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source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.cpp @ 2881

Revision 2881, 25.2 KB checked in by mattausch, 16 years ago (diff)
working quite well

Line
1	#include "SsaoShader.h"
2	#include "FrameBufferObject.h"
3	#include "RenderState.h"
4	#include "SampleGenerator.h"
5	#include "Vector3.h"
6	#include "Camera.h"
7
8
9	using namespace std;
10
11	static GLenum mymrt[] = {GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT};
12
13	namespace CHCDemoEngine
14	{
15
16	// number of ssao samples
17	#define NUM_SAMPLES 10
18
19
20	static CGprogram sCgSsaoProgram = NULL;
21	static CGprogram sCgGiProgram = NULL;
22
23	static CGprogram sCgDeferredProgram = NULL;
24	static CGprogram sCgAntiAliasingProgram = NULL;
25
26	static CGparameter sColorsTexCombineParam;
27	static CGparameter sSsaoTexCombineParam;
28
29	static CGparameter sColorsTexDeferredParam;
30	static CGparameter sPositionsTexDeferredParam;
31	static CGparameter sNormalsTexDeferredParam;
32
33
34	static CGprogram sCgCombinedSsaoProgram = NULL;
35	static CGprogram sCgCombinedIllumProgram = NULL;
36
37	///////////////////////////////////////7
38
39
40	static CGparameter sColorsTexParam;
41	static CGparameter sPositionsTexParam;
42	static CGparameter sNormalsTexParam;
43
44	static CGparameter sOldModelViewProjMatrixParam;
45	static CGparameter sMaxDepthParam;
46	static CGparameter sSamplesParam;
47	static CGparameter sOldTexParam;
48	static CGparameter sNoiseTexParam;
49	static CGparameter sNoiseMultiplierParam;
50	static CGparameter sExpFactorParam;
51
52
53	///////////////////////////////////////
54
55
56	static CGparameter sColorsTexGiParam;
57	static CGparameter sPositionsTexGiParam;
58	static CGparameter sNormalsTexGiParam;
59
60
61	static CGparameter sOldModelViewProjMatrixGiParam;
62	static CGparameter sMaxDepthGiParam;
63	static CGparameter sSamplesGiParam;
64	static CGparameter sOldSsaoTexGiParam;
65	static CGparameter sOldIllumTexGiParam;
66	static CGparameter sNoiseTexGiParam;
67	static CGparameter sNoiseMultiplierGiParam;
68	static CGparameter sExpFactorGiParam;
69
70
71	static CGparameter sColorsTexCombinedIllumParam;
72	static CGparameter sSsaoTexCombinedIllumParam;
73	static CGparameter sIllumTexCombinedIllumParam;
74
75	static CGparameter sColorsTexCombinedSsaoParam;
76	static CGparameter sSsaoTexCombinedSsaoParam;
77
78
79	////////////
80
81	static CGparameter sColorsTexAntiAliasingParam;
82	static CGparameter sNormalsTexAntiAliasingParam;
83
84	static GLuint noiseTex = 0;
85
86	// ssao random spherical samples
87	static Sample2 samples[NUM_SAMPLES];
88
89
90	static void PrintGLerror(char *msg)
91	{
92	GLenum errCode;
93	const GLubyte *errStr;
94
95	if ((errCode = glGetError()) != GL_NO_ERROR)
96	{
97	errStr = gluErrorString(errCode);
98	fprintf(stderr,"OpenGL ERROR: %s: %s\n", errStr, msg);
99	}
100	}
101
102
103	/** Generate poisson disc distributed sample points on the unit disc
104	*/
105	static void GenerateSamples()
106	{
107	static PoissonDiscSampleGenerator poisson(NUM_SAMPLES, 1.0f);
108	poisson.Generate((Sample2 *)samples);
109	}
110
111
112	static void CreateNoiseTex2D(int w, int h)
113	{
114	//GLubyte randomNormals = new GLubyte[mWidth mHeight * 3];
