kc3-lang/angle/src/compiler/translator/DeclareAndInitBuiltinsForInstancedMultiview.h

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• Hash : 4e619f58
  Author :
  Date : 2017-08-09T11:50:06
  

  Add branch for viewport or layer selection in VS
  
  The patch extends the behavior of
  SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER so that either the viewport
  or layer is selected based on the value of the internal uniform variable
  MultiviewRenderPath.
  
  BUG=angleproject:2062
  TEST=angle_end2end_tests
  TEST=angle_unittests
  
  Change-Id: Ia311b12b1fed642dac78eba8732e2535242f34fd
  Reviewed-on: https://chromium-review.googlesource.com/615260
  Commit-Queue: Martin Radev <mradev@nvidia.com>
  Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/compiler/translator/DeclareAndInitBuiltinsForInstancedMultiview.h

• //
  // Copyright (c) 2017 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // Regardless of the shader type, the following AST transformations are applied:
  // - Add declaration of View_ID_OVR.
  // - Replace every occurrence of gl_ViewID_OVR with ViewID_OVR, mark ViewID_OVR as internal and
  // declare it as a flat varying.
  //
  // If the shader type is a vertex shader, the following AST transformations are applied:
  // - Replace every occurrence of gl_InstanceID with InstanceID, mark InstanceID as internal and set
  // its qualifier to EvqTemporary.
  // - Add initializers of ViewID_OVR and InstanceID to the beginning of the body of main. The pass
  // should be executed before any variables get collected so that usage of gl_InstanceID is recorded.
  // - If the output is ESSL or GLSL and the SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER option is
  // enabled, the expression
  // "if (multiviewBaseViewLayerIndex < 0) {
  //      gl_ViewportIndex = int(ViewID_OVR);
  //  } else {
  //      gl_Layer = int(ViewID_OVR) + multiviewBaseViewLayerIndex;
  //  }"
  // is added after ViewID and InstanceID are initialized. Also, MultiviewRenderPath is added as a
  // uniform.
  //
  
  #ifndef COMPILER_TRANSLATOR_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_
  #define COMPILER_TRANSLATOR_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_
  
  #include "GLSLANG/ShaderLang.h"
  #include "angle_gl.h"
  
  namespace sh
  {
  
  class TIntermBlock;
  class TSymbolTable;
  
  void DeclareAndInitBuiltinsForInstancedMultiview(TIntermBlock *root,
                                                   unsigned numberOfViews,
                                                   GLenum shaderType,
                                                   ShCompileOptions compileOptions,
                                                   ShShaderOutput shaderOutput,
                                                   TSymbolTable *symbolTable);
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_

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