igl | android | Support sRGB framebuffer on OpenGLES.

build/android/app/src/main/java/com/facebook/igl/sample/SampleLib.java

@@ -60,6 +60,8 @@ public static native void init(
 
   public static native void setClearColorValue(float r, float g, float b, float a);
 
+  public static native boolean isSRGBTextureFormat(int textureFormat);
+
   public static native void surfaceDestroyed(Surface surface);
 
   public static class RenderSessionConfig {

build/android/app/src/main/java/com/facebook/igl/sample/SampleView.java

@@ -19,6 +19,7 @@
 import javax.microedition.khronos.egl.EGLConfig;
 import javax.microedition.khronos.egl.EGLContext;
 import javax.microedition.khronos.egl.EGLDisplay;
+import javax.microedition.khronos.egl.EGLSurface;
 import javax.microedition.khronos.opengles.GL10;
 
 /// Simple view that sets up a GLES 2.0 rendering context
@@ -39,6 +40,8 @@ public SampleView(
     // Set the view to be transluscent since we provide an alpha channel below.
     this.getHolder().setFormat(PixelFormat.TRANSLUCENT);
 
+    setEGLWindowSurfaceFactory(new SurfaceFactory(SampleLib.isSRGBTextureFormat(swapchainColorTextureFormat)));
+
     setEGLConfigChooser(new ConfigChooser(backendVersion));
 
     setRenderer(new Renderer(context, backendVersion, swapchainColorTextureFormat));
@@ -112,6 +115,33 @@ private static void checkEglError(String prompt, EGL10 egl) {
     }
   }
 
+  private static class SurfaceFactory implements GLSurfaceView.EGLWindowSurfaceFactory{
+    final int EGL_GL_COLORSPACE_KHR = 0x309D;
+    final int EGL_GL_COLORSPACE_SRGB_KHR = 0x3089;
+    final int EGL_GL_COLORSPACE_LINEAR_KHR = 0x308A;
+
+    private boolean mIsSRGBColorSpace;
+
+    SurfaceFactory(boolean isSRGB){
+      mIsSRGBColorSpace = isSRGB;
+    }
+
+    @Override
+    public EGLSurface createWindowSurface(EGL10 egl10, EGLDisplay eglDisplay, EGLConfig eglConfig, Object nativeWindow) {
+      int[] configAttribs = {
+              EGL_GL_COLORSPACE_KHR , (mIsSRGBColorSpace ? EGL_GL_COLORSPACE_SRGB_KHR : EGL_GL_COLORSPACE_LINEAR_KHR),
+              EGL10.EGL_NONE
+      };
+
+      return egl10.eglCreateWindowSurface(eglDisplay, eglConfig, nativeWindow, configAttribs);
+    }
+
+    @Override
+    public void destroySurface(EGL10 egl10, EGLDisplay eglDisplay, EGLSurface eglSurface) {
+      egl10.eglDestroySurface(eglDisplay, eglSurface);
+    }
+  }
+
   /// Config chooser: handles specifying the requirements for the EGL config and choosing the
   // correct one.
   private static class ConfigChooser implements GLSurfaceView.EGLConfigChooser {

shell/android/jni/Jni.cpp

@@ -203,6 +203,11 @@ JNIEXPORT void JNICALL Java_com_facebook_igl_shell_SampleLib_setClearColorValue(
                                                                                 jfloat g,
                                                                                 jfloat b,
                                                                                 jfloat a);
+
+JNIEXPORT bool JNICALL Java_com_facebook_igl_shell_SampleLib_isSRGBTextureFormat(JNIEnv* env,
+                                                                                 jobject obj,
+                                                                                 int textureFormat);
+
 };
 
 JNIEXPORT jobjectArray JNICALL
@@ -365,4 +370,10 @@ JNIEXPORT void JNICALL Java_com_facebook_igl_shell_SampleLib_setClearColorValue(
   renderers[*activeRendererIndex]->setClearColorValue(r, g, b, a);
 }
 
+JNIEXPORT bool JNICALL Java_com_facebook_igl_shell_SampleLib_isSRGBTextureFormat(JNIEnv* env,
+                                                                                 jobject obj,
+                                                                                 int textureFormat){
+    return textureFormat == (int)igl::TextureFormat::RGBA_SRGB || textureFormat == (int)igl::TextureFormat::BGRA_SRGB;
+}
+
 } // namespace igl::samples