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author	John Tsiombikas <nuclear@member.fsf.org>
date	Wed, 21 Jan 2015 11:37:50 +0200
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1 /************************************************************************************

3 Filename : CAPI_GL_Shaders.h

4 Content : Distortion shader header for GL

5 Created : November 11, 2013

6 Authors : David Borel, Volga Aksoy

10 Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");

11 you may not use the Oculus VR Rift SDK except in compliance with the License,

12 which is provided at the time of installation or download, or which

13 otherwise accompanies this software in either electronic or hard copy form.

15 You may obtain a copy of the License at

17 http://www.oculusvr.com/licenses/LICENSE-3.2

19 Unless required by applicable law or agreed to in writing, the Oculus VR SDK

20 distributed under the License is distributed on an "AS IS" BASIS,

21 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

22 See the License for the specific language governing permissions and

23 limitations under the License.

25 ************************************************************************************/

28 #ifndef OVR_CAPI_GL_Shaders_h

29 #define OVR_CAPI_GL_Shaders_h

32 #include "CAPI_GL_Util.h"

34 namespace OVR { namespace CAPI { namespace GL {

36 static const char glsl2Prefix[] =

37 "#version 110\n"

38 "#extension GL_ARB_shader_texture_lod : enable\n"

39 "#extension GL_ARB_draw_buffers : enable\n"

40 "#extension GL_EXT_gpu_shader4 : enable\n"

41 "#define _FRAGCOLOR_DECLARATION\n"

42 "#define _MRTFRAGCOLOR0_DECLARATION\n"

43 "#define _MRTFRAGCOLOR1_DECLARATION\n"

44 "#define _GLFRAGCOORD_DECLARATION\n"

45 "#define _VS_IN attribute\n"

46 "#define _VS_OUT varying\n"

47 "#define _FS_IN varying\n"

48 "#define _TEXTURELOD texture2DLod\n"

49 "#define _TEXTURE texture2D\n"

50 "#define _FRAGCOLOR gl_FragColor\n"

51 "#define _MRTFRAGCOLOR0 gl_FragData[0]\n"

52 "#define _MRTFRAGCOLOR1 gl_FragData[1]\n" // The texture coordinate [0.0,1.0] for texel i of a texture of size N is: (2i + 1)/2N

53 "#ifdef GL_EXT_gpu_shader4\n"

54 " #define _TEXELFETCHDECL vec4 texelFetch(sampler2D tex, ivec2 coord, int lod){ ivec2 size = textureSize2D(tex, lod); return texture2D(tex, vec2(float((coord.x * 2) + 1) / float(size.x * 2), float((coord.y * 2) + 1) / float(size.y * 2))); }\n"

55 "#endif\n";

57 static const char glsl3Prefix[] =

58 "#version 150\n"

59 "#define _FRAGCOLOR_DECLARATION out vec4 FragColor;\n"

60 "#define _MRTFRAGCOLOR0_DECLARATION out vec4 FragData0;\n"

61 "#define _MRTFRAGCOLOR1_DECLARATION out vec4 FragData1;\n"

62 "#define _GLFRAGCOORD_DECLARATION in vec4 gl_FragCoord;\n"

63 "#define _VS_IN in\n"

64 "#define _VS_OUT out\n"

65 "#define _FS_IN in\n"

66 "#define _TEXTURELOD textureLod\n"

67 "#define _TEXTURE texture\n"

68 "#define _FRAGCOLOR FragColor\n"

69 "#define _MRTFRAGCOLOR0 FragData0\n"

70 "#define _MRTFRAGCOLOR1 FragData1\n"

71 "#define _TEXELFETCHDECL\n";

73 static const char SimpleQuad_vs[] =

74 "uniform vec2 PositionOffset;\n"

75 "uniform vec2 Scale;\n"

77 "_VS_IN vec3 Position;\n"

79 "void main()\n"

80 "{\n"

81 " gl_Position = vec4(Position.xy * Scale + PositionOffset, 0.5, 1.0);\n"

