Java Code Examples for com.jogamp.opengl.GL2GL3#glGetAttribLocation()

public static void init(Renderer r, GL2GL3 gl) {
	int[] is = new int[1];
	gl.glGenBuffers(1, is, 0);
	_vertBuffer = is[0];

	Shader s = r.getShader(ShaderHandle.DEBUG);
	_progHandle = s.getProgramHandle();
	gl.glUseProgram(_progHandle);

	_modelViewMatVar = gl.glGetUniformLocation(_progHandle, "modelViewMat");
	_projMatVar = gl.glGetUniformLocation(_progHandle, "projMat");
	_colorVar = gl.glGetUniformLocation(_progHandle, "color");

	_cVar = gl.glGetUniformLocation(_progHandle, "C");
	_fcVar = gl.glGetUniformLocation(_progHandle, "FC");

	_posVar = gl.glGetAttribLocation(_progHandle, "position");

	_hasInitialized = true;
}
 

private void updateTexCoordBuffer(Renderer renderer) {
	GL2GL3 gl = renderer.getGL();
	int texCoordBuffSize = _texCoords.size()*2*4;
	_texCoordHandle = renderer.getTexMemManager().allocateBuffer(texCoordBuffSize, gl);
	int buffID = _texCoordHandle.bind();

	FloatBuffer texData = FloatBuffer.allocate(_texCoords.size()*2);

	for (Vec2d v : _texCoords) {
		texData.put((float)v.x); texData.put((float)v.y);
	}
	texData.flip();
	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, buffID);
	gl.glBufferData(GL2GL3.GL_ARRAY_BUFFER, texCoordBuffSize, texData, GL2GL3.GL_STATIC_DRAW);

	int texCoordVar = gl.glGetAttribLocation(progHandle, "texCoord");
	gl.glEnableVertexAttribArray(texCoordVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, buffID);
	gl.glVertexAttribPointer(texCoordVar, 2, GL2GL3.GL_FLOAT, false, 0, 0);

}
 

private static void initStaticData(Renderer r) {
	GL2GL3 gl = r.getGL();

	// Initialize the shader variables
	progHandle = r.getShader(Renderer.ShaderHandle.OVERLAY_FLAT).getProgramHandle();

	int[] is = new int[1];
	gl.glGenBuffers(1, is, 0);
	glBuff = is[0];

	hasTexVar = gl.glGetUniformLocation(progHandle, "useTex");
	sizeVar = gl.glGetUniformLocation(progHandle, "size");
	offsetVar = gl.glGetUniformLocation(progHandle, "offset");
	colorVar = gl.glGetUniformLocation(progHandle, "color");

	posVar = gl.glGetAttribLocation(progHandle, "position");
	staticInit = true;
}
 

private static void initStaticData(Renderer r) {
	GL2GL3 gl = r.getGL();

	// Initialize the shader variables
	progHandle = r.getShader(Renderer.ShaderHandle.OVERLAY_FLAT).getProgramHandle();

	int[] is = new int[1];
	gl.glGenBuffers(1, is, 0);
	lineGLBuff = is[0];

	hasTexVar = gl.glGetUniformLocation(progHandle, "useTex");
	sizeVar = gl.glGetUniformLocation(progHandle, "size");
	offsetVar = gl.glGetUniformLocation(progHandle, "offset");
	colorVar = gl.glGetUniformLocation(progHandle, "color");

	posVar = gl.glGetAttribLocation(progHandle, "position");
	staticInit = true;
}
 

private void setupVAO(int contextID, Renderer renderer) {
	GL2GL3 gl = renderer.getGL();

	int vao = renderer.generateVAO(contextID, gl);
	VAOMap.put(contextID, vao);

	gl.glBindVertexArray(vao);


	// Position
	int posVar = gl.glGetAttribLocation(progHandle, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, vertBuff);
	gl.glVertexAttribPointer(posVar, 3, GL2GL3.GL_FLOAT, false, 0, 0);

