More code restructuring.

Move all love.graphics functionality that doesn’t call OpenGL out of the OpenGL backend Graphics class.

--HG--
branch : minor

src/modules/graphics/Shader.h

@@ -0,0 +1,184 @@
+/**
+ * Copyright (c) 2006-2016 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#pragma once
+
+// LOVE
+#include "common/Object.h"
+#include "common/StringMap.h"
+#include "Texture.h"
+
+// STL
+#include <string>
+#include <map>
+#include <vector>
+
+namespace love
+{
+namespace graphics
+{
+
+// A GLSL shader
+class Shader : public Object
+{
+public:
+
+	static love::Type type;
+
+	enum ShaderStage
+	{
+		STAGE_VERTEX,
+		STAGE_PIXEL,
+		STAGE_MAX_ENUM
+	};
+
+	// Built-in uniform variables.
+	enum BuiltinUniform
+	{
+		BUILTIN_TRANSFORM_MATRIX = 0,
+		BUILTIN_PROJECTION_MATRIX,
+		BUILTIN_TRANSFORM_PROJECTION_MATRIX,
+		BUILTIN_NORMAL_MATRIX,
+		BUILTIN_POINT_SIZE,
+		BUILTIN_SCREEN_SIZE,
+		BUILTIN_VIDEO_Y_CHANNEL,
+		BUILTIN_VIDEO_CB_CHANNEL,
+		BUILTIN_VIDEO_CR_CHANNEL,
+		BUILTIN_MAX_ENUM
+	};
+
+	// Types of potential uniform variables used in love's shaders.
+	enum UniformType
+	{
+		UNIFORM_FLOAT,
+		UNIFORM_MATRIX,
+		UNIFORM_INT,
+		UNIFORM_BOOL,
+		UNIFORM_SAMPLER,
+		UNIFORM_UNKNOWN,
+		UNIFORM_MAX_ENUM
+	};
+
+	struct ShaderSource
+	{
+		std::string vertex;
+		std::string pixel;
+	};
+
+	struct MatrixSize
+	{
+		short columns;
+		short rows;
+	};
+
+	struct UniformInfo
+	{
+		int location;
+		int count;
+
+		union
+		{
+			int components;
+			MatrixSize matrix;
+		};
+
+		UniformType baseType;
+		std::string name;
+
+		union
+		{
+			void *data;
+			float *floats;
+			int *ints;
+		};
+
+		Texture **textures;
+	};
+
+	// Pointer to currently active Shader.
+	static Shader *current;
+
+	// Pointer to the default Shader.
+	static Shader *defaultShader;
+	static Shader *defaultVideoShader;
+
+	virtual ~Shader();
+
+	/**
+	 * Binds this Shader's program to be used when rendering.
+	 *
+	 * @param temporary True if we just want to send values to the shader with
+	 * no intention of rendering.
+	 **/
+	virtual void attach(bool temporary = false) = 0;
+
+	/**
+	 * Attach the default shader.
+	 **/
+	static void attachDefault();
+
+	/**
+	 * Returns any warnings this Shader may have generated.
+	 **/
+	virtual std::string getWarnings() const = 0;
+
+	virtual const UniformInfo *getUniformInfo(const std::string &name) const = 0;
+	virtual void updateUniform(const UniformInfo *info, int count, bool internalUpdate = false) = 0;
+
+	virtual void sendTextures(const UniformInfo *info, Texture **textures, int count, bool internalUpdate = false) = 0;
+
+	/**
+	 * Gets whether a uniform with the specified name exists and is actively
+	 * used in the shader.
+	 **/
+	virtual bool hasUniform(const std::string &name) const = 0;
+
+	static bool getConstant(const char *in, ShaderStage &out);
+	static bool getConstant(ShaderStage in, const char *&out);
+
+	static bool getConstant(const char *in, UniformType &out);
+	static bool getConstant(UniformType in, const char *&out);
+
+	static bool getConstant(const char *in, VertexAttribID &out);
+	static bool getConstant(VertexAttribID in, const char *&out);
+
+	static bool getConstant(const char *in, BuiltinUniform &out);
+	static bool getConstant(BuiltinUniform in, const char *&out);
+
+private:
+
+	static StringMap<ShaderStage, STAGE_MAX_ENUM>::Entry stageNameEntries[];
+	static StringMap<ShaderStage, STAGE_MAX_ENUM> stageNames;
+	
+	static StringMap<UniformType, UNIFORM_MAX_ENUM>::Entry uniformTypeEntries[];
+	static StringMap<UniformType, UNIFORM_MAX_ENUM> uniformTypes;
+	
+	// Names for the generic vertex attributes used by love.
+	static StringMap<VertexAttribID, ATTRIB_MAX_ENUM>::Entry attribNameEntries[];
+	static StringMap<VertexAttribID, ATTRIB_MAX_ENUM> attribNames;
+	
+	// Names for the built-in uniform variables.
+	static StringMap<BuiltinUniform, BUILTIN_MAX_ENUM>::Entry builtinNameEntries[];
+	static StringMap<BuiltinUniform, BUILTIN_MAX_ENUM> builtinNames;
+
+}; // Shader
+
+} // graphics
+} // love