82 "}\n";

84 const OVR::CAPI::GL::ShaderBase::Uniform SimpleQuad_vs_refl[] =

85 {

86 { "PositionOffset", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 8 },

87 { "Scale", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 8, 8 },

88 };

90 static const char SimpleQuad_fs[] =

91 "uniform vec4 Color;\n"

93 "_FRAGCOLOR_DECLARATION\n"

95 "void main()\n"

96 "{\n"

97 " _FRAGCOLOR = Color;\n"

98 "}\n";

100 const OVR::CAPI::GL::ShaderBase::Uniform SimpleQuad_fs_refl[] =

101 {

102 { "Color", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 16 },

103 };

104

105 static const char SimpleQuadGamma_fs[] =

106 "uniform vec4 Color;\n"

107

108 "_FRAGCOLOR_DECLARATION\n"

109

110 "void main()\n"

111 "{\n"

112 " _FRAGCOLOR.rgb = pow(Color.rgb, vec3(2.2));\n"

113 " _FRAGCOLOR.a = Color.a;\n"

114 "}\n";

115

116 const OVR::CAPI::GL::ShaderBase::Uniform SimpleQuadGamma_fs_refl[] =

117 {

118 { "Color", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 16 },

119 };

120

121 // This must be prefixed with glsl2Prefix or glsl3Prefix before being compiled.

122 static const char SimpleTexturedQuad_vs[] =

123 "uniform vec2 PositionOffset;\n"

124 "uniform vec2 Scale;\n"

125

126 "_VS_IN vec3 Position;\n"

127 "_VS_IN vec4 Color;\n"

128 "_VS_IN vec2 TexCoord;\n"

129

130 "_VS_OUT vec4 oColor;\n"

131 "_VS_OUT vec2 oTexCoord;\n"

132

133 "void main()\n"

134 "{\n"

135 " gl_Position = vec4(Position.xy * Scale + PositionOffset, 0.5, 1.0);\n"

136 " oColor = Color;\n"

137 " oTexCoord = TexCoord;\n"

138 "}\n";

139

140 // The following declaration is copied from the generated D3D SimpleTexturedQuad_vs_refl.h file, with D3D_NS renamed to GL.

141 const OVR::CAPI::GL::ShaderBase::Uniform SimpleTexturedQuad_vs_refl[] =

142 {

143 { "PositionOffset", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 8 },

144 { "Scale", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 8, 8 },

145 };

146

147

148 // This must be prefixed with glsl2Prefix or glsl3Prefix before being compiled.

149 static const char SimpleTexturedQuad_ps[] =

150 "uniform sampler2D Texture0;\n"

151

152 "_FS_IN vec4 oColor;\n"

153 "_FS_IN vec2 oTexCoord;\n"

154

155 "_FRAGCOLOR_DECLARATION\n"

156

157 "void main()\n"

158 "{\n"

159 " _FRAGCOLOR = oColor * _TEXTURE(Texture0, oTexCoord);\n"

160 "}\n";

161

162 // The following is copied from the generated D3D SimpleTexturedQuad_ps_refl.h file, with D3D_NS renamed to GL.

163 const OVR::CAPI::GL::ShaderBase::Uniform SimpleTexturedQuad_ps_refl[] =

164 {

165 { "Color", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 16 },

166 };

167

168

169 static const char Distortion_vs[] =

170 "uniform vec2 EyeToSourceUVScale;\n"

171 "uniform vec2 EyeToSourceUVOffset;\n"

172

173 "_VS_IN vec2 Position;\n"

174 "_VS_IN vec4 Color;\n"

175 "_VS_IN vec2 TexCoord0;\n"

176

177 "_VS_OUT vec4 oColor;\n"

178 "_VS_OUT vec2 oTexCoord0;\n"

179

180 "void main()\n"

181 "{\n"

182 " gl_Position.x = Position.x;\n"

183 " gl_Position.y = Position.y;\n"

184 " gl_Position.z = 0.5;\n"

185 " gl_Position.w = 1.0;\n"

186 // Vertex inputs are in TanEyeAngle space for the R,G,B channels (i.e. after chromatic aberration and distortion).