	// Normals
	int normalVar = gl.glGetAttribLocation(progHandle, "normal");
	gl.glEnableVertexAttribArray(normalVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, normalBuff);
	gl.glVertexAttribPointer(normalVar, 3, GL2GL3.GL_FLOAT, false, 0, 0);

	// TexCoords
	if (_texCoords == null) {
		// Use default buffer if custom coords have not been included
		int texCoordVar = gl.glGetAttribLocation(progHandle, "texCoord");
		gl.glEnableVertexAttribArray(texCoordVar);

		gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, texCoordBuff);
		gl.glVertexAttribPointer(texCoordVar, 2, GL2GL3.GL_FLOAT, false, 0, 0);

		gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, 0);
	}
	gl.glBindVertexArray(0);

}
 

private static void initBSInfo(Renderer r, GL2GL3 gl) {
	BatchShaderInfo si = bsInfo;

	si.progHandle = r.getShader(ShaderHandle.MESH_BATCH).getProgramHandle();
	int ph = bsInfo.progHandle;

	gl.glUseProgram(ph);

	si.instSpaceMatVar = gl.glGetAttribLocation(ph, "instSpaceMat");
	si.instSpaceNorMatVar = gl.glGetAttribLocation(ph, "instSpaceNorMat");

	// Bind the shader variables
	si.modelViewMatVar = gl.glGetUniformLocation(ph, "modelViewMat");
	si.projMatVar = gl.glGetUniformLocation(ph, "projMat");
	si.normalMatVar = gl.glGetUniformLocation(ph, "normalMat");

	si.posVar = gl.glGetAttribLocation(ph, "position");
	si.norVar = gl.glGetAttribLocation(ph, "normal");
	si.texCoordVar = gl.glGetAttribLocation(ph, "texCoord");

	si.diffTexVar = gl.glGetUniformLocation(ph, "diffTexs");

	si.diffuseColorVar = gl.glGetAttribLocation(ph, "diffuseColorV");
	si.diffTexIndexVar = gl.glGetAttribLocation(ph, "diffTexIndexV");
	si.ambientColorVar = gl.glGetAttribLocation(ph, "ambientColorV");
	si.specColorVar = gl.glGetAttribLocation(ph, "specColorV");
	si.shininessVar = gl.glGetAttribLocation(ph, "shininessV");

	si.lightDirVar = gl.glGetUniformLocation(ph, "lightDir");
	si.lightIntVar = gl.glGetUniformLocation(ph, "lightIntensity");
	si.numLightsVar = gl.glGetUniformLocation(ph, "numLights");

	si.cVar = gl.glGetUniformLocation(ph, "C");
	si.fcVar = gl.glGetUniformLocation(ph, "FC");

}
 

private void setupVAO(int contextID, Renderer renderer) {
	GL2GL3 gl = renderer.getGL();

	int vao = renderer.generateVAO(contextID, gl);
	VAOMap.put(contextID, vao);

	gl.glBindVertexArray(vao);


	// Position
	int posVar = gl.glGetAttribLocation(progHandle, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, vertBuff);
	gl.glVertexAttribPointer(posVar, 3, GL2GL3.GL_FLOAT, false, 0, 0);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, 0);

	gl.glBindVertexArray(0);

}
 

private void setupVAO(int contextID, Renderer renderer) {
	GL2GL3 gl = renderer.getGL();

	int vao = renderer.generateVAO(contextID, gl);
	VAOMap.put(contextID, vao);

	gl.glBindVertexArray(vao);


	// Position
	int posVar = gl.glGetAttribLocation(progHandle, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, vertBuff);
	gl.glVertexAttribPointer(posVar, 3, GL2GL3.GL_FLOAT, false, 0, 0);

