support custom colors and put transform in function.

js/pixl/public/trixl.html

	</script>
	<script type="gl/fragment-shader">
		precision mediump float;
		uniform vec4 color;
		varying vec3 world_pos;
		void main() {
			gl_FragColor = vec4(world_pos.x, world_pos.y, world_pos.z, 1);
			if (color.x >= 0.0 && color.x <= 1.0) {
				gl_FragColor = color;
			} else {
				gl_FragColor = vec4(world_pos.x, world_pos.y, world_pos.z, 1);
			}
		}
	</script>
	<script>
				return s;
			}
			trixl.debug.innerHTML = coord_html(pos[0]) + ", " + coord_html(pos[1]) + ", " + coord_html(pos[2]);
			return coord_html(pos[0]) + ", " + coord_html(pos[1]) + ", " + coord_html(pos[2]);
		}
		var gl = trixl.gl = trixl.stage.getContext("webgl");
		//gl.enable(gl.CULL_FACE);
		gl.enableVertexAttribArray(program.vertexPosAttrib);
		gl.vertexAttribPointer(program.vertexPosBuffer, 3, gl.FLOAT, false, 0, 0);
		program.color = gl.getUniformLocation(program, 'color');
		gl.uniform4f(program.color, -1, -1, -1, -1);
		var angle = {x: 0, y: 0, z: 0};
		var offset = {x: 0, y: 0, z: 0};
		program.transform = gl.getUniformLocation(program, 'transform');
		trixl.redraw = function() {
			var transform = matrix.multiplyMany4x4(
				//matrix.identity(4), matrix.identity(4) /*
				matrix.translate(-0.5, -0.5, -0.0),
				matrix.scale(0.5, 0.5, 0.5),
				matrix.rotateZ(angle.z / 4),
				//matrix.rotateY(angle.y / 10),
				matrix.rotateX(angle.x / 4),
				//matrix.translate(-0.5, -0.5, 0),
				//matrix.translate(-0.5, -0.5, -0.5),
				matrix.translate(-0.0, -0.0, -0.1)
				//matrix.perspective(Math.PI / 3, trixl.window.w / trixl.window.h, 0, 2000) //*/
			);
			trixl.debug_pos(matrix.multiply([1,1,1,1], [1, 4], transform, [4, 4]));
			gl.uniformMatrix4fv(program.transform, false, transform);
			var aspect = trixl.window.w / trixl.window.h;
			var transform = function(pos) {
				return matrix.multiplyMany4x4(
					//matrix.scale(0.6, 0.6, 0.6),
					matrix.translate(-0.5, -0.5, -0.5),
					matrix.rotateZ(angle.z / 10),
					//matrix.rotateY(angle.y / 10),
					matrix.rotateX(angle.x / 10),
					matrix.translate(pos[0] + offset.x, pos[1] + offset.y, pos[2] + offset.z),
					[1, 0, 0, 0,
					 0, 1, 0, 0,
					 0, 0, 1, 1,
					 0, 0, 0, 1],
					[Math.PI / 3 / aspect, 0, 0, 0,
					 0, Math.PI / 3, 0, 0,
					 0, 0, 1, 0,
					 0, 0, 0, 1]
				);
			}
			var t = transform([0.0, 0.0, 2]);
			trixl.debug.innerHTML = "";
			[[0, 0, 0], [0, 1, 0], [1, 0, 0], [1, 1, 0],
			 [0, 0, 1], [0, 1, 1], [1, 0, 1], [1, 1, 1]].forEach(function(el) {
				trixl.debug.innerHTML +=
				trixl.debug_pos(matrix.multiply([el[0], el[1], el[2], 1], [1, 4], t, [4, 4]));
				trixl.debug.innerHTML += "<br />";
			 });
			gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
			gl.uniform4f(program.color, (Math.sin(angle.x) + 1.0) * 0.5, 0, 0, 1.0);
			gl.uniformMatrix4fv(program.transform, false, t);
			gl.drawArrays(gl.TRIANGLES, 0, 6 * 6);
			angle.x += Math.PI / 10;