From fc4cf7758b067ac93a79b3d360e2de6193a0c578 Mon Sep 17 00:00:00 2001
From: Pavel Krajcevski <pavel@cs.unc.edu>
Date: Thu, 30 Aug 2012 17:46:34 -0400
Subject: [PATCH] Add ability to change quality of BPTC encoder.

---
 CLTool/src/clunix.cpp  |  3 ++-
 Core/include/TexComp.h |  1 +
 Core/src/TexComp.cpp   | 21 ++++++++++++++++++++-
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/CLTool/src/clunix.cpp b/CLTool/src/clunix.cpp
index 0ec8d87..9ddb255 100644
--- a/CLTool/src/clunix.cpp
+++ b/CLTool/src/clunix.cpp
@@ -41,7 +41,7 @@ int main(int argc, char **argv) {
     if(strcmp(argv[fileArg], "-q") == 0) {
       fileArg++;
       
-      if(fileArg == argc || (quality = atoi(argv[fileArg])) < 1) {
+      if(fileArg == argc || (quality = atoi(argv[fileArg])) < 0) {
 	PrintUsage();
 	exit(1);
       }
@@ -62,6 +62,7 @@ int main(int argc, char **argv) {
   SCompressionSettings settings;
   settings.bUseSIMD = bUseSIMD;
   settings.iNumThreads = numThreads;
+  settings.iQuality = quality;
 
   CompressedImage *ci = CompressImage(file, settings);
 
diff --git a/Core/include/TexComp.h b/Core/include/TexComp.h
index e789bf0..e10fac1 100644
--- a/Core/include/TexComp.h
+++ b/Core/include/TexComp.h
@@ -9,6 +9,7 @@ struct SCompressionSettings {
   ECompressionFormat format; 
   bool bUseSIMD;
   int iNumThreads;
+  int iQuality;
 };
 
 extern CompressedImage * CompressImage(
diff --git a/Core/src/TexComp.cpp b/Core/src/TexComp.cpp
index a395957..7792d5a 100644
--- a/Core/src/TexComp.cpp
+++ b/Core/src/TexComp.cpp
@@ -5,16 +5,35 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+template <typename T>
+static T min(const T &a, const T &b) {
+  return (a < b)? a : b;
+}
+
+template <typename T>
+static T max(const T &a, const T &b) {
+  return (a > b)? a : b;
+}
+
+template <typename T>
+static void clamp(T &x, const T &minX, const T &maxX) {
+  x = max(min(maxX, x), minX);
+}
+
 SCompressionSettings:: SCompressionSettings()
   : format(eCompressionFormat_BPTC)
   , bUseSIMD(false)
   , iNumThreads(1)
-{}
+  , iQuality(50)
+{
+  clamp(iQuality, 0, 256);
+}
 
 static CompressionFunc ChooseFuncFromSettings(const SCompressionSettings &s) {
   switch(s.format) {
     case eCompressionFormat_BPTC:
     {
+      BC7C::SetQualityLevel(s.iQuality);
       if(s.bUseSIMD) {
 	return BC7C::CompressImageBC7SIMD;
       }