	// TexCoords
	int texCoordVar = gl.glGetAttribLocation(progHandle, "texCoordVert");
	gl.glEnableVertexAttribArray(texCoordVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, texCoordBuff);
	gl.glVertexAttribPointer(texCoordVar, 2, GL2GL3.GL_FLOAT, false, 0, 0);

	gl.glBindVertexArray(0);
}
 

private void setupVAO(int contextID, Renderer renderer, int progHandle, int vertexBuffer, int indexBuffer) {
	GL2GL3 gl = renderer.getGL();

	int vao = renderer.generateVAO(contextID, gl);

	_vaoMap.put(contextID, vao);
	gl.glBindVertexArray(vao);

	gl.glUseProgram(progHandle);

	int posVar = gl.glGetAttribLocation(progHandle, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, vertexBuffer);
	gl.glVertexAttribPointer(posVar, 3, GL2GL3.GL_FLOAT, false, 0, 0);

	gl.glBindBuffer(GL2GL3.GL_ELEMENT_ARRAY_BUFFER, indexBuffer);

	gl.glBindVertexArray(0);

}
 

private void setupVAOForSubMeshImp(int contextID, int shaderID, SubMesh sub, Renderer renderer) {
	GL2GL3 gl = renderer.getGL();

	int vao = renderer.generateVAO(contextID, gl);
	sub.vaoMaps[shaderID].put(contextID, vao);
	gl.glBindVertexArray(vao);

	int progHandle = sInfos[shaderID].meshProgHandle;
	gl.glUseProgram(progHandle);

	int texCoordVar = gl.glGetAttribLocation(progHandle, "texCoord");

	// For some shaders the texCoordVar may be optimized away
	if (texCoordVar != -1) {
		if (sub._texCoordBuffer != 0) {
			// Texture coordinates
			gl.glEnableVertexAttribArray(texCoordVar);

			gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, sub._texCoordBuffer);
			gl.glVertexAttribPointer(texCoordVar, 2, GL2GL3.GL_FLOAT, false, 0, 0);
		} else {
			gl.glVertexAttrib2f(texCoordVar, 0, 0);
		}
	}

	int posVar = gl.glGetAttribLocation(progHandle, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, sub._vertexBuffer);
	gl.glVertexAttribPointer(posVar, 3, GL2GL3.GL_FLOAT, false, 0, 0);

	// Normals
	int normalVar = gl.glGetAttribLocation(progHandle, "normal");
	gl.glEnableVertexAttribArray(normalVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, sub._normalBuffer);
	gl.glVertexAttribPointer(normalVar, 3, GL2GL3.GL_FLOAT, false, 0, 0);

	if (!flattenBuffers) {
		gl.glBindBuffer(GL2GL3.GL_ELEMENT_ARRAY_BUFFER, sub._indexBuffer);
	}

	gl.glBindVertexArray(0);

}
 

private void setupVAOForSubLine(int contextID, SubLine sub, Renderer renderer) {
	GL2GL3 gl = renderer.getGL();

	int vao = renderer.generateVAO(contextID, gl);
	sub.vaoMap.put(contextID, vao);
	gl.glBindVertexArray(vao);

	int prog = sub._progHandle;
	gl.glUseProgram(prog);

	int posVar = gl.glGetAttribLocation(prog, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, sub._vertexBuffer);
	gl.glVertexAttribPointer(posVar, 3, GL2GL3.GL_FLOAT, false, 0, 0);

	gl.glBindVertexArray(0);

}
 

private void setupVAOForStaticLines(int contextID, Renderer renderer) {
	GL2GL3 gl = renderer.getGL();

	int vao = renderer.generateVAO(contextID, gl);
	_lineVAOs.put(contextID, vao);
	gl.glBindVertexArray(vao);

