C++ Framebuffer::Bind方法代码示例

	void RenderFrameShadowMap(
		const Vec3f& light_position,
		const Mat4f& torus_matrix,
		const Mat4f& light_proj_matrix
	)
	{
		frame_shadow_fbo.Bind(Framebuffer::Target::Draw);

		gl.Viewport(shadow_tex_side, shadow_tex_side);
		gl.ClearDepthBuffer(1.0f);
		gl.CullFace(Face::Back);

		transf_prog.camera_matrix.Set(light_proj_matrix);
		transf_prog.camera_position.Set(light_position);

		// Render the torus' frame
		transf_prog.model_matrix.Set(torus_matrix);

		shadow_pp.Bind();

		gl.Enable(Capability::PolygonOffsetFill);
		torus.Draw(
			[](GLuint phase) -> bool
			{
				return (phase <= 3);
			}
		);
		gl.Disable(Capability::PolygonOffsetFill);
	}

	void RenderGlassShadowMap(
		const Vec3f& light_position,
		const Vec3f& torus_center,
		const Mat4f& torus_matrix,
		const Mat4f& light_proj_matrix
	)
	{
		glass_shadow_fbo.Bind(Framebuffer::Target::Draw);

		gl.Viewport(shadow_tex_side, shadow_tex_side);
		const GLfloat clear_color[4] = {1.0f, 1.0f, 1.0f, 0.0f};
		gl.ClearColorBuffer(0, clear_color);

		transf_prog.camera_matrix.Set(light_proj_matrix);
		transf_prog.camera_position.Set(light_position);
		transf_prog.light_proj_matrix.Set(light_proj_matrix);
		transf_prog.light_position.Set(light_position);

		// Render the torus' frame
		transf_prog.model_matrix.Set(torus_matrix);

		// setup the view clipping plane
		Planef clip_plane = Planef::FromPointAndNormal(
			torus_center,
			Normalized(light_position-torus_center)
		);
		transf_prog.clip_plane.Set(clip_plane.Equation());

		light_pp.Bind();

		light_prog.color = Vec3f(0.6f, 0.4f, 0.1f);

		gl.Disable(Capability::DepthTest);
		gl.Enable(Functionality::ClipDistance, 0);
		gl.Enable(Capability::Blend);

		for(int c=0; c!=2; ++c)
		{
			transf_prog.clip_direction.Set((c == 0)?1:-1);

			for(int p=3; p>=0; --p)
			{
				if(p % 2 == 0) gl.CullFace(Face::Front);
				else gl.CullFace(Face::Back);
				torus.Draw(
					[&p](GLuint phase) -> bool
					{
						if(p == 0 || p == 3)
						{
							return (phase == 4);
						}
						else return (phase > 4);
					}
				);
			}
		}
		gl.Disable(Capability::Blend);
		gl.Disable(Functionality::ClipDistance, 0);
		gl.Enable(Capability::DepthTest);
	}

	void Update(double time)
	{
		gl.Viewport(size, size);

		fbo.Bind(Framebuffer::Target::Draw);
		Framebuffer::AttachColorTexture(
			Framebuffer::Target::Draw,
			1,
			holder.CurrentHeightMap(),
			0
		);
		Context::ColorBuffer draw_buffs[2] = {
			FramebufferColorAttachment::_0,
			FramebufferColorAttachment::_1
		};
		gl.DrawBuffers(draw_buffs);

		prog.Use();
		prog.hmap_1.Set(holder.HMapUnit1());
		prog.hmap_2.Set(holder.HMapUnit2());
		prog.time.Set(time);

		screen.Use();

		gl.Disable(Capability::DepthTest);
		screen.Draw();
		gl.Enable(Capability::DepthTest);

		holder.Swap();
	}

	void Render(double time)
	{
		auto camera =
			CamMatrixf::Roll(Degrees(SineWave(time / 11.0)*7+SineWave(time/13.0)*5))*
			CamMatrixf::Orbiting(
				Vec3f(),
				40.0f,
				Degrees(SineWave(time / 11.0)*10+CosineWave(time/19.0)*10-90),
				Degrees(SineWave(time / 17.0)*10+SineWave(time/13.0)*10)
			);

		auto mm_identity = ModelMatrixf();
		auto mm_rotation = ModelMatrixf::RotationZ(FullCircles(time / 7.0));

