// New creates a new shader object. The shader can later be activated by the given name with the Use function
func New(name, vertexShaderSource, fragmentShaderSource string) error {
if _, found := shaderList[name]; found {
return fmt.Errorf("Shader already exists: %v", name)
}
program, err := newProgram(vertexShaderSource, fragmentShaderSource)
if err != nil {
return err
}
shader := Shader{}
shader.id = program
shader.loaded = true
shader.vert = vertexShaderSource
shader.frag = fragmentShaderSource
gl.UseProgram(shader.id)
shader.Projection = gl.GetUniformLocation(program, gl.Str("projection\x00"))
shader.Camera = gl.GetUniformLocation(program, gl.Str("camera\x00"))
shader.Model = gl.GetUniformLocation(program, gl.Str("model\x00"))
shaderList[name] = shader
if activeShader := GetActive(); activeShader != nil {
activeShader.Activate()
}
return nil
}
func (self *ShaderInfo) CompileShader() (uint32, error) {
content, err := ioutil.ReadFile(self.Path)
if err != nil {
return 0, err
}
contentString := bytes.NewBuffer(content).String()
glContentString := gl.Str(contentString + "\x00")
shader := gl.CreateShader(self.ShaderType)
gl.ShaderSource(shader, 1, &glContentString, nil)
gl.CompileShader(shader)
var status int32
gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetShaderInfoLog(shader, logLength, nil, gl.Str(log))
return 0, fmt.Errorf("failed to compile %v: %v", contentString, log)
}
return shader, nil
}
func newProgram(vertexShaderSource, fragmentShaderSource string) (uint32, error) {
vertexShader, err := compileShader(vertexShaderSource, gl.VERTEX_SHADER)
if err != nil {
return 0, err
}
fragmentShader, err := compileShader(fragmentShaderSource, gl.FRAGMENT_SHADER)
if err != nil {
return 0, err
}
program := gl.CreateProgram()
gl.AttachShader(program, vertexShader)
gl.AttachShader(program, fragmentShader)
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return 0, fmt.Errorf("failed to link program: %v", log)
}
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShader)
return program, nil
}
func LoadShaders(shaders []ShaderInfo) (uint32, error) {
program := gl.CreateProgram()
for _, shaderInfo := range shaders {
shader, err := shaderInfo.CompileShader()
if err != nil {
return 0, err
}
gl.AttachShader(program, shader)
gl.DeleteShader(shader)
}
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return 0, fmt.Errorf("Failed to link program: %v", log)
}
return program, nil
}
func setupUniforms(shader *renderer.Shader) {
for name, uniform := range shader.Uniforms {
uniformLocation := gl.GetUniformLocation(shader.Program, gl.Str(name+"\x00"))
switch t := uniform.(type) {
case bool:
if t {
gl.Uniform1i(uniformLocation, 1)
} else {
gl.Uniform1i(uniformLocation, 0)
}
case float32:
gl.Uniform1f(uniformLocation, t)
case float64:
gl.Uniform1f(uniformLocation, float32(t))
case int32:
gl.Uniform1i(uniformLocation, t)
case int:
gl.Uniform1i(uniformLocation, int32(t))
case mgl32.Vec2:
gl.Uniform2f(uniformLocation, t[0], t[1])
case mgl32.Vec3:
gl.Uniform3f(uniformLocation, t[0], t[1], t[2])
case mgl32.Vec4:
gl.Uniform4f(uniformLocation, t[0], t[1], t[2], t[3])
case mgl32.Mat4:
gl.UniformMatrix4fv(uniformLocation, 1, false, &t[0])
case []float32:
