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source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/RenderTexture.cpp @ 2808

Revision 2808, 38.7 KB checked in by mattausch, 17 years ago (diff)

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1	//------------------------------------------------------------------------------
2	// File : RenderTexture.cpp
3	//------------------------------------------------------------------------------
4	// Copyright 2002 Mark J. Harris and
5	// The University of North Carolina at Chapel Hill
6	//------------------------------------------------------------------------------
7	// Permission to use, copy, modify, distribute and sell this software and its
8	// documentation for any purpose is hereby granted without fee, provided that
9	// the above copyright notice appear in all copies and that both that copyright
10	// notice and this permission notice appear in supporting documentation.
11	// Binaries may be compiled with this software without any royalties or
12	// restrictions.
13	//
14	// The author(s) and The University of North Carolina at Chapel Hill make no
15	// representations about the suitability of this software for any purpose.
16	// It is provided "as is" without express or implied warranty.
17	//
18	// -----------------------------------------------------------------------------
19	// Credits:
20	// Original RenderTexture class: Mark J. Harris
21	// Original Render-to-depth-texture support: Thorsten Scheuermann
22	// Linux Copy-to-texture: Eric Werness
23	// Various Bug Fixes: Daniel (Redge) Sperl
24	// Bill Baxter
25	//
26	// -----------------------------------------------------------------------------
27	/**
28	* @file RenderTexture.cpp
29	*
30	* Implementation of class RenderTexture. A multi-format render to
31	* texture wrapper.
32	*/
33	#include "RenderTexture.h"
34	#include <GL/glut.h>
35	#include <stdio.h>
36	#include <stdlib.h>
37	#include <stdarg.h>
38	#include <assert.h>
39
40	//------------------------------------------------------------------------------
41	// Function : IsPowerOfTwo
42	// Description :
43	//------------------------------------------------------------------------------
44	/**
45	* @fn IsPowerOfTwo(int n)
46	* @brief Returns true if /param n is an integer power of 2.
47	*
48	* Taken from Steve Baker's Cute Code Collection.
49	*/
50	bool IsPowerOfTwo(int n)
51	{
52	return ((n&(n-1))==0);
53	}
54
55	//------------------------------------------------------------------------------
56	// Function : RenderTexture::RenderTexture
57	// Description :
58	//------------------------------------------------------------------------------
59	/**
60	* @fn RenderTexture::RenderTexture()
61	* @brief Constructor.
62	*/
63	RenderTexture::RenderTexture(int iWidth, int iHeight, bool bIsTexture /* = true */,
64	bool bIsDepthTexture /* = false */)
65	: _iWidth(iWidth),
66	_iHeight(iHeight),
67	_bIsTexture(bIsTexture),
68	_bIsDepthTexture(bIsDepthTexture),
69	_bHasArbDepthTexture(true), // [Redge]
70	_eUpdateMode(RT_RENDER_TO_TEXTURE),
71	_bInitialized(false),
72	_bFloat(false),
73	_bRectangle(false),
74	_bHasDepth(false),
75	_bHasStencil(false),
76	_bMipmap(false),
77	_bAnisoFilter(false),
78	#ifdef _WIN32
79	_hDC(NULL),
80	_hGLContext(NULL),
81	_hPBuffer(NULL),
82	_hPreviousDC(0),
83	_hPreviousContext(0),
84	#else
85	_pDpy(NULL),
86	_hGLContext(NULL),
87	_hPBuffer(0),
88	_hPreviousContext(0),
89	_hPreviousDrawable(0),
90	#endif
91	_iTextureTarget(GL_NONE),
92	_iTextureID(0),
93	_pPoorDepthTexture(0) // [Redge]
94	{
95	assert(iWidth > 0 && iHeight > 0);
96	_iBits[0] = _iBits[1] = _iBits[2] = _iBits[3] = 0;
97	_bRectangle = !(IsPowerOfTwo(iWidth) && IsPowerOfTwo(iHeight));
98	}
99
100
101	//------------------------------------------------------------------------------
102	// Function : RenderTexture::~RenderTexture
103	// Description :
104	//------------------------------------------------------------------------------
105	/**
106	* @fn RenderTexture::~RenderTexture()
107	* @brief Destructor.
108	*/
109	RenderTexture::~RenderTexture()
110	{
111	_Invalidate();
112	}
113
114
115	//------------------------------------------------------------------------------
116	// Function : wglGetLastError
117	// Description :
118	//------------------------------------------------------------------------------
119	/**
120	* @fn wglGetLastError()
121	* @brief Returns the last windows error generated.
122	*/
123	#ifdef _WIN32
124	void RenderTexture::_wglGetLastError()
125	{
126	#ifdef _DEBUG
127
128	DWORD err = GetLastError();
129	switch(err)
130	{
131	case ERROR_INVALID_PIXEL_FORMAT:
132	fprintf(stderr, "Win32 Error: ERROR_INVALID_PIXEL_FORMAT\n");
133	break;
134	case ERROR_NO_SYSTEM_RESOURCES:
135	fprintf(stderr, "Win32 Error: ERROR_NO_SYSTEM_RESOURCES\n");
136	break;
137	case ERROR_INVALID_DATA:
138	fprintf(stderr, "Win32 Error: ERROR_INVALID_DATA\n");
139	break;
140	case ERROR_INVALID_WINDOW_HANDLE:
141	fprintf(stderr, "Win32 Error: ERROR_INVALID_WINDOW_HANDLE\n");
142	break;
143	case ERROR_RESOURCE_TYPE_NOT_FOUND:
144	fprintf(stderr, "Win32 Error: ERROR_RESOURCE_TYPE_NOT_FOUND\n");
145	break;
146	case ERROR_SUCCESS:
147	// no error
148	break;
149	default:
150	LPVOID lpMsgBuf;
151	FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER \|
152	FORMAT_MESSAGE_FROM_SYSTEM \|
153	FORMAT_MESSAGE_IGNORE_INSERTS,
154	NULL,
155	err,
156	MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
157	(LPTSTR) &lpMsgBuf,
158	0,
159	NULL);
160
161	fprintf(stderr, "Win32 Error %d: %s\n", err, lpMsgBuf);
162	LocalFree( lpMsgBuf );
163	break;
164	}
165	SetLastError(0);
166
167	#endif // _DEBUG
168	}
169	#endif
170
171	//------------------------------------------------------------------------------
172	// Function : PrintExtensionError
173	// Description :
174	//------------------------------------------------------------------------------
175	/**
176	* @fn PrintExtensionError( char* strMsg, ... )
177	* @brief Prints an error about missing OpenGL extensions.
