Exemplo n.º 1
0
func (tr *TextRenderer) Draw(tex *Texture, x, y, scale float32) (err error) {
	gl.ActiveTexture(gl.TEXTURE0)
	if e := gl.GetError(); e != 0 {
		return fmt.Errorf("ERROR: %X", e)
	}
	gl.BindTexture(gl.TEXTURE_2D, tex.Texture)
	if e := gl.GetError(); e != 0 {
		return fmt.Errorf("ERROR: %X", e)
	}
	gl.Uniform3f(tr.ScaleLoc, float32(tex.Width)*scale, float32(tex.Height)*scale, 1)
	if e := gl.GetError(); e != 0 {
		return fmt.Errorf("ERROR: %X", e)
	}
	gl.Uniform3f(tr.TransLoc, x, y, 0)
	if e := gl.GetError(); e != 0 {
		return fmt.Errorf("ERROR: %X", e)
	}
	gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
	if e := gl.GetError(); e != 0 {
		return fmt.Errorf("ERROR: %X", e)
	}
	gl.BindBuffer(gl.ARRAY_BUFFER, 0)
	if e := gl.GetError(); e != 0 {
		return fmt.Errorf("ERROR: %X", e)
	}
	return nil
}
Exemplo n.º 2
0
func Draw() {

	// if len(layers) == 0 {
	// 	fmt.Println("layers empty!!!")
	// 	return
	// }

	// for _, layer := range layers {

	// vertexData := textureHash[layer]
	vertexData := &vertexDataTest

	// check to see if there are any vertices at all to draw
	if len(vertexData.vertexData) == 0 {
		return
	}

	//	vertexData.Print()

	// vertexData := vertexDataTest

	//vertexData.Print()
	// BindBuffers(vertexData)
	// vertexData.Print()
	//gl.BufferSubData(gl.ARRAY_BUFFER, 0, len(vertexData.VertexData)*4, gl.Ptr(vertexData.VertexData))

	// gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
	gl.BufferData(gl.ARRAY_BUFFER, len(vertexData.vertexData)*4, gl.Ptr(vertexData.vertexData), gl.DYNAMIC_DRAW)
	// gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, elementvbo)
	// gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(vertexData.Elements)*4, gl.Ptr(vertexData.Elements), gl.DYNAMIC_DRAW)

	MVP := projectionM.Mul4(viewM) //.Mul4(Model)

	gl.UniformMatrix4fv(MVPid, 1, false, &MVP[0])

	lightPos := mathgl.Vec3{0, 3, 10}
	lightintensities := mathgl.Vec3{1, .4, .2}
	gl.Uniform3f(lightpositionID, lightPos[0], lightPos[1], lightPos[2])
	gl.Uniform3f(lightintensitiesID, lightintensities[0], lightintensities[1], lightintensities[2])
	gl.Uniform3f(cameraPositionID, 0.0, 1.0, -1.0)

	// vertexData.Print()
	// gl.DrawElements(gl.TRIANGLES, int32(len(vertexData.Elements)), gl.UNSIGNED_INT, nil)
	// }

	numTriVerts := int32((len(vertexData.vertexData) / (int(NUM_ATTRIBUTES) * 2)) * 3)

	gl.DrawArrays(gl.TRIANGLES, 0, numTriVerts)

	ClearVertexData()
}
Exemplo n.º 3
0
// RenderString must be called on the render thread.  x and y are the initial position of the pen,
// in screen coordinates, and height is the height of a full line of text, in screen coordinates.
func (d *Dictionary) RenderString(str string, x, y, height float64) {
	if str == "" {
		return
	}
	// No synchronization necessary because everything is run serially on the render thread anyway.
	if d.strs == nil {
		d.strs = make(map[string]strData)
	}
	data, ok := d.strs[str]
	if !ok {
		data = d.bindString(str)
		d.strs[str] = data
	}

	render.EnableShader("glop.font")
	defer render.EnableShader("")

	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, d.atlas.texture)
	location, _ := render.GetUniformLocation("glop.font", "tex")
	gl.Uniform1i(location, 0)
	gl.BindSampler(0, d.atlas.sampler)

	location, _ = render.GetUniformLocation("glop.font", "height")
	gl.Uniform1f(location, float32(height))

	var viewport [4]int32
	gl.GetIntegerv(gl.VIEWPORT, &viewport[0])
	location, _ = render.GetUniformLocation("glop.font", "screen")
	gl.Uniform2f(location, float32(viewport[2]), float32(viewport[3]))

	location, _ = render.GetUniformLocation("glop.font", "pen")
	gl.Uniform2f(location, float32(x)+float32(viewport[0]), float32(y)+float32(viewport[1]))

	location, _ = render.GetUniformLocation("glop.font", "textColor")
	gl.Uniform3f(location, d.color[0], d.color[1], d.color[2])

