Config: Add "maxTextureSize" entry to artificially limit texture sizes

src/config.cpp

@@ -166,6 +166,7 @@ void Config::read(int argc, char *argv[])
 	PO_DESC(syncToRefreshrate, bool, false) \
 	PO_DESC(solidFonts, bool, false) \
 	PO_DESC(subImageFix, bool, false) \
+	PO_DESC(maxTextureSize, int, 0) \
 	PO_DESC(gameFolder, std::string, ".") \
 	PO_DESC(anyAltToggleFS, bool, false) \
 	PO_DESC(enableReset, bool, true) \

src/config.h

@@ -49,6 +49,7 @@ struct Config
 	bool solidFonts;
 
 	bool subImageFix;
+	int maxTextureSize;
 
 	std::string gameFolder;
 	bool anyAltToggleFS;

src/glstate.cpp

@@ -23,6 +23,7 @@
 #include "shader.h"
 #include "etc.h"
 #include "gl-fun.h"
+#include "config.h"
 
 #include <SDL_rect.h>
 
@@ -111,7 +112,7 @@ GLState::Caps::Caps()
 	gl.GetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTexSize);
 }
 
-GLState::GLState()
+GLState::GLState(const Config &conf)
 {
 	gl.Disable(GL_DEPTH_TEST);
 
@@ -121,4 +122,7 @@ GLState::GLState()
 	scissorTest.init(false);
 	scissorBox.init(IntRect(0, 0, 640, 480));
 	program.init(0);
+
+	if (conf.maxTextureSize > 0)
+		caps.maxTexSize = conf.maxTextureSize;
 }

src/glstate.h

@@ -27,6 +27,8 @@
 #include <stack>
 #include <assert.h>
 
+struct Config;
+
 template<typename T>
 struct GLProperty
 {
@@ -130,7 +132,7 @@ public:
 
 	} caps;
 
-	GLState();
+	GLState(const Config &conf);
 };
 
 #endif // GLSTATE_H

src/sharedstate.cpp

@@ -109,6 +109,7 @@ struct SharedStatePrivate
 	      graphics(threadData),
 	      input(*threadData),
 	      audio(*threadData),
+	      _glState(threadData->config),
 	      fontState(threadData->config),
 	      stampCounter(0)
 	{