Checks that the GL_NV_framebuffer_multisample_coverage extension is available.

Usage: glRenderbufferStorageMultisampleCoverageNV target coverageSamples colorSamples internalformat width height

The parameter target is a RenderbufferTarget.

The parameter internalformat is a InternalFormat, one of: GL_ALPHA12, GL_ALPHA16, GL_ALPHA16_ICC_SGIX, GL_ALPHA4, GL_ALPHA8, GL_ALPHA_ICC_SGIX, GL_DEPTH_COMPONENT16_SGIX, GL_DEPTH_COMPONENT24_SGIX, GL_DEPTH_COMPONENT32_SGIX, GL_DUAL_ALPHA12_SGIS, GL_DUAL_ALPHA16_SGIS, GL_DUAL_ALPHA4_SGIS, GL_DUAL_ALPHA8_SGIS, GL_DUAL_INTENSITY12_SGIS, GL_DUAL_INTENSITY16_SGIS, GL_DUAL_INTENSITY4_SGIS, GL_DUAL_INTENSITY8_SGIS, GL_DUAL_LUMINANCE12_SGIS, GL_DUAL_LUMINANCE16_SGIS, GL_DUAL_LUMINANCE4_SGIS, GL_DUAL_LUMINANCE8_SGIS, GL_DUAL_LUMINANCE_ALPHA4_SGIS, GL_DUAL_LUMINANCE_ALPHA8_SGIS, GL_INTENSITY, GL_INTENSITY12, GL_INTENSITY16, GL_INTENSITY16_ICC_SGIX, GL_INTENSITY4, GL_INTENSITY8, GL_INTENSITY_ICC_SGIX, GL_LUMINANCE12, GL_LUMINANCE12_ALPHA12, GL_LUMINANCE12_ALPHA4, GL_LUMINANCE16, GL_LUMINANCE16_ALPHA16, GL_LUMINANCE16_ALPHA8_ICC_SGIX, GL_LUMINANCE16_ICC_SGIX, GL_LUMINANCE4, GL_LUMINANCE4_ALPHA4, GL_LUMINANCE6_ALPHA2, GL_LUMINANCE8, GL_LUMINANCE8_ALPHA8, GL_LUMINANCE_ALPHA_ICC_SGIX, GL_LUMINANCE_ICC_SGIX, GL_QUAD_ALPHA4_SGIS, GL_QUAD_ALPHA8_SGIS, GL_QUAD_INTENSITY4_SGIS, GL_QUAD_INTENSITY8_SGIS, GL_QUAD_LUMINANCE4_SGIS, GL_QUAD_LUMINANCE8_SGIS, GL_R3_G3_B2, GL_R5_G6_B5_A8_ICC_SGIX, GL_R5_G6_B5_ICC_SGIX, GL_RGB10, GL_RGB10_A2, GL_RGB12, GL_RGB16, GL_RGB2_EXT, GL_RGB4, GL_RGB5, GL_RGB5_A1, GL_RGB8, GL_RGBA12, GL_RGBA16, GL_RGBA2, GL_RGBA4, GL_RGBA8, GL_RGBA_ICC_SGIX, GL_RGB_ICC_SGIX.