diff --git a/engine/common/build.c b/engine/common/build.c
index 6e99ff95..6cf91622 100644
--- a/engine/common/build.c
+++ b/engine/common/build.c
@@ -48,7 +48,7 @@ int Q_buildnum( void )
 
 	return b;
 #else
-	return 4511;
+	return 4529;
 #endif
 }
 
diff --git a/ref_gl/gl_export.h b/ref_gl/gl_export.h
index a30b8903..a9cd3af8 100644
--- a/ref_gl/gl_export.h
+++ b/ref_gl/gl_export.h
@@ -398,6 +398,7 @@ typedef float GLmatrix[16];
 #define GL_COMPRESSED_RGBA_S3TC_DXT3_EXT	0x83F2
 #define GL_COMPRESSED_RGBA_S3TC_DXT5_EXT	0x83F3
 #define GL_COMPRESSED_RED_GREEN_RGTC2_EXT	0x8DBD
+#define GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI	0x8837
 #define GL_COMPRESSED_ALPHA_ARB		0x84E9
 #define GL_COMPRESSED_LUMINANCE_ARB		0x84EA
 #define GL_COMPRESSED_LUMINANCE_ALPHA_ARB	0x84EB
diff --git a/ref_gl/gl_image.c b/ref_gl/gl_image.c
index ace6a441..ffb61e8c 100644
--- a/ref_gl/gl_image.c
+++ b/ref_gl/gl_image.c
@@ -396,6 +396,8 @@ static size_t GL_CalcTextureSize( GLenum format, int width, int height, int dept
 	case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 	case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 	case GL_COMPRESSED_RED_GREEN_RGTC2_EXT:
+	case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
+	case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 		size = (((width + 3) >> 2) * ((height + 3) >> 2) * 16) * depth;
 		break;
 	case GL_RGBA8:
@@ -451,10 +453,14 @@ static size_t GL_CalcTextureSize( GLenum format, int width, int height, int dept
 		size = width * height * depth * 8;
 		break;
 	case GL_RGB16F_ARB:
+		size = width * height * depth * 6;
+		break;
 	case GL_RGBA16F_ARB:
 		size = width * height * depth * 8;
 		break;
 	case GL_RGB32F_ARB:
+		size = width * height * depth * 12;
+		break;
 	case GL_RGBA32F_ARB:
 		size = width * height * depth * 16;
 		break;
@@ -661,7 +667,11 @@ static void GL_SetTextureFormat( gl_texture_t *tex, pixformat_t format, int chan
 		case PF_DXT1: tex->format = GL_COMPRESSED_RGB_S3TC_DXT1_EXT; break;	// never use DXT1 with 1-bit alpha
 		case PF_DXT3: tex->format = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT; break;
 		case PF_DXT5: tex->format = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT; break;
-		case PF_ATI2: tex->format = GL_COMPRESSED_RED_GREEN_RGTC2_EXT; break;
+		case PF_ATI2:
+			if( glConfig.hardware_type == GLHW_RADEON )
+				tex->format = GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI;
+			else tex->format = GL_COMPRESSED_RED_GREEN_RGTC2_EXT;
+			break;
 		}
 		return;
 	}
@@ -2046,6 +2056,7 @@ void R_TextureList_f( void )
 			gEngfuncs.Con_Printf( "DXT5  " );
 			break;
 		case GL_COMPRESSED_RED_GREEN_RGTC2_EXT:
+		case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 			gEngfuncs.Con_Printf( "ATI2  " );
 			break;
 		case GL_RGBA: