV)( GLuint id);
void (__stdcall *pglEndOcclusionQueryNV)(void);
void (__stdcall *pglGetOcclusionQueryivNV)( GLuint id, GLenum pname, GLint *params);
void (__stdcall *pglGetOcclusionQueryuivNV)( GLuint id, GLenum pname, GLuint *params);
GLboolean (__stdcall *pglIsOcclusionQueryNV)( GLuint id);
// ATI GL_ATI_pn_triangles
void (__stdcall *pglPNTrianglesiATI)( GLenum pname, GLint param);
void (__stdcall *pglPNTrianglesfATI)( GLenum pname, GLfloat param);
void WIN_CheckError(BOOL bRes, const char *strDescription)
{
if( bRes) return;
DWORD dwWindowsErrorCode = GetLastError();
if( dwWindowsErrorCode==ERROR_SUCCESS) return; // ignore stupid 'successful' error
WarningMessage("%s: %s", strDescription, GetWindowsError(dwWindowsErrorCode));
}
static void FailFunction_t(const char *strName) {
ThrowF_t(TRANS("Required function %s not found."), strName);
}
static void OGL_SetFunctionPointers_t(HINSTANCE hiOGL)
{
const char *strName;
// get gl function pointers
#define DLLFUNCTION(dll, output, name, inputs, params, required) \
strName = #name; \
p##name = (output (__stdcall*) inputs) GetProcAddress( hi##dll, strName); \
if( required && p##name == NULL) FailFunction_t(strName);
#include "gl_functions.h"
#undef DLLFUNCTION
}
static void OGL_ClearFunctionPointers(void)
{
// clear gl function pointers
#define DLLFUNCTION(dll, output, name, inputs, params, required) p##name = NULL;
#include "gl_functions.h"
#undef DLLFUNCTION
}
#define BACKOFF pwglMakeCurrent( NULL, NULL); \
pwglDeleteContext( hglrc); \
ReleaseDC( dummyhwnd, hdc); \
DestroyWindow( dummyhwnd); \
UnregisterClassA( classname, hInstance);
// helper for choosing t-buffer's pixel format
static BOOL _TBCapability = FALSE;
static INDEX ChoosePixelFormatTB( HDC hdc, const PIXELFORMATDESCRIPTOR *ppfd,
PIX pixResWidth, PIX pixResHeight)
{
_TBCapability = FALSE;
char *extensions = NULL;
char *wglextensions = NULL;
HGLRC hglrc;
HWND dummyhwnd;
WNDCLASSA cls;
HINSTANCE hInstance = GetModuleHandle(NULL);
LPCSTR classname = "dummyOGLwin";
cls.style = CS_OWNDC;
cls.lpfnWndProc = DefWindowProc;
cls.cbClsExtra = 0;
cls.cbWndExtra = 0;
cls.hInstance = hInstance;
cls.hIcon = LoadIcon(NULL, IDI_APPLICATION);
cls.hCursor = LoadCursor(NULL, IDC_WAIT);
cls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
cls.lpszMenuName = NULL;
cls.lpszClassName = classname;
// didn't manage to register class?
if( !RegisterClassA(&cls)) return 0;
// create window fullscreen
//CPrintF( " Dummy window: %d x %d\n", pixResWidth, pixResHeight);
dummyhwnd = CreateWindowExA( WS_EX_TOPMOST, classname, "Dummy OGL window",
WS_POPUP|WS_VISIBLE, 0, 0, pixResWidth, pixResHeight,
NULL, NULL, hInstance, NULL);
// didn't make it?
if( dummyhwnd == NULL) {
UnregisterClassA( classname, hInstance);
return 0;
}
//CPrintF( " Dummy passed...\n");
hdc = GetDC(dummyhwnd);
// try to choose pixel format
int iPixelFormat = pwglChoosePixelFormat( hdc, ppfd);
if( !iPixelFormat) {
ReleaseDC( dummyhwnd, hdc);
DestroyWindow(dummyhwnd);
UnregisterClassA( classname, hInstance);
return 0;
}
//CPrintF( " Choose pixel format passed...\n");
// try to set pixel format
if( !pwglSetPixelFormat( hdc, iPixelFormat, ppfd)) {
ReleaseDC( dummyhwnd, hdc);
DestroyWindow(dummyhwnd);
UnregisterClassA( classname, hInstance);
return 0;
}
//CPrintF( " Set pixel format passed...\n");
// create context using the default accelerated pixelformat that was passed
hglrc = pwglCreateContext(hdc);
pwglMakeCurrent( hdc, hglrc);
// update the value list with information passed from the ppfd.
aiAttribList[ 9] = ppfd->cColorBits;
aiAttribList[11] = ppfd->cDepthBits;
aiAttribList[15] = _pGfx->go_ctSampleBuffers;
// get the extension list.
extensions = (char*)pglGetString(GL_EXTENSIONS);
// get the wgl extension list.
