// display callback function
public void display(final GLAutoDrawable drawable) {
final GL gl = drawable.getGL();
// The usual OpenGL stuff to clear the screen and set up viewing.
gl.glClearColor(.25f, .25f, .25f, 1.0f);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(30.0f, 1.0f, .1f, 100);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
glu.gluLookAt(4, 4, -4, 0, 0, 0, 0, 1, 0);
// Make the object rotate a bit each time the display function
// is called
gl.glRotatef(curTime, 0, 1, 0);
// Now make sure that the vertex and fragment programs, loaded
// in LoadCgPrograms() are bound.
CgGL.cgGLBindProgram(vertexProgram);
CgGL.cgGLBindProgram(fragmentProgram);
// Bind uniform parameters to vertex shader
CgGL.cgGLSetStateMatrixParameter(
CgGL.cgGetNamedParameter(vertexProgram, "ModelViewProj"),
CgGL.CG_GL_MODELVIEW_PROJECTION_MATRIX,
CgGL.CG_GL_MATRIX_IDENTITY);
CgGL.cgGLSetStateMatrixParameter(
CgGL.cgGetNamedParameter(vertexProgram, "ModelView"),
CgGL.CG_GL_MODELVIEW_MATRIX,
CgGL.CG_GL_MATRIX_IDENTITY);
CgGL.cgGLSetStateMatrixParameter(
CgGL.cgGetNamedParameter(vertexProgram, "ModelViewIT"),
CgGL.CG_GL_MODELVIEW_MATRIX,
CgGL.CG_GL_MATRIX_INVERSE_TRANSPOSE);
// We can also go ahead and bind varying parameters to vertex shader
// that we just want to have the same value for all vertices. The
// vertex shader could be modified so that these were uniform for
// better efficiency, but this gives us flexibility for the future.
final float Kd[] = {.7f, .2f, .2f}, Ks[] = {.9f, .9f, .9f};
CgGL.cgGLSetParameter3fv(CgGL.cgGetNamedParameter(vertexProgram, "diffuse"), Kd, 0);
CgGL.cgGLSetParameter3fv(CgGL.cgGetNamedParameter(vertexProgram, "specular"), Ks, 0);
// Now bind uniform parameters to fragment shader
final float lightPos[] = {3, 2, -3};
CgGL.cgGLSetParameter3fv(CgGL.cgGetNamedParameter(fragmentProgram, "Plight"), lightPos, 0);
final float lightColor[] = {1, 1, 1};
CgGL.cgGLSetParameter3fv(
CgGL.cgGetNamedParameter(fragmentProgram, "lightColor"), lightColor, 0);
CgGL.cgGLSetParameter1f(CgGL.cgGetNamedParameter(fragmentProgram, "shininess"), 40);
// And finally, enable the approprate texture for fragment shader; the
// texture was originally set up in LoadTextures().
CgGL.cgGLEnableTextureParameter(CgGL.cgGetNamedParameter(fragmentProgram, "diffuseMap"));
// And go ahead and draw the scene geometry
DrawGeometry(gl);
// Disable the texture now that we're done with it.
CgGL.cgGLDisableTextureParameter(CgGL.cgGetNamedParameter(fragmentProgram, "diffuseMap"));
++curTime;
}