187 // Scale them into the correct [0-1],[0-1] UV lookup space (depending on eye)

188 " oTexCoord0 = TexCoord0 * EyeToSourceUVScale + EyeToSourceUVOffset;\n"

189 " oColor = Color;\n" // Used for vignette fade.

190 "}\n";

191

192 const OVR::CAPI::GL::ShaderBase::Uniform Distortion_vs_refl[] =

193 {

194 { "EyeToSourceUVScale", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 8 },

195 { "EyeToSourceUVOffset", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 8, 8 },

196 };

197

198 static const char Distortion_fs[] =

199 "uniform sampler2D Texture0;\n"

200

201 "_FS_IN vec4 oColor;\n"

202 "_FS_IN vec2 oTexCoord0;\n"

203

204 "_FRAGCOLOR_DECLARATION\n"

205

206 "void main()\n"

207 "{\n"

208 " _FRAGCOLOR = _TEXTURE(Texture0, oTexCoord0, 0.0);\n"

209 " _FRAGCOLOR.a = 1.0;\n"

210 "}\n";

211

212

213 static const char DistortionTimewarp_vs[] =

214 "uniform vec2 EyeToSourceUVScale;\n"

215 "uniform vec2 EyeToSourceUVOffset;\n"

216 "uniform mat4 EyeRotationStart;\n"

217 "uniform mat4 EyeRotationEnd;\n"

218

219 "_VS_IN vec2 Position;\n"

220 "_VS_IN vec4 Color;\n"

221 "_VS_IN vec2 TexCoord0;\n"

222

223 "_VS_OUT vec4 oColor;\n"

224 "_VS_OUT vec2 oTexCoord0;\n"

225

226 "void main()\n"

227 "{\n"

228 " gl_Position.x = Position.x;\n"

229 " gl_Position.y = Position.y;\n"

230 " gl_Position.z = 0.0;\n"

231 " gl_Position.w = 1.0;\n"

232

233 // Vertex inputs are in TanEyeAngle space for the R,G,B channels (i.e. after chromatic aberration and distortion).

234 // These are now "real world" vectors in direction (x,y,1) relative to the eye of the HMD.

235 " vec3 TanEyeAngle = vec3 ( TexCoord0.x, TexCoord0.y, 1.0 );\n"

236

237 // Accurate time warp lerp vs. faster

238 #if 1

239 // Apply the two 3x3 timewarp rotations to these vectors.

240 " vec3 TransformedStart = (EyeRotationStart * vec4(TanEyeAngle, 0)).xyz;\n"

241 " vec3 TransformedEnd = (EyeRotationEnd * vec4(TanEyeAngle, 0)).xyz;\n"

242 // And blend between them.

243 " vec3 Transformed = mix ( TransformedStart, TransformedEnd, Color.a );\n"

244 #else

245 " mat4 EyeRotation = mix ( EyeRotationStart, EyeRotationEnd, Color.a );\n"

246 " vec3 Transformed = EyeRotation * TanEyeAngle;\n"

247 #endif

248

249 // Project them back onto the Z=1 plane of the rendered images.

250 " float RecipZ = 1.0 / Transformed.z;\n"

251 " vec2 Flattened = vec2 ( Transformed.x * RecipZ, Transformed.y * RecipZ );\n"

252

253 // These are now still in TanEyeAngle space.

254 // Scale them into the correct [0-1],[0-1] UV lookup space (depending on eye)

255 " vec2 SrcCoord = Flattened * EyeToSourceUVScale + EyeToSourceUVOffset;\n"

256 " oTexCoord0 = SrcCoord;\n"

257 " oColor = vec4(Color.r, Color.r, Color.r, Color.r);\n" // Used for vignette fade.