115	float randomNormals = new float[w h * 3];
116
117	for (int i = 0; i < w * h * 3; i += 3)
118	{
119	// create random samples on a circle
120	const float rx = RandomValue(0, 1);
121	const float theta = 2.0f * acos(sqrt(1.0f - rx));
122
123	//randomNormals[i + 0] = (GLubyte)((cos(theta) * 0.5f + 0.5f) * 255.0f);
124	//randomNormals[i + 1] = (GLubyte)((sin(theta) * 0.5f + 0.5f) * 255.0f);
125	randomNormals[i + 0] = cos(theta);
126	randomNormals[i + 1] = sin(theta);
127	randomNormals[i + 2] = 0;
128	}
129
130	glEnable(GL_TEXTURE_2D);
131	glGenTextures(1, &noiseTex);
132	glBindTexture(GL_TEXTURE_2D, noiseTex);
133
134	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
135	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
136	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
137	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
138
139	//glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, mWidth, mHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, randomNormals);
140	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, w, h, 0, GL_RGB, GL_FLOAT, randomNormals);
141
142	glBindTexture(GL_TEXTURE_2D, 0);
143	glDisable(GL_TEXTURE_2D);
144
145	delete [] randomNormals;
146
147	cout << "created noise texture" << endl;
148
149	PrintGLerror("noisetexture");
150	}
151
152
153	SsaoShader::SsaoShader(int w, int h, Camera *cam, float scaleFactor):
154	mWidth(w), mHeight(h),
155	mCamera(cam),
156	mScaleFactor(scaleFactor),
157	mUseTemporalCoherence(true),
158	mUseGlobIllum(false)
159	{
160	// create noise texture for ssao
161	CreateNoiseTex2D(w, h);
162
163	///////////
164	//-- the flip-flop fbos
165
166	//w = 512; h = 512;
167	mNewFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
168
169	mNewFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
170	mNewFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
171
172
173	///////////////////////
174
175	mOldFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
176
177	mOldFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
178	mOldFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
179
180	//mFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
181	//mFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);*/
182	}
183
184
185	SsaoShader::~SsaoShader()
186
187	{
188	if (sCgSsaoProgram) cgDestroyProgram(sCgSsaoProgram);
189	if (sCgDeferredProgram) cgDestroyProgram(sCgDeferredProgram);
190	if (sCgSsaoProgram) cgDestroyProgram(sCgSsaoProgram);
191	if (sCgGiProgram) cgDestroyProgram(sCgGiProgram);
192	if (sCgAntiAliasingProgram) cgDestroyProgram(sCgAntiAliasingProgram);
193
194	DEL_PTR(mNewFbo);
195	DEL_PTR(mOldFbo);
196	//DEL_PTR(mFbo);
197
198	glDeleteTextures(1, &noiseTex);
199	}
200
201
202	void SsaoShader::SetUseGlobIllum(bool useGlobIllum)
203	{
204	mUseGlobIllum = useGlobIllum;
205	}
206
207
208	void SsaoShader::SetUseTemporalCoherence(bool temporal)
209	{
210	mUseTemporalCoherence = temporal;
211	}
212
213
214	void SsaoShader::Init(CGcontext context)
215	{
216	sCgDeferredProgram =
217	cgCreateProgramFromFile(context,
218	CG_SOURCE,
219	"src/shaders/deferred.cg",
220	RenderState::sCgFragmentProfile,
221	"main",
222	NULL);
223
224	if (sCgDeferredProgram != NULL)
225	{
226	cgGLLoadProgram(sCgDeferredProgram);
