func (t *Text) Draw() { if t.IsDebug { t.BoundingBox.Draw() } gl.UseProgram(t.font.program) gl.ActiveTexture(gl.TEXTURE0) gl.BindTexture(gl.TEXTURE_2D, t.font.textureID) // uniforms gl.Uniform1i(t.font.fragmentTextureUniform, 0) gl.Uniform4fv(t.font.colorUniform, 1, &t.color[0]) gl.Uniform2fv(t.font.finalPositionUniform, 1, &t.finalPosition[0]) gl.UniformMatrix4fv(t.font.orthographicMatrixUniform, 1, false, &t.font.OrthographicMatrix[0]) gl.UniformMatrix4fv(t.font.scaleMatrixUniform, 1, false, &t.scaleMatrix[0]) // draw drawCount := int32(t.RuneCount * 6) if drawCount > int32(t.eboIndexCount) { drawCount = int32(t.eboIndexCount) } if drawCount < 0 { drawCount = 0 } gl.Enable(gl.BLEND) gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA) gl.BindVertexArray(t.vao) gl.DrawElements(gl.TRIANGLES, drawCount, gl.UNSIGNED_INT, nil) gl.BindVertexArray(0) gl.Disable(gl.BLEND) }
//PreRender binds either the next post process fbo if there is one or unbinds any fbo to render to screen. Also disable depth test. func (ppfb *PostProcessFramebuffer) PreRender() { if ppfb.next != nil { ppfb.Fb.Bind(gl2.FRAMEBUFFER) } else { gl.BindFramebuffer(gl.FRAMEBUFFER, 0) } gl.Disable(gl.DEPTH_TEST) }
func SetPerspective(width, height int) { Projection := mathgl.Perspective(mathgl.DegToRad(45.0), float32(width/height), 0.1, 100.0) viewM = mathgl.LookAt(0.0, 0.0, 20.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0) projectionM = Projection gl.Disable(gl.CULL_FACE) gl.Enable(gl.DEPTH_TEST) }
func SetOrthographic(width, height int) { // Projection := mathgl.Perspective(45.0, winWidth/winHeight, 0.1, 100.0) // Projection := mathgl.Ortho2D(0.0, winWidth, winHeight, 0.0) // aspect := float32(s.width / s.height) Projection := mathgl.Ortho(0.0, float32(width), float32(height), 0.0, -5.0, 5.0) viewM = mathgl.LookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0) projectionM = Projection gl.Disable(gl.DEPTH_TEST) }
func (c *Context) CreateWindow(w, h int, name string) (err error) { c.w = w c.h = h c.name = name c.createWindow() c.SetCursor(c.cursor) gl.Init() if e := gl.GetError(); e != 0 { if e != gl.INVALID_ENUM { err = fmt.Errorf("OpenGL glInit error: %X\n", e) return } } c.OpenGLVersion = glfw.GetVersionString() c.ShaderVersion = gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION)) gl.Enable(gl.BLEND) gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA) gl.ClearColor(0.0, 0.0, 0.0, 1.0) gl.Disable(gl.CULL_FACE) glfw.SwapInterval(1) return }
func (c *Context) CreateWindow(w, h int, name string) (err error) { c.w = w c.h = h c.name = name var monitor *glfw.Monitor if c.fullscreen == true { monitor = glfw.GetPrimaryMonitor() } if c.window, err = glfw.CreateWindow(c.w, c.h, c.name, monitor, nil); err != nil { return } if c.cursor == false { c.window.SetInputMode(glfw.CursorMode, glfw.CursorHidden) } c.window.MakeContextCurrent() gl.Init() if e := gl.GetError(); e != 0 { if e == gl.INVALID_ENUM { fmt.Printf("GL_INVALID_ENUM when calling glInit\n") } else { err = fmt.Errorf("OpenGL glInit error: %X\n", e) return } } c.OpenGLVersion = glfw.GetVersionString() c.ShaderVersion = gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION)) gl.Enable(gl.BLEND) gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA) gl.ClearColor(0.0, 0.0, 0.0, 1.0) gl.Disable(gl.CULL_FACE) glfw.SwapInterval(1) if c.VAO, err = CreateVAO(); err != nil { return } gl.BindVertexArray(c.VAO) c.Events = NewEventHandler(c.window) return }
func (r *EffectsRenderer) Unbind() error { gl.Viewport(0, 0, int32(r.oldwidth), int32(r.oldheight)) gl.BindFramebuffer(gl.FRAMEBUFFER, 0) gl.Disable(gl.STENCIL_TEST) return nil }
func InitGL() error { defer tlog.FuncLog(tlog.Func("InitGL")) err := gl.Init() if err != nil { return err } gl.GetError() // cleanup gl error state version := gl.GoStr(gl.GetString(gl.VERSION)) tlog.Println("OpenGL version", version) gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL) Check() gl.ReadBuffer(gl.BACK) Check() gl.DrawBuffer(gl.BACK) Check() gl.FrontFace(gl.CW) Check() gl.CullFace(gl.BACK) Check() gl.Disable(gl.CULL_FACE) Check() gl.ClearColor(1, 1, 0.5, 0) Check() gl.ClearDepth(1.0) Check() gl.ClearStencil(0) Check() gl.Disable(gl.STENCIL_TEST) Check() gl.StencilMask(0xFFFFFFFF) Check() gl.StencilFunc(gl.EQUAL, 0x00000000, 0x00000001) Check() gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP) Check() gl.Disable(gl.DITHER) Check() gl.Enable(gl.DEPTH_TEST) Check() gl.DepthFunc(gl.LEQUAL) Check() gl.DepthMask(true) Check() gl.DepthRange(0., 1.) Check() gl.Enable(gl.DEPTH_CLAMP) Check() gl.Enable(gl.BLEND) Check() gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA) ForceCheck() return nil }