gl.Uniform4fv(uniformLocation, (int32)(len(t)), &t[0])
case []int32:
gl.Uniform4iv(uniformLocation, (int32)(len(t)), &t[0])
default:
fmt.Printf("unexpected type for shader uniform: %T\n", t)
}
}
}
func newProgram(shaders ...uint32) (uint32, error) {
program := gl.CreateProgram()
for _, shader := range shaders {
gl.AttachShader(program, shader)
}
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return 0, errors.New(fmt.Sprintf("failed to link program: %v", log))
}
for _, shader := range shaders {
gl.DeleteShader(shader)
}
return program, nil
}
func compileShader(shaderCode string, shaderType uint32) uint32 {
shader := gl.CreateShader(shaderType)
shaderChars := gl.Str(shaderCode + "\x00")
gl.ShaderSource(shader, 1, &shaderChars, nil)
gl.CompileShader(shader)
checkShaderCompileErrors(shader)
return shader
}
func (c *Camera) Draw(program uint32) {
//c.UpdateCamera()
camera := mgl32.LookAtV(c.position, c.position.Add(c.direction), c.up)
cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])
}
func compileShaders() []uint32 {
// create the vertex shader
vertexShader := gl.CreateShader(gl.VERTEX_SHADER)
shaderSourceChars := gl.Str(vertexShaderSource + "\x00")
gl.ShaderSource(vertexShader, 1, &shaderSourceChars, nil)
gl.CompileShader(vertexShader)
checkShaderCompileErrors(vertexShader)
// create the fragment shader
fragmentShader := gl.CreateShader(gl.FRAGMENT_SHADER)
shaderSourceChars = gl.Str(fragmentShaderSource + "\x00")
gl.ShaderSource(fragmentShader, 1, &shaderSourceChars, nil)
gl.CompileShader(fragmentShader)
checkShaderCompileErrors(fragmentShader)
return []uint32{vertexShader, fragmentShader}
}
// Load loads and sets up the model
func (m *Model) Load(fileName string) {
m.loadFile(fileName)
shader := sm.Shader{VertSrcFile: m.data.VertShaderFile, FragSrcFile: m.data.FragShaderFile, Name: fmt.Sprintf("%s:%s", m.data.VertShaderFile, m.data.FragShaderFile)}
program, err := m.shaders.LoadProgram(shader, false)
if err != nil {
return
}
m.currentProgram = program
gl.UseProgram(m.currentProgram)
m.projection = mgl32.Perspective(mgl32.DegToRad(45.0), float32(windowWidth)/windowHeight, 0.1, 10.0)
m.projectionUniform = gl.GetUniformLocation(m.currentProgram, gl.Str("projection\x00"))
gl.UniformMatrix4fv(m.projectionUniform, 1, false, &m.projection[0])
m.camera = mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
m.cameraUniform = gl.GetUniformLocation(m.currentProgram, gl.Str("camera\x00"))
gl.UniformMatrix4fv(m.cameraUniform, 1, false, &m.camera[0])
m.modelUniform = gl.GetUniformLocation(m.currentProgram, gl.Str("model\x00"))
gl.UniformMatrix4fv(m.modelUniform, 1, false, &m.model[0])
m.textureUniform = gl.GetUniformLocation(m.currentProgram, gl.Str("tex\x00"))
gl.Uniform1i(m.textureUniform, 0)
gl.BindFragDataLocation(m.currentProgram, 0, gl.Str("outputColor\x00"))
// Load the texture
m.textures.LoadTexture(m.data.TextureFile, m.data.TextureFile)
// Configure the vertex data
gl.GenVertexArrays(1, &m.vao)
gl.BindVertexArray(m.vao)
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(m.data.Verts)*4, gl.Ptr(m.data.Verts), gl.STATIC_DRAW)
vertAttrib := uint32(gl.GetAttribLocation(m.currentProgram, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, m.data.VertSize*4, gl.PtrOffset(0)) // 4:number of bytes in a float32