if( strstr((const char*)extensions, "WGL_EXT_extensions_string ") != NULL)
{ // windows extension string supported
pwglGetExtensionsStringARB = (char* (__stdcall*)(HDC))pwglGetProcAddress( "wglGetExtensionsStringARB");
if( pwglGetExtensionsStringARB == NULL) {
BACKOFF
return 0;
}
//CPrintF( " WGL extension string passed...\n");
// get WGL extension string
wglextensions = (char*)pwglGetExtensionsStringARB(hdc);
}
else {
BACKOFF
return 0;
}
// check for the pixel format and multisample extension strings
if( (strstr((const char*)wglextensions, "WGL_ARB_pixel_format ") != NULL) &&
(strstr((const char*)extensions, "GL_3DFX_multisample ") != NULL)) {
// 3dfx extensions present
_TBCapability = TRUE;
pwglChoosePixelFormatARB = (BOOL (__stdcall*)(HDC,const int*,const FLOAT*,UINT,int*,UINT*))pwglGetProcAddress( "wglChoosePixelFormatARB");
pwglGetPixelFormatAttribivARB = (BOOL (__stdcall*)(HDC,int,int,UINT,int*,int*) )pwglGetProcAddress( "wglGetPixelFormatAttribivARB");
pglTBufferMask3DFX = (void (__stdcall*)(GLuint))pwglGetProcAddress("glTBufferMask3DFX");
if( pwglChoosePixelFormatARB==NULL && pglTBufferMask3DFX==NULL) {
BACKOFF
return 0;
}
//CPrintF( " WGL choose pixel format present...\n");
int iAttribListNum = {WGL_NUMBER_PIXEL_FORMATS_EXT};
int iMaxFormats = 1; // default number to return
if( pwglGetPixelFormatAttribivARB!=NULL) {
// get total number of formats supported.
pwglGetPixelFormatAttribivARB( hdc, NULL, NULL, 1, &iAttribListNum, &iMaxFormats);
//CPrintF( "Max formats: %d\n", iMaxFormats);
}
UINT uiNumFormats;
int *piFormats = (int*)AllocMemory( sizeof(UINT) *iMaxFormats);
// try to get all formats that fit the pixel format criteria
if( !pwglChoosePixelFormatARB( hdc, piAttribList, NULL, iMaxFormats, piFormats, &uiNumFormats)) {
FreeMemory(piFormats);
BACKOFF
return 0;
}
//CPrintF( " WGL choose pixel format passed...\n");
// return the first match for now
iPixelFormat = 0;
if( uiNumFormats>0) {
iPixelFormat = piFormats[0];
//CPrintF( "Num formats: %d\n", uiNumFormats);
//CPrintF( "First format: %d\n", iPixelFormat);
}
FreeMemory(piFormats);
}
else
{ // wglChoosePixelFormatARB extension does not exist :(
iPixelFormat = 0;
}
BACKOFF
return iPixelFormat;
}
// prepares pixel format for OpenGL context
BOOL CGfxLibrary::SetupPixelFormat_OGL( HDC hdc, BOOL bReport/*=FALSE*/)
{
int iPixelFormat = 0;
const PIX pixResWidth = gl_dmCurrentDisplayMode.dm_pixSizeI;
const PIX pixResHeight = gl_dmCurrentDisplayMode.dm_pixSizeJ;
const DisplayDepth dd = gl_dmCurrentDisplayMode.dm_ddDepth;
PIXELFORMATDESCRIPTOR pfd;
memset( &pfd, 0, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
// clamp depth/stencil values
extern INDEX gap_iDepthBits;
extern INDEX gap_iStencilBits;
if( gap_iDepthBits <12) gap_iDepthBits = 0;
else if( gap_iDepthBits <22) gap_iDepthBits = 16;
else if( gap_iDepthBits <28) gap_iDepthBits = 24;
else gap_iDepthBits = 32;
if( gap_iStencilBits<3) gap_iStencilBits = 0;
else if( gap_iStencilBits<7) gap_iStencilBits = 4;
else gap_iStencilBits = 8;
// set color/depth buffer values
pfd.cColorBits = (dd!=DD_16BIT) ? 32 : 16;
pfd.cDepthBits = gap_iDepthBits;
pfd.cStencilBits = gap_iStencilBits;
// must be required and works only in full screen via GDI functions
ogl_iTBufferEffect = Clamp( ogl_iTBufferEffect, 0L, 2L);
if( ogl_iTBufferEffect>0 && pixResWidth>0 && pixResHeight>0)
{ // lets T-buffer ... :)
//CPrintF( "TBuffer init...\n");
ogl_iTBufferSamples = (1L) << FastLog2(ogl_iTBufferSamples);
if( ogl_iTBufferSamples<2) ogl_iTBufferSamples = 4;
go_ctSampleBuffers = ogl_iTBufferSamples;
go_iCurrentWriteBuffer = 0;
iPixelFormat = ChoosePixelFormatTB( hdc, &pfd, pixResWidth, pixResHeight);
// need to reset the desktop resolution because CPFTB() resets it
BOOL bSuccess = CDS_SetMode( pixResWidth, pixResHeight, dd);
if( !bSuccess) iPixelFormat = 0;
// check T-buffer support
if( _TBCapability) pglGetIntegerv( GL_SAMPLES_3DFX, (GLint*)&go_ctSampleBuffers);
if( !iPixelFormat) { ogl_iTBufferEffect=0; CPrintF( TRANS("TBuffer initialization failed.\n")); }
else CPrintF( TRANS("TBuffer initialization passed (%d buffers in use).\n"), go_ctSampleBuffers);
}
// if T-buffer didn't make it, let's try thru regular path
if( !iPixelFormat) {