178	*/
179	void PrintExtensionError( char* strMsg, ... )
180	{
181	fprintf(stderr, "Error: RenderTexture requires the following unsupported "
182	"OpenGL extensions: \n");
183	char strBuffer[512];
184	va_list args;
185	va_start(args, strMsg);
186	#ifdef _WIN32
187	_vsnprintf( strBuffer, 512, strMsg, args );
188	#else
189	vsnprintf( strBuffer, 512, strMsg, args );
190	#endif
191	va_end(args);
192
193	fprintf(stderr, strMsg);
194
195	exit(1);
196	}
197
198
199	//------------------------------------------------------------------------------
200	// Function : RenderTexture::Initialize
201	// Description :
202	//------------------------------------------------------------------------------
203	/**
204	* @fn RenderTexture::Initialize(bool bShare, bool bDepth, bool bStencil, bool bMipmap, bool bAnisoFilter, unsigned int iRBits, unsigned int iGBits, unsigned int iBBits, unsigned int iABits);
205	* @brief Initializes the RenderTexture, sharing display lists and textures if specified.
206	*
207	* This function actually does the creation of the p-buffer. It can only be called
208	* once a GL context has already been created. Note that if the texture is not
209	* power of two dimensioned, or has more than 8 bits per channel, enabling mipmapping
210	* or aniso filtering will cause an error.
211	*/
212	bool RenderTexture::Initialize(bool bShare /* = true */,
213	bool bDepth /* = false */,
214	bool bStencil /* = false */,
215	bool bMipmap /* = false */,
216	bool bAnisoFilter /* = false */,
217	unsigned int iRBits /* = 8 */,
218	unsigned int iGBits /* = 8 */,
219	unsigned int iBBits /* = 8 */,
220	unsigned int iABits /* = 8 */,
221	UpdateMode updateMode /* = RT_RENDER_TO_TEXTURE */)
222	{
223	#ifdef _WIN32
224	if (!WGLEW_ARB_pbuffer)
225	{
226	PrintExtensionError("WGL_ARB_pbuffer");
227	return false;
228	}
229	if (!WGLEW_ARB_pixel_format)
230	{
231	PrintExtensionError("WGL_ARB_pixel_format");
232	return false;
233	}
234	if (_bIsTexture && !WGLEW_ARB_render_texture)
235	{
236	PrintExtensionError("WGL_ARB_render_texture");
237	return false;
238	}
239	if (_bIsDepthTexture && !GLEW_ARB_depth_texture)
240	{
241	// [Redge]
242	#if defined(_DEBUG) \|\| defined(DEBUG)
243	fprintf(stderr, "Warning: OpenGL extension GL_ARB_depth_texture not available.\n"
244	" Using glReadPixels() to emulate behavior.\n");
245	#endif
246	_bHasArbDepthTexture = false;
247	//PrintExtensionError("GL_ARB_depth_texture");
248	//return false;
249	// [/Redge]
250	}
251	SetLastError(0);
252	#else // _WIN32
253	if (!GLXEW_SGIX_pbuffer)
254	{
255	PrintExtensionError("GLX_SGIX_pbuffer");
256	return false;
257	}
258	if (!GLXEW_SGIX_fbconfig)
259	{
260	PrintExtensionError("GLX_SGIX_fbconfig");
261	return false;
262	}
263	if (_bIsDepthTexture)
264	{
265	PrintExtensionError("I don't know");
266	return false;
267	}
268	if (updateMode == RT_RENDER_TO_TEXTURE)
269	{
270	PrintExtensionError("Some GLX render texture extension");
271	}
272	#endif // _WIN32
273
274	if (_bInitialized)
275	_Invalidate();
276
277	_bFloat = (iRBits > 8 \|\| iGBits > 8 \|\| iBBits > 8 \|\| iABits > 8);
278
279	bool bNVIDIA = true;
280	#ifdef _WIN32
281	if (_bFloat && !GLEW_NV_float_buffer)
282	{
283	bNVIDIA = false;
284	if (!WGLEW_ATI_pixel_format_float)
285	{
286	PrintExtensionError("GL_NV_float_buffer or GL_ATI_pixel_format_float");
287	return false;
288	}
289	}
290	if (_bFloat && _bIsTexture && !bNVIDIA && !GLEW_ATI_texture_float)
291	{
292	PrintExtensionError("NV_float_buffer or ATI_texture_float");
293	}
294	#else // _WIN32
295	if (_bFloat && _bIsTexture && !GLXEW_NV_float_buffer)
296	{
297	PrintExtensionError("GLX_NV_float_buffer");
298	return false;
299	}
300	#endif // _WIN32
301	if (!_bFloat && !GLEW_NV_texture_rectangle)
302	{
303	bNVIDIA = false;
304	}
305
306	_bRectangle = _bRectangle \|\| (_bFloat && bNVIDIA);
307
308	if(_bIsDepthTexture)
309	_bHasDepth = true; // we need depth for a depth texture...
310	else
311	_bHasDepth = bDepth;
312
313	_bHasStencil = bStencil;
314	_bMipmap = false; // until it is enabled.
315	_bAnisoFilter = false; // until it is enabled.
316	_eUpdateMode = updateMode;
317
318	GLuint iWGLTextureTarget = 0;
319	GLuint iBindTarget = 0;
320	GLuint iTextureFormat = 0;
321	GLuint iDepthBindTarget = 0;
322	GLuint iDepthTextureFormat = 0;
323
324	if (_bIsTexture)
325	glGenTextures(1, &_iTextureID);
326	if (_bIsDepthTexture)
327	glGenTextures(1, &_iDepthTextureID);
328
329	// Determine the appropriate texture formats and filtering modes.
