func (glRenderer *OpenglRenderer) renderPostEffect(pe postEffect) {
gl.UseProgram(pe.program)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, pe.textureId)
gl.Disable(gl.CULL_FACE)
gl.BindBuffer(gl.ARRAY_BUFFER, glRenderer.postEffectVbo)
setupUniforms(pe.shader)
vertAttrib := uint32(gl.GetAttribLocation(pe.program, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 2, gl.FLOAT, false, 4*4, gl.PtrOffset(0))
texCoordAttrib := uint32(gl.GetAttribLocation(pe.program, gl.Str("vertTexCoord\x00")))
gl.EnableVertexAttribArray(texCoordAttrib)
gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, 4*4, gl.PtrOffset(2*4))
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.DisableVertexAttribArray(texCoordAttrib)
}
func (renderer *Renderer) Loop() {
defer glog.Flush()
if err := glfw.Init(); err != nil {
glog.Fatalln("GLFW failed to initialize:", err)
glog.Info("GLFW failed to init")
}
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 2)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
glfw.WindowHint(glfw.Resizable, glfw.False)
window, windowError := glfw.CreateWindow(800, 600, "OpenGL", nil, nil)
if windowError != nil {
glog.Info("oops")
panic(windowError)
}
glog.Info("Buffer")
defer func() {
window.Destroy()
glfw.Terminate()
glog.Info("ending")
renderer.ended = true
//system_end <- true
}()
window.MakeContextCurrent()
if err := gl.Init(); err != nil {
panic(err)
}
renderer.keyCallback = func(window *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
glog.Infof("key: %v, scancode: %v, action: %v, mods: %v", key, scancode, action, mods)
}
window.SetKeyCallback(renderer.keyCallback)
//<-system_start
renderer.started = true
//system_started <- true
gl.ClearDepth(1.0)
var vboID uint32
gl.GenBuffers(1, &vboID)
var vertexData = []float32{
1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1,
}
gl.BindBuffer(gl.ARRAY_BUFFER, vboID)
gl.BufferData(gl.ARRAY_BUFFER, len(vertexData)*4, gl.Ptr(vertexData), gl.STATIC_DRAW)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
//get shaders
vertexShader, fragmentShader := getShaders()
program, err := newProgram(vertexShader, fragmentShader)
program.UseProgram()
if err != nil {
panic(err)
}
//bind attributes
// L:
for !window.ShouldClose() {
//renderer.drawGame(program)
gl.EnableVertexAttribArray(0)
gl.BindBuffer(gl.ARRAY_BUFFER, vboID)
gl.VertexAttribPointer(
0,
3,
gl.FLOAT,
false,
0,
gl.PtrOffset(0))
gl.DrawArrays(gl.TRIANGLES, 0, 3)
gl.DisableVertexAttribArray(0)
window.SwapBuffers()
glfw.PollEvents()
}
if vboID != 0 {
gl.DeleteBuffers(1, &vboID)
}
}
func (program *GLSLProgram) UnUse() {
gl.UseProgram(0)
for i := uint32(0); i < program.numAttributes; i++ {
gl.DisableVertexAttribArray(i)
}
}
func (v *VBO) Unbind() {
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0)
gl.DisableVertexAttribArray(gPosition_attr)
gl.DisableVertexAttribArray(gUVs_attr)
gl.BindVertexArray(0)
}