go_ctSampleBuffers = 0;
go_iCurrentWriteBuffer = 0;
iPixelFormat = pwglChoosePixelFormat( hdc, &pfd);
}
if( !iPixelFormat) {
WIN_CHECKERROR( 0, "ChoosePixelFormat");
return FALSE;
}
if( !pwglSetPixelFormat( hdc, iPixelFormat, &pfd)) {
WIN_CHECKERROR( 0, "SetPixelFormat");
return FALSE;
}
// test acceleration
memset( &pfd, 0, sizeof(pfd));
if( !pwglDescribePixelFormat( hdc, iPixelFormat, sizeof(pfd), &pfd)) return FALSE;
BOOL bGenericFormat = pfd.dwFlags & PFD_GENERIC_FORMAT;
BOOL bGenericAccelerated = pfd.dwFlags & PFD_GENERIC_ACCELERATED;
BOOL bHasAcceleration = (bGenericFormat && bGenericAccelerated) || // MCD
(!bGenericFormat && !bGenericAccelerated); // ICD
if( bHasAcceleration) gl_ulFlags |= GLF_HASACCELERATION;
else gl_ulFlags &= ~GLF_HASACCELERATION;
// done if report pixel format info isn't required
if( !bReport) return TRUE;
// prepare pixel type description
CTString strPixelType;
if( pfd.iPixelType==PFD_TYPE_RGBA) strPixelType = "TYPE_RGBA";
else if( pfd.iPixelType&PFD_TYPE_COLORINDEX) strPixelType = "TYPE_COLORINDEX";
else strPixelType = "unknown";
// prepare flags description
CTString strFlags = "";
if( pfd.dwFlags&PFD_DRAW_TO_WINDOW) strFlags += "DRAW_TO_WINDOW ";
if( pfd.dwFlags&PFD_DRAW_TO_BITMAP) strFlags += "DRAW_TO_BITMAP ";
if( pfd.dwFlags&PFD_SUPPORT_GDI) strFlags += "SUPPORT_GDI ";
if( pfd.dwFlags&PFD_SUPPORT_OPENGL) strFlags += "SUPPORT_OPENGL ";
if( pfd.dwFlags&PFD_GENERIC_ACCELERATED) strFlags += "GENERIC_ACCELERATED ";
if( pfd.dwFlags&PFD_GENERIC_FORMAT) strFlags += "GENERIC_FORMAT ";
if( pfd.dwFlags&PFD_NEED_PALETTE) strFlags += "NEED_PALETTE ";
if( pfd.dwFlags&PFD_NEED_SYSTEM_PALETTE) strFlags += "NEED_SYSTEM_PALETTE ";
if( pfd.dwFlags&PFD_DOUBLEBUFFER) strFlags += "DOUBLEBUFFER ";
if( pfd.dwFlags&PFD_STEREO) strFlags += "STEREO ";
if( pfd.dwFlags&PFD_SWAP_LAYER_BUFFERS) strFlags += "SWAP_LAYER_BUFFERS ";
if( pfd.dwFlags&PFD_DEPTH_DONTCARE) strFlags += "DEPTH_DONTCARE ";
if( pfd.dwFlags&PFD_DOUBLEBUFFER_DONTCARE) strFlags += "DOUBLEBUFFER_DONTCARE ";
if( pfd.dwFlags&PFD_STEREO_DONTCARE) strFlags += "STEREO_DONTCARE ";
if( pfd.dwFlags&PFD_SWAP_COPY) strFlags += "SWAP_COPY ";
if( pfd.dwFlags&PFD_SWAP_EXCHANGE) strFlags += "SWAP_EXCHANGE ";
if( strFlags=="") strFlags = "none";
// output pixel format description to console (for debugging purposes)
CPrintF( TRANS("\nPixel Format Description:\n"));
CPrintF( TRANS(" Number: %d (%s)\n"), iPixelFormat, strPixelType);
CPrintF( TRANS(" Flags: %s\n"), strFlags);
CPrintF( TRANS(" Color bits: %d (%d:%d:%d:%d)\n"), pfd.cColorBits,
pfd.cRedBits, pfd.cGreenBits, pfd.cBlueBits, pfd.cAlphaBits);
CPrintF( TRANS(" Depth bits: %d (%d for stencil)\n"), pfd.cDepthBits, pfd.cStencilBits);
gl_iCurrentDepth = pfd.cDepthBits; // keep depth bits
// all done
CPrintF( "\n");
return TRUE;
}
// test if an extension exists
static BOOL HasExtension( const char *strAllExtensions, const char *strExtension)
{
// find substring
const char *strFound = strstr( strAllExtensions, strExtension);
// no extension if not found
if( strFound==NULL) return FALSE;
INDEX iExtensionLen = strlen(strExtension);
// if found substring is substring of some other extension
if( strFound[iExtensionLen]!=' ' && strFound[iExtensionLen]!=0) {
// continue searching after that char
return HasExtension( strFound+iExtensionLen, strExtension);
}
// extension found
return TRUE;
}
// add OpenGL extensions to engine
void CGfxLibrary::AddExtension_OGL( ULONG ulFlag, const char *strName)
{
gl_ulFlags = (gl_ulFlags & ~ulFlag) | ulFlag;
go_strSupportedExtensions += strName;
go_strSupportedExtensions += " ";
}
// determine OpenGL extensions that engine supports
void CGfxLibrary::TestExtension_OGL( ULONG ulFlag, const char *strName)
{
if( HasExtension( go_strExtensions, strName)) AddExtension_OGL( ulFlag, strName);
}
// creates OpenGL drawing context
BOOL CGfxLibrary::CreateContext_OGL(HDC hdc)
{
if( !SetupPixelFormat_OGL( hdc, TRUE)) return FALSE;
go_hglRC = pwglCreateContext(hdc);
if( go_hglRC==NULL) {
WIN_CHECKERROR(0, "CreateContext");
return FALSE;
}
if( !pwglMakeCurrent(hdc, go_hglRC)) {
// NOTE: This error is sometimes reported without a reason on 3dfx hardware
// so we just have to ignore it.