		Uniform<Mat4f>* model_matrix = nullptr;

		GLuint drawing_fan = fan_index;
		auto drawing_driver =
			[
				&model_matrix,
				&mm_identity,
				&mm_rotation,
				&drawing_fan
			](GLuint phase) -> bool
			{
				if(phase == drawing_fan)
					model_matrix->Set(mm_rotation);
				else model_matrix->Set(mm_identity);
				return true;
			};

		// render the light mask
		light_fbo.Bind(Framebuffer::Target::Draw);

		gl.Clear().ColorBuffer().DepthBuffer();

		mask_vao.Bind();
		mask_prog.Use();
		mask_prog.camera_matrix.Set(camera);
		model_matrix = &mask_prog.model_matrix;

		meshes.Draw(drawing_driver);

		// render the final image
		DefaultFramebuffer().Bind(Framebuffer::Target::Draw);

		gl.Clear().ColorBuffer().DepthBuffer();

		draw_vao.Bind();
		draw_prog.Use();
		Vec4f lsp = projection * camera * Vec4f(light_position, 1.0);
		draw_prog.light_screen_pos = lsp.xyz()/lsp.w();
		draw_prog.camera_matrix.Set(camera);
		model_matrix = &draw_prog.model_matrix;

		meshes.Draw(drawing_driver);
	}

	void Use(void)
	{
		gl.ClearDepth(1.0f);
		gl.ClearColor(0.9f, 0.4f, 0.4f, 1.0f);

		gl.Enable(Capability::DepthTest);
		gl.Enable(Capability::CullFace);
		gl.CullFace(Face::Back);

		fbo.Bind(Framebuffer::Target::Draw);
		gl.Viewport(tex_side, tex_side);

		prog.Use();
		shape.Use();

		projection_matrix.Set(CamMatrixf::PerspectiveX(Degrees(48), 1.0, 1, 100));
	}

	FlowSimulator(
		const images::Image& flow_map_image,
		GLuint first_tex_unit
	): size(1024)
	 , prog(size)
	 , holder(size, first_tex_unit, flow_map_image)
	 , screen(List("Position")("TexCoord").Get(), shapes::Screen(), prog)
	{
	 	Uniform<SLtoCpp<SLDataType::Sampler2D>> flow_map(prog, "FlowMap");
		flow_map.Set(holder.FlowMapUnit());

		fbo.Bind(Framebuffer::Target::Draw);
		Framebuffer::AttachColorTexture(
			Framebuffer::Target::Draw,
			0,
			holder.BumpMap(),
			0
		);
	}

	void SetupLightMask(void)
	{
		Texture::Active(light_tex_unit);
		Texture::Target tex_tgt = Texture::Target::Rectangle;
		light_mask.Bind(tex_tgt);

		draw_prog.Use();
		UniformSampler(draw_prog, "LightMap").Set(GLuint(light_tex_unit));

		Texture::MinFilter(tex_tgt, TextureMinFilter::Linear);
		Texture::MagFilter(tex_tgt, TextureMagFilter::Linear);
		Texture::WrapS(tex_tgt, TextureWrap::ClampToEdge);
		Texture::WrapT(tex_tgt, TextureWrap::ClampToEdge);

		Framebuffer::Target fbo_tgt = Framebuffer::Target::Draw;
		light_fbo.Bind(fbo_tgt);
		Framebuffer::AttachTexture(fbo_tgt, FramebufferAttachment::Color, light_mask, 0);

