protected void dsSetTexture(DS_TEXTURE_NUMBER texture_number)
{
if (current_state != 2)
throw new Exception("drawing function called outside simulation loop");
tnum = texture_number;
}
void dsDrawFrame(int width, int height, bool pause)
{
if (current_state < 1)
throw new Exception("internal error");
current_state = 2;
// setup stuff
GL.Enable(EnableCap.Lighting);
GL.Enable(EnableCap.Light0);
GL.Disable(EnableCap.Texture2D);
GL.Disable(EnableCap.TextureGenS);
GL.Disable(EnableCap.TextureGenT);
GL.ShadeModel(ShadingModel.Flat);
GL.Enable(EnableCap.DepthTest);
GL.DepthFunc(DepthFunction.Less);
GL.Enable(EnableCap.CullFace);
GL.CullFace(CullFaceMode.Back);
GL.FrontFace(FrontFaceDirection.Ccw);
// setup viewport
GL.Viewport(0, 0, width, height);
GL.MatrixMode(MatrixMode.Projection);
GL.LoadIdentity();
float vnear = 0.1f;
float vfar = 1000.0f;
float k = 0.8f; // view scale, 1 = +/- 45 degrees
if (width >= height)
{
float k2 = (float)height / (float)width;
GL.Frustum(-vnear * k, vnear * k, -vnear * k * k2, vnear * k * k2, vnear, vfar);
}
else
{
float k2 = (float)width / (float)height;
GL.Frustum(-vnear * k * k2, vnear * k * k2, -vnear * k, vnear * k, vnear, vfar);
}
// setup lights. it makes a difference whether this is done in the
// GL_PROJECTION matrix mode (lights are scene relative) or the
// GL_MODELVIEW matrix mode (lights are camera relative, bad!).
// static GLfloat light_ambient[] = { 0.5, 0.5, 0.5, 1.0 };
// static GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
// static GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
GL.Light(LightName.Light0, LightParameter.Ambient, light_ambient);
GL.Light(LightName.Light0, LightParameter.Diffuse, light_diffuse);
GL.Light(LightName.Light0, LightParameter.Specular, light_specular);
GL.Color3(1.0f, 1.0f, 1.0f);
// clear the window
//GL.ClearColor(0.5f, 0.5f, 0.5f, 0);
GL.ClearColor(clearColor.R / 255f, clearColor.G / 255f, clearColor.B / 255f, 0);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
// snapshot camera position (in MS Windows it is changed by the GUI thread)
float[] view2_xyz = (float[])view_xyz.Clone();
float[] view2_hpr = (float[])view_hpr.Clone();
// memcpy (view2_xyz,view_xyz);//,sizeof(float)*3);
// memcpy (view2_hpr,view_hpr);//,sizeof(float)*3);
// go to GL_MODELVIEW matrix mode and set the camera
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity();
setCamera(view2_xyz[0], view2_xyz[1], view2_xyz[2],
view2_hpr[0], view2_hpr[1], view2_hpr[2]);
// set the light position (for some reason we have to do this in model view.
// static GLfloat light_position[] = { LIGHTX, LIGHTY, 1.0, 0.0 };
GL.Light(LightName.Light0, LightParameter.Position, light_position);
// draw the background (ground, sky etc)
drawSky(view2_xyz);
drawGround();
// draw the little markers on the ground
drawPyramidGrid();
// leave openGL in a known state - flat shaded white, no textures
GL.Enable(EnableCap.Lighting);
GL.Disable(EnableCap.Texture2D);
GL.ShadeModel(ShadingModel.Flat);
GL.Enable(EnableCap.DepthTest);
GL.DepthFunc(DepthFunction.Less);
GL.Color3(1.0f, 1.0f, 1.0f);
setColor(1.0f, 1.0f, 1.0f, 1.0f);
// draw the rest of the objects. set drawing state first.
color[0] = 1.0f;
color[1] = 1.0f;
color[2] = 1.0f;
color[3] = 1.0f;
tnum = DS_TEXTURE_NUMBER.DS_NONE;
//if (fn.step)
//fn.step(pause);
}
