Ejemplo n.º 1
0
Archivo: hello.go Proyecto: rdterner/gl
func render(w *glfw.Window, r *gResources) {

	/*
		width, height := w.GetFramebufferSize()
		gl.Viewport(0, 0, int32(width), int32(height))
		gl.Clear(gl.COLOR_BUFFER_BIT)

		gl.MatrixMode(gl.PROJECTION)
		gl.LoadIdentity()

		gl.MatrixMode(gl.MODELVIEW)
		gl.LoadIdentity()
	*/

	////////////////

	gl.UseProgram(r.program)

	gl.Uniform1f(r.uniforms.fadeFactor, r.fadeFactor)

	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, r.textures[0])
	gl.Uniform1i(r.uniforms.textures[0], 0)

	gl.ActiveTexture(gl.TEXTURE1)
	gl.BindTexture(gl.TEXTURE_2D, r.textures[1])
	gl.Uniform1i(r.uniforms.textures[1], 1)

	gl.BindBuffer(gl.ARRAY_BUFFER, r.vertexBuffer)
	gl.VertexAttribPointer(
		uint32(r.attributes.position), /* attribute */
		2,               /* size */
		gl.FLOAT,        /* type */
		false,           /* normalized? */
		8,               /* stride */
		gl.PtrOffset(0)) /* array buffer offset */

	gl.EnableVertexAttribArray(uint32(r.attributes.position))

	gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, r.elementBuffer)
	gl.DrawElements(
		gl.TRIANGLE_STRIP, /* mode */
		4,                 /* count */
		gl.UNSIGNED_INT,   /* type */
		gl.PtrOffset(0))   /* element array buffer offset */

	gl.DisableVertexAttribArray(uint32(r.attributes.position))

}
Ejemplo n.º 2
0
func (r *Renderer) Render() {
	// defer glfw.Terminate()
	shader := r.Shaders.textureFlat
	program := shader.program
	//
	gl.UseProgram(program)
	//
	gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))
	// // Configure global settings
	gl.Enable(gl.DEPTH_TEST)
	gl.DepthFunc(gl.LESS)
	gl.ClearColor(1.0, 1.0, 1.0, 1.0)

	//
	// angle += elapsed
	// r.Mesh.modelView = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})

	// Render
	// gl.UniformMatrix4fv(shader.uniforms["modelView"], 1, false, &r.Mesh.modelView[0])

	time := glfw.GetTime()
	_ = time - r.PreviousTime
	r.PreviousTime = time

	// fmt.Println(elapsed * 100)

	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	gl.UniformMatrix4fv(shader.uniforms["projection"], 1, false, &r.Projection[0])
	gl.UniformMatrix4fv(shader.uniforms["camera"], 1, false, &r.Camera[0])

	// TODO : batch triangles and use multiple textures
	for _, mesh := range r.Meshes {
		gl.UniformMatrix4fv(shader.uniforms["modelView"], 1, false, &mesh.modelView[0])
		gl.Uniform1i(shader.uniforms["tex"], 0)

		gl.BindVertexArray(mesh.vao)

		gl.ActiveTexture(gl.TEXTURE0)
		gl.BindTexture(gl.TEXTURE_2D, mesh.textures[0])

		gl.DrawArrays(gl.TRIANGLES, 0, int32(len(mesh.verticies)/5))
	}

	// Maintenance
	r.Window.SwapBuffers()
	glfw.PollEvents()
	if r.Ready == false {
		r.Ready = true
	}
}
Ejemplo n.º 3
0
Archivo: gl.go Proyecto: gmacd/rt
func updateScreenTexture(texture uint32, pixels []maths.Rgba, width, height int) {
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexSubImage2D(
		gl.TEXTURE_2D,
		0,
		0,
		0,
		int32(width),
		int32(height),
		gl.RGBA,
		gl.FLOAT,
		gl.Ptr(pixels))
}
func (loader *Loader) LoadTexture(file string) (uint32, error) {
	imgFile, err := os.Open(file)
	if err != nil {
		// Get the Folder of the current Executable
		dir, err := osext.ExecutableFolder()
		if err != nil {
			return 0, err
		}