//WIN_CHECKERROR(0, "MakeCurrent after CreateContext");
return FALSE;
}
return TRUE;
}
// prepares OpenGL drawing context
void CGfxLibrary::InitContext_OGL(void)
{
// must have context
ASSERT( gl_pvpActive!=NULL);
// reset engine's internal OpenGL state variables
extern BOOL GFX_abTexture[GFX_MAXTEXUNITS];
for( INDEX iUnit=0; iUnit<GFX_MAXTEXUNITS; iUnit++) {
GFX_abTexture[iUnit] = FALSE;
GFX_iTexModulation[iUnit] = 1;
}
// set default texture unit and modulation mode
GFX_iActiveTexUnit = 0;
gl_ctMaxStreams = 16; // GL always has enough "streams" for multi-texturing
// reset frustum/ortho stuff
extern BOOL GFX_bViewMatrix;
extern FLOAT GFX_fLastL, GFX_fLastR, GFX_fLastT, GFX_fLastB, GFX_fLastN, GFX_fLastF;
GFX_fLastL = GFX_fLastR = GFX_fLastT = GFX_fLastB = GFX_fLastN = GFX_fLastF = 0;
GFX_bViewMatrix = TRUE;
glbUsingVARs = FALSE;
GFX_bTruform = FALSE;
GFX_bClipping = TRUE;
pglEnable( GL_TEXTURE_2D); GFX_abTexture[0] = TRUE;
pglEnable( GL_DITHER); GFX_bDithering = TRUE;
pglDisable( GL_BLEND); GFX_bBlending = FALSE;
pglDisable( GL_DEPTH_TEST); GFX_bDepthTest = FALSE;
pglDisable( GL_ALPHA_TEST); GFX_bAlphaTest = FALSE;
pglDisable( GL_CLIP_PLANE0); GFX_bClipPlane = FALSE;
pglDisable( GL_CULL_FACE); GFX_eCullFace = GFX_NONE;
pglFrontFace( GL_CCW); GFX_bFrontFace = TRUE;
pglDepthMask( GL_FALSE); GFX_bDepthWrite = FALSE;
pglDepthFunc( GL_LEQUAL); GFX_eDepthFunc = GFX_LESS_EQUAL;
pglBlendFunc( GL_ONE, GL_ONE); GFX_eBlendSrc = GFX_eBlendDst = GFX_ONE;
pglDepthRange( 0.0f, 1.0f); GFX_fMinDepthRange = 0.0f;
GFX_fMaxDepthRange = 1.0f;
// (re)set some OpenGL defaults
gfxPolygonMode( GFX_FILL);
pglShadeModel( GL_SMOOTH);
pglEnable( GL_SCISSOR_TEST);
pglDrawBuffer( GL_BACK);
pglAlphaFunc( GL_GEQUAL, 0.5f);
pglColor4f( 1.0f, 1.0f, 1.0f, 1.0f);
pglMatrixMode( GL_MODELVIEW);
pglLoadIdentity();
pglMatrixMode( GL_TEXTURE);
pglLoadIdentity();
// enable rendering only thru vertex arrays by default
pglEnableClientState( GL_VERTEX_ARRAY);
pglDisableClientState( GL_NORMAL_ARRAY);
pglDisableClientState( GL_TEXTURE_COORD_ARRAY);
pglDisableClientState( GL_COLOR_ARRAY);
GFX_bColorArray = FALSE;
// set single byte pixel alignment
pglPixelStorei( GL_PACK_ALIGNMENT, 1);
pglPixelStorei( GL_UNPACK_ALIGNMENT, 1);
// TEST EXTENSIONS
CDisplayAdapter &da = gl_gaAPI[GAT_OGL].ga_adaAdapter[gl_iCurrentAdapter];
da.da_strVendor = (const char*)pglGetString(GL_VENDOR);
da.da_strRenderer = (const char*)pglGetString(GL_RENDERER);
da.da_strVersion = (const char*)pglGetString(GL_VERSION);
go_strExtensions = (const char*)pglGetString(GL_EXTENSIONS);
// report
CPrintF( TRANS("\n* OpenGL context created: *----------------------------------\n"));
CPrintF( " (%s, %s, %s)\n\n", da.da_strVendor, da.da_strRenderer, da.da_strVersion);
// test for used extensions
GLint gliRet;
GLfloat glfRet;
go_strSupportedExtensions = "";
// check for WGL extensions, too
go_strWinExtensions = "";
pwglGetExtensionsStringARB = (char* (__stdcall*)(HDC))pwglGetProcAddress("wglGetExtensionsStringARB");
if( pwglGetExtensionsStringARB != NULL) {
AddExtension_OGL( NONE, "WGL_ARB_extensions_string"); // register
CTempDC tdc(gl_pvpActive->vp_hWnd);
go_strWinExtensions = (char*)pwglGetExtensionsStringARB(tdc.hdc);
}
// multitexture is supported only thru GL_EXT_texture_env_combine extension
gl_ctTextureUnits = 1;
gl_ctRealTextureUnits = 1;
pglActiveTextureARB = NULL;
pglClientActiveTextureARB = NULL;