227
228	// we need size of texture for scaling
229	sPositionsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram, "positions");
230	sColorsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram, "colors");
231	sNormalsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram, "normals");
232	}
233	else
234	cerr << "deferred program failed to load" << endl;
235
236
237	///////////////
238
239	sCgSsaoProgram =
240	cgCreateProgramFromFile(context,
241	CG_SOURCE,
242	"src/shaders/ssao.cg",
243	RenderState::sCgFragmentProfile,
244	"main",
245	NULL);
246
247	if (sCgSsaoProgram != NULL)
248	{
249	cgGLLoadProgram(sCgSsaoProgram);
250
251	// we need size of texture for scaling
252	sPositionsTexParam = cgGetNamedParameter(sCgSsaoProgram, "positions");
253	sColorsTexParam = cgGetNamedParameter(sCgSsaoProgram, "colors");
254	sNormalsTexParam = cgGetNamedParameter(sCgSsaoProgram, "normals");
255	sNoiseTexParam = cgGetNamedParameter(sCgSsaoProgram, "noiseTexture");
256	sNoiseMultiplierParam = cgGetNamedParameter(sCgSsaoProgram, "noiseMultiplier");
257
258	sOldModelViewProjMatrixParam = cgGetNamedParameter(sCgSsaoProgram, "oldModelViewProj");
259	sMaxDepthParam = cgGetNamedParameter(sCgSsaoProgram, "maxDepth");
260	sExpFactorParam = cgGetNamedParameter(sCgSsaoProgram, "expFactor");
261
262	sSamplesParam = cgGetNamedParameter(sCgSsaoProgram, "samples");
263	sOldTexParam = cgGetNamedParameter(sCgSsaoProgram, "oldTex");
264
265
266	// generate samples for ssao kernel
267	GenerateSamples();
268	cgGLSetParameterArray2f(sSamplesParam, 0, NUM_SAMPLES, (const float *)samples);
269
270	cgGLSetParameter1f(sNoiseMultiplierParam, RandomValue(3.0f, 17.0f));
271	}
272	else
273	cerr << "ssao program failed to load" << endl;
274
275	sCgGiProgram =
276	cgCreateProgramFromFile(context,
277	CG_SOURCE,
278	"src/shaders/globillum.cg",
279	RenderState::sCgFragmentProfile,
280	"main",
281	NULL);
282
283	if (sCgGiProgram != NULL)
284	{
285	cgGLLoadProgram(sCgGiProgram);
286
287	// we need size of texture for scaling
288	sPositionsTexGiParam = cgGetNamedParameter(sCgGiProgram, "positions");
289	sColorsTexGiParam = cgGetNamedParameter(sCgGiProgram, "colors");
290	sNormalsTexGiParam = cgGetNamedParameter(sCgGiProgram, "normals");
291	sNoiseTexGiParam = cgGetNamedParameter(sCgGiProgram, "noiseTexture");
292	sNoiseMultiplierGiParam = cgGetNamedParameter(sCgGiProgram, "noiseMultiplier");
293
294	sOldModelViewProjMatrixGiParam = cgGetNamedParameter(sCgGiProgram, "oldModelViewProj");
295	sMaxDepthGiParam = cgGetNamedParameter(sCgGiProgram, "maxDepth");
296	sExpFactorGiParam = cgGetNamedParameter(sCgGiProgram, "expFactor");
297
298	sSamplesGiParam = cgGetNamedParameter(sCgGiProgram, "samples");
299
300	sOldSsaoTexGiParam = cgGetNamedParameter(sCgGiProgram, "oldSsaoTex");
301	sOldIllumTexGiParam = cgGetNamedParameter(sCgGiProgram, "oldIllumTex");
302
303	// generate samples for ssao kernel
304	GenerateSamples();
305	cgGLSetParameterArray2f(sSamplesGiParam, 0, NUM_SAMPLES, (const float *)samples);
306
307	cgGLSetParameter1f(sNoiseMultiplierGiParam, RandomValue(3.0f, 17.0f));
308	}
309	else
310	cerr << "globillum program failed to load" << endl;
311
312	sCgCombinedIllumProgram =
313	cgCreateProgramFromFile(context,
314	CG_SOURCE,
