GlTwoInputShader.java

package com.af.experiments.FxCameraApp.shaders;

import com.af.experiments.FxCameraApp.ogles.Texture;
import com.af.experiments.FxCameraApp.renderer.GLES20FramebufferObject;

import static android.opengl.GLES20.*;

public abstract class GlTwoInputShader extends GlShader {

	public static final String UNIFORM_SAMPLER2 = "sTexture2";

	private final Texture mTexture;

	protected GlTwoInputShader(final String vertexShaderSource, final String fragmentShaderSource, final Texture texture) {
		super(vertexShaderSource, fragmentShaderSource);
		mTexture = texture;
	}

	@Override
	public void setup() {
		release();
		super.setup();
		mTexture.setup();
	}

	@Override
	public void release() {
		mTexture.release();
		super.release();
	}

	@Override
	public void draw(final int texName, final GLES20FramebufferObject fbo) {
		useProgram();

		glBindBuffer(GL_ARRAY_BUFFER, getVertexBufferName());
		glEnableVertexAttribArray(getHandle(DEFAULT_ATTRIB_POSITION));
		glVertexAttribPointer(getHandle(DEFAULT_ATTRIB_POSITION), VERTICES_DATA_POS_SIZE, GL_FLOAT, false, VERTICES_DATA_STRIDE_BYTES, VERTICES_DATA_POS_OFFSET);
		glEnableVertexAttribArray(getHandle(DEFAULT_ATTRIB_TEXTURE_COORDINATE));
		glVertexAttribPointer(getHandle(DEFAULT_ATTRIB_TEXTURE_COORDINATE), VERTICES_DATA_UV_SIZE, GL_FLOAT, false, VERTICES_DATA_STRIDE_BYTES, VERTICES_DATA_UV_OFFSET);

		glActiveTexture(GL_TEXTURE0);
		glBindTexture(GL_TEXTURE_2D, texName);
		glUniform1i(getHandle(DEFAULT_UNIFORM_SAMPLER), 0);

		glActiveTexture(GL_TEXTURE1);
		glBindTexture(GL_TEXTURE_2D, mTexture.getTexName());
		glUniform1i(getHandle(UNIFORM_SAMPLER2), 1);

		onDraw();

		glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

		glDisableVertexAttribArray(getHandle(DEFAULT_ATTRIB_POSITION));
		glDisableVertexAttribArray(getHandle(DEFAULT_ATTRIB_TEXTURE_COORDINATE));
		glBindBuffer(GL_ARRAY_BUFFER, 0);
		glBindTexture(GL_TEXTURE_2D, 0);
	}

}