258 "}\n";

259

260

261 const OVR::CAPI::GL::ShaderBase::Uniform DistortionTimewarp_vs_refl[] =

262 {

263 { "EyeToSourceUVScale", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 8 },

264 { "EyeToSourceUVOffset", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 8, 8 },

265 };

266

267 static const char DistortionChroma_vs[] =

268 "uniform vec2 EyeToSourceUVScale;\n"

269 "uniform vec2 EyeToSourceUVOffset;\n"

270

271 "_VS_IN vec2 Position;\n"

272 "_VS_IN vec4 Color;\n"

273 "_VS_IN vec2 TexCoord0;\n"

274 "_VS_IN vec2 TexCoord1;\n"

275 "_VS_IN vec2 TexCoord2;\n"

276

277 "_VS_OUT vec4 oColor;\n"

278 "_VS_OUT vec2 oTexCoord0;\n"

279 "_VS_OUT vec2 oTexCoord1;\n"

280 "_VS_OUT vec2 oTexCoord2;\n"

281

282 "void main()\n"

283 "{\n"

284 " gl_Position.x = Position.x;\n"

285 " gl_Position.y = Position.y;\n"

286 " gl_Position.z = 0.5;\n"

287 " gl_Position.w = 1.0;\n"

288

289 // Vertex inputs are in TanEyeAngle space for the R,G,B channels (i.e. after chromatic aberration and distortion).

290 // Scale them into the correct [0-1],[0-1] UV lookup space (depending on eye)

291 " oTexCoord0 = TexCoord0 * EyeToSourceUVScale + EyeToSourceUVOffset;\n"

292 " oTexCoord1 = TexCoord1 * EyeToSourceUVScale + EyeToSourceUVOffset;\n"

293 " oTexCoord2 = TexCoord2 * EyeToSourceUVScale + EyeToSourceUVOffset;\n"

294

295 " oColor = Color;\n" // Used for vignette fade.

296 "}\n";

297

298 const OVR::CAPI::GL::ShaderBase::Uniform DistortionChroma_vs_refl[] =

299 {

300 { "EyeToSourceUVScale", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 8 },

301 { "EyeToSourceUVOffset", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 8, 8 },

302 };

303

304 static const char DistortionChroma_fs[] =

305 "uniform sampler2D Texture0;\n"

306 "uniform sampler2D Texture1;\n"

307 "uniform vec3 OverdriveScales_IsSrgb;\n"

308

309 "_FS_IN vec4 oColor;\n"

310 "_FS_IN vec2 oTexCoord0;\n"

311 "_FS_IN vec2 oTexCoord1;\n"

312 "_FS_IN vec2 oTexCoord2;\n"

313

314 "_MRTFRAGCOLOR0_DECLARATION\n" // Desired color (next frame's "PrevTexture")

315 "_MRTFRAGCOLOR1_DECLARATION\n" // Overdriven color (Back-buffer)

316 "_GLFRAGCOORD_DECLARATION\n"

317

318 "#ifdef _TEXELFETCHDECL\n"

319 "_TEXELFETCHDECL\n"

320 "#endif\n"

321

322 "void main()\n"

323 "{\n"

324 " float ResultR = _TEXTURE(Texture0, oTexCoord0, 0.0).r;\n"

325 " float ResultG = _TEXTURE(Texture0, oTexCoord1, 0.0).g;\n"

326 " float ResultB = _TEXTURE(Texture0, oTexCoord2, 0.0).b;\n"

327 " vec3 newColor = vec3(ResultR * oColor.r, ResultG * oColor.g, ResultB * oColor.b);\n"

328

329 " _MRTFRAGCOLOR0 = vec4(newColor, 1);\n"

330 " _MRTFRAGCOLOR1 = _MRTFRAGCOLOR0;\n"

331

332 " #ifdef _TEXELFETCHDECL\n"

333 // pixel luminance overdrive

334 " if(OverdriveScales_IsSrgb.x > 0.0)\n"

335 " {\n"

336 " ivec2 pixelCoord = ivec2(gl_FragCoord.x, gl_FragCoord.y);\n"

