1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "Extensions.h" 18 19 #include "Debug.h" 20 #include "Properties.h" 21 #include "utils/StringUtils.h" 22 23 #include <cutils/compiler.h> 24 25 #include <GLES2/gl2.h> 26 #include <GLES2/gl2ext.h> 27 28 #include <utils/Log.h> 29 30 namespace android { 31 namespace uirenderer { 32 33 Extensions::Extensions() { 34 if (Properties::isSkiaEnabled()) { 35 return; 36 } 37 const char* version = (const char*)glGetString(GL_VERSION); 38 39 // Section 6.1.5 of the OpenGL ES specification indicates the GL version 40 // string strictly follows this format: 41 // 42 // OpenGL<space>ES<space><version number><space><vendor-specific information> 43 // 44 // In addition section 6.1.5 describes the version number thusly: 45 // 46 // "The version number is either of the form major number.minor number or 47 // major number.minor number.release number, where the numbers all have one 48 // or more digits. The release number and vendor specific information are 49 // optional." 50 51 if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) { 52 // If we cannot parse the version number, assume OpenGL ES 2.0 53 mVersionMajor = 2; 54 mVersionMinor = 0; 55 } 56 57 auto extensions = StringUtils::split((const char*)glGetString(GL_EXTENSIONS)); 58 mHasNPot = extensions.has("GL_OES_texture_npot"); 59 mHasFramebufferFetch = extensions.has("GL_NV_shader_framebuffer_fetch"); 60 mHasDiscardFramebuffer = extensions.has("GL_EXT_discard_framebuffer"); 61 mHasDebugMarker = extensions.has("GL_EXT_debug_marker"); 62 mHas1BitStencil = extensions.has("GL_OES_stencil1"); 63 mHas4BitStencil = extensions.has("GL_OES_stencil4"); 64 mHasUnpackSubImage = extensions.has("GL_EXT_unpack_subimage"); 65 mHasRenderableFloatTexture = extensions.has("GL_OES_texture_half_float"); 66 67 mHasSRGB = mVersionMajor >= 3 || extensions.has("GL_EXT_sRGB"); 68 mHasSRGBWriteControl = extensions.has("GL_EXT_sRGB_write_control"); 69 70 #ifdef ANDROID_ENABLE_LINEAR_BLENDING 71 // If linear blending is enabled, the device must have (ES3.0 or EXT_sRGB) 72 // and EXT_sRGB_write_control 73 LOG_ALWAYS_FATAL_IF(!mHasSRGB, "Linear blending requires ES 3.0 or EXT_sRGB"); 74 LOG_ALWAYS_FATAL_IF(!mHasSRGBWriteControl, "Linear blending requires EXT_sRGB_write_control"); 75 76 mHasLinearBlending = true; 77 #else 78 mHasLinearBlending = false; 79 #endif 80 } 81 82 }; // namespace uirenderer 83 }; // namespace android 84
