+/*
+ * Copyright (c) 2023 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// CLASS HEADER
+#include <dali/internal/graphics/gles/gl-implementation.h>
+
+namespace Dali
+{
+namespace Internal
+{
+namespace Adaptor
+{
+namespace
+{
+static constexpr int32_t INITIAL_GLES_VERSION = 30;
+static constexpr int32_t GLES_VERSION_SUPPORT_BLEND_EQUATION_ADVANCED = 32;
+
+static constexpr int32_t MINIMUM_GLES_VERSION_GET_MAXIMUM_MULTISAMPLES_TO_TEXTURE = 30;
+
+static constexpr const char* LEGACY_SHADING_LANGUAGE_VERSION = "100";
+
+static constexpr const char* DEFAULT_SAMPLER_TYPE = "sampler2D";
+
+static constexpr const char* FRAGMENT_SHADER_ADVANCED_BLEND_EQUATION_PREFIX =
+ "#ifdef GL_KHR_blend_equation_advanced\n"
+ "#extension GL_KHR_blend_equation_advanced : enable\n"
+ "#endif\n"
+
+ "#if defined(GL_KHR_blend_equation_advanced) || __VERSION__>=320\n"
+ " layout(blend_support_all_equations) out;\n"
+ "#endif\n";
+
+static constexpr const char* FRAGMENT_SHADER_OUTPUT_COLOR_STRING =
+ "out mediump vec4 fragColor;\n";
+
+static constexpr const char* OES_EGL_IMAGE_EXTERNAL_STRING = "#extension GL_OES_EGL_image_external:require\n";
+
+static constexpr const char* OES_EGL_IMAGE_EXTERNAL_STRING_ESSL3 = "#extension GL_OES_EGL_image_external_essl3:require\n";
+
+// Threshold time in miliseconds
+constexpr auto PERFORMANCE_LOG_THRESHOLD_TIME_ENV = "DALI_EGL_PERFORMANCE_LOG_THRESHOLD_TIME";
+
+static uint32_t GetPerformanceLogThresholdTime()
+{
+ auto timeString = Dali::EnvironmentVariable::GetEnvironmentVariable(PERFORMANCE_LOG_THRESHOLD_TIME_ENV);
+ uint32_t time = timeString ? static_cast<uint32_t>(std::atoi(timeString)) : 0u;
+ return time;
+}
+} // namespace
+
+GlImplementation::GlImplementation()
+: mGlExtensionSupportedCacheList(),
+ mContextCreatedWaitCondition(),
+ mMaxTextureSize(0),
+ mMaxTextureSamples(0),
+ mVertexShaderPrefix(""),
+ mGlesVersion(INITIAL_GLES_VERSION),
+ mShadingLanguageVersion(100),
+ mShadingLanguageVersionCached(false),
+ mIsSurfacelessContextSupported(false),
+ mIsContextCreated(false)
+{
+ mImpl.reset(new Gles3Implementation());
+}
+
+void GlImplementation::ContextCreated()
+{
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
+
+ // Since gles 2.0 didn't return well for GL_MAJOR_VERSION and GL_MINOR_VERSION,
+ // Only change gles version for the device that support above gles 3.0.
+ if(mGlesVersion >= INITIAL_GLES_VERSION)
+ {
+ GLint majorVersion, minorVersion;
+ glGetIntegerv(GL_MAJOR_VERSION, &majorVersion);
+ glGetIntegerv(GL_MINOR_VERSION, &minorVersion);
+ mGlesVersion = majorVersion * 10 + minorVersion;
+ }
+
+ if(mGlesVersion >= GLES_VERSION_SUPPORT_BLEND_EQUATION_ADVANCED)
+ {
+ SetIsAdvancedBlendEquationSupported(true);
+ }
+
+ if(mGlExtensionSupportedCacheList.NeedFullCheck())
+ {
+ // fully check gl extensions if we miss some extension supported
+ mGlExtensionSupportedCacheList.EnsureGlExtensionSupportedCheck();
+ }
+
+ if(IsMultisampledRenderToTextureSupported())
+ {
+ mMaxTextureSamples = 0;
+
+ if(mGlesVersion >= MINIMUM_GLES_VERSION_GET_MAXIMUM_MULTISAMPLES_TO_TEXTURE)
+ {
+ // Try to get maximum FBO MSAA sampling level from GL_RENDERBUFFER first.
+ // If false, than ask again to GL_MAX_SAMPLES_EXT.
