Merge "Change the dither texture's swizzling" into jb-mr2-dev

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

        if (useFloatTexture) {

            // We use a R16F texture, let's remap the alpha channel to the

            // red channel to avoid changing the shader sampling code on GL ES 3.0+

            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_A, GL_RED);

            float dither = 1.0f / (255.0f * DITHER_KERNEL_SIZE * DITHER_KERNEL_SIZE);

            const GLfloat pattern[] = {

                 0 * dither,  8 * dither,  2 * dither, 10 * dither,

        // ES 2.0

        "texture2D(ditherSampler, ditherTexCoords).a * " STR(DITHER_KERNEL_SIZE_INV_SQUARE),

        // ES 3.0

        "texture2D(ditherSampler, ditherTexCoords).r"

        "texture2D(ditherSampler, ditherTexCoords).a"

};

const char* gFS_Main_AddDitherToGradient =

        "    gradientColor += %s;\n";