	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	gl.BindVertexArray(data.varrays[0])
	gl.DrawArrays(gl.TRIANGLES, 0, data.count)
}
Exemplo n.º 4
0
func (r *EffectsRenderer) Draw() (err error) {
	gl.UseProgram(r.shader)
	gl.Uniform1i(r.textureUnitLoc, 0)
	gl.Uniform3f(r.colorLoc, r.Color[0], r.Color[1], r.Color[2])
	gl.BindBuffer(gl.ARRAY_BUFFER, r.coords)
	gl.EnableVertexAttribArray(r.positionLoc)
	gl.VertexAttribPointer(r.positionLoc, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
	gl.EnableVertexAttribArray(r.textureLoc)
	gl.VertexAttribPointer(r.textureLoc, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))

	gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
	gl.Viewport(0, 0, int32(r.oldwidth), int32(r.oldheight))
	gl.BlendFunc(gl.ONE, gl.ONE)
	gl.BindTexture(gl.TEXTURE_2D, r.texture)
	gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)

	gl.BindBuffer(gl.ARRAY_BUFFER, 0)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	return nil
}
Exemplo n.º 5
0
func main() {
	vertices, normals := obj.Parse(os.Args[1])

	// initialize GLFW
	if err := glfw.Init(); err != nil {
		panic(err)
	}
	defer glfw.Terminate()

	// set opengl core profile 3.3
	glfw.WindowHint(glfw.ContextVersionMajor, 3)
	glfw.WindowHint(glfw.ContextVersionMinor, 3)
	glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
	glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)

	window, err := glfw.CreateWindow(640, 480, "GOpenGL", nil, nil)
	if err != nil {
		panic(err)
	}
	window.MakeContextCurrent()

	// initialise OpenGL library
	if err := gl.Init(); err != nil {
		panic(err)
	}

	// link program from shaders
	program, err := newProgram("vertex.glsl", "fragment.glsl")
	if err != nil {
		panic(err)
	}
	gl.UseProgram(program)

	// vertex attribute object holds links between attributes and vbo
	var vao uint32
	gl.GenVertexArrays(1, &vao)
	gl.BindVertexArray(vao)

	// vertex buffer with per-vertex data
	var vbo [2]uint32
	gl.GenBuffers(2, &vbo[0])

	// position data
	gl.BindBuffer(gl.ARRAY_BUFFER, vbo[0])
	gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*4, gl.Ptr(vertices), gl.STATIC_DRAW)

	// set up position attribute with layout of vertices
	posAttrib := uint32(gl.GetAttribLocation(program, gl.Str("position\x00")))
	gl.VertexAttribPointer(posAttrib, 3, gl.FLOAT, false, 3*4, gl.PtrOffset(0))
	gl.EnableVertexAttribArray(posAttrib)

	// normal data
	gl.BindBuffer(gl.ARRAY_BUFFER, vbo[1])
	gl.BufferData(gl.ARRAY_BUFFER, len(normals)*4, gl.Ptr(normals), gl.STATIC_DRAW)

	normAttrib := uint32(gl.GetAttribLocation(program, gl.Str("normal\x00")))
	gl.VertexAttribPointer(normAttrib, 3, gl.FLOAT, false, 3*4, gl.PtrOffset(0))
	gl.EnableVertexAttribArray(normAttrib)

	uniModel := gl.GetUniformLocation(program, gl.Str("model\x00"))
	uniView := gl.GetUniformLocation(program, gl.Str("view\x00"))
	uniProj := gl.GetUniformLocation(program, gl.Str("proj\x00"))

	matView := mgl32.LookAt(2.0, 2.0, 2.0,
		0.0, 0.0, 0.0,
		0.0, 0.0, 1.0)
	gl.UniformMatrix4fv(uniView, 1, false, &matView[0])

	matProj := mgl32.Perspective(mgl32.DegToRad(45.0), 640.0/480.0, 1.0, 10.0)
	gl.UniformMatrix4fv(uniProj, 1, false, &matProj[0])

