added the core_vr_simulator to examples (#107)
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Timothy Fong
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examples/core/core_vr_simulator.py
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examples/core/core_vr_simulator.py
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import pyray
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GLSL_VERSION = 330
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# Initialization
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screenWidth = 800
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screenHeight = 450
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# NOTE: screenWidth/screenHeight should match VR device aspect ratio
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pyray.init_window(screenWidth, screenHeight, "raylib [core] example - vr simulator")
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# VR device parameters definition
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device = pyray.VrDeviceInfo(
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# Oculus Rift CV1 parameters for simulator
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2160, # Horizontal resolution in pixels
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1200, # Vertical resolution in pixels
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0.133793, # Horizontal size in meters
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0.0669, # Vertical size in meters
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0.04678, # Screen center in meters
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0.041, # Distance between eye and display in meters
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0.07, # Lens separation distance in meters
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0.07, # IPD (distance between pupils) in meters
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# NOTE: CV1 uses fresnel-hybrid-asymmetric lenses with specific compute shaders
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# Following parameters are just an approximation to CV1 distortion stereo rendering
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[1.0, 0.22, 0.24, 0.0], # Lens distortion constant parameters
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[0.996, -0.004, 1.014, 0.0] # Chromatic aberration correction parameters
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)
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# Load VR stereo config for VR device parameters (Oculus Rift CV1 parameters)
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config = pyray.load_vr_stereo_config(device)
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# Distortion shader (uses device lens distortion and chroma)
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distortion = pyray.load_shader(0, f"resources/distortion{GLSL_VERSION}.fs")
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# Update distortion shader with lens and distortion-scale parameters
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pyray.set_shader_value(distortion, 2,"leftLensCenter", pyray.SHADER_UNIFORM_VEC2)
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pyray.set_shader_value(distortion, 2,"rightLensCenter", pyray.SHADER_UNIFORM_VEC2)
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pyray.set_shader_value(distortion, 2,"leftScreenCenter", pyray.SHADER_UNIFORM_VEC2)
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pyray.set_shader_value(distortion, 2,"rightScreenCenter", pyray.SHADER_UNIFORM_VEC2)
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pyray.set_shader_value(distortion, 2,"scale", pyray.SHADER_UNIFORM_VEC2)
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pyray.set_shader_value(distortion, 2,"scaleIn", pyray.SHADER_UNIFORM_VEC2)
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pyray.set_shader_value(distortion, 4,"deviceWarpParam", pyray.SHADER_UNIFORM_VEC4)
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pyray.set_shader_value(distortion, 4,"chromaAbParam", pyray.SHADER_UNIFORM_VEC4)
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# Initialize framebuffer for stereo rendering
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# NOTE: Screen size should match HMD aspect ratio
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target = pyray.load_render_texture(device.hResolution, device.vResolution)
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# The target's height is flipped (in the source Rectangle), due to OpenGL reasons
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sourceRec = pyray.Rectangle(0.0, 0.0, target.texture.width, -target.texture.height)
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destRec = pyray.Rectangle(0.0, 0.0, pyray.get_screen_width(), pyray.get_screen_height())
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# Define the camera to look into our 3D world
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camera = pyray.Camera3D(
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pyray.Vector3(5.0, 2.0, 5.0), # Camera position
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pyray.Vector3(0.0, 2.0, 0.0), # Camera looking at point
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pyray.Vector3(0.0, 1.0, 0.0), # Camera up vector
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60.0, # Camera field-of-view Y
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pyray.CAMERA_PERSPECTIVE # Camera projection type
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)
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cubePosition = pyray.Vector3(0.0, 0.0, 0.0)
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pyray.disable_cursor() # Limit cursor to relative movement inside the window
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pyray.set_target_fps(90) # Set our game to run at 90 frames-per-second
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# Main game loop
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while not pyray.window_should_close(): # Detect window close button or ESC key
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# Update
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pyray.update_camera(camera, pyray.CAMERA_FIRST_PERSON)
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# Draw
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pyray.begin_texture_mode(target)
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pyray.clear_background(pyray.RAYWHITE)
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pyray.begin_vr_stereo_mode(config)
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pyray.begin_mode_3d(camera)
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pyray.draw_cube(cubePosition, 2.0, 2.0, 2.0, pyray.RED)
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pyray.draw_cube_wires(cubePosition, 2.0, 2.0, 2.0, pyray.MAROON)
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pyray.draw_grid(40, 1.0)
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pyray.end_mode_3d()
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pyray.end_vr_stereo_mode()
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pyray.end_texture_mode()
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pyray.begin_drawing()
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pyray.clear_background(pyray.RAYWHITE)
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pyray.begin_shader_mode(distortion)
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pyray.draw_texture_pro(target.texture, sourceRec, destRec, pyray.Vector2(0.0, 0.0), 0.0, pyray.WHITE)
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pyray.end_shader_mode()
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pyray.draw_fps(10, 10)
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pyray.end_drawing()
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# De-Initialization
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pyray.unload_vr_stereo_config(config) # Unload stereo config
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pyray.unload_render_texture(target) # Unload stereo render fbo
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pyray.unload_shader(distortion) # Unload distortion shader
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pyray.close_window() # Close window and OpenGL context
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