Changeset 2868 for GTP/trunk/App
- Timestamp:
- 08/26/08 16:27:11 (16 years ago)
- Location:
- GTP/trunk/App/Demos/Vis/FriendlyCulling
- Files:
-
- 1 added
- 9 edited
Legend:
- Unmodified
- Added
- Removed
-
GTP/trunk/App/Demos/Vis/FriendlyCulling/FriendlyCulling.vcproj
r2864 r2868 795 795 > 796 796 </File> 797 <File 798 RelativePath=".\src\shaders\ssao.cg" 799 > 800 </File> 801 <File 802 RelativePath=".\src\shaders\temporal.cg" 803 > 804 </File> 797 805 </Filter> 798 806 <File -
GTP/trunk/App/Demos/Vis/FriendlyCulling/default.env
r2867 r2868 11 11 camPosition=483.398f 242.364f 186.078f 12 12 camDirection=1 0 0 13 useFullScreen= 113 useFullScreen=0 14 14 useLODs=1 15 15 #modelPath=data/city/model/ -
GTP/trunk/App/Demos/Vis/FriendlyCulling/src/DeferredShader.cpp
r2867 r2868 55 55 void DeferredShader::Init(CGcontext context) 56 56 { 57 58 57 sCgDeferredProgram = 59 58 cgCreateProgramFromFile(context, … … 112 111 GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture(); 113 112 114 if (1)115 {116 glEnable(GL_TEXTURE_2D);117 // generate mip map levels for position texture118 glBindTexture(GL_TEXTURE_2D, colorsTex);119 glGenerateMipmapEXT(GL_TEXTURE_2D);120 }121 122 // read the second buffer, write to the first buffer123 113 mFbo->Bind(); 124 114 -
GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.cpp
r2867 r2868 19 19 20 20 static CGprogram sCgSsaoProgram = NULL; 21 static CGprogram sCgDeferredProgram2 = NULL; 22 static CGprogram sCgAntiAliasingProgram = NULL; 23 24 static CGparameter sColorsTexDeferredParam; 25 static CGparameter sPositionsTexDeferredParam; 26 static CGparameter sNormalsTexDeferredParam; 21 27 22 28 static CGparameter sColorsTexParam; 23 29 static CGparameter sPositionsTexParam; 24 30 static CGparameter sNormalsTexParam; 31 32 25 33 static CGparameter sOldModelViewProjMatrixParam; 26 34 static CGparameter sMaxDepthParam; … … 30 38 static CGparameter sNoiseMultiplierParam; 31 39 static CGparameter sExpFactorParam; 32 static CGprogram sCgAntiAliasingProgram;33 40 34 41 static CGparameter sColorsTexAntiAliasingParam; … … 81 88 mOldFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false); 82 89 90 mFbo3 = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE); 91 // the diffuse color buffer 92 mFbo3->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false); 93 83 94 84 95 // create noise texture for ssao … … 101 112 void SsaoShader::Init(CGcontext context) 102 113 { 103 /////////////// 104 105 sCgSsaoProgram = 114 sCgDeferredProgram2 = 106 115 cgCreateProgramFromFile(context, 107 116 CG_SOURCE, 108 117 "src/shaders/deferred.cg", 109 118 RenderState::sCgFragmentProfile, 110 "main_ssao", 119 "main2", 120 NULL); 121 122 if (sCgDeferredProgram2 != NULL) 123 { 124 cgGLLoadProgram(sCgDeferredProgram2); 125 126 // we need size of texture for scaling 127 sPositionsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram2, "positions"); 128 sColorsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram2, "colors"); 129 sNormalsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram2, "normals"); 130 } 131 else 132 cerr << "deferred program failed to load" << endl; 133 134 135 /////////////// 136 137 sCgSsaoProgram = 138 cgCreateProgramFromFile(context, 139 CG_SOURCE, 140 "src/shaders/ssao.cg", 141 RenderState::sCgFragmentProfile, 142 "main", 111 143 NULL); 112 144 … … 121 153 sNoiseTexParam = cgGetNamedParameter(sCgSsaoProgram, "noiseTexture"); 122 154 sNoiseMultiplierParam = cgGetNamedParameter(sCgSsaoProgram, "noiseMultiplier"); 155 123 156 sOldModelViewProjMatrixParam = cgGetNamedParameter(sCgSsaoProgram, "oldModelViewProj"); 124 157 sMaxDepthParam = cgGetNamedParameter(sCgSsaoProgram, "maxDepth"); … … 162 195 float expFactor) 163 196 { 164 cgGLSetMatrixParameterfc(sOldModelViewProjMatrixParam, (const float *)oldProjViewMatrix.x); 