/*
This file is part of jpcsp.

Jpcsp is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Jpcsp is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Jpcsp.  If not, see <http://www.gnu.org/licenses/>.
 */
package jpcsp.Allegrex.compiler.nativeCode;

import jpcsp.memory.IMemoryReader;
import jpcsp.memory.IMemoryWriter;
import jpcsp.memory.MemoryReader;
import jpcsp.memory.MemoryWriter;

/**
 * @author gid15
 *
 */
public class MatrixOperation extends AbstractNativeCodeSequence {
	static public void multMat4x4ByVec4(int matReg, int matOffset, int vecReg, int vecOffset, int resultReg, int resultOffset) {
		int mat = getRegisterValue(matReg) + matOffset;
		int vec = getRegisterValue(vecReg) + vecOffset;
		int result = getRegisterValue(resultReg) + resultOffset;

		IMemoryReader matReader = MemoryReader.getMemoryReader(mat, 64, 4);
		IMemoryReader vecReader = MemoryReader.getMemoryReader(vec, 16, 4);
		IMemoryWriter resultWriter = MemoryWriter.getMemoryWriter(result, 16, 4);

		float vec0 = Float.intBitsToFloat(vecReader.readNext());
		float vec1 = Float.intBitsToFloat(vecReader.readNext());
		float vec2 = Float.intBitsToFloat(vecReader.readNext());
		float vec3 = Float.intBitsToFloat(vecReader.readNext());

		for (int i = 0; i < 4; i++) {
			float mat0 = Float.intBitsToFloat(matReader.readNext());
			float mat1 = Float.intBitsToFloat(matReader.readNext());
			float mat2 = Float.intBitsToFloat(matReader.readNext());
			float mat3 = Float.intBitsToFloat(matReader.readNext());

			float res = vec0 * mat0 + vec1 * mat1 + vec2 * mat2 + vec3 * mat3;
			resultWriter.writeNext(Float.floatToRawIntBits(res));
		}
		resultWriter.flush();
	}
}