raze/source/glbackend/gl_uniform.h

#pragma once

class FBufferedUniform1f
{
	float mBuffer;
	int mIndex;

public:
	void Init(GLuint hShader, const GLchar *name)
	{
		mIndex = glGetUniformLocation(hShader, name);
		mBuffer = 0;
	}

	void Set(float newvalue)
	{
		if (newvalue != mBuffer)
		{
			mBuffer = newvalue;
			glUniform1f(mIndex, newvalue);
		}
	}
};

class FBufferedUniform2f
{
	float mBuffer[2];
	int mIndex;

public:
	void Init(GLuint hShader, const GLchar *name)
	{
		mIndex = glGetUniformLocation(hShader, name);
		memset(mBuffer, 0, sizeof(mBuffer));
	}

	void Set(const float *newvalue)
	{
		if (memcmp(newvalue, mBuffer, sizeof(mBuffer)))
		{
			memcpy(mBuffer, newvalue, sizeof(mBuffer));
			glUniform2fv(mIndex, 1, newvalue);
		}
	}

	void Set(float f1, float f2)
	{
		if (mBuffer[0] != f1 || mBuffer[1] != f2)
		{
			mBuffer[0] = f1;
			mBuffer[1] = f2;
			glUniform2fv(mIndex, 1, mBuffer);
		}
	}

};

class FBufferedUniform4f
{
	float mBuffer[4];
	int mIndex;

public:
	void Init(GLuint hShader, const GLchar *name)
	{
		mIndex = glGetUniformLocation(hShader, name);
		memset(mBuffer, 0, sizeof(mBuffer));
	}

	void Set(const float *newvalue)
	{
		if (memcmp(newvalue, mBuffer, sizeof(mBuffer)))
		{
			memcpy(mBuffer, newvalue, sizeof(mBuffer));
			glUniform4fv(mIndex, 1, newvalue);
		}
	}
}; 

class FUniformMatrix4f
{
	int mIndex;

public:
	void Init(GLuint hShader, const GLchar *name)
	{
		mIndex = glGetUniformLocation(hShader, name);
	}

	void Set(const float *newvalue)
	{
		glUniformMatrix4fv(mIndex, 1, false, newvalue);
	}
};