		// Read the file and return content or error
		var secondErr error
		imgFile, secondErr = os.Open(fmt.Sprintf("%s/%s", dir, file))
		if secondErr != nil {
			return 0, secondErr
		}
	}

	img, _, err := image.Decode(imgFile)
	if err != nil {
		return 0, err
	}

	rgba := image.NewRGBA(img.Bounds())
	if rgba.Stride != rgba.Rect.Size().X*4 {
		return 0, fmt.Errorf("unsupported stride")
	}
	draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)

	var texture uint32
	gl.GenTextures(1, &texture)
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
	gl.TexImage2D(
		gl.TEXTURE_2D,
		0,
		gl.RGBA,
		int32(rgba.Rect.Size().X),
		int32(rgba.Rect.Size().Y),
		0,
		gl.RGBA,
		gl.UNSIGNED_BYTE,
		gl.Ptr(rgba.Pix))

	return texture, nil
}
Ejemplo n.º 5
0
Archivo: gl.go Proyecto: gmacd/rt
func createScreenTexture(width, height int) uint32 {
	var texture uint32
	gl.GenTextures(1, &texture)
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
	gl.TexImage2D(
		gl.TEXTURE_2D,
		0,
		gl.RGBA32F,
		int32(width),
		int32(height),
		0,
		gl.RGBA,
		gl.FLOAT,
		nil)

	return texture
}
Ejemplo n.º 6
0
func createTexture(file string) (uint32, error) {
	imgFile, err := os.Open(file)
	if err != nil {
		return 0, err
	}
	img, _, err := image.Decode(imgFile)
	if err != nil {
		return 0, err
	}

	rgba := image.NewRGBA(img.Bounds())
	if rgba.Stride != rgba.Rect.Size().X*4 {
		return 0, fmt.Errorf("unsupported stride")
	}
	draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)

	var texture uint32
	gl.GenTextures(1, &texture)
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
	gl.TexImage2D(
		gl.TEXTURE_2D,
		0,
		gl.RGBA,
		int32(rgba.Rect.Size().X),
		int32(rgba.Rect.Size().Y),
		0,
		gl.RGBA,
		gl.UNSIGNED_BYTE,
		gl.Ptr(rgba.Pix))

	return texture, nil
}
func (objectLoader *WavefrontObject) DrawObject(shaderProgram uint32) {
	for _, object := range objectLoader.Objects {
		// Reads the uniform Locations
		modelUniform := gl.GetUniformLocation(shaderProgram, gl.Str("model\x00"))
		ambientUniform := gl.GetUniformLocation(shaderProgram, gl.Str("ambient\x00"))
		diffuseUniform := gl.GetUniformLocation(shaderProgram, gl.Str("diffuse\x00"))
		specularUniform := gl.GetUniformLocation(shaderProgram, gl.Str("specular\x00"))
		emissiveUniform := gl.GetUniformLocation(shaderProgram, gl.Str("emissive\x00"))

		// Send our uniforms variables to the currently bound shader
		if object.Material != nil {
			gl.Uniform4f(ambientUniform, object.Material.KaR, object.Material.KaG, object.Material.KaB, object.Material.Tr)  // Ambient colour.
			gl.Uniform4f(diffuseUniform, object.Material.KdR, object.Material.KdG, object.Material.KdB, object.Material.Tr)  // Diffuse colour.
			gl.Uniform4f(specularUniform, object.Material.KsR, object.Material.KsG, object.Material.KsB, object.Material.Tr) // Specular colour.
			gl.Uniform4f(emissiveUniform, object.Material.KeR, object.Material.KeG, object.Material.KeB, object.Material.Tr) // Emissive colour.

