working with LWJGL's implementation of OpenGL, and trying to work with the lighting functions. This requires the creation of FloatBuffers to pass to OpenGL. Relevant code follows:
GL11.glClearColor(0,0,0,0);
float[] ambientLight={(float).3,(float).5,(float).8,1};
FloatBuffer ambientLightB = FloatBuffer.allocate(4);
ambientLightB.put(ambientLight);
float[] diffuseLight={(float).25,(float).25,(float).25,1};
FloatBuffer diffuseLightB = FloatBuffer.allocate(4);
diffuseLightB.put(diffuseLight);
float[] lightPosition={0,0,1,1};
FloatBuffer lightPositionB = FloatBuffer.allocate(4);
lightPositionB.put(lightPosition);
float[] matAmbient={1,1,1,1};
FloatBuffer matAmbientB = FloatBuffer.allocate(4);
matAmbientB.put(matAmbient);
float[] matDiff={1,1,1,1};
FloatBuffer matDiffB = FloatBuffer.allocate(4);
matDiffB.put(matDiff);
GL11.glShadeModel(GL11.GL_SMOOTH);
GL11.glEnable(GL11.GL_DEPTH_TEST);
GL11.glEnable(GL11.GL_CULL_FACE);
GL11.glFrontFace(GL11.GL_CCW);
GL11.glEnable(GL11.GL_LIGHTING);
GL11.glMaterial(GL11.GL_FRONT,GL11.GL_AMBIENT,matAmbientB);
GL11.glMaterial(GL11.GL_FRONT, GL11.GL_DIFFUSE,matDiffB);
GL11.glLight(GL11.GL_LIGHT0,GL11.GL_AMBIENT,ambientLightB);
GL11.glLight(GL11.GL_LIGHT0,GL11.GL_DIFFUSE,diffuseLightB);
GL11.glLight(GL11.GL_LIGHT0,GL11.GL_POSITION,lightPositionB);
GL11.glEnable(GL11.GL_LIGHT0);
The first call I make to glMaterial gives the following error:
Exception in thread "main" java.lang.IllegalArgumentException: Number of remaining buffer elements is 0, must be at least 4. Because at most 4 elements can be returned, a buffer with at least 4 elements is required, regardless of actual returned element count
Not quite sure what I'm doing wrong here, seems to be a problem in the creation of the FloatBuffer.
The solution ended up requiring another function call specific to LWJGL (BufferUtils.createFloatBuffer), as well as the flip() method. The following correctly initialized the buffer
float[] matAmbient={1,1,1,1};
FloatBuffer matAmbientB = BufferUtils.createFloatBuffer(4);
matAmbientB.put(matAmbient);
matAmbientB.flip();