330	if (_bIsTexture)
331	{
332	if (_bFloat)
333	{
334	if (!bNVIDIA && _bRectangle)
335	{
336	fprintf(stderr,
337	"RenderTexture Error: ATI textures must be power-of-two-dimensioned.\n");
338	return false;
339	}
340
341	if (bNVIDIA)
342	_iTextureTarget = GL_TEXTURE_RECTANGLE_NV;
343	else
344	_iTextureTarget = GL_TEXTURE_2D;
345
346	glBindTexture(_iTextureTarget, _iTextureID);
347
348	// We'll use clamp to edge as the default texture wrap mode for all tex types
349	glTexParameteri( _iTextureTarget, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
350	glTexParameteri( _iTextureTarget, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
351	glTexParameteri( _iTextureTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
352	glTexParameteri( _iTextureTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
353
354	if (bMipmap)
355	{
356	fprintf(stderr,
357	"RenderTexture Error: float textures do not support mipmaps\n");
358	return false;
359	}
360
361	if (RT_COPY_TO_TEXTURE == _eUpdateMode)
362	{
363	GLuint iInternalFormat;
364	GLuint iFormat;
365	if (iABits > 0)
366	{
367	if (bNVIDIA)
368	iInternalFormat = (iABits > 16) ? GL_FLOAT_RGBA32_NV : GL_FLOAT_RGBA16_NV;
369	else
370	iInternalFormat = (iABits > 16) ? GL_RGBA_FLOAT32_ATI : GL_RGBA_FLOAT16_ATI;
371	iFormat = GL_RGBA;
372	}
373	else if (iBBits > 0)
374	{
375	if (bNVIDIA)
376	iInternalFormat = (iBBits > 16) ? GL_FLOAT_RGB32_NV : GL_FLOAT_RGB16_NV;
377	else
378	iInternalFormat = (iBBits > 16) ? GL_RGB_FLOAT32_ATI : GL_RGB_FLOAT16_ATI;
379	iFormat = GL_RGB;
380	}
381	else if (iGBits > 0)
382	{
383	if (bNVIDIA)
384	iInternalFormat = (iGBits > 16) ? GL_FLOAT_RG32_NV : GL_FLOAT_RG16_NV;
385	else
386	iInternalFormat = (iGBits > 16) ? GL_LUMINANCE_ALPHA_FLOAT32_ATI :
387	GL_LUMINANCE_ALPHA_FLOAT16_ATI;
388	iFormat = GL_LUMINANCE_ALPHA;
389	}
390	else
391	{
392	if (bNVIDIA)
393	iInternalFormat = (iRBits > 16) ? GL_FLOAT_R32_NV : GL_FLOAT_R16_NV;
394	else
395	iInternalFormat = (iRBits > 16) ? GL_LUMINANCE_FLOAT32_ATI :
396	GL_LUMINANCE_FLOAT16_ATI;
397	iFormat = GL_LUMINANCE;
398	}
399	// Allocate the texture image (but pass it no data for now).
400	glTexImage2D(_iTextureTarget, 0, iInternalFormat, _iWidth, _iHeight,
401	0, iFormat, GL_FLOAT, NULL);
402	}
403	else
404	{
405	#ifdef _WIN32
406	if (bNVIDIA)
407	iWGLTextureTarget = WGL_TEXTURE_RECTANGLE_NV;
408	else
409	iWGLTextureTarget = WGL_TEXTURE_2D_ARB;
410
411	if (iABits > 0)
412	{
413	if (bNVIDIA)
414	{
415	iBindTarget = WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_RGBA_NV;
416	iTextureFormat = WGL_TEXTURE_FLOAT_RGBA_NV;
417	}
418	else
419	{
420	iBindTarget = WGL_BIND_TO_TEXTURE_RGBA_ARB;
421	iTextureFormat = WGL_TEXTURE_RGBA_ARB;
422	}
423	}
424	else if (iBBits > 0)
425	{
426	if (bNVIDIA)
427	{
428	iBindTarget = WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_RGB_NV;
429	iTextureFormat = WGL_TEXTURE_FLOAT_RGB_NV;
430	}
431	else
432	{
433	iBindTarget = WGL_BIND_TO_TEXTURE_RGB_ARB;
434	iTextureFormat = WGL_TEXTURE_RGB_ARB;
435	}
436	}
437	else if (iGBits > 0)
438	{
439	if (bNVIDIA)
440	{
441	iBindTarget = WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_RG_NV;
442	iTextureFormat = WGL_TEXTURE_FLOAT_RG_NV;
443	}
444	else
445	{
446	iBindTarget = WGL_BIND_TO_TEXTURE_RGB_ARB;
447	iTextureFormat = WGL_TEXTURE_RGB_ARB;
448	}
449	}
450	else
451	{
452	if (bNVIDIA)
453	{
454	iBindTarget = WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_R_NV;
455	iTextureFormat = WGL_TEXTURE_FLOAT_R_NV;
456	}
457	else
458	{
459	iBindTarget = WGL_BIND_TO_TEXTURE_RGB_ARB;
460	iTextureFormat = WGL_TEXTURE_RGB_ARB;
461	}
462	}
463	#else // _WIN32
464	#if defined(DEBUG) \|\| defined(_DEBUG)
465	printf("RenderTexture Error: Render-to-Texture not supported in Linux\n");
466	#endif
467	#endif // _WIN32
468	}
469	}
470	else
471	{
472	if (!_bRectangle)
473	{
474	_iTextureTarget = GL_TEXTURE_2D;
475	glBindTexture(_iTextureTarget, _iTextureID);
476
477	// We'll use clamp to edge as the default texture wrap mode for all tex types
478	glTexParameteri( _iTextureTarget, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
479	glTexParameteri( _iTextureTarget, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
480	glTexParameteri( _iTextureTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
481
482	if (bMipmap)
483	{
484	_bMipmap = true;
485	glTexParameteri( _iTextureTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
486
487	// Generate mipmap automatically if supported
488	if (GLEW_SGIS_generate_mipmap)
489	{
490	glTexParameteri( _iTextureTarget, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
491	}
492	else
493	{
494	PrintExtensionError("GL_SGIS_generate_mipmap");
495	}
496	}
497	else
498	{
499	glTexParameteri( _iTextureTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
500	}
501
502	// Set anisotropic filter to the max ratio
503	if (bAnisoFilter)
504	{
505	if (GLEW_EXT_texture_filter_anisotropic)
506	{
507	_bAnisoFilter = true;
508	float rMaxAniso;
509	glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &rMaxAniso);
510	glTexParameterf( _iTextureTarget, GL_TEXTURE_MAX_ANISOTROPY_EXT, rMaxAniso);
511	}
512	}
513
514	if (RT_COPY_TO_TEXTURE == _eUpdateMode)
515	{
516	GLuint iInternalFormat;
517	GLuint iFormat;
518	if (iABits > 0)
519	{
520	iInternalFormat = GL_RGBA8;
521	iFormat = GL_RGBA;
522	}
523	else
524	{
525	iInternalFormat = GL_RGB8;
526	iFormat = GL_RGB;
527	}
528	// Allocate the texture image (but pass it no data for now).
