DeclareAndInitBuiltinsForInstancedMultiview.h (1952B)
1 // 2 // Copyright 2017 The ANGLE Project Authors. All rights reserved. 3 // Use of this source code is governed by a BSD-style license that can be 4 // found in the LICENSE file. 5 // 6 // Regardless of the shader type, the following AST transformations are applied: 7 // - Add declaration of View_ID_OVR. 8 // - Replace every occurrence of gl_ViewID_OVR with ViewID_OVR, mark ViewID_OVR as internal and 9 // declare it as a flat varying. 10 // 11 // If the shader type is a vertex shader, the following AST transformations are applied: 12 // - Replace every occurrence of gl_InstanceID with InstanceID, mark InstanceID as internal and set 13 // its qualifier to EvqTemporary. 14 // - Add initializers of ViewID_OVR and InstanceID to the beginning of the body of main. The pass 15 // should be executed before any variables get collected so that usage of gl_InstanceID is recorded. 16 // - If the output is ESSL or GLSL and the selectViewInNvGLSLVertexShader option is 17 // enabled, the expression 18 // "if (multiviewBaseViewLayerIndex < 0) { 19 // gl_ViewportIndex = int(ViewID_OVR); 20 // } else { 21 // gl_Layer = int(ViewID_OVR) + multiviewBaseViewLayerIndex; 22 // }" 23 // is added after ViewID and InstanceID are initialized. Also, MultiviewRenderPath is added as a 24 // uniform. 25 // 26 27 #ifndef COMPILER_TRANSLATOR_TREEOPS_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_ 28 #define COMPILER_TRANSLATOR_TREEOPS_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_ 29 30 #include "GLSLANG/ShaderLang.h" 31 #include "angle_gl.h" 32 #include "common/angleutils.h" 33 34 namespace sh 35 { 36 37 class TCompiler; 38 class TIntermBlock; 39 class TSymbolTable; 40 41 [[nodiscard]] bool DeclareAndInitBuiltinsForInstancedMultiview( 42 TCompiler *compiler, 43 TIntermBlock *root, 44 unsigned numberOfViews, 45 GLenum shaderType, 46 const ShCompileOptions &compileOptions, 47 ShShaderOutput shaderOutput, 48 TSymbolTable *symbolTable); 49 50 } // namespace sh 51 52 #endif // COMPILER_TRANSLATOR_TREEOPS_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_