texCoordAttrib := uint32(gl.GetAttribLocation(m.currentProgram, gl.Str("vertTexCoord\x00")))
gl.EnableVertexAttribArray(texCoordAttrib)
gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, true, m.data.VertSize*4, gl.PtrOffset(3*4)) // 4:number of bytes in a float32
if m.data.Indexed {
var indices uint32
gl.GenBuffers(1, &indices)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, indices)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(m.data.Indices)*4, gl.Ptr(m.data.Indices), gl.STATIC_DRAW)
}
gl.BindVertexArray(0)
}
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 createProgram() uint32 {
vs := gl.CreateShader(gl.VERTEX_SHADER)
cvertexShader := gl.Str(vertexShader)
gl.ShaderSource(vs, 1, &cvertexShader, nil)
gl.CompileShader(vs)
fs := gl.CreateShader(gl.FRAGMENT_SHADER)
cfragmentShader := gl.Str(fragmentShader)
gl.ShaderSource(fs, 1, &cfragmentShader, nil)
gl.CompileShader(fs)
shaderProgram := gl.CreateProgram()
gl.AttachShader(shaderProgram, fs)
gl.AttachShader(shaderProgram, vs)
gl.LinkProgram(shaderProgram)
return shaderProgram
}
func (me *Core) AddProgram(vertFile, fragFile string) int {
vertexShader := gl.Str(readWholeFile(vertFile) + "\x00")
fragmentShader := gl.Str(readWholeFile(fragFile) + "\x00")
n := me.nbProg
vs := gl.CreateShader(gl.VERTEX_SHADER)
gl.ShaderSource(vs, 1, &vertexShader, nil)
gl.CompileShader(vs)
fs := gl.CreateShader(gl.FRAGMENT_SHADER)
gl.ShaderSource(fs, 1, &fragmentShader, nil)
gl.CompileShader(fs)
me.Progs[n] = gl.CreateProgram()
gl.AttachShader(me.Progs[n], fs)
gl.AttachShader(me.Progs[n], vs)
gl.LinkProgram(me.Progs[n])
me.nbProg++
return n
}
// Activate will draw everything with this program and load it if it isnt loaded.
func (shader *Shader) Activate() {
if !shader.loaded {
program, err := newProgram(shader.vert, shader.frag)
if err != nil {
panic(err)
}
shader.id = program
shader.loaded = true
gl.UseProgram(shader.id)
shader.Projection = gl.GetUniformLocation(program, gl.Str("projection\x00"))
shader.Camera = gl.GetUniformLocation(program, gl.Str("camera\x00"))
shader.Model = gl.GetUniformLocation(program, gl.Str("model\x00"))
}
state.shader = shader
gl.UseProgram(shader.id)
}
func compileShader(source string, shaderType uint32) (uint32, error) {
shader := gl.CreateShader(shaderType)
csource := gl.Str(source)
gl.ShaderSource(shader, 1, &csource, nil)
gl.CompileShader(shader)
var status int32
gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetShaderInfoLog(shader, logLength, nil, gl.Str(log))
return 0, fmt.Errorf("failed to compile %v: %v", source, log)
}
return shader, nil
}
func NewProgram(shaderSource map[string]string) (*GLSLProgram, error) {
var hasVertexShader bool
var hasFragmentShader bool
vertexShaderSource, ok := shaderSource["vertex"]
var vertexShader uint32
if ok {
vertexShader, err := compileShader(vertexShaderSource, gl.VERTEX_SHADER)
if err != nil {
return nil, err
}
hasVertexShader = true
}
fragmentShaderSource, ok := shaderSource["fragment"]
var fragmentShader uint32
if ok {
fragmentShader, err := compileShader(fragmentShaderSource, gl.FRAGMENT_SHADER)
if err != nil {
return nil, err