165 166 glPushAttrib(GL_VIEWPORT_BIT); 167 glViewport(0, 0, mWidth, mHeight); 168 169 glDrawBuffers(1, mymrt); 170 171 cgGLEnableProfile(RenderState::sCgFragmentProfile); 172 173 glDisable(GL_ALPHA_TEST); 174 glDisable(GL_TEXTURE_2D); 175 glDisable(GL_LIGHTING); 176 177 glMatrixMode(GL_PROJECTION); 178 glPushMatrix(); 179 glLoadIdentity(); 180 181 glMatrixMode(GL_MODELVIEW); 182 glPushMatrix(); 183 glLoadIdentity(); 184 185 const float offs = 0.5f; 186 glOrtho(-offs, offs, -offs, offs, 0, 1); 187 197 188 198 // switch roles of old and new fbo 189 199 // the algorihm uses two input fbos, where the one … … 192 202 swap(mNewFbo, mOldFbo); 193 203 204 cgGLSetMatrixParameterfc(sOldModelViewProjMatrixParam, (const float *)oldProjViewMatrix.x); 205 206 glPushAttrib(GL_VIEWPORT_BIT); 207 glViewport(0, 0, mWidth, mHeight); 208 209 FrameBufferObject::Release(); 210 211 glDrawBuffers(1, mymrt); 212 213 cgGLEnableProfile(RenderState::sCgFragmentProfile); 214 215 glDisable(GL_ALPHA_TEST); 216 glDisable(GL_TEXTURE_2D); 217 glDisable(GL_LIGHTING); 218 219 glMatrixMode(GL_PROJECTION); 220 glPushMatrix(); 221 glLoadIdentity(); 222 223 glMatrixMode(GL_MODELVIEW); 224 glPushMatrix(); 225 glLoadIdentity(); 226 227 const float offs = 0.5f; 228 glOrtho(-offs, offs, -offs, offs, 0, 1); 229 230 FirstPass(fbo); 194 231 ComputeSsao(fbo, expFactor); 195 // the second pass just renders the combined solution196 //DisplayTexture();197 232 AntiAliasing(fbo); 198 233 … … 214 249 void SsaoShader::ComputeSsao(FrameBufferObject *fbo, float expFactor) 215 250 { 216 GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture();251 GLuint colorsTex = mFbo3->GetColorBuffer(0)->GetTexture(); 217 252 GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture(); 218 253 GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture(); … … 228 263 // read the second buffer, write to the first buffer 229 264 mNewFbo->Bind(); 265 glDrawBuffers(1, mymrt); 266 230 267 GLuint oldTex = mOldFbo->GetColorBuffer(0)->GetTexture(); 231 268 232 glDrawBuffers(1, mymrt);233 234 269 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 235 270 271 cgGLEnableProfile(RenderState::sCgFragmentProfile); 236 272 cgGLBindProgram(sCgSsaoProgram); 237 273 … … 385 421 386 422 cgGLEnableProfile(RenderState::sCgFragmentProfile); 387 388 423 cgGLBindProgram(sCgAntiAliasingProgram); 389 424 390 425 cgGLSetTextureParameter(sColorsTexAntiAliasingParam, colorsTex); 391 426 cgGLEnableTextureParameter(sColorsTexAntiAliasingParam); … … 393 428 cgGLSetTextureParameter(sNormalsTexAntiAliasingParam, normalsTex); 394 429 cgGLEnableTextureParameter(sNormalsTexAntiAliasingParam); 395 430 396 431 glColor3f(1.0f, 1.0f, 1.0f); 397 432 … … 418 453 419 454 455 void SsaoShader::FirstPass(FrameBufferObject *fbo) 456 { 457 GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture(); 458 GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture(); 459 GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture(); 460 461 mFbo3->Bind(); 462 //mNewFbo->Bind(); 463 464 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 465 466 glDrawBuffers(1, mymrt); 467 468 cgGLEnableProfile(RenderState::sCgFragmentProfile); 469 470 cgGLBindProgram(sCgDeferredProgram2); 471 472 cgGLSetTextureParameter(sColorsTexDeferredParam, colorsTex); 473 cgGLEnableTextureParameter(sColorsTexDeferredParam); 474 475 cgGLSetTextureParameter(sPositionsTexDeferredParam, positionsTex); 476 cgGLEnableTextureParameter(sPositionsTexDeferredParam); 477 478 cgGLSetTextureParameter(sNormalsTexDeferredParam, normalsTex); 479 cgGLEnableTextureParameter(sNormalsTexDeferredParam); 480 481 glColor3f(1.0f, 1.0f, 1.0f); 482 483 const float offs = 0.5f; 484 485 glBegin(GL_QUADS); 486 487 glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f); 488 glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f); 489 glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f); 490 glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f); 491 492 glEnd(); 493 494 cgGLDisableTextureParameter(sColorsTexDeferredParam); 495 cgGLDisableTextureParameter(sPositionsTexDeferredParam); 496 cgGLDisableTextureParameter(sNormalsTexDeferredParam); 497 498 cgGLDisableProfile(RenderState::sCgFragmentProfile); 499 500 FrameBufferObject::Release(); 501 502 PrintGLerror("deferred shading"); 503 } 504 420 505 } // namespace -
GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.h
r2865 r2868 50 50 void ComputeSsao(FrameBufferObject *fbo, float expFactor); 51 51 52 //void DisplayTexture(); 52 void FirstPass(FrameBufferObject *fbo); 53 53 54 void AntiAliasing(FrameBufferObject *fbo); 54 55 … … 69 70 FrameBufferObject *mOldFbo; 70 71 FrameBufferObject *mNewFbo; 72 FrameBufferObject *mFbo3; 71 73 }; 72 74 -
GTP/trunk/App/Demos/Vis/FriendlyCulling/src/chcdemo.cpp
r2867 r2868 425 425 InitCg(); 426 426 427 DeferredShader::Init(sCgContext); 427 428 SsaoShader::Init(sCgContext); 428 DeferredShader::Init(sCgContext); 429 429 430 deferredShader = new DeferredShader(texWidth, texHeight); 430 431 ssaoShader = new SsaoShader(texWidth, texHeight, camera, myfar / 10.0f); 431 deferredShader = new DeferredShader(texWidth, texHeight);432 432 433 433 // initialize the render traverser … … 539 539 // the diffuse color buffer 540 540 fbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_NEAREST, false); 541 541 542 // the positions buffer 542 543 fbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_MIPMAP_LINEAR, true); 543 544 //fbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_NEAREST, true); 545 544 546 // the normals buffer 545 547 //fbo->AddColorBuffer(ColorBufferObject::BUFFER_UBYTE, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_NEAREST, false); -
GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/antialiasing.cg
r2867 r2868 11 11 12 12 // the barrier for detecting a discontinuity 13 uniform float4 e_barrier = float4(5e- 3, 5e-3, 0, 0); // x = normal, y = depth13 uniform float4 e_barrier = float4(5e-4, 5e-4, 0, 0); // x = normal, y = depth 14 14 // the weights for normal / depth discontinuity 15 15 uniform float4 e_weights = float4(1.0f, 1.0f, 1.0f, 1.0f); // x = normal, y = depth … … 32 32 nd.w = dot(nc, float3(tex2D(normals, IN.lb.xy))); 33 33 34 nd -= e_barrier.x;35 nd = step( 0.0f, nd);34 nd.x -= e_barrier.x; 35 nd = step((float4)0.0f, nd); 36 36 37 37 float ne = saturate(dot(nd, e_weights.x)); … … 83 83 84 84 return (s0 + s1 + s2 + s3) / 4.0f; 85 //return float4(w); 85 86 } -
GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/deferred.cg
r2867 r2868 1 ////////////////////2 // Screen Spaced Ambient Occlusion shader3 // mainly based on shader of Alexander Kusternig4 5 //#define NUM_SAMPLES 86 #define NUM_SAMPLES 167 8 // rule of thumb: approx 1 / NUM_SAMPLES9 #define SAMPLE_INTENSITY 0.1510 //#define SAMPLE_INTENSITY 0.125f11 12 #define AREA_SIZE 9e-1f13 //#define VIEW_CORRECTION_SCALE 0.3f14 #define VIEW_CORRECTION_SCALE 0.5f15 #define DISTANCE_SCALE 1e-6f16 17 1 struct fragment 18 2 { … … 30 14 31 15 32 float2 reflect(float2 pt, float2 n)33 {34 // distance to plane35 float d = dot(n, pt);36 // reflect around plane37 float2 rpt = pt - d * 2.0f * n;38 39 return rpt;40 }41 42 43 float2 rotate(float2 pt, float2 n)44 {45 float2 ptTransformed;46 ptTransformed.x = n.r * pt.x - n.g * pt.y;47 ptTransformed.y = n.g * pt.x + n.r * pt.y;48 49 return ptTransformed;50 }51 52 53 /** The ssao shader returning the an intensity value between 0 and 154 */55 float ssao(fragment IN,56 uniform sampler2D positions,57 uniform sampler2D noiseTexture,58 uniform float2 samples[NUM_SAMPLES],59 uniform float3 currentNormal,60 uniform float3 currentViewDir,61 uniform float