if( HasExtension( go_strExtensions, "GL_ARB_multitexture")) {
pglGetIntegerv( GL_MAX_TEXTURE_UNITS_ARB, (int*)&gl_ctRealTextureUnits); // get number of texture units
if( gl_ctRealTextureUnits>1 && HasExtension( go_strExtensions, "GL_EXT_texture_env_combine")) {
AddExtension_OGL( NONE, "GL_ARB_multitexture");
AddExtension_OGL( NONE, "GL_EXT_texture_env_combine");
pglActiveTextureARB = (void (__stdcall*)(GLenum))pwglGetProcAddress( "glActiveTextureARB");
pglClientActiveTextureARB = (void (__stdcall*)(GLenum))pwglGetProcAddress( "glClientActiveTextureARB");
ASSERT( pglActiveTextureARB!=NULL && pglClientActiveTextureARB!=NULL);
gl_ctTextureUnits = Min( GFX_MAXTEXUNITS, gl_ctRealTextureUnits);
} else {
CPrintF( TRANS(" GL_TEXTURE_ENV_COMBINE extension missing - multi-texturing cannot be used.\n"));
}
}
// find all supported texture compression extensions
TestExtension_OGL( GLF_EXTC_ARB, "GL_ARB_texture_compression");
TestExtension_OGL( GLF_EXTC_S3TC, "GL_EXT_texture_compression_s3tc");
TestExtension_OGL( GLF_EXTC_FXT1, "GL_3DFX_texture_compression_FXT1");
TestExtension_OGL( GLF_EXTC_LEGACY, "GL_S3_s3tc");
// mark if there is at least one extension present
gl_ulFlags &= ~GLF_TEXTURECOMPRESSION;
if( (gl_ulFlags&GLF_EXTC_ARB) || (gl_ulFlags&GLF_EXTC_FXT1)
|| (gl_ulFlags&GLF_EXTC_S3TC) || (gl_ulFlags&GLF_EXTC_LEGACY)) {
gl_ulFlags |= GLF_TEXTURECOMPRESSION;
}
// determine max supported dimension of texture
pglGetIntegerv( GL_MAX_TEXTURE_SIZE, (GLint*)&gl_pixMaxTextureDimension);
OGL_CHECKERROR;
// determine support for texture LOD biasing
gl_fMaxTextureLODBias = 0.0f;
if( HasExtension( go_strExtensions, "GL_EXT_texture_lod_bias")) {
AddExtension_OGL( NONE, "GL_EXT_texture_lod_bias"); // register
// check max possible lod bias (absolute)
pglGetFloatv( GL_MAX_TEXTURE_LOD_BIAS_EXT, &glfRet);
GLenum gleError = pglGetError(); // just because of invalid extension implementations (S3)
if( gleError || glfRet<0.1f || glfRet>4.0f) glfRet = 4.0f;
gl_fMaxTextureLODBias = glfRet;
OGL_CHECKERROR;
}
// determine support for anisotropic filtering
gl_iMaxTextureAnisotropy = 1;
if( HasExtension( go_strExtensions, "GL_EXT_texture_filter_anisotropic")) {
AddExtension_OGL( NONE, "GL_EXT_texture_filter_anisotropic"); // register
// keep max allowed anisotropy degree
pglGetIntegerv( GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &gliRet);
gl_iMaxTextureAnisotropy = gliRet;
OGL_CHECKERROR;
}
// check support for compiled vertex arrays
pglLockArraysEXT = NULL;
pglUnlockArraysEXT = NULL;
if( HasExtension( go_strExtensions, "GL_EXT_compiled_vertex_array")) {
AddExtension_OGL( GLF_EXT_COMPILEDVERTEXARRAY, "GL_EXT_compiled_vertex_array");
pglLockArraysEXT = (void (__stdcall*)(GLint,GLsizei))pwglGetProcAddress( "glLockArraysEXT");
pglUnlockArraysEXT = (void (__stdcall*)(void) )pwglGetProcAddress( "glUnlockArraysEXT");
ASSERT( pglLockArraysEXT!=NULL && pglUnlockArraysEXT!=NULL);
}
// check support for swap interval
pwglSwapIntervalEXT = NULL;
pwglGetSwapIntervalEXT = NULL;
if( HasExtension( go_strExtensions, "WGL_EXT_swap_control")) {
AddExtension_OGL( GLF_VSYNC, "WGL_EXT_swap_control");
pwglSwapIntervalEXT = (GLboolean (__stdcall*)(GLint))pwglGetProcAddress( "wglSwapIntervalEXT");
pwglGetSwapIntervalEXT = (GLint (__stdcall*)(void) )pwglGetProcAddress( "wglGetSwapIntervalEXT");
ASSERT( pwglSwapIntervalEXT!=NULL && pwglGetSwapIntervalEXT!=NULL);
}
// determine support for ATI Truform technology
extern INDEX truform_iLevel;