315	"src/shaders/globillum.cg",
316	RenderState::sCgFragmentProfile,
317	"combine",
318	NULL);
319
320	if (sCgCombinedIllumProgram != NULL)
321	{
322	cgGLLoadProgram(sCgCombinedIllumProgram);
323
324	sColorsTexCombinedIllumParam = cgGetNamedParameter(sCgCombinedIllumProgram, "colors");
325	sSsaoTexCombinedIllumParam = cgGetNamedParameter(sCgCombinedIllumProgram, "ssaoTex");
326	sIllumTexCombinedIllumParam = cgGetNamedParameter(sCgCombinedIllumProgram, "illumTex");
327	}
328	else
329	cerr << "combined illum program failed to load" << endl;
330
331
332	sCgCombinedSsaoProgram =
333	cgCreateProgramFromFile(context,
334	CG_SOURCE,
335	"src/shaders/ssao.cg",
336	RenderState::sCgFragmentProfile,
337	"combine",
338	NULL);
339
340	if (sCgCombinedSsaoProgram != NULL)
341	{
342	cgGLLoadProgram(sCgCombinedSsaoProgram);
343
344	sColorsTexCombinedSsaoParam = cgGetNamedParameter(sCgCombinedSsaoProgram, "colors");
345	sSsaoTexCombinedSsaoParam = cgGetNamedParameter(sCgCombinedSsaoProgram, "ssaoTex");
346	}
347	else
348	cerr << "combied illum program failed to load" << endl;
349
350
351	sCgAntiAliasingProgram =
352	cgCreateProgramFromFile(context,
353	CG_SOURCE,
354	"src/shaders/antialiasing.cg",
355	RenderState::sCgFragmentProfile,
356	"main",
357	NULL);
358
359	if (sCgAntiAliasingProgram != NULL)
360	{
361	cgGLLoadProgram(sCgAntiAliasingProgram);
362
363	sColorsTexAntiAliasingParam = cgGetNamedParameter(sCgAntiAliasingProgram, "colors");
364	sNormalsTexAntiAliasingParam = cgGetNamedParameter(sCgAntiAliasingProgram, "normals");
365	}
366	else
367	cerr << "antialiasing program failed to load" << endl;
368
369	PrintGLerror("init");
370	}
371
372
373	void SsaoShader::Render(FrameBufferObject *fbo,
374	const Matrix4x4 &oldProjViewMatrix,
375	float expFactor)
376	{
377
378	// switch roles of old and new fbo
379	// the algorihm uses two input fbos, where the one
380	// contais the color buffer from the last frame,
381	// the other one will be written
382	swap(mNewFbo, mOldFbo);
383
384	FrameBufferObject::Release();
385
386	cgGLEnableProfile(RenderState::sCgFragmentProfile);
387
388	glDisable(GL_ALPHA_TEST);
389	glDisable(GL_TEXTURE_2D);
390	glDisable(GL_LIGHTING);
391
392	glPushAttrib(GL_VIEWPORT_BIT);
393	glViewport(0, 0, mWidth, mHeight);
394
395	glMatrixMode(GL_PROJECTION);
396	glPushMatrix();
397	glLoadIdentity();
398
399	glMatrixMode(GL_MODELVIEW);
400	glPushMatrix();
401	glLoadIdentity();
402
403	const float offs = 0.5f;
404	glOrtho(-offs, offs, -offs, offs, 0, 1);
405
406	FirstPass(fbo);
407
408	if (!mUseGlobIllum)
409	{
410	ComputeSsao(fbo, expFactor, oldProjViewMatrix);
411	CombineSsao(fbo);
412	}
413	else
414	{
415	ComputeGlobIllum(fbo, expFactor, oldProjViewMatrix);
416	CombineIllum(fbo);
417	}
418	AntiAliasing(fbo);
419
420	glEnable(GL_LIGHTING);
421	glDisable(GL_TEXTURE_2D);
422
423	glMatrixMode(GL_PROJECTION);
424	glPopMatrix();
425
426	glMatrixMode(GL_MODELVIEW);
427	glPopMatrix();
428
429	glPopAttrib();
430
431	cgGLDisableProfile(RenderState::sCgFragmentProfile);
432	}
433
434
435	void SsaoShader::ComputeSsao(FrameBufferObject *fbo,
436	float expFactor,
437	const Matrix4x4 &oldProjViewMatrix
438	)
439	{
440	cgGLSetMatrixParameterfc(sOldModelViewProjMatrixParam, (const float *)oldProjViewMatrix.x);
