webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 109 insertions, 0 deletions

diff --git a/Source/ThirdParty/ANGLE/src/compiler/translator/TranslatorESSL.cpp b/Source/ThirdParty/ANGLE/src/compiler/translator/TranslatorESSL.cpp
new file mode 100644
index 000000000..109b1700d
--- /dev/null
+++ b/Source/ThirdParty/ANGLE/src/compiler/translator/TranslatorESSL.cpp
@@ -0,0 +1,109 @@
+//
+// Copyright (c) 2002-2013 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.
+//
+
+#include "compiler/translator/TranslatorESSL.h"
+
+#include "compiler/translator/EmulatePrecision.h"
+#include "compiler/translator/RecordConstantPrecision.h"
+#include "compiler/translator/OutputESSL.h"
+#include "angle_gl.h"
+
+TranslatorESSL::TranslatorESSL(sh::GLenum type, ShShaderSpec spec)
+    : TCompiler(type, spec, SH_ESSL_OUTPUT)
+{
+}
+
+void TranslatorESSL::translate(TIntermNode *root, ShCompileOptions compileOptions)
+{
+    TInfoSinkBase& sink = getInfoSink().obj;
+
+    int shaderVer = getShaderVersion();
+    if (shaderVer > 100)
+    {
+        sink << "#version " << shaderVer << " es\n";
+    }
+
+    // Write built-in extension behaviors.
+    writeExtensionBehavior();
+
+    // Write pragmas after extensions because some drivers consider pragmas
+    // like non-preprocessor tokens.
+    writePragma(compileOptions);
+
+    bool precisionEmulation = getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
+
+    if (precisionEmulation)
+    {
+        EmulatePrecision emulatePrecision(getSymbolTable(), shaderVer);
+        root->traverse(&emulatePrecision);
+        emulatePrecision.updateTree();
+        emulatePrecision.writeEmulationHelpers(sink, shaderVer, SH_ESSL_OUTPUT);
+    }
+
+    RecordConstantPrecision(root, getTemporaryIndex());
+
+    // Write emulated built-in functions if needed.
+    if (!getBuiltInFunctionEmulator().IsOutputEmpty())
+    {
+        sink << "// BEGIN: Generated code for built-in function emulation\n\n";
+        if (getShaderType() == GL_FRAGMENT_SHADER)
+        {
+            sink << "#if defined(GL_FRAGMENT_PRECISION_HIGH)\n"
+                 << "#define webgl_emu_precision highp\n"
+                 << "#else\n"
+                 << "#define webgl_emu_precision mediump\n"
+                 << "#endif\n\n";
+        }
+        else
+        {
+            sink << "#define webgl_emu_precision highp\n";
+        }
+
+        getBuiltInFunctionEmulator().OutputEmulatedFunctions(sink);
+        sink << "// END: Generated code for built-in function emulation\n\n";
+    }
+
+    // Write array bounds clamping emulation if needed.
+    getArrayBoundsClamper().OutputClampingFunctionDefinition(sink);
+
+    if (getShaderType() == GL_COMPUTE_SHADER && isComputeShaderLocalSizeDeclared())
+    {
+        const sh::WorkGroupSize &localSize = getComputeShaderLocalSize();
+        sink << "layout (local_size_x=" << localSize[0] << ", local_size_y=" << localSize[1]
+             << ", local_size_z=" << localSize[2] << ") in;\n";
+    }
+
+    // Write translated shader.
+    TOutputESSL outputESSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(),
+                           getSymbolTable(), shaderVer, precisionEmulation);
+    root->traverse(&outputESSL);
+}
+
+bool TranslatorESSL::shouldFlattenPragmaStdglInvariantAll()
+{
+    // Not necessary when translating to ESSL.
+    return false;
+}
+
+void TranslatorESSL::writeExtensionBehavior() {
+    TInfoSinkBase& sink = getInfoSink().obj;
+    const TExtensionBehavior& extBehavior = getExtensionBehavior();
+    for (TExtensionBehavior::const_iterator iter = extBehavior.begin();
+         iter != extBehavior.end(); ++iter) {
+        if (iter->second != EBhUndefined) {
+            if (getResources().NV_shader_framebuffer_fetch && iter->first == "GL_EXT_shader_framebuffer_fetch") {
+                sink << "#extension GL_NV_shader_framebuffer_fetch : "
+                     << getBehaviorString(iter->second) << "\n";
+            } else if (getResources().NV_draw_buffers && iter->first == "GL_EXT_draw_buffers") {
+                sink << "#extension GL_NV_draw_buffers : "
+                     << getBehaviorString(iter->second) << "\n";
+            } else {
+                sink << "#extension " << iter->first << " : "
+                     << getBehaviorString(iter->second) << "\n";
+            }
+        }
+    }
+}