extern BOOL truform_bLinear;
truform_iLevel = -1;
truform_bLinear = FALSE;
pglPNTrianglesiATI = NULL;
pglPNTrianglesfATI = NULL;
gl_iTessellationLevel = 0;
gl_iMaxTessellationLevel = 0;
if( HasExtension( go_strExtensions, "GL_ATI_pn_triangles")) {
AddExtension_OGL( NONE, "GL_ATI_pn_triangles");
pglPNTrianglesiATI = (void (__stdcall*)(GLenum,GLint ))pwglGetProcAddress( "glPNTrianglesiATI");
pglPNTrianglesfATI = (void (__stdcall*)(GLenum,GLfloat))pwglGetProcAddress( "glPNTrianglesfATI");
ASSERT( pglPNTrianglesiATI!=NULL && pglPNTrianglesfATI!=NULL);
// check max possible tessellation
pglGetIntegerv( GL_MAX_PN_TRIANGLES_TESSELATION_LEVEL_ATI, &gliRet);
gl_iMaxTessellationLevel = gliRet;
OGL_CHECKERROR;
}
// if T-buffer is supported
if( _TBCapability) {
// add extension and disable t-buffer usage by default
AddExtension_OGL( GLF_EXT_TBUFFER, "GL_3DFX_multisample");
pglDisable( GL_MULTISAMPLE_3DFX);
OGL_CHECKERROR;
}
// test for clamp to edge
TestExtension_OGL( GLF_EXT_EDGECLAMP, "GL_EXT_texture_edge_clamp");
// test for clip volume hint
TestExtension_OGL( GLF_EXT_CLIPHINT, "GL_EXT_clip_volume_hint");
/*
// test for occlusion culling
TestExtension_OGL( GLF_EXT_OCCLUSIONTEST, "GL_HP_occlusion_test");
pglGenOcclusionQueriesNV = NULL; pglDeleteOcclusionQueriesNV = NULL;
pglBeginOcclusionQueryNV = NULL; pglEndOcclusionQueryNV = NULL;
pglGetOcclusionQueryivNV = NULL; pglGetOcclusionQueryuivNV = NULL;
pglIsOcclusionQueryNV = NULL;
if( HasExtension( go_strExtensions, "GL_NV_occlusion_query"))
{ // prepare extension's functions
AddExtension_OGL( GLF_EXT_OCCLUSIONQUERY, "GL_NV_occlusion_query");
pglGenOcclusionQueriesNV = (void (__stdcall*)(GLsizei, GLuint*))pwglGetProcAddress( "glGenOcclusionQueriesNV");
pglDeleteOcclusionQueriesNV = (void (__stdcall*)(GLsizei, const GLuint*))pwglGetProcAddress( "glDeleteOcclusionQueriesNV");
pglBeginOcclusionQueryNV = (void (__stdcall*)(GLuint))pwglGetProcAddress( "glBeginOcclusionQueryNV");
pglEndOcclusionQueryNV = (void (__stdcall*)(void))pwglGetProcAddress( "glEndOcclusionQueryNV");
pglGetOcclusionQueryivNV = (void (__stdcall*)(GLuint, GLenum, GLint*))pwglGetProcAddress( "glGetOcclusionQueryivNV");
pglGetOcclusionQueryuivNV = (void (__stdcall*)(GLuint, GLenum, GLuint*))pwglGetProcAddress( "glGetOcclusionQueryuivNV");
pglIsOcclusionQueryNV = (GLboolean (__stdcall*)(GLuint))pwglGetProcAddress( "glIsOcclusionQueryNV");
ASSERT( pglGenOcclusionQueriesNV!=NULL && pglDeleteOcclusionQueriesNV!=NULL
&& pglBeginOcclusionQueryNV!=NULL && pglEndOcclusionQueryNV!=NULL
&& pglGetOcclusionQueryivNV!=NULL && pglGetOcclusionQueryuivNV!=NULL
&& pglIsOcclusionQueryNV!=NULL);
}
*/
// done with seeking for supported extensions
if( go_strSupportedExtensions=="") go_strSupportedExtensions = "none";
// allocate vertex buffers
// eglAdjustVertexBuffers(ogl_iVertexBufferSize*1024);
// OGL_CHECKERROR;
// check if 32-bit textures are supported
GLuint uiTmpTex;
const ULONG ulTmpTex = 0xFFFFFFFF;
pglGenTextures( 1, &uiTmpTex);
pglBindTexture( GL_TEXTURE_2D, uiTmpTex);
pglTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, 1,1, 0, GL_RGBA, GL_UNSIGNED_BYTE, &ulTmpTex);
OGL_CHECKERROR;
gl_ulFlags &= ~GLF_32BITTEXTURES;
pglGetTexLevelParameteriv( GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_SIZE, &gliRet);
if( gliRet==8) gl_ulFlags |= GLF_32BITTEXTURES;
pglDeleteTextures( 1, &uiTmpTex);
OGL_CHECKERROR;
// setup fog and haze textures