441
442	// GLuint colorsTex = mFbo->GetColorBuffer(0)->GetTexture();
443	GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
444	GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
445	GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
446
447	if (1)
448	{
449	// generate mip map levels for position texture
450	glBindTexture(GL_TEXTURE_2D, positionsTex);
451	glGenerateMipmapEXT(GL_TEXTURE_2D);
452	}
453
454
455	// read the second buffer, write to the first buffer
456	mNewFbo->Bind();
457	glDrawBuffers(1, mymrt);
458
459
460	GLuint oldTex = mOldFbo->GetColorBuffer(0)->GetTexture();
461
462	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
463
464	cgGLEnableProfile(RenderState::sCgFragmentProfile);
465	cgGLBindProgram(sCgSsaoProgram);
466
467	cgGLSetTextureParameter(sPositionsTexParam, positionsTex);
468	cgGLEnableTextureParameter(sPositionsTexParam);
469
470	cgGLSetTextureParameter(sColorsTexParam, colorsTex);
471	cgGLEnableTextureParameter(sColorsTexParam);
472
473	cgGLSetTextureParameter(sNormalsTexParam, normalsTex);
474	cgGLEnableTextureParameter(sNormalsTexParam);
475
476	cgGLSetTextureParameter(sNoiseTexParam, noiseTex);
477	cgGLEnableTextureParameter(sNoiseTexParam);
478
479	cgGLSetTextureParameter(sOldTexParam, oldTex);
480	cgGLEnableTextureParameter(sOldTexParam);
481
482	cgGLSetParameter1f(sMaxDepthParam, mScaleFactor);
483
484	if (mUseTemporalCoherence)
485	{
486	cgGLSetParameter1f(sNoiseMultiplierParam, RandomValue(3.0f, 17.0f));
487	cgGLSetParameter1f(sExpFactorParam, expFactor);
488
489
490	// q: should we generate new samples or only rotate the old ones?
491	// in the first case, the sample patterns look nicer, but the kernel
492	// needs longer to converge
493	GenerateSamples();
494	cgGLSetParameterArray2f(sSamplesParam, 0, NUM_SAMPLES, (const float *)samples);
495	}
496	else
497	{
498	cgGLSetParameter1f(sExpFactorParam, 1.0f);
499	}
500
501	Vector3 tl, tr, bl, br;
502	ComputeViewVectors(tl, tr, bl, br);
503
504	glColor3f(1.0f, 1.0f, 1.0f);
505
506	glBegin(GL_QUADS);
507
508	// note: slightly larger texture hides ambient occlusion error on border but costs resolution
509	//const float new_offs = 0.55f;
510	const float new_offs = 0.5f;
511
512	glColor3f(bl.x, bl.y, bl.z); glTexCoord2f(0, 0); glVertex3f(-new_offs, -new_offs, -0.5f);
513	glColor3f(br.x, br.y, br.z); glTexCoord2f(1, 0); glVertex3f( new_offs, -new_offs, -0.5f);
514	glColor3f(tr.x, tr.y, tr.z); glTexCoord2f(1, 1); glVertex3f( new_offs, new_offs, -0.5f);
515	glColor3f(tl.x, tl.y, tl.z); glTexCoord2f(0, 1); glVertex3f(-new_offs, new_offs, -0.5f);
516
517	glEnd();
518
519	cgGLDisableTextureParameter(sColorsTexParam);
520	cgGLDisableTextureParameter(sPositionsTexParam);
521	cgGLDisableTextureParameter(sNormalsTexParam);
522	cgGLDisableTextureParameter(sNoiseTexParam);
523	cgGLDisableTextureParameter(sOldTexParam);
524
525
526	FrameBufferObject::Release();
527
528	PrintGLerror("ssao first pass");
529	}
530
531
532	void SsaoShader::ComputeViewVectors(Vector3 &tl, Vector3 &tr, Vector3 &bl, Vector3 &br)
533	{
534	Vector3 ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr;
535
536	mCamera->ComputePoints(ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr);
537
538	#if 1 // matT: debug this!!