337 " vec3 oldColor = texelFetch(Texture1, pixelCoord, 0).rgb;\n"

338

339 " vec3 adjustedScales;\n"

340 " adjustedScales.x = newColor.x > oldColor.x ? OverdriveScales_IsSrgb.x : OverdriveScales_IsSrgb.y;\n"

341 " adjustedScales.y = newColor.y > oldColor.y ? OverdriveScales_IsSrgb.x : OverdriveScales_IsSrgb.y;\n"

342 " adjustedScales.z = newColor.z > oldColor.z ? OverdriveScales_IsSrgb.x : OverdriveScales_IsSrgb.y;\n"

343

344 // overdrive is tuned for gamma space so if we're in linear space fix gamma before doing the calculation

345 " vec3 overdriveColor;\n"

346 " if(OverdriveScales_IsSrgb.z > 0.0)\n"

347 " {\n"

348 " oldColor = pow(oldColor, vec3(1.0/2.2, 1.0/2.2, 1.0/2.2));\n"

349 " newColor = pow(newColor, vec3(1.0/2.2, 1.0/2.2, 1.0/2.2));\n"

350 " overdriveColor = clamp(newColor + (newColor - oldColor) * adjustedScales, 0.0, 1.0);\n"

351 " overdriveColor = pow(overdriveColor, vec3(2.2, 2.2, 2.2));\n"

352 " }\n"

353 " else\n"

354 " overdriveColor = clamp(newColor + (newColor - oldColor) * adjustedScales, 0.0, 1.0);\n"

355

356 " _MRTFRAGCOLOR1 = vec4(overdriveColor, 1.0);\n"

357 " }\n"

358 " #else\n"

359 // If statement to keep OverdriveScales_IsSrgb from being optimized out.

360 " if(OverdriveScales_IsSrgb.x > 0.0)\n"

361 " _MRTFRAGCOLOR1 = vec4(newColor, 1);\n"

362 " #endif\n"

363 "}\n";

364

365 const OVR::CAPI::GL::ShaderBase::Uniform DistortionChroma_ps_refl[] =

366 {

367 { "OverdriveScales_IsSrgb", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 12 },

368 };

369

370 static const char DistortionTimewarpChroma_vs[] =

371 "uniform vec2 EyeToSourceUVScale;\n"

372 "uniform vec2 EyeToSourceUVOffset;\n"

373 "uniform mat4 EyeRotationStart;\n"

374 "uniform mat4 EyeRotationEnd;\n"

375

376 "_VS_IN vec2 Position;\n"

377 "_VS_IN vec4 Color;\n"

378 "_VS_IN vec2 TexCoord0;\n"

379 "_VS_IN vec2 TexCoord1;\n"

380 "_VS_IN vec2 TexCoord2;\n"

381

382 "_VS_OUT vec4 oColor;\n"

383 "_VS_OUT vec2 oTexCoord0;\n"

384 "_VS_OUT vec2 oTexCoord1;\n"

385 "_VS_OUT vec2 oTexCoord2;\n"

386

387 "void main()\n"

388 "{\n"

389 " gl_Position.x = Position.x;\n"

390 " gl_Position.y = Position.y;\n"

391 " gl_Position.z = 0.0;\n"

392 " gl_Position.w = 1.0;\n"

393

394 // Vertex inputs are in TanEyeAngle space for the R,G,B channels (i.e. after chromatic aberration and distortion).

395 // These are now "real world" vectors in direction (x,y,1) relative to the eye of the HMD.

396 " vec3 TanEyeAngleR = vec3 ( TexCoord0.x, TexCoord0.y, 1.0 );\n"

397 " vec3 TanEyeAngleG = vec3 ( TexCoord1.x, TexCoord1.y, 1.0 );\n"

398 " vec3 TanEyeAngleB = vec3 ( TexCoord2.x, TexCoord2.y, 1.0 );\n"

399

400 // Accurate time warp lerp vs. faster

401 #if 1

402 // Apply the two 3x3 timewarp rotations to these vectors.