extern PIX _fog_pixSizeH;
extern PIX _fog_pixSizeL;
extern PIX _haze_pixSize;
pglGenTextures( 1, (GLuint*)&_fog_ulTexture);
pglGenTextures( 1, (GLuint*)&_haze_ulTexture);
_fog_pixSizeH = 0;
_fog_pixSizeL = 0;
_haze_pixSize = 0;
OGL_CHECKERROR;
// prepare pattern texture
extern CTexParams _tpPattern;
extern ULONG _ulPatternTexture;
extern ULONG _ulLastUploadedPattern;
pglGenTextures( 1, (GLuint*)&_ulPatternTexture);
_ulLastUploadedPattern = 0;
_tpPattern.Clear();
// reset texture filtering and array locking
_tpGlobal[0].Clear();
_tpGlobal[1].Clear();
_tpGlobal[2].Clear();
_tpGlobal[3].Clear();
GFX_ctVertices = 0;
gl_dwVertexShader = NONE;
// set default texture filtering/biasing
extern INDEX gap_iTextureFiltering;
extern INDEX gap_iTextureAnisotropy;
extern FLOAT gap_fTextureLODBias;
gfxSetTextureFiltering( gap_iTextureFiltering, gap_iTextureAnisotropy);
gfxSetTextureBiasing( gap_fTextureLODBias);
// mark pretouching and probing
extern BOOL _bNeedPretouch;
_bNeedPretouch = TRUE;
gl_bAllowProbing = FALSE;
// update console system vars
extern void UpdateGfxSysCVars(void);
UpdateGfxSysCVars();
// reload all loaded textures and eventually shadows
extern INDEX shd_bCacheAll;
extern void ReloadTextures(void);
extern void CacheShadows(void);
ReloadTextures();
if( shd_bCacheAll) CacheShadows();
}
// initialize OpenGL driver
BOOL CGfxLibrary::InitDriver_OGL( BOOL b3Dfx/*=FALSE*/)
{
ASSERT( gl_hiDriver==NONE);
UINT iOldErrorMode = SetErrorMode( SEM_NOOPENFILEERRORBOX|SEM_FAILCRITICALERRORS);
CTString strDriverFileName = b3Dfx ? "3DFXVGL.DLL" : "OPENGL32.DLL";
try
{ // if driver doesn't exists on disk
char strBuffer[_MAX_PATH+1];
char *strDummy;
int iRes = SearchPathA( NULL, strDriverFileName, NULL, _MAX_PATH, strBuffer, &strDummy);
if( iRes==0) ThrowF_t(TRANS("OpenGL driver '%s' not present"), strDriverFileName);
// load opengl library
gl_hiDriver = ::LoadLibraryA( strDriverFileName);
// if it cannot be loaded (although it is present on disk)
if( gl_hiDriver==NONE) {
// if it is 3dfx stand-alone driver
if( b3Dfx) {
// do a fatal error and inform user to deinstall it,
// since this loading attempt probably messed up the entire system
FatalError(TRANS( "3Dfx OpenGL driver '%s' is installed, but cannot be loaded!\n"
"If you previously had a 3Dfx card and it was removed,\n"
"please deinstall the driver and restart windows before\n"
"continuing.\n"), strDriverFileName);
} // fail!
ThrowF_t(TRANS("Cannot load OpenGL driver '%s'"), strDriverFileName);
}
// prepare functions
OGL_SetFunctionPointers_t(gl_hiDriver);
}
catch( char *strError)
{ // didn't make it :(
if( gl_hiDriver!=NONE) FreeLibrary(gl_hiDriver);
gl_hiDriver = NONE;
CPrintF( TRANS("Error starting OpenGL: %s\n"), strError);
SetErrorMode(iOldErrorMode);
return FALSE;
}
// revert to old error mode
SetErrorMode(iOldErrorMode);
// if default driver
if( !b3Dfx) {
// use GDI functions
pwglSwapBuffers = ::SwapBuffers;
pwglSetPixelFormat = ::SetPixelFormat;
pwglChoosePixelFormat = ::ChoosePixelFormat;
// NOTE:
// some ICD implementations are not infact in OPENGL32.DLL, but in some
// other installed DLL, which is loaded when original OPENGL32.DLL from MS is
// loaded. For those, we in fact load OPENGL32.DLL from MS, so we must _not_
// call these functions directly, because they are in MS dll. We must call
// functions from GDI, which in turn call either OPENGL32.DLL, _or_ the client driver,
// as appropriate.