539
540	bl = -Normalize(nbl - fbl);
541	br = -Normalize(nbr - fbr);
542	tl = -Normalize(ntl - ftl);
543	tr = -Normalize(ntr - ftr);
544
545	#else // just take camera direction
546
547	bl = -Normalize(mCamera->GetDirection());
548	br = -Normalize(mCamera->GetDirection());
549	tl = -Normalize(mCamera->GetDirection());
550	tr = -Normalize(mCamera->GetDirection());
551
552	#endif
553
554	// normalize to 0 .. 1
555	bl = bl * 0.5f + 0.5f;
556	br = br * 0.5f + 0.5f;
557	tl = tl * 0.5f + 0.5f;
558	tr = tr * 0.5f + 0.5f;
559	}
560
561
562
563	static void SetVertex(float x, float y, float x_offs, float y_offs)
564	{
565	glMultiTexCoord2fARB(GL_TEXTURE0_ARB, x, y); // center
566	glMultiTexCoord2fARB(GL_TEXTURE1_ARB, x - x_offs, y + y_offs); // left top
567	glMultiTexCoord2fARB(GL_TEXTURE2_ARB, x + x_offs, y - y_offs); // right bottom
568	glMultiTexCoord2fARB(GL_TEXTURE3_ARB, x + x_offs, y + y_offs); // right top
569	glMultiTexCoord2fARB(GL_TEXTURE4_ARB, x - x_offs, y - y_offs); // left bottom
570
571	glMultiTexCoord4fARB(GL_TEXTURE5_ARB, x - x_offs, y, x + x_offs, y); // left right
572	glMultiTexCoord4fARB(GL_TEXTURE6_ARB, x, y + y_offs, x, y - y_offs); // top bottom
573
574	glVertex3f(x - 0.5f, y - 0.5f, -0.5f);
575	}
576
577
578	void SsaoShader::AntiAliasing(FrameBufferObject *fbo)
579	{
580	//GLuint colorsTex = mNewFbo->GetColorBuffer(1)->GetTexture();
581	GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture();
582	GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
583
584	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
585
586	cgGLEnableProfile(RenderState::sCgFragmentProfile);
587	cgGLBindProgram(sCgAntiAliasingProgram);
588
589	cgGLSetTextureParameter(sColorsTexAntiAliasingParam, colorsTex);
590	cgGLEnableTextureParameter(sColorsTexAntiAliasingParam);
591
592	cgGLSetTextureParameter(sNormalsTexAntiAliasingParam, normalsTex);
593	cgGLEnableTextureParameter(sNormalsTexAntiAliasingParam);
594
595	glColor3f(1.0f, 1.0f, 1.0f);
596
597	float offs2 = 0.5f;
598
599	glBegin(GL_QUADS);
600
601	// the neighbouring texels
602	float x_offs = 1.0f / mWidth;
603	float y_offs = 1.0f / mHeight;
604
605	SetVertex(0, 0, x_offs, y_offs);
606	SetVertex(1, 0, x_offs, y_offs);
607	SetVertex(1, 1, x_offs, y_offs);
608	SetVertex(0, 1, x_offs, y_offs);
609
610	glEnd();
611
612	cgGLDisableTextureParameter(sColorsTexAntiAliasingParam);
613	cgGLDisableTextureParameter(sNormalsTexAntiAliasingParam);
614
615	PrintGLerror("antialiasing");
616	}
617
618
619	void SsaoShader::FirstPass(FrameBufferObject *fbo)
620	{
621	GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture();
622	GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
623	GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
624
625	fbo->Bind();
626
627	glDrawBuffers(1, mymrt + 3);
628
629	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
630
631	cgGLEnableProfile(RenderState::sCgFragmentProfile);
632
633	cgGLBindProgram(sCgDeferredProgram);
634
635	cgGLSetTextureParameter(sColorsTexDeferredParam, colorsTex);
636	cgGLEnableTextureParameter(sColorsTexDeferredParam);
637
638	cgGLSetTextureParameter(sPositionsTexDeferredParam, positionsTex);