403 " vec3 TransformedRStart = (EyeRotationStart * vec4(TanEyeAngleR, 0)).xyz;\n"

404 " vec3 TransformedGStart = (EyeRotationStart * vec4(TanEyeAngleG, 0)).xyz;\n"

405 " vec3 TransformedBStart = (EyeRotationStart * vec4(TanEyeAngleB, 0)).xyz;\n"

406 " vec3 TransformedREnd = (EyeRotationEnd * vec4(TanEyeAngleR, 0)).xyz;\n"

407 " vec3 TransformedGEnd = (EyeRotationEnd * vec4(TanEyeAngleG, 0)).xyz;\n"

408 " vec3 TransformedBEnd = (EyeRotationEnd * vec4(TanEyeAngleB, 0)).xyz;\n"

409

410 // And blend between them.

411 " vec3 TransformedR = mix ( TransformedRStart, TransformedREnd, Color.a );\n"

412 " vec3 TransformedG = mix ( TransformedGStart, TransformedGEnd, Color.a );\n"

413 " vec3 TransformedB = mix ( TransformedBStart, TransformedBEnd, Color.a );\n"

414 #else

415 " mat3 EyeRotation;\n"

416 " EyeRotation[0] = mix ( EyeRotationStart[0], EyeRotationEnd[0], Color.a ).xyz;\n"

417 " EyeRotation[1] = mix ( EyeRotationStart[1], EyeRotationEnd[1], Color.a ).xyz;\n"

418 " EyeRotation[2] = mix ( EyeRotationStart[2], EyeRotationEnd[2], Color.a ).xyz;\n"

419 " vec3 TransformedR = EyeRotation * TanEyeAngleR;\n"

420 " vec3 TransformedG = EyeRotation * TanEyeAngleG;\n"

421 " vec3 TransformedB = EyeRotation * TanEyeAngleB;\n"

422 #endif

423

424 // Project them back onto the Z=1 plane of the rendered images.

425 " float RecipZR = 1.0 / TransformedR.z;\n"

426 " float RecipZG = 1.0 / TransformedG.z;\n"

427 " float RecipZB = 1.0 / TransformedB.z;\n"

428 " vec2 FlattenedR = vec2 ( TransformedR.x * RecipZR, TransformedR.y * RecipZR );\n"

429 " vec2 FlattenedG = vec2 ( TransformedG.x * RecipZG, TransformedG.y * RecipZG );\n"

430 " vec2 FlattenedB = vec2 ( TransformedB.x * RecipZB, TransformedB.y * RecipZB );\n"

431

432 // These are now still in TanEyeAngle space.

433 // Scale them into the correct [0-1],[0-1] UV lookup space (depending on eye)

434 " vec2 SrcCoordR = FlattenedR * EyeToSourceUVScale + EyeToSourceUVOffset;\n"

435 " vec2 SrcCoordG = FlattenedG * EyeToSourceUVScale + EyeToSourceUVOffset;\n"

436 " vec2 SrcCoordB = FlattenedB * EyeToSourceUVScale + EyeToSourceUVOffset;\n"

437

438 " oTexCoord0 = SrcCoordR;\n"

439 " oTexCoord1 = SrcCoordG;\n"

440 " oTexCoord2 = SrcCoordB;\n"

441

442 " oColor = vec4(Color.r, Color.r, Color.r, Color.r);\n" // Used for vignette fade.

443 "}\n";

444

445

446 const OVR::CAPI::GL::ShaderBase::Uniform DistortionTimewarpChroma_vs_refl[] =

447 {

448 { "EyeToSourceUVScale", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 0, 8 },

449 { "EyeToSourceUVOffset", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 8, 8 },

450 { "EyeRotationStart", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 16, 64 },

451 { "EyeRotationEnd", OVR::CAPI::GL::ShaderBase::VARTYPE_FLOAT, 80, 64 },

452 };

453

454 }}} // OVR::CAPI::GL

455

456 #endif // OVR_CAPI_GL_Shaders_h