			if object.Material.Texture != 0 {
				textureUniform := gl.GetUniformLocation(shaderProgram, gl.Str("DiffuseTextureSampler\x00"))
				gl.Uniform1i(textureUniform, 0)

				normalTextureUniform := gl.GetUniformLocation(shaderProgram, gl.Str("NormalTextureSampler\x00"))
				gl.Uniform1i(normalTextureUniform, 1)

				specularTextureUniform := gl.GetUniformLocation(shaderProgram, gl.Str("SpecularTextureSampler\x00"))
				gl.Uniform1i(specularTextureUniform, 2)

				gl.ActiveTexture(gl.TEXTURE0)
				gl.BindTexture(gl.TEXTURE_2D, object.Material.Texture)

				gl.ActiveTexture(gl.TEXTURE1)
				gl.BindTexture(gl.TEXTURE_2D, object.Material.NormalMap)

				gl.ActiveTexture(gl.TEXTURE2)
				gl.BindTexture(gl.TEXTURE_2D, object.Material.SpecularMap)
			}

			if object.Material.Tr < 1.0 {
				// Enables Transparencies
				gl.Enable(gl.BLEND)
				//				gl.BlendFunc(gl.SRC_COLOR, gl.ONE)
				//				gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
				gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
			}
		}

		// Geometry
		var size int32 // Used to get the byte size of the element (vertex index) array

		gl.UniformMatrix4fv(modelUniform, 1, false, &object.Model[0])

		// Get the vertices uniform position
		verticesUniform := uint32(gl.GetAttribLocation(shaderProgram, gl.Str("position\x00")))
		normalsUniform := uint32(gl.GetAttribLocation(shaderProgram, gl.Str("normal\x00")))
		textureCoordinatesUniform := uint32(gl.GetAttribLocation(shaderProgram, gl.Str("texcoord\x00")))

		// Describe our vertices array to OpenGL (it can't guess its format automatically)

		gl.BindBuffer(gl.ARRAY_BUFFER, object.VertexBufferObjectVertices)
		gl.VertexAttribPointer(
			verticesUniform, // attribute index
			3,               // number of elements per vertex, here (x,y,z)
			gl.FLOAT,        // the type of each element
			false,           // take our values as-is
			0,               // no extra data between each position
			nil,             // offset of first element
		)

		gl.EnableVertexAttribArray(normalsUniform)
		gl.BindBuffer(gl.ARRAY_BUFFER, object.VertexBufferObjectNormals)
		gl.VertexAttribPointer(
			normalsUniform, // attribute
			3,              // number of elements per vertex, here (x,y,z)
			gl.FLOAT,       // the type of each element
			false,          // take our values as-is
			0,              // no extra data between each position
			nil,            // offset of first element
		)

		gl.EnableVertexAttribArray(textureCoordinatesUniform)
		gl.BindBuffer(gl.ARRAY_BUFFER, object.VertexBufferObjectTextureCoords)
		gl.VertexAttribPointer(
			textureCoordinatesUniform, // attribute
			2,        // number of elements per vertex, here (u,v)
			gl.FLOAT, // the type of each element
			false,    // take our values as-is
			0,        // no extra data between each position
			nil,      // offset of first element
		)

		size = int32(len(object.Vertex))

		gl.PointSize(3.0)

		// Enable this line to show model in wireframe
		switch objectLoader.DrawMode {
		case 1:
			gl.PolygonMode(gl.FRONT_AND_BACK, gl.LINE)
		default:
			gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
		}

		gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, object.VertexBufferObjectFaces)
		gl.GetBufferParameteriv(gl.ELEMENT_ARRAY_BUFFER, gl.BUFFER_SIZE, &size)
		gl.DrawElements(gl.TRIANGLES, int32(len(object.Faces)), gl.UNSIGNED_SHORT, nil)
		//		gl.DrawElements(gl.POINTS, int32(len(object.Faces)), gl.UNSIGNED_SHORT, nil)

		// Disables transparencies
		gl.Disable(gl.BLEND)
	}
}