shaders.ShadowShader Maven / Gradle / Ivy

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2D real-time lighting using box2d

There is a newer version: 1.5

package shaders;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;

public final class ShadowShader {
	static final public ShaderProgram createShadowShader() {
		final String vertexShader = "attribute vec4 a_position;\n" //
				+ "attribute vec2 a_texCoord;\n" //
				+ "varying vec2 v_texCoords;\n" //
				+ "\n" //
				+ "void main()\n" //
				+ "{\n" //
				+ "   v_texCoords = a_texCoord;\n" //
				+ "   gl_Position = a_position;\n" //
				+ "}\n";
		final String fragmentShader = "#ifdef GL_ES\n" //
			+ "precision lowp float;\n" //
			+ "#define MED mediump\n"
			+ "#else\n"
			+ "#define MED \n"
			+ "#endif\n" //
				+ "varying MED vec2 v_texCoords;\n" //
				+ "uniform sampler2D u_texture;\n" //
				+ "uniform vec4 ambient;\n"				
				+ "void main()\n"//
				+ "{\n" //
				+ "vec4 c = texture2D(u_texture, v_texCoords);\n"//
				+ "gl_FragColor.rgb = c.rgb * c.a + ambient.rgb;\n"//
				+ "gl_FragColor.a = ambient.a - c.a;\n"//				
				+ "}\n";
		ShaderProgram.pedantic = false;
		ShaderProgram shadowShader = new ShaderProgram(vertexShader,
				fragmentShader);
		if (shadowShader.isCompiled() == false) {
			Gdx.app.log("ERROR", shadowShader.getLog());

		}

		return shadowShader;
	}
}