529	glTexImage2D(_iTextureTarget, 0, iInternalFormat, _iWidth, _iHeight,
530	0, iFormat, GL_FLOAT, NULL);
531	}
532	else
533	{
534	#ifdef _WIN32
535	iWGLTextureTarget = WGL_TEXTURE_2D_ARB;
536	if (iABits > 0)
537	{
538	iBindTarget = WGL_BIND_TO_TEXTURE_RGBA_ARB;
539	iTextureFormat = WGL_TEXTURE_RGBA_ARB;
540	}
541	else
542	{
543	iBindTarget = WGL_BIND_TO_TEXTURE_RGB_ARB;
544	iTextureFormat = WGL_TEXTURE_RGB_ARB;
545	}
546	#endif
547	}
548	}
549	else
550	{
551	if (!bNVIDIA)
552	{
553	fprintf(stderr,
554	"RenderTexture Error: ATI textures must be power-of-two-dimensioned.\n");
555	return false;
556	}
557
558	_iTextureTarget = GL_TEXTURE_RECTANGLE_NV;
559
560	glBindTexture(_iTextureTarget, _iTextureID);
561
562	glTexParameteri( _iTextureTarget, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
563	glTexParameteri( _iTextureTarget, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
564	glTexParameteri( _iTextureTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
565	glTexParameteri( _iTextureTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
566
567	if (bMipmap)
568	{
569
570	fprintf(stderr,
571	"RenderTexture Error: rectangle textures do not support mipmaps\n");
572	return false;
573	}
574
575	if (RT_COPY_TO_TEXTURE == _eUpdateMode)
576	{
577	GLuint iInternalFormat;
578	GLuint iFormat;
579	if (iABits > 0)
580	{
581	iInternalFormat = GL_RGBA8;
582	iFormat = GL_RGBA;
583	}
584	else
585	{
586	iInternalFormat = GL_RGB8;
587	iFormat = GL_RGB;
588	}
589	// Allocate the texture image (but pass it no data for now).
590	glTexImage2D(_iTextureTarget, 0, iInternalFormat, _iWidth, _iHeight,
591	0, iFormat, GL_FLOAT, NULL);
592	}
593	else
594	{
595	#ifdef _WIN32
596	iWGLTextureTarget = WGL_TEXTURE_RECTANGLE_NV;
597	if (iABits > 0)
598	{
599	iBindTarget = WGL_BIND_TO_TEXTURE_RECTANGLE_RGBA_NV;
600	iTextureFormat = WGL_TEXTURE_RGBA_ARB;
601	}
602	else
603	{
604	iBindTarget = WGL_BIND_TO_TEXTURE_RECTANGLE_RGB_NV;
605	iTextureFormat= WGL_TEXTURE_RGB_ARB;
606	}
607	#endif
608	}
609	}
610	}
611	}
612
613	if (_bIsDepthTexture)
614	{
615	if (!bNVIDIA && _bRectangle)
616	{
617	fprintf(stderr,
618	"RenderTexture Error: ATI textures must be power-of-two-dimensioned.\n");
619	return false;
620	}
621
622	if (!_iTextureTarget)
623	_iTextureTarget = _bRectangle ? GL_TEXTURE_RECTANGLE_NV : GL_TEXTURE_2D;
624
625	glBindTexture(_iTextureTarget, _iDepthTextureID);
626
627	// We'll use clamp to edge as the default texture wrap mode for all tex types
628	glTexParameteri( _iTextureTarget, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
629	glTexParameteri( _iTextureTarget, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
630	glTexParameteri( _iTextureTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
631	glTexParameteri( _iTextureTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
632
633	// user will need to set up hardware shadow mapping himself (using ARB_shadow)
634
635	if (RT_COPY_TO_TEXTURE == _eUpdateMode)
636	{
637	// [Redge]
638	if (_bHasArbDepthTexture)
639	{
640	// Allocate the texture image (but pass it no data for now).
641	glTexImage2D(_iTextureTarget, 0, GL_DEPTH_COMPONENT, _iWidth, _iHeight,
642	0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
643	}
644	else
645	{
646	// allocate memory for depth texture
647	// Since this is slow, we warn the user in debug mode. (above)
648	_pPoorDepthTexture = new unsigned short[_iWidth * _iHeight];
649	glTexImage2D(_iTextureTarget, 0, GL_LUMINANCE16, _iWidth, _iHeight,
650	0, GL_LUMINANCE, GL_UNSIGNED_SHORT, _pPoorDepthTexture);
651	}
652	// [/Redge]
653	}
654	else // RENDER_TO_TEXTURE
655	{
656	#ifdef _WIN32
657	if(_bRectangle)
658	{
659	if (!iWGLTextureTarget) iWGLTextureTarget = WGL_TEXTURE_RECTANGLE_NV;
660	iDepthBindTarget = WGL_BIND_TO_TEXTURE_RECTANGLE_DEPTH_NV;
661	iDepthTextureFormat = WGL_TEXTURE_DEPTH_COMPONENT_NV;
662	}
663	else
664	{
665	if (!iWGLTextureTarget) iWGLTextureTarget = WGL_TEXTURE_2D_ARB;
666	iDepthBindTarget = WGL_BIND_TO_TEXTURE_DEPTH_NV;
667	iDepthTextureFormat = WGL_TEXTURE_DEPTH_COMPONENT_NV;
668	}
669	#endif
670	}
671	}
672
673	#if _WIN32
674	// Get the current context.