	Shader s= renderer.getShader(ShaderHandle.DEBUG_BATCH);
	assert(s.isGood());
	int prog = s.getProgramHandle();
	gl.glUseProgram(prog);

	int posVar = gl.glGetAttribLocation(prog, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, linePosBuffer);
	gl.glVertexAttribPointer(posVar, 3, GL2GL3.GL_FLOAT, false, 0, 0);

	int colVar = gl.glGetAttribLocation(prog, "vertColor");
	gl.glEnableVertexAttribArray(colVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, lineInstColorBuffer);
	gl.glVertexAttribPointer(colVar, 4, GL2GL3. GL_UNSIGNED_BYTE, true, 0, 0);
	gl.glVertexAttribDivisor(colVar, 1);

	int instMatVar = gl.glGetAttribLocation(prog, "instMat");
	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, lineTransBuffer);

	for (int i = 0; i < 4; ++i) {
		// Enable 4 variables because this is a matrix
		int varInd = instMatVar + i;

		gl.glEnableVertexAttribArray(varInd);

		gl.glVertexAttribPointer(varInd, 4, GL2GL3.GL_FLOAT, false, 16*4, i*4*4);
		gl.glVertexAttribDivisor(varInd, 1); // Per instance
	}

	gl.glBindVertexArray(0);

}
 

/**
 * Initialize the GL assets needed, this should be called with the shared GL context
 * @param gl
 */
public static void init(Renderer r, GL2GL3 gl) {
	int[] is = new int[3];
	gl.glGenBuffers(3, is, 0);
	_aabbVertBuffer = is[0];
	_boxVertBuffer = is[1];
	_lineVertBuffer = is[2];

	Shader s = r.getShader(ShaderHandle.DEBUG);
	_debugProgHandle = s.getProgramHandle();
	gl.glUseProgram(_debugProgHandle);

	_modelViewMatVar = gl.glGetUniformLocation(_debugProgHandle, "modelViewMat");
	_projMatVar = gl.glGetUniformLocation(_debugProgHandle, "projMat");
	_colorVar = gl.glGetUniformLocation(_debugProgHandle, "color");

	_posVar = gl.glGetAttribLocation(_debugProgHandle, "position");

	_cVar = gl.glGetAttribLocation(_debugProgHandle, "C");
	_fcVar = gl.glGetAttribLocation(_debugProgHandle, "FC");

	// Build up a buffer of vertices for lines in a box
	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, _aabbVertBuffer);

	FloatBuffer fb = FloatBuffer.allocate(3 * 2 * 12); // 12 line segments
	// Top lines
	app( 1,  1,  1, fb);
	app( 1, -1,  1, fb);

	app( 1, -1,  1, fb);
	app(-1, -1,  1, fb);

	app(-1, -1,  1, fb);
	app(-1,  1,  1, fb);

	app(-1,  1,  1, fb);
	app( 1,  1,  1, fb);

	// Bottom lines
	app( 1,  1, -1, fb);
	app( 1, -1, -1, fb);

	app( 1, -1, -1, fb);
	app(-1, -1, -1, fb);

	app(-1, -1, -1, fb);
	app(-1,  1, -1, fb);

	app(-1,  1, -1, fb);
	app( 1,  1, -1, fb);

	// Side lines
	app( 1,  1,  1, fb);
	app( 1,  1, -1, fb);

	app(-1,  1,  1, fb);
	app(-1,  1, -1, fb);

	app( 1, -1,  1, fb);
	app( 1, -1, -1, fb);

	app(-1, -1,  1, fb);
	app(-1, -1, -1, fb);

	fb.flip();

	gl.glBufferData(GL2GL3.GL_ARRAY_BUFFER, 3 * 2 * 12 * 4, fb, GL2GL3.GL_STATIC_DRAW);
	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, 0);

	// Create a buffer for drawing rectangles
	// Build up a buffer of vertices for lines in a box
	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, _boxVertBuffer);

	fb = FloatBuffer.allocate(3 * 2 * 4); // 4 line segments

	// lines
	app( 0.5f,  0.5f,  0, fb);
	app( 0.5f, -0.5f,  0, fb);

	app( 0.5f, -0.5f,  0, fb);
	app(-0.5f, -0.5f,  0, fb);

	app(-0.5f, -0.5f,  0, fb);
	app(-0.5f,  0.5f,  0, fb);

	app(-0.5f,  0.5f,  0, fb);
	app( 0.5f,  0.5f,  0, fb);

	fb.flip();

	gl.glBufferData(GL2GL3.GL_ARRAY_BUFFER, 3 * 2 * 4 * 4, fb, GL2GL3.GL_STATIC_DRAW);
	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, 0);

