Fix the blur so it is much prettier, by not sampling from a mipmap in the second...

diff --git a/blur_effect.cpp b/blur_effect.cpp
index 00c8fa093302ddfcef2367621a3cf085292d54f5..17044f12f35c54681148814f38efebac4d37f5e0 100644 (file)
--- a/blur_effect.cpp
+++ b/blur_effect.cpp
@@ -36,6 +36,16 @@ void BlurEffect::set_uniforms(GLuint glsl_program_num, const std::string &prefix
                pixel_size *= 2.0f;
        }       
 
+       // In the second pass, we do the same, but don't sample from a mipmap;
+       // that would re-blur the other direction in an ugly fashion, and we already
+       // have the vertical box blur we need from that pass.
+       //
+       // TODO: We really need to present horizontal+vertical as a unit;
+       // currently, there's really no guarantee vertical blur is the second pass.
+       if (direction == VERTICAL) {
+               base_mipmap_level = 0;
+       }
+
        glActiveTexture(GL_TEXTURE0);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, base_mipmap_level);
        check_error();