Added the immutable parameter.

include/GLES2/gl2ext.h

@@ -336,6 +336,11 @@ typedef void* GLeglImageOES;
 #define GL_NO_RESET_NOTIFICATION_EXT                            0x8261
 #endif
 
+/* GL_EXT_texture_storage */
+#ifndef GL_EXT_texture_storage
+#define GL_TEXTURE_IMMUTABLE_FORMAT_EXT                         0x912F
+#endif
+
 /*------------------------------------------------------------------------*
  * DMP extension tokens
  *------------------------------------------------------------------------*/
@@ -951,6 +956,11 @@ GL_APICALL GLenum GL_APIENTRY glGetGraphicsResetStatusEXT (void);
 typedef GLenum (GL_APIENTRYP PFNGLGETGRAPHICSRESETSTATUSEXTPROC) (void);
 #endif
 
+/* GL_EXT_texture_storage */
+#ifndef GL_EXT_texture_storage
+#define GL_EXT_texture_storage 1
+#endif
+
 /*------------------------------------------------------------------------*
  * DMP extension functions
  *------------------------------------------------------------------------*/

src/libGLESv2/Texture.cpp

@@ -1231,6 +1231,8 @@ Texture::Texture(GLuint id) : RefCountObject(id)
     mDirtyParameters = true;
     
     mDirtyImages = true;
+
+    mImmutable = false;
 }
 
 Texture::~Texture()
@@ -1506,6 +1508,11 @@ unsigned int Texture::getRenderTargetSerial(GLenum target) const
     return texture ? texture->getRenderTargetSerial(target) : 0;
 }
 
+bool Texture::isImmutable() const
+{
+    return mImmutable;
+}
+
 GLint Texture::creationLevels(GLsizei width, GLsizei height) const
 {
     if ((isPow2(width) && isPow2(height)) || getContext()->supportsNonPower2Texture())

src/libGLESv2/Texture.h

@@ -197,6 +197,8 @@ class Texture : public RefCountObject
     unsigned int getTextureSerial() const;
     unsigned int getRenderTargetSerial(GLenum target) const;
 
+    bool isImmutable() const;
+
     static const GLuint INCOMPLETE_TEXTURE_ID = static_cast<GLuint>(-1);   // Every texture takes an id at creation time. The value is arbitrary because it is never registered with the resource manager.
 
   protected:
@@ -228,6 +230,8 @@ class Texture : public RefCountObject
 
     bool mDirtyImages;
 
+    bool mImmutable;
+
   private:
     DISALLOW_COPY_AND_ASSIGN(Texture);
 

src/libGLESv2/libGLESv2.cpp

@@ -3338,6 +3338,9 @@ void __stdcall glGetTexParameterfv(GLenum target, GLenum pname, GLfloat* params)
               case GL_TEXTURE_WRAP_T:
                 *params = (GLfloat)texture->getWrapT();
                 break;
+              case GL_TEXTURE_IMMUTABLE_FORMAT_EXT:
+                *params = (GLfloat)(texture->isImmutable() ? GL_TRUE : GL_FALSE);
+                break;
               default:
                 return error(GL_INVALID_ENUM);
             }
@@ -3387,6 +3390,9 @@ void __stdcall glGetTexParameteriv(GLenum target, GLenum pname, GLint* params)
               case GL_TEXTURE_WRAP_T:
                 *params = texture->getWrapT();
                 break;
+              case GL_TEXTURE_IMMUTABLE_FORMAT_EXT:
+                *params = texture->isImmutable() ? GL_TRUE : GL_FALSE;
+                break;
               default:
                 return error(GL_INVALID_ENUM);
             }