Replace API queries of immutable texture level count with a specialized function.

src/libGLESv2/Texture.cpp

@@ -329,6 +329,11 @@ bool Texture::isImmutable() const
     return mImmutable;
 }
 
+int Texture::immutableLevelCount()
+{
+    return (mImmutable ? getNativeTexture()->getStorageInstance()->levelCount() : 0);
+}
+
 GLint Texture::creationLevels(GLsizei width, GLsizei height, GLsizei depth) const
 {
     // NPOT checks are not required in ES 3.0, NPOT texture support is assumed.

src/libGLESv2/Texture.h

@@ -88,7 +88,6 @@ class Texture : public RefCountObject
     int getLodOffset();
     void getSamplerState(SamplerState *sampler);
     GLenum getUsage() const;
-    virtual int levelCount() = 0;
 
     GLint getBaseLevelWidth() const;
     GLint getBaseLevelHeight() const;
@@ -108,6 +107,7 @@ class Texture : public RefCountObject
     unsigned int getTextureSerial();
 
     bool isImmutable() const;
+    int immutableLevelCount();
 
     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.
 

src/libGLESv2/libGLESv2.cpp

@@ -3739,7 +3739,7 @@ void __stdcall glGetTexParameterfv(GLenum target, GLenum pname, GLfloat* params)
                 {
                     return gl::error(GL_INVALID_ENUM);
                 }
-                *params = (GLfloat)(texture->isImmutable() ? texture->levelCount() : 0);
+                *params = (GLfloat)texture->immutableLevelCount();
                 break;
               case GL_TEXTURE_USAGE_ANGLE:
                 *params = (GLfloat)texture->getUsage();
@@ -3809,7 +3809,7 @@ void __stdcall glGetTexParameteriv(GLenum target, GLenum pname, GLint* params)
                 {
                     return gl::error(GL_INVALID_ENUM);
                 }
-                *params = texture->isImmutable() ? texture->levelCount() : 0;
+                *params = texture->immutableLevelCount();
                 break;
               case GL_TEXTURE_USAGE_ANGLE:
                 *params = texture->getUsage();