675	HDC hdc = wglGetCurrentDC();
676	if (NULL == hdc)
677	_wglGetLastError();
678	HGLRC hglrc = wglGetCurrentContext();
679	if (NULL == hglrc)
680	_wglGetLastError();
681
682	int iFormat = 0;
683	unsigned int iNumFormats;
684	int attribChooseList[50];
685	int attribCreateList[50];
686	int attribChoose = 0;
687	int attribCreate = 0;
688
689	// Setup the attrib list for wglChoosePixelFormat()
690
691	attribChooseList[attribChoose++] = WGL_RED_BITS_ARB;
692	attribChooseList[attribChoose++] = iRBits;
693	attribChooseList[attribChoose++] = WGL_GREEN_BITS_ARB;
694	attribChooseList[attribChoose++] = iGBits;
695	attribChooseList[attribChoose++] = WGL_BLUE_BITS_ARB;
696	attribChooseList[attribChoose++] = iBBits;
697	attribChooseList[attribChoose++] = WGL_ALPHA_BITS_ARB;
698	attribChooseList[attribChoose++] = iABits;
699	if (_bFloat)
700	{
701	if (bNVIDIA)
702	{
703	attribChooseList[attribChoose++] = WGL_FLOAT_COMPONENTS_NV;
704	attribChooseList[attribChoose++] = GL_TRUE;
705	}
706	else
707	{
708	attribChooseList[attribChoose++] = WGL_PIXEL_TYPE_ARB;
709	attribChooseList[attribChoose++] = WGL_TYPE_RGBA_FLOAT_ATI;
710	}
711	}
712
713	attribChooseList[attribChoose++] = WGL_STENCIL_BITS_ARB;
714	attribChooseList[attribChoose++] = (bStencil) ? 8 : 0;
715	attribChooseList[attribChoose++] = WGL_DEPTH_BITS_ARB;
716	attribChooseList[attribChoose++] = (bDepth) ? 24 : 0;
717	attribChooseList[attribChoose++] = WGL_DRAW_TO_PBUFFER_ARB;
718	attribChooseList[attribChoose++] = GL_TRUE;
719
720	if (_bIsTexture && RT_RENDER_TO_TEXTURE == _eUpdateMode)
721	{
722	attribChooseList[attribChoose++] = iBindTarget;
723	attribChooseList[attribChoose++] = GL_TRUE;
724	}
725	if (_bIsDepthTexture && RT_RENDER_TO_TEXTURE == _eUpdateMode)
726	{
727	attribChooseList[attribChoose++] = iDepthBindTarget;
728	attribChooseList[attribChoose++] = GL_TRUE;
729	}
730
731	attribChooseList[attribChoose++] = 0;
732
733	// Setup the attrib list for wglCreatePbuffer()
734	if ((_bIsTexture \|\| _bIsDepthTexture) && RT_RENDER_TO_TEXTURE == _eUpdateMode)
735	{
736	attribCreateList[attribCreate++] = WGL_TEXTURE_TARGET_ARB;
737	attribCreateList[attribCreate++] = iWGLTextureTarget;
738	}
739	if (_bIsTexture && RT_RENDER_TO_TEXTURE == _eUpdateMode)
740	{
741	attribCreateList[attribCreate++] = WGL_TEXTURE_FORMAT_ARB;
742	attribCreateList[attribCreate++] = iTextureFormat;
743	/*attribCreateList[attribCreate++] = WGL_TEXTURE_TARGET_ARB;
744	attribCreateList[attribCreate++] = iWGLTextureTarget;*/
745	attribCreateList[attribCreate++] = WGL_MIPMAP_TEXTURE_ARB;
746	attribCreateList[attribCreate++] = (bMipmap) ? GL_TRUE : GL_FALSE;
747	}
748	if (_bIsDepthTexture && RT_RENDER_TO_TEXTURE == _eUpdateMode)
749	{
750	attribCreateList[attribCreate++] = WGL_DEPTH_TEXTURE_FORMAT_NV;
751	attribCreateList[attribCreate++] = iDepthTextureFormat;
752	}
753	attribCreateList[attribCreate++] = WGL_PBUFFER_LARGEST_ARB;
754	attribCreateList[attribCreate++] = GL_FALSE;
755	attribCreateList[attribCreate++] = 0;
756
757	if (!wglChoosePixelFormatARB( hdc, attribChooseList, NULL, 1, &iFormat, &iNumFormats))
758	{
759	fprintf(stderr,
760	"RenderTexture::Initialize() creation error: wglChoosePixelFormatARB() failed.\n");
761	_wglGetLastError();
762	return false;
763	}
764	if ( iNumFormats <= 0 )
765	{
766	fprintf(stderr,
767	"RenderTexture::Initialize() creation error: Couldn't find a suitable pixel format.\n");
768	_wglGetLastError();
769	return false;
770	}
771
772	// Create the p-buffer.
773	_hPBuffer = wglCreatePbufferARB( hdc, iFormat, _iWidth, _iHeight, attribCreateList );
774	if (!_hPBuffer)
775	{
776	fprintf(stderr, "RenderTexture::Initialize() pbuffer creation error: wglCreatePbufferARB() failed\n");
777	_wglGetLastError();
778	return false;
779	}
780
781	// Get the device context.
782	_hDC = wglGetPbufferDCARB( _hPBuffer);
783	if ( !_hDC )
784	{
785	fprintf(stderr,
786	"RenderTexture::Initialize() creation error: wglGetGetPbufferDCARB() failed\n");
787	_wglGetLastError();
788	return false;
789	}
790
791	// Create a gl context for the p-buffer.