639	cgGLEnableTextureParameter(sPositionsTexDeferredParam);
640
641	cgGLSetTextureParameter(sNormalsTexDeferredParam, normalsTex);
642	cgGLEnableTextureParameter(sNormalsTexDeferredParam);
643
644	glColor3f(1.0f, 1.0f, 1.0f);
645
646	const float offs = 0.5f;
647
648	glBegin(GL_QUADS);
649
650	glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f);
651	glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f);
652	glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f);
653	glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f);
654
655	glEnd();
656
657	cgGLDisableTextureParameter(sColorsTexDeferredParam);
658	cgGLDisableTextureParameter(sPositionsTexDeferredParam);
659	cgGLDisableTextureParameter(sNormalsTexDeferredParam);
660
661	cgGLDisableProfile(RenderState::sCgFragmentProfile);
662
663	FrameBufferObject::Release();
664
665	PrintGLerror("deferred shading");
666	}
667
668
669	void SsaoShader::ComputeGlobIllum(FrameBufferObject *fbo,
670	float expFactor,
671	const Matrix4x4 &oldProjViewMatrix
672	)
673	{
674	cgGLSetMatrixParameterfc(sOldModelViewProjMatrixGiParam, (const float *)oldProjViewMatrix.x);
675
676	//GLuint colorsTex = mFbo->GetColorBuffer(0)->GetTexture();
677	GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
678	GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
679	GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
680
681	if (1)
682	{
683	// generate mip map levels for position texture
684	glBindTexture(GL_TEXTURE_2D, positionsTex);
685	glGenerateMipmapEXT(GL_TEXTURE_2D);
686
687	// generate mip map levels for position texture
688	glBindTexture(GL_TEXTURE_2D, colorsTex);
689	glGenerateMipmapEXT(GL_TEXTURE_2D);
690	}
691
692
693	// read the second buffer, write to the first buffer
694	mNewFbo->Bind();
695	glDrawBuffers(2, mymrt);
696
697	GLuint oldSsaoTex = mOldFbo->GetColorBuffer(0)->GetTexture();
698	GLuint oldIllumTex = mOldFbo->GetColorBuffer(1)->GetTexture();
699
700	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
701
702	cgGLEnableProfile(RenderState::sCgFragmentProfile);
703	cgGLBindProgram(sCgGiProgram);
704
705	cgGLSetTextureParameter(sPositionsTexGiParam, positionsTex);
706	cgGLEnableTextureParameter(sPositionsTexGiParam);
707
708	cgGLSetTextureParameter(sColorsTexGiParam, colorsTex);
709	cgGLEnableTextureParameter(sColorsTexGiParam);
710
711	cgGLSetTextureParameter(sNormalsTexGiParam, normalsTex);
712	cgGLEnableTextureParameter(sNormalsTexGiParam);
713
714	cgGLSetTextureParameter(sNoiseTexGiParam, noiseTex);
715	cgGLEnableTextureParameter(sNoiseTexGiParam);
716
717	cgGLSetTextureParameter(sOldSsaoTexGiParam, oldSsaoTex);
718	cgGLEnableTextureParameter(sOldSsaoTexGiParam);
719
720	cgGLSetTextureParameter(sOldIllumTexGiParam, oldIllumTex);
721	cgGLEnableTextureParameter(sOldIllumTexGiParam);
722
723	cgGLSetParameter1f(sMaxDepthGiParam, mScaleFactor);
724
725
726	if (mUseTemporalCoherence)
727	{
728	cgGLSetParameter1f(sNoiseMultiplierGiParam, RandomValue(3.0f, 17.0f));
729	cgGLSetParameter1f(sExpFactorGiParam, expFactor);
730
731
732	// q: should we generate new samples or only rotate the old ones?