noiseMultiplier,62 uniform float4 centerPosition63 )64 {65 // the w coordinate from the persp. projection66 float w = centerPosition.w;67 68 // Check in a circular area around the current position.69 // Shoot vectors to the positions there, and check the angle to these positions.70 // Summing up these angles gives an estimation of the occlusion at the current position.71 72 float total_ao = 0.0;73 74 const float areaSize = 5e-1f;75 76 for (int i = 0; i < NUM_SAMPLES; i ++)77 {78 float2 offset = samples[i];79 80 //sample noisetex; r stores costheta, g stores sintheta81 //float2 mynoise = tex2D(noiseTexture, IN.texCoord.xy * noiseMultiplier).xy * 2.0f - 1.0f;82 float2 mynoise = tex2D(noiseTexture, IN.texCoord.xy * noiseMultiplier).xy;83 84 // rotation85 //float2 offsetTransformed = offset;86 //float2 offsetTransformed = rotate(offset, mynoise);87 float2 offsetTransformed = reflect(offset, mynoise);88 89 // weight with projected coordinate to reach similar kernel size for near and far90 float2 texcoord = IN.texCoord.xy + offsetTransformed * AREA_SIZE * w;91 92 // sample downsampled texture in order to speed up texture accesses93 float3 sample_position = tex2Dlod(positions, float4(texcoord, 0, 1)).xyz;94 //float3 sample_position = tex2D(positions, texcoord).xyz;95 96 float3 vector_to_sample = sample_position - centerPosition.xyz;97 float length_to_sample = length(vector_to_sample);98 float3 direction_to_sample = vector_to_sample / length_to_sample;99 100 // Angle between current normal and direction to sample controls AO intensity.101 float cos_angle = dot(direction_to_sample, currentNormal);102 cos_angle = max(cos_angle, 0.0f);103 104 // distance between current position and sample position controls AO intensity.105 float distance_intensity =106 (SAMPLE_INTENSITY * DISTANCE_SCALE) / (DISTANCE_SCALE + length_to_sample * length_to_sample);107 108 // if surface normal perpenticular to view dir, some samples probably count less109 // => compensate for this110 float view_correction = 1.0f + VIEW_CORRECTION_SCALE * (1.0f - dot(currentViewDir, currentNormal));111 112 total_ao += cos_angle * distance_intensity * view_correction;113 }114 115 return (1.0f - total_ao);116 //return dot(currentViewDir, currentNormal);117 }118 119 120 /** Computes ambient occlusion + diffuse reflections121 */122 float4 globIllum(fragment IN,123 uniform sampler2D colors,124 uniform sampler2D positions,125 uniform sampler2D noiseTexture,126 uniform float2 samples[NUM_SAMPLES],127 uniform float3 currentNormal,128 uniform float3 currentViewDir,129 uniform float noiseMultiplier,130 uniform float4 centerPosition131 )132 {133 // the w coordinate from the persp. projection134 float w = centerPosition.w;135 136 // Check in a circular area around the current position.137 // Shoot vectors to the positions there, and check the angle to these positions.138 // Summing up these angles gives an estimation of the occlusion at the current position.139 140 float total_ao = 0.0;141 float3 total_color = float3(0.0f);142 143 const float areaSize = 5e-1f;144 145 for (int i = 0; i < NUM_SAMPLES; i ++)146 {147 float2 offset = samples[i];148 149 //sample noisetex; r stores costheta, g stores sintheta150 float2 mynoise = tex2D(noiseTexture, IN.texCoord.xy * noiseMultiplier).xy * 2.0f - 1.0f;151 152 // rotation153 float2 offsetTransformed = rotate(offset, mynoise);154 155 // weight with projected coordinate to reach similar kernel size for near and far156 float2 texcoord = IN.texCoord.xy + offsetTransformed * AREA_SIZE * w;157 158 float3 sample_position = tex2D(positions, texcoord).xyz;159 float3 sample_color = tex2D(colors, texcoord).xyz;160 161 float3 vector_to_sample = sample_position - centerPosition.xyz;162 float length_to_sample = length(vector_to_sample);163 float3 direction_to_sample = vector_to_sample / length_to_sample;164 165 // Angle between current normal and direction to sample controls AO intensity.166 float cos_angle = dot(direction_to_sample, currentNormal);167 cos_angle = max(cos_angle, 0.0f);168 169 // distance between current position and sample position controls AO intensity.170 float distance_intensity =171 (SAMPLE_INTENSITY * DISTANCE_SCALE) / (DISTANCE_SCALE + length_to_sample * length_to_sample);172 173 // if normal perpenticular to view dir, only half of the samples count174 float view_correction = 1.0f + VIEW_CORRECTION_SCALE * (1.0f - dot(currentViewDir, currentNormal));175 176 total_ao += cos_angle * distance_intensity * view_correction;177 total_color += cos_angle * distance_intensity * view_correction * sample_color * 0.3f;178 }179 180 return float4(total_color, 1.0f - total_ao);181 }182 183 16 184 17 /** function for standard deferred shading 185 18 */ 186 19 float4 shade(fragment IN, 187 uniform sampler2D colors,188 uniform sampler2D positions,20 uniform float4 color, 21 uniform float4 position, 189 22 uniform float3 normal, 190 23 uniform float amb) … … 193 26 float4 lightDir2 = float4(-0.5f, 0.5f, 0.4f, 0.0f); 194 27 195 float4 color = tex2D(colors, IN.texCoord.xy); 196 197 float4 position = tex2D(positions, IN.texCoord.xy); 198 199 float4 ambient = 0.3f; 28 // global ambient 29 const float4 ambient = 0.3f; 200 30 201 31 // float3 L = normalize(lightPosition - position); … … 212 42 213 43 214 /** The mrt shader for s creen space ambient occlusion44 /** The mrt shader for standard rendering 215 45 */ 216 pixel main_ssao(fragment IN, 217 uniform sampler2D colors, 218 uniform sampler2D positions, 219 uniform sampler2D normals, 220 uniform sampler2D noiseTexture, 221 uniform float2 samples[NUM_SAMPLES], 222 uniform float noiseMultiplier, 223 uniform sampler2D oldTex, 224 const uniform float4x4 oldModelViewProj, 225 uniform float maxDepth, 226 uniform float expFactor 227 ) 46 pixel main2(fragment IN, 47 uniform sampler2D colors, 48 uniform sampler2D positions, 49 uniform sampler2D normals 50 ) 228 51 { 229 52 pixel OUT; 230 53 231 float4 normal = tex2D(normals, IN.texCoord.xy); 232 233 // the ambient term 234 float amb = normal.w; 54 float4 norm = tex2D(normals, IN.texCoord.xy); 55 float4 color = tex2D(colors, IN.texCoord.xy); 56 float4 position = tex2D(positions, IN.texCoord.xy); 57 58 // an ambient color term 59 float amb = norm.w; 235 60 236 61 // expand normal 237 normal = normalize(normal);// * 2.0f - 1.0f); 238 /// the current view direction 239 float3 viewDir = normalize(IN.view * 2.0f - float3(1.0f)); 62 float3 normal = normalize(norm.xyz);// * 2.0f - float4(1.0f)); 240 63 241 // the current world position 242 float4 centerPosition = tex2D(positions, IN.texCoord.xy); 64 float4 col = shade(IN, color, position, normal, amb); 243 65 244 float4 col = shade(IN, colors, positions, normal.xyz, amb); 245 246 float ao = ssao(IN, positions, noiseTexture, samples, normal.xyz, viewDir, noiseMultiplier, centerPosition); 247 float4 attenuated_color = ao * col; 248 //float4 attenuated_color = ao; 249 250 //float4 new_col = globIllum(IN, colors, positions, noiseTexture, samples, normal.xyz, viewDir, noiseMultiplier, centerPosition); 251 //float4 attenuated_color = ao * col + new_col; 252 253 const float x = expFactor; 254 255 float4 dummy = centerPosition * maxDepth; 256 dummy.w = 1.0f; 257 258 float4 oldPos = mul(oldModelViewProj, dummy); 259 260 float newDepth = oldPos.z / oldPos.w; 261 262 float2 tex = (oldPos.xy / oldPos.w) * 0.5f + 0.5f; 263 float4 col1 = tex2D(oldTex, tex); 264 265 float oldDepth = col1.w; 266 float depthDif = 1.0f - newDepth / oldDepth; 267 268 if ((tex.x >= 0.0f) && (tex.x < 1.0f) && 269 (tex.y >= 0.0f) && (tex.y < 1.0f) && 270 (abs(depthDif) < 1e-4f)) 271 { 272 OUT.color = attenuated_color * expFactor + col1 * float4(1.0f - expFactor); 273 } 274 else 275 { 276 OUT.color = attenuated_color; 277 } 278 279 //OUT.color.xyz = viewDir; 280 //OUT.color = attenuated_color; 281 282 OUT.color.w = tex2D(colors, IN.texCoord.xy).w; 66 //OUT.color = float4(1.0f); 67 OUT.color = col; 68 OUT.color.w = color.w; 283 69 284 70 return OUT; 285 71 } 286 287 72 288 73 /** The mrt shader for standard rendering … … 296 81 pixel OUT; 297 82 298 float4 normal = tex2D(normals, IN.texCoord.xy); 83 float4 norm = tex2D(normals, IN.texCoord.xy); 84 float4 color = tex2D(colors, IN.texCoord.xy); 85 float4 position = tex2D(positions, IN.texCoord.xy); 299 86 300 87 // an ambient color term 301 float amb = norm al.w;88 float amb = norm.w; 302 89 303 90 // expand normal 304 normal = normalize(normal);// * 2.0f - float4(1.0f));91 float3 normal = normalize(norm.xyz);// * 2.0f - float4(1.0f)); 305 92 306 float4 col = shade(IN, color s, positions, normal.xyz, amb);93 float4 col = shade(IN, color, position, normal.xyz, amb); 307 94 95 //OUT.color = float4(1.0f); 308 96 OUT.color = col; 309 97 -
GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg
r2809 r2868 1 //////////////////// 2 // Screen Spaced Ambient Occlusion shader 3 // based on shader of Alexander Kusternig 4 5 //#define NUM_SAMPLES 8 6 #define NUM_SAMPLES 16 7 8 // rule of thumb: approx 1 / NUM_SAMPLES 9 #define SAMPLE_INTENSITY 0.15 10 //#define SAMPLE_INTENSITY 0.125f 11 12 #define AREA_SIZE 9e-1f 13 //#define VIEW_CORRECTION_SCALE 0.3f 14 #define VIEW_CORRECTION_SCALE 0.5f 15 #define DISTANCE_SCALE 1e-6f 16 17 1 18 struct fragment 2 19 { 3 float4 pos: WPOS;// normalized screen position4 float4 view: COLOR;5 float4 texcoord: TEXCOORD0;6 float4 lindepth: TEXCOORD1;20 // normalized screen position 21 float4 pos: WPOS; 22 float4 texCoord: TEXCOORD0; 23 float3 view: COLOR0; 7 24 }; 8 25 … … 10 27 struct pixel 11 28 { 12 float4 col: COLOR0;29 float4 color: COLOR0; 13 30 }; 14 31 15 32 16 float 3 reflect(float3 pt, float3n)33 float2 reflect(float2 pt, float2 n) 17 34 { 18 35 // distance to plane 19 36 float d = dot(n, pt); 20 37 // reflect around plane 21 float3 rpt = pt - d * 2.0f * n; 22 23 //return pt; 38 float2 rpt = pt - d * 2.0f * n; 39 24 40 return rpt; 25 41 } 26 42 27 43 44 float2 rotate(float2 pt, float2 n) 45 { 46 float2 ptTransformed; 47 ptTransformed.x = n.r * pt.x - n.g * pt.y; 48 ptTransformed.y = n.g * pt.x + n.r * pt.y; 49 50 return ptTransformed; 51 } 52 53 54 /** The ssao shader returning the an intensity value between 0 and 1 55 */ 56 float ssao(fragment IN, 57 uniform sampler2D positions, 58 uniform sampler2D noiseTexture, 59 uniform float2 samples[NUM_SAMPLES], 60 uniform float3 currentNormal, 61 uniform float3 currentViewDir, 62 uniform float noiseMultiplier, 63 uniform float4 centerPosition 64 ) 65 { 66 // the w coordinate from the persp. projection 67 float w = centerPosition.w; 68 69 // Check in a circular area around the current position. 70 // Shoot vectors to the positions there, and check the angle to these positions. 71 // Summing up these angles gives an estimation of the occlusion at the current position. 72 73 float total_ao = 0.0; 74 75 const float areaSize = 5e-1f; 76 77 for (int i = 0; i < NUM_SAMPLES; i ++) 78 { 79 float2 offset = samples[i]; 80 81 //sample noisetex; r stores costheta, g stores sintheta 82 //float2 mynoise = tex2D(noiseTexture, IN.texCoord.xy * noiseMultiplier).xy * 2.0f - 1.0f; 83 float2 mynoise = tex2D(noiseTexture, IN.texCoord.xy * noiseMultiplier).xy; 84 85 // rotation 86 //float2 offsetTransformed = offset; 87 //float2 offsetTransformed = rotate(offset, mynoise); 88 float2 offsetTransformed = reflect(offset, mynoise); 89 90 // weight with projected coordinate to reach similar kernel size for near and far 91 float2 texcoord = IN.texCoord.xy + offsetTransformed * AREA_SIZE * w; 92 93 // sample downsampled texture in order to speed up texture accesses 94 float3 sample_position = tex2Dlod(positions, float4(texcoord, 0, 1)).xyz; 95 //float3 sample_position = tex2D(positions, texcoord).xyz; 96 97 float3 vector_to_sample = sample_position - centerPosition.xyz; 98 float length_to_sample = length(vector_to_sample); 99 float3 direction_to_sample = vector_to_sample / length_to_sample; 100 101 // Angle between current normal and direction to sample controls AO intensity. 