+ GetInternalformativ(GL_RENDERBUFFER, GL_RGBA8, GL_SAMPLES, 1, &mMaxTextureSamples);
+ }
+ if(mMaxTextureSamples == 0)
+ {
+ glGetIntegerv(GL_MAX_SAMPLES_EXT, &mMaxTextureSamples);
+ }
+ }
+
+ if(!mShadingLanguageVersionCached)
+ {
+ std::istringstream shadingLanguageVersionStream(reinterpret_cast<const char*>(glGetString(GL_SHADING_LANGUAGE_VERSION)));
+ std::string token;
+ uint32_t tokenCount = 0;
+ while(std::getline(shadingLanguageVersionStream, token, ' '))
+ {
+ if(tokenCount == 3 && token == "ES")
+ {
+ std::getline(shadingLanguageVersionStream, token, '.');
+ mShadingLanguageVersion = std::atoi(token.c_str());
+ mShadingLanguageVersion *= 100;
+ std::getline(shadingLanguageVersionStream, token, '.');
+ mShadingLanguageVersion += std::atoi(token.c_str());
+ break;
+ }
+ tokenCount++;
+ }
+ }
+
+ mLogThreshold = GetPerformanceLogThresholdTime();
+ mLogEnabled = mLogThreshold > 0 ? true : false;
+
+ {
+ ConditionalWait::ScopedLock lock(mContextCreatedWaitCondition);
+ mIsContextCreated = true;
+ mContextCreatedWaitCondition.Notify(lock);
+ }
+}
+
+std::string GlImplementation::GetFragmentShaderPrefix()
+{
+ if(mFragmentShaderPrefix == "")
+ {
+ mFragmentShaderPrefix = GetShaderVersionPrefix();
+
+ if(GetShadingLanguageVersion() < 300)
+ {
+ mFragmentShaderPrefix += "#define INPUT varying\n";
+ mFragmentShaderPrefix += "#define OUT_COLOR gl_FragColor\n";
+ mFragmentShaderPrefix += "#define TEXTURE texture2D\n";
+ }
+ else
+ {
+ mFragmentShaderPrefix += "#define INPUT in\n";
+ mFragmentShaderPrefix += "#define OUT_COLOR fragColor\n";
+ mFragmentShaderPrefix += "#define TEXTURE texture\n";
+
+ if(IsAdvancedBlendEquationSupported())
+ {
+ mFragmentShaderPrefix += FRAGMENT_SHADER_ADVANCED_BLEND_EQUATION_PREFIX;
+ }
+
+ mFragmentShaderPrefix += FRAGMENT_SHADER_OUTPUT_COLOR_STRING;
+ }
+ }
+ return mFragmentShaderPrefix;
+}
+
+bool GlImplementation::ApplyNativeFragmentShader(std::string& shader, const char* customSamplerType)
+{
+ bool modified = false;
+ std::string versionString = "#version";
+ size_t versionPosition = shader.find(versionString);
+ if(versionPosition != std::string::npos)
+ {
+ std::string extensionString;
+ size_t shadingLanguageVersionPosition = shader.find_first_not_of(" \t", versionPosition + versionString.length());
+ if(shadingLanguageVersionPosition != std::string::npos &&
+ shader.substr(shadingLanguageVersionPosition, 3) == LEGACY_SHADING_LANGUAGE_VERSION)
+ {
+ extensionString = OES_EGL_IMAGE_EXTERNAL_STRING;
+ }
+ else
+ {
+ extensionString = OES_EGL_IMAGE_EXTERNAL_STRING_ESSL3;
+ }
+
+ if(shader.find(extensionString) == std::string::npos)
+ {
+ modified = true;
+ size_t extensionPosition = shader.find_first_of("\n", versionPosition) + 1;
+ shader.insert(extensionPosition, extensionString);
+ }
+ }
+ else
+ {
+ if(shader.find(OES_EGL_IMAGE_EXTERNAL_STRING) == std::string::npos)
+ {
+ modified = true;
+ shader = OES_EGL_IMAGE_EXTERNAL_STRING + shader;
+ }
+ }
+
+ if(shader.find(customSamplerType) == std::string::npos)
+ {
+ size_t pos = shader.find(DEFAULT_SAMPLER_TYPE);
+ if(pos != std::string::npos)
+ {
+ modified = true;
+ shader.replace(pos, strlen(DEFAULT_SAMPLER_TYPE), customSamplerType);
+ }
+ }
+
+ return modified;
+}
+
+} // namespace Adaptor
+
+} // namespace Internal
+
+} // namespace Dali