733	// in the first case, the sample patterns look nicer, but the kernel
734	// needs longer to converge
735	GenerateSamples();
736	cgGLSetParameterArray2f(sSamplesGiParam, 0, NUM_SAMPLES, (const float *)samples);
737	}
738	else
739	{
740	cgGLSetParameter1f(sExpFactorGiParam, 1.0f);
741	}
742
743	Vector3 tl, tr, bl, br;
744	ComputeViewVectors(tl, tr, bl, br);
745
746	glColor3f(1.0f, 1.0f, 1.0f);
747
748	glBegin(GL_QUADS);
749
750	// note: slightly larger texture hides ambient occlusion error on border but costs resolution
751	//const float new_offs = 0.55f;
752	const float new_offs = 0.5f;
753
754	glColor3f(bl.x, bl.y, bl.z); glTexCoord2f(0, 0); glVertex3f(-new_offs, -new_offs, -0.5f);
755	glColor3f(br.x, br.y, br.z); glTexCoord2f(1, 0); glVertex3f( new_offs, -new_offs, -0.5f);
756	glColor3f(tr.x, tr.y, tr.z); glTexCoord2f(1, 1); glVertex3f( new_offs, new_offs, -0.5f);
757	glColor3f(tl.x, tl.y, tl.z); glTexCoord2f(0, 1); glVertex3f(-new_offs, new_offs, -0.5f);
758
759	glEnd();
760
761	cgGLDisableTextureParameter(sColorsTexGiParam);
762	cgGLDisableTextureParameter(sPositionsTexGiParam);
763	cgGLDisableTextureParameter(sNormalsTexGiParam);
764	cgGLDisableTextureParameter(sNoiseTexGiParam);
765	cgGLDisableTextureParameter(sOldSsaoTexGiParam);
766	cgGLDisableTextureParameter(sOldIllumTexGiParam);
767
768	FrameBufferObject::Release();
769
770	PrintGLerror("globillum first pass");
771	}
772
773
774	void SsaoShader::CombineIllum(FrameBufferObject *fbo)
775	{
776	GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
777	GLuint ssaoTex = mNewFbo->GetColorBuffer(0)->GetTexture();
778	GLuint illumTex = mNewFbo->GetColorBuffer(1)->GetTexture();
779
780	//
781	fbo->Bind();
782
783	// write into old color texture (not needed anymore)
784	glDrawBuffers(1, mymrt);
785
786	cgGLEnableProfile(RenderState::sCgFragmentProfile);
787
788	cgGLBindProgram(sCgCombinedIllumProgram);
789
790	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
791
792
793	cgGLSetTextureParameter(sColorsTexCombinedIllumParam, colorsTex);
794	cgGLEnableTextureParameter(sColorsTexCombinedIllumParam);
795
796	cgGLSetTextureParameter(sSsaoTexCombinedIllumParam, ssaoTex);
797	cgGLEnableTextureParameter(sSsaoTexCombinedIllumParam);
798
799	cgGLSetTextureParameter(sIllumTexCombinedIllumParam, illumTex);
800	cgGLEnableTextureParameter(sIllumTexCombinedIllumParam);
801
802	glColor3f(1.0f, 1.0f, 1.0f);
803
804	const float offs = 0.5f;
805
806	glBegin(GL_QUADS);
807
808	glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f);
809	glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f);
810	glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f);
811	glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f);
812
813	glEnd();
814
815	cgGLDisableTextureParameter(sColorsTexCombinedIllumParam);
816	cgGLDisableTextureParameter(sSsaoTexCombinedIllumParam);
817	cgGLDisableTextureParameter(sIllumTexCombinedIllumParam);
818
819	cgGLDisableProfile(RenderState::sCgFragmentProfile);
820
821	FrameBufferObject::Release();
822
823	PrintGLerror("combine");
824	}
825
826
827	void SsaoShader::CombineSsao(FrameBufferObject *fbo)
828	{
829	GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
830	GLuint ssaoTex = mNewFbo->GetColorBuffer(0)->GetTexture();
831
832	//
833	fbo->Bind();
834
835	// write into old color texture (not needed anymore)
836	glDrawBuffers(1, mymrt);
837
838	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
839
840	cgGLEnableProfile(RenderState::sCgFragmentProfile);
841
842	cgGLBindProgram(sCgCombinedSsaoProgram);
843
844	cgGLSetTextureParameter(sColorsTexCombinedSsaoParam, colorsTex);
845	cgGLEnableTextureParameter(sColorsTexCombinedSsaoParam);
846
847	cgGLSetTextureParameter(sSsaoTexCombinedSsaoParam, ssaoTex);
848	cgGLEnableTextureParameter(sSsaoTexCombinedSsaoParam);
849
850
851	glColor3f(1.0f, 1.0f, 1.0f);
852
853	const float offs = 0.5f;
854
855	glBegin(GL_QUADS);
856
857	glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f);
858	glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f);
859	glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f);
860	glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f);
861
862	glEnd();
863
864	cgGLDisableTextureParameter(sColorsTexCombinedSsaoParam);
865	cgGLDisableTextureParameter(sSsaoTexCombinedSsaoParam);
866
867	cgGLDisableProfile(RenderState::sCgFragmentProfile);
868
869	FrameBufferObject::Release();
870
871	PrintGLerror("combine ssao");
872	}
873
874
875
876	} // namespace

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