792
793
794	_hGLContext = wglCreateContext( _hDC );
795	if ( !_hGLContext )
796	{
797	fprintf(stderr, "RenderTexture::Initialize() creation error: wglCreateContext() failed\n");
798	_wglGetLastError();
799	return false;
800	}
801
802	// Share lists, texture objects, and program objects.
803	if( bShare )
804	{
805	if( !wglShareLists(hglrc, _hGLContext) )
806	{
807	fprintf(stderr, "RenderTexture::Initialize() creation error: wglShareLists() failed\n" );
808	_wglGetLastError();
809	return false;
810	}
811	}
812
813	// bind the pbuffer to the render texture object
814	if (_bIsTexture && RT_RENDER_TO_TEXTURE == _eUpdateMode)
815	{
816	glBindTexture(_iTextureTarget, _iTextureID);
817	if (wglBindTexImageARB(_hPBuffer, WGL_FRONT_LEFT_ARB) == FALSE)
818	{
819	_wglGetLastError();
820	return false;
821	}
822	}
823	if (_bIsDepthTexture && RT_RENDER_TO_TEXTURE == _eUpdateMode)
824	{
825	glBindTexture(_iTextureTarget, _iDepthTextureID);
826	if (wglBindTexImageARB(_hPBuffer, WGL_DEPTH_COMPONENT_NV) == FALSE)
827	{
828	_wglGetLastError();
829	return false;
830	}
831	}
832
833	// Determine the actual width and height we were able to create.
834	wglQueryPbufferARB( _hPBuffer, WGL_PBUFFER_WIDTH_ARB, &_iWidth );
835	wglQueryPbufferARB( _hPBuffer, WGL_PBUFFER_HEIGHT_ARB, &_iHeight );
836
837	_bInitialized = true;
838
839	// get the actual number of bits allocated:
840	int attrib = WGL_RED_BITS_ARB;
841	int value;
842	_iBits[0] = (wglGetPixelFormatAttribivARB(_hDC, iFormat, 0, 1, &attrib, &value)) ? value : iRBits;
843	attrib = WGL_GREEN_BITS_ARB;
844	_iBits[1] = (wglGetPixelFormatAttribivARB(_hDC, iFormat, 0, 1, &attrib, &value)) ? value : iGBits;
845	attrib = WGL_BLUE_BITS_ARB;
846	_iBits[2] = (wglGetPixelFormatAttribivARB(_hDC, iFormat, 0, 1, &attrib, &value)) ? value : iBBits;
847	attrib = WGL_ALPHA_BITS_ARB;
848	_iBits[3] = (wglGetPixelFormatAttribivARB(_hDC, iFormat, 0, 1, &attrib, &value)) ? value : iABits;
849	attrib = WGL_DEPTH_BITS_ARB;
850	_iBits[4] = (wglGetPixelFormatAttribivARB(_hDC, iFormat, 0, 1, &attrib, &value)) ? value : 0;
851	attrib = WGL_STENCIL_BITS_ARB;
852	_iBits[5] = (wglGetPixelFormatAttribivARB(_hDC, iFormat, 0, 1, &attrib, &value)) ? value : 0;
853
854	#if defined(_DEBUG) \|\| defined(DEBUG)
855	fprintf(stderr, "Created a %dx%d RenderTexture with BPP(%d, %d, %d, %d)",
856	_iWidth, _iHeight, _iBits[0], _iBits[1], _iBits[2], _iBits[3]);
857	if (_iBits[4]) fprintf(stderr, " depth=%d", _iBits[4]);
858	if (_iBits[5]) fprintf(stderr, " stencil=%d", _iBits[5]);
859	fprintf(stderr, "\n");
860	#endif
861	#else // _WIN32
862	_pDpy = glXGetCurrentDisplay();
863	GLXContext context = glXGetCurrentContext();
864	int screen = DefaultScreen(_pDpy);
865	XVisualInfo *visInfo;
866
867	int iFormat = 0;
868	int iNumFormats;
869	int fbAttribs[50];
870	int attrib = 0;
871
872	fbAttribs[attrib++] = GLX_RENDER_TYPE_SGIX;
873	fbAttribs[attrib++] = GLX_RGBA_BIT_SGIX;
874	fbAttribs[attrib++] = GLX_DRAWABLE_TYPE_SGIX;
875	fbAttribs[attrib++] = GLX_PBUFFER_BIT_SGIX;
876	fbAttribs[attrib++] = GLX_STENCIL_SIZE;
877	fbAttribs[attrib++] = (bStencil) ? 8 : 0;
878	fbAttribs[attrib++] = GLX_DEPTH_SIZE;
879	fbAttribs[attrib++] = (bDepth) ? 24 : 0;
880	if (_bFloat)
881	{
882	fbAttribs[attrib++] = GLX_RED_SIZE;
883	fbAttribs[attrib++] = iRBits;
884	fbAttribs[attrib++] = GLX_GREEN_SIZE;
885	fbAttribs[attrib++] = iGBits;
886	fbAttribs[attrib++] = GLX_BLUE_SIZE;
887	fbAttribs[attrib++] = iBBits;
888	fbAttribs[attrib++] = GLX_ALPHA_SIZE;
889	fbAttribs[attrib++] = iABits;
890	fbAttribs[attrib++] = GLX_FLOAT_COMPONENTS_NV;
891	fbAttribs[attrib++] = 1;
892	}
893	fbAttribs[attrib++] = None;
894
895	GLXFBConfigSGIX *fbConfigs;
896	int nConfigs;
897
898	fbConfigs = glXChooseFBConfigSGIX(_pDpy, screen, fbAttribs, &nConfigs);
899
900	if (nConfigs == 0 \|\| !fbConfigs) {
901	fprintf(stderr,
902	"RenderTexture::Initialize() creation error: Couldn't find a suitable pixel format\n");
903	return false;
904	}
905
906	// Pick the first returned format that will return a pbuffer
907	for (int i=0;i<nConfigs;i++)
908	{
909	_hPBuffer = glXCreateGLXPbufferSGIX(_pDpy, fbConfigs[i], _iWidth, _iHeight, NULL);
910	if (_hPBuffer) {
911	_hGLContext = glXCreateContextWithConfigSGIX(_pDpy, fbConfigs[i], GLX_RGBA_TYPE, bShare?context:NULL, True);
912	break;
913	}
914	}
915
916	if (!_hPBuffer)
917	{
918	fprintf(stderr, "RenderTexture::Initialize() pbuffer creation error: glXCreateGLXPbufferSGIX() failed\n");
919	return false;
920	}
921
922	if(!_hGLContext)
923	{
924	// Try indirect
925	_hGLContext = glXCreateContext(_pDpy, visInfo, bShare?context:NULL, False);
926	if ( !_hGLContext )
927	{
928	fprintf(stderr, "RenderTexture::Initialize() creation error: glXCreateContext() failed\n");
929	return false;
930	}
931	}
932
933	glXQueryGLXPbufferSGIX(_pDpy, _hPBuffer, GLX_WIDTH_SGIX, (GLuint*)&_iWidth);
934	glXQueryGLXPbufferSGIX(_pDpy, _hPBuffer, GLX_HEIGHT_SGIX, (GLuint*)&_iHeight);
935
936	_bInitialized = true;
937
938	// XXX Query the color format
939
940	#endif // _WIN32
941
942	return true;
943	}
944
945	//------------------------------------------------------------------------------
946	// Function : RenderTexture::_Invalidate
947	// Description :
948	//------------------------------------------------------------------------------
949	/**
950	* @fn RenderTexture::_Invalidate()
951	* @brief Returns the pbuffer memory to the graphics device.