		Renderbuffer::Target rbo_tgt = Renderbuffer::Target::Renderbuffer;
		light_rbo.Bind(rbo_tgt);
		Framebuffer::AttachRenderbuffer(fbo_tgt, FramebufferAttachment::Depth, light_rbo);
	}

	void Bind(void)
	{
		fbo.Bind(Framebuffer::Target::Draw);
	}

	void Render(double time)
	{
		// render into the texture
		fbo.Bind(Framebuffer::Target::Draw);
		gl.Viewport(tex_side, tex_side);
		gl.ClearDepth(1.0f);
		gl.ClearColor(0.4f, 0.9f, 0.4f, 1.0f);
		gl.Clear().ColorBuffer().DepthBuffer();
		torus_prog.Use();

		torus_projection_matrix.Set(
			CamMatrixf::PerspectiveX(Degrees(60), 1.0, 1, 30)
		);

		torus_camera_matrix.Set(
			CamMatrixf::Orbiting(
				Vec3f(),
				3.5,
				Degrees(time * 25),
				Degrees(SineWave(time / 30.0) * 90)
			)
		);

		torus_model_matrix.Set(
			ModelMatrixf::RotationA(
				Vec3f(1.0f, 1.0f, 1.0f),
				FullCircles(time * 0.5)
			)
		);

		torus.Bind();
		gl.FrontFace(make_torus.FaceWinding());
		torus_instr.Draw(torus_indices);

		// render the textured cube
		Framebuffer::BindDefault(Framebuffer::Target::Draw);
		gl.Viewport(width, height);
		gl.ClearDepth(1.0f);
		gl.ClearColor(0.8f, 0.8f, 0.8f, 0.0f);
		gl.Clear().ColorBuffer().DepthBuffer();
		cube_prog.Use();

		cube_projection_matrix.Set(
			CamMatrixf::PerspectiveX(
				Degrees(70),
				double(width)/height,
				1, 30
			)
		);

		cube_camera_matrix.Set(
			CamMatrixf::Orbiting(
				Vec3f(),
				3.0,
				Degrees(time * 35),
				Degrees(SineWave(time / 20.0) * 60)
			)
		);

		cube_model_matrix.Set(
			ModelMatrixf::RotationX(FullCircles(time * 0.25))
		);

		cube.Bind();
		gl.FrontFace(make_cube.FaceWinding());
		cube_instr.Draw(cube_indices);
	}

	void RenderShadowMap(GLuint size)
	{
		// matrices
		auto lt_proj= CamMatrixf::PerspectiveX(Degrees(12), 1.0, 85.0, 110.0);
		auto light = CamMatrixf::LookingAt(light_position, Vec3f());
		// setup the texture
		Texture::Active(shadow_tex_unit);

		mask_prog.Use();
		Uniform<Mat4f>(mask_prog, "LightMatrix").Set(lt_proj*light);
		UniformSampler(mask_prog, "ShadowMap").Set(GLuint(shadow_tex_unit));

		draw_prog.Use();
		Uniform<Mat4f>(draw_prog, "LightMatrix").Set(lt_proj*light);
		UniformSampler(draw_prog, "ShadowMap").Set(GLuint(shadow_tex_unit));

		Texture::Target tex_tgt = Texture::Target::_2D;
		shadow_map.Bind(tex_tgt);
		Texture::MinFilter(tex_tgt, TextureMinFilter::Linear);
		Texture::MagFilter(tex_tgt, TextureMagFilter::Linear);
		Texture::WrapS(tex_tgt, TextureWrap::ClampToEdge);
		Texture::WrapT(tex_tgt, TextureWrap::ClampToEdge);
		Texture::CompareMode(tex_tgt, TextureCompareMode::CompareRefToTexture);
		Texture::Image2D(
			tex_tgt,
			0,
			PixelDataInternalFormat::DepthComponent32,
			size, size,
			0,
			PixelDataFormat::DepthComponent,
			PixelDataType::Float,
			nullptr
		);