}
 

/**
 * Note: render() and renderForView() are mutually non-reentrant due to shared temporaries. This should be fine
 * because neither should ever be called by any thread other than the render thread.
 */
@Override
public void render(int contextID, Renderer renderer, double windowWidth,
		double windowHeight, Camera cam, Ray pickRay) {

	GL2GL3 gl = renderer.getGL();

	if (!VAOMap.containsKey(contextID)) {
		setupVAO(contextID, renderer);
	}

	int vao = VAOMap.get(contextID);
	gl.glBindVertexArray(vao);

	// Render the string
	Shader s = renderer.getShader(Renderer.ShaderHandle.OVERLAY_FONT);

	s.useShader(gl);
	int prog = s.getProgramHandle();

	// Work out the billboard position
	cam.getViewMat4d(tempViewMat);
	// Build up the projection*view matrix
	tempViewMat.mult4(cam.getProjMat4d(), tempViewMat);

	tempPos.x = _pos.x;
	tempPos.y = _pos.y;
	tempPos.z = _pos.z;
	tempPos.w = 1.0;

	tempPos.mult4(tempViewMat, tempPos);
	tempPos.x /= tempPos.w;
	tempPos.y /= tempPos.w;
	// TempPos x and y are now in normalized coordinate space (after the projection)

	int colorVar = gl.glGetUniformLocation(prog, "color");
	gl.glUniform4fv(colorVar, 1, _color, 0);

	int posVar = gl.glGetAttribLocation(prog, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, _font.getGLBuffer(gl));
	gl.glVertexAttribPointer(posVar, 2, GL2GL3.GL_FLOAT, false, 0, 0);
	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, 0);

	int offsetVar = gl.glGetUniformLocation(prog, "offset");

	float scaleY = (float)(2 * _height / (windowHeight * _font.getNominalHeight()));
	float scaleX = scaleY * (float)(windowHeight/windowWidth);

	int scaleVar = gl.glGetUniformLocation(prog, "scale");
	gl.glUniform2f(scaleVar, scaleX, scaleY);

	float offsetX = (float)tempPos.x;
	float offsetY = (float)tempPos.y;

	offsetX += _xOffset*2.0/windowWidth;
	offsetY += _yOffset*2.0/windowHeight;

	gl.glDisable(GL2GL3.GL_CULL_FACE);

	for (int cp : RenderUtils.stringToCodePoints(_contents)) {
		TessChar tc = _font.getTessChar(cp);
		if (tc == null) {
			assert(false);
			continue;
		}

		gl.glUniform2f(offsetVar, offsetX, offsetY);

		gl.glDrawArrays(GL2GL3.GL_TRIANGLES, tc.getStartIndex(), tc.getNumVerts());

		offsetX += tc.getAdvance()*scaleX;
	}

	gl.glEnable(GL2GL3.GL_CULL_FACE);

}
 

@Override
public void render(int contextID, Renderer renderer, Camera cam, Ray pickRay) {
	GL2GL3 gl = renderer.getGL();

	if (!VAOMap.containsKey(contextID)) {
		setupVAO(contextID, renderer);
	}

	int vao = VAOMap.get(contextID);
	gl.glBindVertexArray(vao);

	// Render the string
	Shader s = renderer.getShader(Renderer.ShaderHandle.FONT);

	s.useShader(gl);
	int prog = s.getProgramHandle();

	// Setup uniforms for this object
	Mat4d modelViewProjMat = new Mat4d();
	cam.getViewMat4d(modelViewProjMat);
	modelViewProjMat.mult4(_trans);