952	*
953	*/
954	bool RenderTexture::_Invalidate()
955	{
956	_bFloat = false;
957	_bRectangle = false;
958	_bInitialized = false;
959	_bHasDepth = false;
960	_bHasStencil = false;
961	_bMipmap = false;
962	_bAnisoFilter = false;
963	_iBits[0] = _iBits[1] = _iBits[2] = _iBits[3] = 0;
964
965	if (_bIsTexture)
966	glDeleteTextures(1, &_iTextureID);
967	if (_bIsDepthTexture) {
968	// [Redge]
969	if (!_bHasArbDepthTexture) delete[] _pPoorDepthTexture;
970	// [/Redge]
971	glDeleteTextures(1, &_iDepthTextureID);
972	}
973
974	#if _WIN32
975	if ( _hPBuffer )
976	{
977	// Check if we are currently rendering in the pbuffer
978	if (wglGetCurrentContext() == _hGLContext)
979	wglMakeCurrent(0,0);
980	wglDeleteContext( _hGLContext);
981	wglReleasePbufferDCARB( _hPBuffer, _hDC);
982	wglDestroyPbufferARB( _hPBuffer );
983	_hPBuffer = 0;
984	return true;
985	}
986	#else // _WIN32
987	if ( _hPBuffer )
988	{
989	if(glXGetCurrentContext() == _hGLContext)
990	// XXX I don't know if this is right at all
991	glXMakeCurrent(_pDpy, _hPBuffer, 0);
992	glXDestroyGLXPbufferSGIX(_pDpy, _hPBuffer);
993	_hPBuffer = 0;
994	return true;
995	}
996	#endif // _WIN32
997	return false;
998	}
999
1000
1001	//------------------------------------------------------------------------------
1002	// Function : RenderTexture::Reset
1003	// Description :
1004	//------------------------------------------------------------------------------
1005	/**
1006	* @fn RenderTexture::Reset(int iWidth, int iHeight, unsigned int iMode, bool bIsTexture, bool bIsDepthTexture)
1007	* @brief Resets the resolution of the offscreen buffer.
1008	*
1009	* Causes the buffer to delete itself. User must call Initialize() again
1010	* before use.
1011	*/
1012	bool RenderTexture::Reset(int iWidth, int iHeight, bool bIsTexture /* = true */,
1013	bool bIsDepthTexture /* = false */)
1014	{
1015	if (!_Invalidate())
1016	{
1017	fprintf(stderr, "RenderTexture::Reset(): failed to invalidate.\n");
1018	return false;
1019	}
1020	_iWidth = iWidth;
1021	_iHeight = iHeight;
1022	_bIsTexture = bIsTexture;
1023	_bIsDepthTexture = bIsDepthTexture;
1024
1025	return true;
1026	}
1027
1028
1029	//------------------------------------------------------------------------------
1030	// Function : RenderTexture::BeginCapture
1031	// Description :
1032	//------------------------------------------------------------------------------
1033	/**
1034	* @fn RenderTexture::BeginCapture()
1035	* @brief Activates rendering to the RenderTexture.
1036	*/
1037	bool RenderTexture::BeginCapture()
1038	{
1039	if (!_bInitialized)
1040	{
1041	fprintf(stderr, "RenderTexture::BeginCapture(): Texture is not initialized!\n");
1042	exit(1);
1043	return false;
1044	}
1045	#ifdef _WIN32
1046	// cache the current context so we can reset it when EndCapture() is called.
1047	_hPreviousDC = wglGetCurrentDC();
1048	if (NULL == _hPreviousDC)
1049	_wglGetLastError();
1050	_hPreviousContext = wglGetCurrentContext();
1051	if (NULL == _hPreviousContext)
1052	_wglGetLastError();
1053
1054	if (_bIsTexture && RT_RENDER_TO_TEXTURE == _eUpdateMode)
1055	{
1056	glBindTexture(_iTextureTarget, _iTextureID);
1057
1058	// release the pbuffer from the render texture object
1059	if (FALSE == wglReleaseTexImageARB(_hPBuffer, WGL_FRONT_LEFT_ARB))
1060	{
1061	_wglGetLastError();
1062	return false;
1063	}
1064	}
1065
1066	if (_bIsDepthTexture && RT_RENDER_TO_TEXTURE == _eUpdateMode)
1067	{
1068	glBindTexture(_iTextureTarget, _iDepthTextureID);
1069
1070	// release the pbuffer from the render texture object
1071	if (FALSE == wglReleaseTexImageARB(_hPBuffer, WGL_DEPTH_COMPONENT_NV))
1072	{
1073	_wglGetLastError();
1074	return false;
1075	}
1076	}
1077
1078	// make the pbuffer's rendering context current.