}
hasFragmentShader = true
}
program := gl.CreateProgram()
if !(hasVertexShader && hasFragmentShader) {
return nil, fmt.Errorf("Need vertex shader: %v, and fragment shader: %v", hasVertexShader, hasFragmentShader)
}
gl.AttachShader(program, vertexShader)
gl.AttachShader(program, fragmentShader)
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return nil, fmt.Errorf("Failed to link program(%v): %v", program, log)
}
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShader)
p := &GLSLProgram{program, vertexShaderSource, fragmentShaderSource, true}
return p, nil
}
func NewShader(src string, sType uint32) (*Shader, error) {
handle := gl.CreateShader(sType)
glSrc := gl.Str(src + "\x00")
gl.ShaderSource(handle, 1, &glSrc, nil)
gl.CompileShader(handle)
err := getGlError(handle, gl.COMPILE_STATUS, gl.GetShaderiv, gl.GetShaderInfoLog,
"SHADER::COMPILE_FAILURE::")
if err != nil {
return nil, err
}
return &Shader{handle: handle}, nil
}
func getGlError(glHandle uint32, checkTrueParam uint32, getObjIvFn getObjIv,
getObjInfoLogFn getObjInfoLog, failMsg string) error {
var success int32
getObjIvFn(glHandle, checkTrueParam, &success)
if success == gl.FALSE {
var logLength int32
getObjIvFn(glHandle, gl.INFO_LOG_LENGTH, &logLength)
log := gl.Str(strings.Repeat("\x00", int(logLength)))
getObjInfoLogFn(glHandle, logLength, nil, log)
return fmt.Errorf("%s: %s", failMsg, gl.GoStr(log))
}
return nil
}
func newProgram(vertexShaderFilename, fragmentShaderFilename string) (uint32, error) {
program := gl.CreateProgram()
//vertexShaderSource, err := shaders.Asset(vertexShaderFilename)
//if err != nil {
// return 0, err
//}
vertexShader, err := shaders.Compile(vertexShaderSource, gl.VERTEX_SHADER)
if err != nil {
return 0, err
}
//fragmentShaderSource, err := shaders.Asset(fragmentShaderFilename)
//if err != nil {
// return 0, err
//}
fragmentShader, err := shaders.Compile(fragmentShaderSource, gl.FRAGMENT_SHADER)
if err != nil {
return 0, err
}
gl.AttachShader(program, vertexShader)
gl.AttachShader(program, fragmentShader)
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status == gl.FALSE {
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := strings.Repeat("\x00", int(logLength+1))
gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
return 0, errors.New(fmt.Sprintf("failed to link program: %v", log))
}
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShader)
return program, nil
}
func (glRenderer *OpenglRenderer) CreateShader(shader *renderer.Shader) {
if shader.Loaded {
return
}
var shaders []uint32
if len(shader.VertSrc) > 0 {
if s, err := compileShader(shader.VertSrc+"\x00", gl.VERTEX_SHADER); err == nil {
shaders = append(shaders, s)
} else {
fmt.Println("Error Compiling Vert Shader: ", err)
}
}
if len(shader.FragSrc) > 0 {
if s, err := compileShader(shader.FragSrc+"\x00", gl.FRAGMENT_SHADER); err == nil {
shaders = append(shaders, s)
} else {
fmt.Println("Error Compiling Frag Shader: ", err)
}
}
if len(shader.GeoSrc) > 0 {
if s, err := compileShader(shader.GeoSrc+"\x00", gl.GEOMETRY_SHADER); err == nil {
shaders = append(shaders, s)
} else {
fmt.Println("Error Compiling Geo Shader: ", err)
}
}
program, err := newProgram(shaders...)