	uniLightDir := gl.GetUniformLocation(program, gl.Str("lightDir\x00"))
	uniLightCol := gl.GetUniformLocation(program, gl.Str("lightCol\x00"))

	gl.Uniform3f(uniLightDir, -0.5, 0.0, -1.0)
	gl.Uniform3f(uniLightCol, 0.0, 0.5, 0.5)

	startTime := glfw.GetTime()
	gl.Enable(gl.DEPTH_TEST)
	gl.ClearColor(1.0, 1.0, 1.0, 1.0)

	for !window.ShouldClose() {
		// clear buffer
		gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

		matRot := mgl32.HomogRotate3DZ(float32(glfw.GetTime() - startTime))
		gl.UniformMatrix4fv(uniModel, 1, false, &matRot[0])

		gl.DrawArrays(gl.TRIANGLES, 0, int32(len(vertices)))

		window.SwapBuffers()
		glfw.PollEvents()
	}
}
Exemplo n.º 6
0
func (r *Renderable) Draw(perspective mgl.Mat4, view mgl.Mat4) {
	gl.UseProgram(r.Shader)
	gl.BindVertexArray(r.Vao)

	model := r.GetTransformMat4()

	var mvp mgl.Mat4
	shaderMvp := getUniformLocation(r.Shader, "MVP_MATRIX")
	if shaderMvp >= 0 {
		mvp = perspective.Mul4(view).Mul4(model)
		gl.UniformMatrix4fv(shaderMvp, 1, false, &mvp[0])
	}

	shaderMv := getUniformLocation(r.Shader, "MV_MATRIX")
	if shaderMv >= 0 {
		mv := view.Mul4(model)
		gl.UniformMatrix4fv(shaderMv, 1, false, &mv[0])
	}

	shaderTex0 := getUniformLocation(r.Shader, "DIFFUSE_TEX")
	if shaderTex0 >= 0 {
		gl.ActiveTexture(gl.TEXTURE0)
		gl.BindTexture(gl.TEXTURE_2D, r.Tex0)
		gl.Uniform1i(shaderTex0, 0)
	}

	shaderColor := getUniformLocation(r.Shader, "MATERIAL_DIFFUSE")
	if shaderColor >= 0 {
		gl.Uniform4f(shaderColor, r.Color[0], r.Color[1], r.Color[2], r.Color[3])
	}

	shaderTex1 := getUniformLocation(r.Shader, "MATERIAL_TEX_0")
	if shaderTex1 >= 0 {
		gl.ActiveTexture(gl.TEXTURE0)
		gl.BindTexture(gl.TEXTURE_2D, r.Tex0)
		gl.Uniform1i(shaderTex1, 0)
	}

	shaderCameraWorldPos := getUniformLocation(r.Shader, "CAMERA_WORLD_POSITION")
	if shaderCameraWorldPos >= 0 {
		gl.Uniform3f(shaderCameraWorldPos, -view[12], -view[13], -view[14])
	}

	shaderPosition := getAttribLocation(r.Shader, "VERTEX_POSITION")
	if shaderPosition >= 0 {
		gl.BindBuffer(gl.ARRAY_BUFFER, r.VertVBO)
		gl.EnableVertexAttribArray(uint32(shaderPosition))
		gl.VertexAttribPointer(uint32(shaderPosition), 3, gl.FLOAT, false, 0, gl.PtrOffset(0))
	}

	shaderNormal := getAttribLocation(r.Shader, "VERTEX_NORMAL")
	if shaderNormal >= 0 {
		gl.BindBuffer(gl.ARRAY_BUFFER, r.NormsVBO)
		gl.EnableVertexAttribArray(uint32(shaderNormal))
		gl.VertexAttribPointer(uint32(shaderNormal), 3, gl.FLOAT, false, 0, gl.PtrOffset(0))
	}

	shaderVertUv := getAttribLocation(r.Shader, "VERTEX_UV_0")
	if shaderVertUv >= 0 {
		gl.BindBuffer(gl.ARRAY_BUFFER, r.UvVBO)
		gl.EnableVertexAttribArray(uint32(shaderVertUv))
		gl.VertexAttribPointer(uint32(shaderVertUv), 2, gl.FLOAT, false, 0, gl.PtrOffset(0))
	}

	gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, r.ElementsVBO)
	gl.DrawElements(gl.TRIANGLES, int32(r.FaceCount*3), gl.UNSIGNED_INT, gl.PtrOffset(0))
	gl.BindVertexArray(0)
}