| // |
| // Copyright 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_TREEOPS_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_ |
| #define COMPILER_TRANSLATOR_TREEOPS_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_ |
| |
| #include "GLSLANG/ShaderLang.h" |
| #include "angle_gl.h" |
| #include "common/angleutils.h" |
| |
| namespace sh |
| { |
| |
| class TCompiler; |
| class TIntermBlock; |
| class TSymbolTable; |
| |
| ANGLE_NO_DISCARD bool DeclareAndInitBuiltinsForInstancedMultiview(TCompiler *compiler, |
| TIntermBlock *root, |
| unsigned numberOfViews, |
| GLenum shaderType, |
| ShCompileOptions compileOptions, |
| ShShaderOutput shaderOutput, |
| TSymbolTable *symbolTable); |
| |
| } // namespace sh |
| |
| #endif // COMPILER_TRANSLATOR_TREEOPS_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_ |