	Mat4d projMat = cam.getProjMat4d();
	modelViewProjMat.mult4(projMat, modelViewProjMat);

	int modelViewProjMatVar = gl.glGetUniformLocation(prog, "modelViewProjMat");
	gl.glUniformMatrix4fv(modelViewProjMatVar, 1, false, RenderUtils.MarshalMat4d(modelViewProjMat), 0);

	int colorVar = gl.glGetUniformLocation(prog, "color");
	gl.glUniform4fv(colorVar, 1, _color, 0);

	int cVar = gl.glGetUniformLocation(prog, "C");
	gl.glUniform1f(cVar, Camera.C);

	int fcVar = gl.glGetUniformLocation(prog, "FC");
	gl.glUniform1f(fcVar, Camera.FC);

	int advanceVar = gl.glGetUniformLocation(prog, "advance");

	int posVar = gl.glGetAttribLocation(prog, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, _font.getGLBuffer(gl));
	gl.glVertexAttribPointer(posVar, 2, GL2GL3.GL_FLOAT, false, 0, 0);
	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, 0);


	// Send out one draw call per character
	float advance = 0;

	gl.glDisable(GL2GL3.GL_CULL_FACE);

	for (int i = 0; i < _contents.length; ++i) {

		gl.glUniform1f(advanceVar, advance);

		gl.glDrawArrays(GL2GL3.GL_TRIANGLES, starts[i], numVerts[i]);

		advance += advances[i];
	}
	gl.glEnable(GL2GL3.GL_CULL_FACE);

	// Cleanup
	gl.glDisableVertexAttribArray(posVar);
}
 

@Override
public void render(int contextID, Renderer renderer,
	double windowWidth, double windowHeight, Camera cam, Ray pickRay) {


	Vec3d renderedSize = _font.getStringSize(_height, _contents);
	double x = _x;
	double y = _y;
	if (_alignRight) {
		x = windowWidth - _x - renderedSize.x;
	}
	if (!_alignBottom) {
		y = windowHeight - _y - renderedSize.y;
	}


	GL2GL3 gl = renderer.getGL();

	if (!VAOMap.containsKey(contextID)) {
		setupVAO(contextID, renderer);
	}

	int vao = VAOMap.get(contextID);
	gl.glBindVertexArray(vao);

	// Render the string
	Shader s = renderer.getShader(Renderer.ShaderHandle.OVERLAY_FONT);

	s.useShader(gl);
	int prog = s.getProgramHandle();

	int colorVar = gl.glGetUniformLocation(prog, "color");
	gl.glUniform4fv(colorVar, 1, _color, 0);

	int posVar = gl.glGetAttribLocation(prog, "position");
	gl.glEnableVertexAttribArray(posVar);

	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, _font.getGLBuffer(gl));
	gl.glVertexAttribPointer(posVar, 2, GL2GL3.GL_FLOAT, false, 0, 0);
	gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, 0);

	int offsetVar = gl.glGetUniformLocation(prog, "offset");

	float scaleY = (float)(2 * _height / (windowHeight * _font.getNominalHeight()));
	float scaleX = scaleY * (float)(windowHeight/windowWidth);

	int scaleVar = gl.glGetUniformLocation(prog, "scale");
	gl.glUniform2f(scaleVar, scaleX, scaleY);

	float offsetX = (float)(2*x/windowWidth - 1);
	float offsetY = (float)(2*y/windowHeight - 1);

	gl.glDisable(GL2GL3.GL_CULL_FACE);

	for (int cp : RenderUtils.stringToCodePoints(_contents)) {
		TessChar tc = _font.getTessChar(cp);
		if (tc == null) {
			assert(false);
			continue;
		}

		gl.glUniform2f(offsetVar, offsetX, offsetY);

		gl.glDrawArrays(GL2GL3.GL_TRIANGLES, tc.getStartIndex(), tc.getNumVerts());

		offsetX += tc.getAdvance()*scaleX;
	}

	gl.glEnable(GL2GL3.GL_CULL_FACE);
}