blob: b3a71a4beb8d2c820ea00560aa25de4fe26ccf62 [file] [log] [blame]
// 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.
#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