102 float cos_angle = dot(direction_to_sample, currentNormal); 103 cos_angle = max(cos_angle, 0.0f); 104 105 // distance between current position and sample position controls AO intensity. 106 float distance_intensity = 107 (SAMPLE_INTENSITY * DISTANCE_SCALE) / (DISTANCE_SCALE + length_to_sample * length_to_sample); 108 109 // if surface normal perpenticular to view dir, some samples probably count less 110 // => compensate for this 111 float view_correction = 1.0f + VIEW_CORRECTION_SCALE * (1.0f - dot(currentViewDir, currentNormal)); 112 113 total_ao += cos_angle * distance_intensity * view_correction; 114 } 115 116 return (1.0f - total_ao); 117 //return dot(currentViewDir, currentNormal); 118 } 119 120 121 /** Computes ambient occlusion + diffuse reflections 122 */ 123 float4 globIllum(fragment IN, 124 uniform sampler2D colors, 125 uniform sampler2D positions, 126 uniform sampler2D noiseTexture, 127 uniform float2 samples[NUM_SAMPLES], 128 uniform float3 currentNormal, 129 uniform float3 currentViewDir, 130 uniform float noiseMultiplier, 131 uniform float4 centerPosition 132 ) 133 { 134 // the w coordinate from the persp. projection 135 float w = centerPosition.w; 136 137 // Check in a circular area around the current position. 138 // Shoot vectors to the positions there, and check the angle to these positions. 139 // Summing up these angles gives an estimation of the occlusion at the current position. 140 141 float total_ao = 0.0; 142 float3 total_color = float3(0.0f); 143 144 const float areaSize = 5e-1f; 145 146 for (int i = 0; i < NUM_SAMPLES; i ++) 147 { 148 float2 offset = samples[i]; 149 150 //sample noisetex; r stores costheta, g stores sintheta 151 float2 mynoise = tex2D(noiseTexture, IN.texCoord.xy * noiseMultiplier).xy * 2.0f - 1.0f; 152 153 // rotation 154 float2 offsetTransformed = rotate(offset, mynoise); 155 156 // weight with projected coordinate to reach similar kernel size for near and far 157 float2 texcoord = IN.texCoord.xy + offsetTransformed * AREA_SIZE * w; 158 159 float3 sample_position = tex2D(positions, texcoord).xyz; 160 float3 sample_color = tex2D(colors, texcoord).xyz; 161 162 float3 vector_to_sample = sample_position - centerPosition.xyz; 163 float length_to_sample = length(vector_to_sample); 164 float3 direction_to_sample = vector_to_sample / length_to_sample; 165 166 // Angle between current normal and direction to sample controls AO intensity. 167 float cos_angle = dot(direction_to_sample, currentNormal); 168 cos_angle = max(cos_angle, 0.0f); 169 170 // distance between current position and sample position controls AO intensity. 171 float distance_intensity = 172 (SAMPLE_INTENSITY * DISTANCE_SCALE) / (DISTANCE_SCALE + length_to_sample * length_to_sample); 173 174 // if normal perpenticular to view dir, only half of the samples count 175 float view_correction = 1.0f + VIEW_CORRECTION_SCALE * (1.0f - dot(currentViewDir, currentNormal)); 176 177 total_ao += cos_angle * distance_intensity * view_correction; 178 total_color += cos_angle * distance_intensity * view_correction * sample_color * 0.3f; 179 } 180 181 return float4(total_color, 1.0f - total_ao); 182 } 183 184 185 /** The mrt shader for screen space ambient occlusion 186 */ 28 187 pixel main(fragment IN, 29 uniform sampler2D lindepth, 30 uniform sampler2D scene, 31 uniform sampler2D