pyvr/scene_vr_basic.py at main · astrofra/pyvr · GitHub

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# Display a scene in VR

import harfang as hg
import sys

# Create materials
def create_material(prg_ref, ubc, orm):
	mat = hg.Material()
	hg.SetMaterialProgram(mat, prg_ref)
	hg.SetMaterialValue(mat, "uBaseOpacityColor", ubc)
	hg.SetMaterialValue(mat, "uOcclusionRoughnessMetalnessColor", orm)
	return mat


def main():
	hg.InputInit()
	hg.WindowSystemInit()

	res_x, res_y = 1280, 720
	win = hg.RenderInit("Harfang - OpenVR Scene", res_x, res_y, hg.RF_VSync | hg.RF_MSAA4X)

	hg.AddAssetsFolder("assets_compiled")

	pipeline = hg.CreateForwardPipeline()
	res = hg.PipelineResources()

	render_data = hg.SceneForwardPipelineRenderData()  # this object is used by the low-level scene rendering API to share view-independent data with both eyes

	# OpenVR initialization
	if not hg.OpenVRInit():
		sys.exit()

	vr_left_fb = hg.OpenVRCreateEyeFrameBuffer(hg.OVRAA_MSAA4x)
	vr_right_fb = hg.OpenVRCreateEyeFrameBuffer(hg.OVRAA_MSAA4x)

	# Create models
	vtx_layout = hg.VertexLayoutPosFloatNormUInt8()

	cube_mdl = hg.CreateCubeModel(vtx_layout, 1, 1, 1)
	cube_ref = res.AddModel('cube', cube_mdl)
	ground_mdl = hg.CreateCubeModel(vtx_layout, 50, 0.01, 50)
	ground_ref = res.AddModel('ground', ground_mdl)

	# Load shader
	prg_ref = hg.LoadPipelineProgramRefFromAssets('core/shader/pbr.hps', res, hg.GetForwardPipelineInfo())


	# Create scene
	scene = hg.Scene()
	scene.canvas.color = hg.Color(255 / 255, 255 / 255, 217 / 255, 1)
	scene.environment.ambient = hg.Color(15 / 255, 12 / 255, 9 / 255, 1)

	lgt = hg.CreateSpotLight(scene, hg.TransformationMat4(hg.Vec3(-8, 4, -5), hg.Vec3(hg.Deg(19), hg.Deg(59), 0)), 0, hg.Deg(5), hg.Deg(30), hg.Color.White, hg.Color.White, 10, hg.LST_Map, 0.0001)
	back_lgt = hg.CreatePointLight(scene, hg.TranslationMat4(hg.Vec3(2.4, 1, 0.5)), 10, hg.Color(94 / 255, 255 / 255, 228 / 255, 1), hg.Color(94 / 255, 1, 228 / 255, 1), 0)

	mat_cube = create_material(prg_ref, hg.Vec4(255 / 255, 230 / 255, 20 / 255, 1), hg.Vec4(1, 0.658, 0., 1))
	hg.CreateObject(scene, hg.TransformationMat4(hg.Vec3(0, 0.5, 0), hg.Vec3(0, hg.Deg(70), 0)), cube_ref, [mat_cube])

	mat_ground = create_material(prg_ref, hg.Vec4(255 / 255, 120 / 255, 147 / 255, 1), hg.Vec4(1, 1, 0.1, 1))
	hg.CreateObject(scene, hg.TranslationMat4(hg.Vec3(0, 0, 0)), ground_ref, [mat_ground])

	# Setup 2D rendering to display eyes textures
	quad_layout = hg.VertexLayout()
	quad_layout.Begin().Add(hg.A_Position, 3, hg.AT_Float).Add(hg.A_TexCoord0, 3, hg.AT_Float).End()

	quad_model = hg.CreatePlaneModel(quad_layout, 1, 1, 1, 1)
	quad_render_state = hg.ComputeRenderState(hg.BM_Alpha, hg.DT_Disabled, hg.FC_Disabled)

	eye_t_size = res_x / 2.5
	eye_t_x = (res_x - 2 * eye_t_size) / 6 + eye_t_size / 2
	quad_matrix = hg.TransformationMat4(hg.Vec3(0, 0, 0), hg.Vec3(hg.Deg(90), hg.Deg(0), hg.Deg(0)), hg.Vec3(eye_t_size, 1, eye_t_size))

	tex0_program = hg.LoadProgramFromAssets("shaders/sprite")

	quad_uniform_set_value_list = hg.UniformSetValueList()
	quad_uniform_set_value_list.clear()
	quad_uniform_set_value_list.push_back(hg.MakeUniformSetValue("color", hg.Vec4(1, 1, 1, 1)))

	quad_uniform_set_texture_list = hg.UniformSetTextureList()

	# Main loop
	while not hg.ReadKeyboard().Key(hg.K_Escape) and hg.IsWindowOpen(win):
		dt = hg.TickClock()

		scene.Update(dt)

		actor_body_mtx = hg.TransformationMat4(hg.Vec3(-1.3, .45, -2), hg.Vec3(0, 0, 0))

		vr_state = hg.OpenVRGetState(actor_body_mtx, 0.01, 1000)
		left, right = hg.OpenVRStateToViewState(vr_state)

		vid = 0  # keep track of the next free view id
		passId = hg.SceneForwardPipelinePassViewId()

		# Prepare view-independent render data once
		vid, passId = hg.PrepareSceneForwardPipelineCommonRenderData(vid, scene, render_data, pipeline, res, passId)
		vr_eye_rect = hg.IntRect(0, 0, vr_state.width, vr_state.height)

		# Prepare the left eye render data then draw to its framebuffer
		vid, passId = hg.PrepareSceneForwardPipelineViewDependentRenderData(vid, left, scene, render_data, pipeline, res, passId)
		vid, passId = hg.SubmitSceneToForwardPipeline(vid, scene, vr_eye_rect, left, pipeline, render_data, res, vr_left_fb.GetHandle())

		# Prepare the right eye render data then draw to its framebuffer
		vid, passId = hg.PrepareSceneForwardPipelineViewDependentRenderData(vid, right, scene, render_data, pipeline, res, passId)
		vid, passId = hg.SubmitSceneToForwardPipeline(vid, scene, vr_eye_rect, right, pipeline, render_data, res, vr_right_fb.GetHandle())

		# Display the VR eyes texture to the backbuffer
		hg.SetViewRect(vid, 0, 0, res_x, res_y)
		vs = hg.ComputeOrthographicViewState(hg.TranslationMat4(hg.Vec3(0, 0, 0)), res_y, 0.1, 100, hg.ComputeAspectRatioX(res_x, res_y))
		hg.SetViewTransform(vid, vs.view, vs.proj)

		quad_uniform_set_texture_list.clear()
		quad_uniform_set_texture_list.push_back(hg.MakeUniformSetTexture("s_tex", hg.OpenVRGetColorTexture(vr_left_fb), 0))
		hg.SetT(quad_matrix, hg.Vec3(eye_t_x, 0, 1))
		hg.DrawModel(vid, quad_model, tex0_program, quad_uniform_set_value_list, quad_uniform_set_texture_list, quad_matrix, quad_render_state)

		quad_uniform_set_texture_list.clear()
		quad_uniform_set_texture_list.push_back(hg.MakeUniformSetTexture("s_tex", hg.OpenVRGetColorTexture(vr_right_fb), 0))
		hg.SetT(quad_matrix, hg.Vec3(-eye_t_x, 0, 1))
		hg.DrawModel(vid, quad_model, tex0_program, quad_uniform_set_value_list, quad_uniform_set_texture_list, quad_matrix, quad_render_state)

		hg.Frame()
		hg.OpenVRSubmitFrame(vr_left_fb, vr_right_fb)

		hg.UpdateWindow(win)

	hg.DestroyForwardPipeline(pipeline)
	hg.RenderShutdown()
	hg.DestroyWindow(win)

main()