}
// done
return TRUE;
}
// shutdown OpenGL driver
void CGfxLibrary::EndDriver_OGL(void)
{
// unbind all textures
if( _pTextureStock!=NULL) {
{FOREACHINDYNAMICCONTAINER( _pTextureStock->st_ctObjects, CTextureData, ittd) {
CTextureData &td = *ittd;
td.td_tpLocal.Clear();
td.Unbind();
}}
}
// unbind fog, haze and flat texture
gfxDeleteTexture( _fog_ulTexture);
gfxDeleteTexture( _haze_ulTexture);
ASSERT( _ptdFlat!=NULL);
_ptdFlat->td_tpLocal.Clear();
_ptdFlat->Unbind();
// shut the driver down
if( go_hglRC!=NULL) {
if( pwglMakeCurrent!=NULL) {
BOOL bRes = pwglMakeCurrent(NULL, NULL);
WIN_CHECKERROR( bRes, "MakeCurrent(NULL, NULL)");
}
ASSERT( pwglDeleteContext!=NULL);
BOOL bRes = pwglDeleteContext(go_hglRC);
WIN_CHECKERROR( bRes, "DeleteContext");
go_hglRC = NULL;
}
OGL_ClearFunctionPointers();
}
// prepare current viewport for rendering thru OpenGL
BOOL CGfxLibrary::SetCurrentViewport_OGL(CViewPort *pvp)
{
// if must init entire opengl
if( gl_ulFlags & GLF_INITONNEXTWINDOW)
{
gl_ulFlags &= ~GLF_INITONNEXTWINDOW;
// reopen window
pvp->CloseCanvas();
pvp->OpenCanvas();
// init now
CTempDC tdc(pvp->vp_hWnd);
if( !CreateContext_OGL(tdc.hdc)) return FALSE;
gl_pvpActive = pvp; // remember as current viewport (must do that BEFORE InitContext)
InitContext_OGL();
pvp->vp_ctDisplayChanges = gl_ctDriverChanges;
return TRUE;
}
// if window was not set for this driver
if( pvp->vp_ctDisplayChanges<gl_ctDriverChanges)
{
// reopen window
pvp->CloseCanvas();
pvp->OpenCanvas();
// set it
CTempDC tdc(pvp->vp_hWnd);
if( !SetupPixelFormat_OGL(tdc.hdc)) return FALSE;
pvp->vp_ctDisplayChanges = gl_ctDriverChanges;
}
if( gl_pvpActive!=NULL) {
// fail, if only one window is allowed (3dfx driver), already initialized and trying to set non-primary viewport
const BOOL bOneWindow = (gl_gaAPI[GAT_OGL].ga_adaAdapter[gl_iCurrentAdapter].da_ulFlags & DAF_ONEWINDOW);
if( bOneWindow && gl_pvpActive->vp_hWnd!=NULL && gl_pvpActive->vp_hWnd!=pvp->vp_hWnd) return FALSE;
// no need to set context if it is the same window as last time
if( gl_pvpActive->vp_hWnd==pvp->vp_hWnd) return TRUE;
}
// try to set context to this window
pwglMakeCurrent( NULL, NULL);
CTempDC tdc(pvp->vp_hWnd);
// fail, if cannot set context to this window
if( !pwglMakeCurrent( tdc.hdc, go_hglRC)) return FALSE;
// remember as current window
gl_pvpActive = pvp;
return TRUE;
}
/*
* 3dfx t-buffer control
*/
extern void SetTBufferEffect( BOOL bEnable)
{
// adjust console vars
ogl_iTBufferEffect = Clamp( ogl_iTBufferEffect, 0L, 2L);
ogl_iTBufferSamples = (1L) << FastLog2(ogl_iTBufferSamples);
if( ogl_iTBufferSamples<2) ogl_iTBufferSamples = 4;
// if supported
if( _pGfx->gl_ulFlags&GLF_EXT_TBUFFER)
{ // disable multisampling if not required
ASSERT( pglTBufferMask3DFX!=NULL);
if( ogl_iTBufferEffect==0 || _pGfx->go_ctSampleBuffers<2 || !bEnable) pglDisable( GL_MULTISAMPLE_3DFX);
else {
pglEnable( GL_MULTISAMPLE_3DFX);
UINT uiMask = 0xFFFFFFFF;
// set one buffer in case of motion-blur
if( ogl_iTBufferEffect==2) uiMask = (1UL) << _pGfx->go_iCurrentWriteBuffer;
//pglTBufferMask3DFX(uiMask);
}
}
}
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