normal, 32 uniform float invTexSize, 33 uniform float radius, 34 uniform float3 eyevec, 35 uniform float3 samples[32]) 36 { 37 pixel OUT; 188 uniform sampler2D colors, 189 uniform sampler2D positions, 190 uniform sampler2D normals, 191 uniform sampler2D noiseTexture, 192 uniform float2 samples[NUM_SAMPLES], 193 uniform float noiseMultiplier, 194 uniform sampler2D oldTex, 195 const uniform float4x4 oldModelViewProj, 196 uniform float maxDepth, 197 uniform float expFactor 198 ) 199 { 200 pixel OUT; 201 202 float4 normal = tex2D(normals, IN.texCoord.xy); 203 204 // the ambient term 205 float amb = normal.w; 206 207 // expand normal 208 normal = normalize(normal);// * 2.0f - 1.0f); 209 /// the current view direction 210 float3 viewDir = normalize(IN.view * 2.0f - float3(1.0f)); 211 212 // the current world position 213 float4 centerPosition = tex2D(positions, IN.texCoord.xy); 214 215 float4 col = tex2D(colors, IN.texCoord.xy); 216 float currentDepth = col.w; 217 218 float ao = ssao(IN, positions, noiseTexture, samples, normal.xyz, viewDir, noiseMultiplier, centerPosition); 219 float4 attenuated_color = ao * col; 220 //float4 attenuated_color = ao; 221 222 //float4 new_col = globIllum(IN, colors, positions, noiseTexture, samples, normal.xyz, viewDir, noiseMultiplier, centerPosition); 223 //float4 attenuated_color = ao * col + new_col; 224 225 const float x = expFactor; 226 227 float4 dummy = centerPosition * maxDepth; 228 dummy.w = 1.0f; 229 230 float4 oldPos = mul(oldModelViewProj, dummy); 231 232 float newDepth = oldPos.z / oldPos.w; 38 233 39 // eye space z 40 float eyez = tex2D(lindepth, IN.texcoord.xy).x; 41 42 float3 viewvec = IN.view.xyz * 2.0f - float3(1.0f); 43 viewvec /= viewvec.z; 44 45 //return float4(viewvec.xyz, 1.0f); 46 // eye point 47 //float3 eyept = eyez * viewvec; 48 float3 eyept = float3(IN.texcoord.xy, eyez); 49 50 float4 pl = tex2D(normal, IN.pos.xy * invTexSize); 51 pl = pl * 2.0 - float4(1.0); 52 53 float occlusion = 0.0; 54 55 // gather occlusion from surrounding samples 56 for (int i = 0; i < 32; i ++) 57 { 58 // generate new sample point 59 //float3 samplepos = eyept + radius * samples[i]; 60 // create some dithering by reflecting the sample point alond some random plane 61 float3 samplepos = eyept + radius * reflect(samples[i], pl.xyz); 62 63 // project to texture space q: why the scaling? 64 float2 sampletex = (samplepos.xy / samplepos.z);// * float2(0.75, 1.0); 65 66 //float2 sampletexn = sampletex; 67 // normalize to [0 .. 1], move eye point to center 68 //float2 sampletexn = sampletex * 0.5f + float2(0.5f); 69 float2 sampletexn = sampletex + float2(0.5f); 70 71 // look up depth at sample point 72 float depth = tex2D(lindepth, sampletexn).x; 73 // compare: is point occluded? 74 //float zdist = 50.0f * max(-samplepos.z + depth, 0.0f); 75 float zdist = 50.0f * max(samplepos.z - depth, 0.0f); 76 // occlusion factor shrinks quadratic with distance to occluder 77 occlusion += 1.0 / (1.0 + zdist * zdist); 78 //occlusion += 1.0 / (1.0 + zdist); 79 } 80 81 // normalize 82 occlusion /= 32.0f; 83 84 OUT.col = 1.0f - occlusion; 85 // OUT.col = tex2D(scene, IN.texcoord.xy) * 0.5 + (1.0f - occlusion); 86 87 return OUT; 88 } 234 float2 tex = (oldPos.xy / oldPos.w) * 0.5f + 0.5f; 235 float4 col1 = tex2D(oldTex, tex); 236 237 float oldDepth = col1.w; 238 float depthDif = 1.0f - newDepth / oldDepth; 239 240 if ((tex.x >= 0.0f) && (tex.x < 1.0f) && 241 (tex.y >= 0.0f) && (tex.y < 1.0f) && 242 (abs(depthDif) < 1e-4f)) 243 { 244 OUT.color = attenuated_color * expFactor + col1 * float4(1.0f - expFactor); 245 } 246 else 247 { 248 OUT.color = attenuated_color; 249 } 250 251 //OUT.color.xyz = viewDir; 252 //OUT.color = attenuated_color; 253 254 OUT.color.w = currentDepth; 255 256 return OUT; 257 }
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