Try to fix the gamma issue on some computers

@@ -593,12 +593,16 @@ end
 --- Sets the gamma of the window
 -- By default it uses SDL gamma settings, but it can also use a fullscreen shader if available
 function _M:setGamma(gamma)
-	if self.support_shader_gamma and self.full_fbo_shader then
-		-- Tell the shader which gamma to use
-		self.full_fbo_shader:setUniform("gamma", gamma)
-		-- Remove SDL gamma correction
-		core.display.setGamma(1)
-		print("[GAMMA] Setting gamma correction using fullscreen shader", gamma)
+	if self.support_shader_gamma and core.shader.active() then
+		if self.full_fbo_shader then
+			-- Tell the shader which gamma to use
+			self.full_fbo_shader:setUniform("gamma", gamma)
+			-- Remove SDL gamma correction
+			core.display.setGamma(1)
+			print("[GAMMA] Setting gamma correction using fullscreen shader", gamma)
+		else
+			print("[GAMMA] Not setting gamma correction yet, no fullscreen shader found", gamma)
+		end
 	else
 		core.display.setGamma(gamma)
 		print("[GAMMA] Setting gamma correction using SDL", gamma)

@@ -141,7 +141,7 @@ game = false
 -- Setup resolution
 engine.Game:setResolution(config.settings.window.size, true)
 core.display.setTextBlended(config.settings.aa_text)
-core.display.setGamma(config.settings.gamma_correction / 100)
+-- core.display.setGamma(config.settings.gamma_correction / 100)
 if not config.settings.fbo_active then core.display.disableFBO() print("Disabling FBO") end
 if not config.settings.shaders_active then core.shader.disable() print("Disabling Shaders") end