		// create shadow program
		ShadowProgram shadow_prog(vert_shader);

		// VAO for the meshes in shadow program
		VertexArray vao = meshes.VAOForProgram(shadow_prog);
		vao.Bind();

		// FBO for offscreen rendering of the shadow map
		Framebuffer::Target fbo_tgt = Framebuffer::Target::Draw;
		Framebuffer fbo;
		fbo.Bind(fbo_tgt);
		Framebuffer::AttachTexture(fbo_tgt, FramebufferAttachment::Depth, shadow_map, 0);

		// RBO for offscreen rendering
		Renderbuffer::Target rbo_tgt = Renderbuffer::Target::Renderbuffer;
		Renderbuffer rbo;
		rbo.Bind(rbo_tgt);
		Renderbuffer::Storage(rbo_tgt, PixelDataInternalFormat::RGBA, size, size);
		Framebuffer::AttachRenderbuffer(fbo_tgt, FramebufferAttachment::Color, rbo);

		// setup the matrices
		shadow_prog.projection_matrix.Set(lt_proj);
		shadow_prog.camera_matrix.Set(light);

		// setup and clear the viewport
		gl.Viewport(size, size);
		gl.Clear().DepthBuffer();

		// draw the meshes
		gl.PolygonOffset(1.0, 1.0);
		gl.Enable(Capability::PolygonOffsetFill);
		meshes.Draw();
		gl.Disable(Capability::PolygonOffsetFill);
		gl.Finish();

		// bind the default framebuffer
		DefaultFramebuffer().Bind(Framebuffer::Target::Draw);
	}

	void Render(double time)
	{
		//
		// the camera matrix
		Mat4f camera = CamMatrixf::Orbiting(
			Vec3f(),
			6.5 + SineWave(time / 16.0) * 1.5,
			FullCircles(time / 12.0),
			Degrees(SineWave(time / 30.0) * 90)
		);
		//
		// the model matrix
		Mat4f model = ModelMatrixf::RotationA(
			Vec3f(1.0f, 1.0f, 1.0f),
			FullCircles(time / 10.0)
		);
		// the light position
		Vec3f lightPos(0.0f, SineWave(time / 7.0) * 0.5, 0.0f);
		//
		SetProgramUniform(shape_prog, "LightPos", lightPos);
		SetProgramUniform(depth_prog, "LightPos", lightPos);
		SetProgramUniform(light_prog, "LightPos", lightPos);
		//
		SetProgramUniform(shape_prog, "CameraMatrix", camera);
		SetProgramUniform(light_prog, "CameraMatrix", camera);

		SetProgramUniform(shape_prog, "ModelMatrix", model);
		SetProgramUniform(depth_prog, "ModelMatrix", model);

		// render the shadow map
		depth_fbo.Bind(Framebuffer::Target::Draw);
		gl.DrawBuffer(ColorBuffer::None);

		gl.Viewport(tex_side, tex_side);
		gl.Clear().DepthBuffer();

		depth_prog.Use();
		shape.Bind();
		shape_instr.Draw(shape_indices);

		// render the output frame
		Framebuffer::BindDefault(Framebuffer::Target::Draw);
		gl.DrawBuffer(ColorBuffer::Back);

		gl.Viewport(width, height);
		gl.Clear().ColorBuffer().DepthBuffer();


		shape_prog.Use();
		shape.Bind();
		shape_instr.Draw(shape_indices);

		gl.Enable(Capability::Blend);

		light_prog.Use();
		SetUniform(light_prog, "ViewX", camera.Row(0).xyz());
		SetUniform(light_prog, "ViewY", camera.Row(1).xyz());
		SetUniform(light_prog, "ViewZ", camera.Row(2).xyz());

		light.Bind();
		gl.DrawArraysInstanced(
			PrimitiveType::Points,
			0, 1,
			sample_count
		);

		gl.Disable(Capability::Blend);
	}