1079	if (FALSE == wglMakeCurrent( _hDC, _hGLContext))
1080	{
1081	_wglGetLastError();
1082	return false;
1083	}
1084	#else // _WIN32
1085	_hPreviousContext = glXGetCurrentContext();
1086	_hPreviousDrawable = glXGetCurrentDrawable();
1087
1088	if (False == glXMakeCurrent(_pDpy, _hPBuffer, _hGLContext)) {
1089	return false;
1090	}
1091	#endif // _WIN32
1092
1093	return true;
1094	}
1095
1096
1097	//------------------------------------------------------------------------------
1098	// Function : RenderTexture::EndCapture
1099	// Description :
1100	//------------------------------------------------------------------------------
1101	/**
1102	* @fn RenderTexture::EndCapture()
1103	* @brief Ends rendering to the RenderTexture.
1104	*/
1105	bool RenderTexture::EndCapture()
1106	{
1107	bool bContextReset = false;
1108
1109	if (!_bInitialized)
1110	{
1111	fprintf(stderr, "RenderTexture::EndCapture(): Texture is not initialized!\n");
1112	return false;
1113	}
1114	#ifdef _WIN32
1115	if (_bIsTexture)
1116	{
1117	if (RT_RENDER_TO_TEXTURE == _eUpdateMode)
1118	{
1119	// make the previous rendering context current
1120	if (FALSE == wglMakeCurrent( _hPreviousDC, _hPreviousContext))
1121	{
1122	_wglGetLastError();
1123	return false;
1124	}
1125	bContextReset = true;
1126
1127	// [Redge] moved binding completely to Bind()
1128	// [Mark] Can't do that, because it makes things difficult for Cg users.
1129	// bind the pbuffer to the render texture object
1130	glBindTexture(_iTextureTarget, _iTextureID);
1131	if (FALSE == wglBindTexImageARB(_hPBuffer, WGL_FRONT_LEFT_ARB))
1132	{
1133	_wglGetLastError();
1134	return false;
1135	}
1136	}
1137	else
1138	{
1139	glBindTexture(_iTextureTarget, _iTextureID);
1140	glCopyTexSubImage2D(_iTextureTarget, 0, 0, 0, 0, 0, _iWidth, _iHeight);
1141	}
1142	}
1143	if (_bIsDepthTexture)
1144	{
1145	if (RT_RENDER_TO_TEXTURE == _eUpdateMode)
1146	{
1147	// make the previous rendering context current
1148	if(!bContextReset)
1149	{
1150	if (FALSE == wglMakeCurrent( _hPreviousDC, _hPreviousContext))
1151	{
1152	_wglGetLastError();
1153	return false;
1154	}
1155	bContextReset = true;
1156	}
1157
1158	// [Redge] moved binding completely to Bind()
1159	// [Mark] Can't do that, because it makes things difficult for Cg users.
1160	// bind the pbuffer to the render texture object
1161	glBindTexture(_iTextureTarget, _iDepthTextureID);
1162	if (FALSE == wglBindTexImageARB(_hPBuffer, WGL_DEPTH_COMPONENT_NV))
1163	{
1164	_wglGetLastError();
1165	return false;
1166	}
1167	}
1168	else
1169	{
1170	glBindTexture(_iTextureTarget, _iDepthTextureID);
1171	// HOW TO COPY DEPTH TEXTURE??? Supposedly this just magically works...
1172	// [Redge]
1173	if (_bHasArbDepthTexture)
1174	{
1175	glCopyTexSubImage2D(_iTextureTarget, 0, 0, 0, 0, 0, _iWidth, _iHeight);
1176	}
1177	else
1178	{
1179	// no 'real' depth texture available, so behavior has to be emulated
1180	// using glReadPixels (beware, this is (naturally) slow ...)
1181	glReadPixels(0, 0, _iWidth, _iHeight,
1182	GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT, _pPoorDepthTexture);
1183	glTexImage2D(_iTextureTarget, 0, GL_LUMINANCE16,
1184	_iWidth, _iHeight,
1185	0, GL_LUMINANCE, GL_UNSIGNED_SHORT, _pPoorDepthTexture);
1186	}
1187	// [/Redge]
1188	}
1189	}
1190
1191	if(!bContextReset)
1192	{
1193	// make the previous rendering context current
1194	if (FALSE == wglMakeCurrent( _hPreviousDC, _hPreviousContext))
1195	{
1196	_wglGetLastError();
1197	return false;
1198	}
1199	}
1200	#else // _WIN32
1201	assert(_bIsTexture);
1202	glBindTexture(_iTextureTarget, _iTextureID);
1203	glCopyTexSubImage2D(_iTextureTarget, 0, 0, 0, 0, 0, _iWidth, _iHeight);
1204
1205	if(!bContextReset)
1206	{
1207	if (False == glXMakeCurrent(_pDpy, _hPreviousDrawable, _hPreviousContext))
1208	{
1209	return false;
1210	}
1211	}
1212	#endif // _WIN32
1213	return true;
1214	}
1215
1216
1217
1218	//------------------------------------------------------------------------------
1219	// Function : RenderTexture::Bind
1220	// Description :
1221	//------------------------------------------------------------------------------
1222	/**
1223	* @fn RenderTexture::Bind()
1224	* @brief Binds RGB texture.
1225	*/
1226	void RenderTexture::Bind() const
1227	{
1228	if (_bInitialized) {
1229	glBindTexture(_iTextureTarget, _iTextureID);
1230	}
1231	}
1232
1233
1234	//------------------------------------------------------------------------------
1235	// Function : RenderTexture::BindDepth
1236	// Description :
1237	//------------------------------------------------------------------------------
1238	/**
1239	* @fn RenderTexture::BindDepth()
1240	* @brief Binds depth texture.
1241	*/
1242	void RenderTexture::BindDepth() const
1243	{
1244	if (_bInitialized && _bIsDepthTexture) {
1245	glBindTexture(_iTextureTarget, _iDepthTextureID);
1246	}
1247	}

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