if err != nil {
fmt.Println("Error Creating Shader Program: ", err)
}
shader.Program = program
shader.Loaded = true
gl.UseProgram(program)
gl.BindFragDataLocation(program, 0, gl.Str(fmt.Sprintf("%v\x00", shader.FragDataLocation)))
}
func main() {
if err := glfw.Init(); err != nil {
log.Fatalln("failed to initialize glfw:", err)
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(windowWidth, windowHeight, "Cube", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// Initialize Glow
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
// Configure the vertex and fragment shaders
program, err := newProgram(vertexShader, fragmentShader)
if err != nil {
panic(err)
}
gl.UseProgram(program)
projection := mgl32.Perspective(mgl32.DegToRad(45.0), float32(windowWidth)/windowHeight, 0.1, 10.0)
projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])
camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])
model := mgl32.Ident4()
modelUniform := gl.GetUniformLocation(program, gl.Str("model\x00"))
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
textureUniform := gl.GetUniformLocation(program, gl.Str("tex\x00"))
gl.Uniform1i(textureUniform, 0)
gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))
// Load the texture
texture, err := newTexture("square.png")
if err != nil {
panic(err)
}
// Configure the vertex data
var vao uint32
gl.GenVertexArrays(1, &vao)
gl.BindVertexArray(vao)
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(cubeVertices)*4, gl.Ptr(cubeVertices), gl.STATIC_DRAW)
vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
texCoordAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vertTexCoord\x00")))
gl.EnableVertexAttribArray(texCoordAttrib)
gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))
// Configure global settings
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
angle := 0.0
previousTime := glfw.GetTime()
for !window.ShouldClose() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
// Update
time := glfw.GetTime()
elapsed := time - previousTime
previousTime = time
angle += elapsed
model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})
// Render
gl.UseProgram(program)
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
gl.BindVertexArray(vao)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.DrawArrays(gl.TRIANGLES, 0, 6*2*3)
// Maintenance
window.SwapBuffers()
glfw.PollEvents()
}
}
func CStr(str string) *uint8 {
if !strings.HasSuffix(str, "\x00") {
str = str + "\x00"
}
return gl.Str(str)
}
func (glRenderer *OpenglRenderer) DrawGeometry(geometry *renderer.Geometry, transform mgl32.Mat4) {
glRenderer.enableShader()
glRenderer.enableMaterial()
glRenderer.enableCubeMap()
if glRenderer.activeShader == nil {
panic("ERROR: No shader is configured.")
}
shader := glRenderer.activeShader
program := shader.Program
params := glRenderer.rendererParams
glRenderer.enableDepthTest(params.DepthTest)
glRenderer.enableDepthMask(params.DepthMask)
glRenderer.enableCullFace(params.CullBackface)
glRenderer.enableUnlit(params.Unlit)
glRenderer.setTransparency(params.Transparency)
// set buffers
gl.BindBuffer(gl.ARRAY_BUFFER, geometry.VboId)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, geometry.IboId)
// update buffers
if geometry.VboDirty && len(geometry.Verticies) > 0 && len(geometry.Indicies) > 0 {
gl.BufferData(gl.ARRAY_BUFFER, len(geometry.Verticies)*4, gl.Ptr(geometry.Verticies), gl.DYNAMIC_DRAW)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(geometry.Indicies)*4, gl.Ptr(geometry.Indicies), gl.DYNAMIC_DRAW)
geometry.VboDirty = false
}
// set uniforms
modelNormal := transform.Inv().Transpose()
shader.Uniforms["model"] = transform
shader.Uniforms["modelNormal"] = modelNormal
// set camera uniforms
cam := glRenderer.camera
win := glRenderer.WindowDimensions()
shader.Uniforms["cameraTranslation"] = cam.Translation
if cam.Ortho {
shader.Uniforms["projection"] = mgl32.Ortho2D(0, win.X(), win.Y(), 0)
shader.Uniforms["camera"] = mgl32.Ident4()
} else {
shader.Uniforms["projection"] = mgl32.Perspective(mgl32.DegToRad(cam.Angle), win.X()/win.Y(), cam.Near, cam.Far)
shader.Uniforms["camera"] = mgl32.LookAtV(cam.Translation, cam.Lookat, cam.Up)
}
shader.Uniforms["unlit"] = glRenderer.unlit
shader.Uniforms["useTextures"] = glRenderer.useTextures
shader.Uniforms["ambientLightValue"] = glRenderer.ambientLightValue
shader.Uniforms["nbPointLights"] = glRenderer.nbPointLights
shader.Uniforms["pointLightValues"] = glRenderer.pointLightValues
shader.Uniforms["pointLightPositions"] = glRenderer.pointLightPositions
shader.Uniforms["nbDirectionalLights"] = glRenderer.nbDirectionalLights
shader.Uniforms["directionalLightValues"] = glRenderer.directionalLightValues
shader.Uniforms["directionalLightVectors"] = glRenderer.directionalLightVectors
// set custom uniforms
setupUniforms(shader)
// set verticies attribute
vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, renderer.VertexStride*4, gl.PtrOffset(0))
// set normals attribute
normAttrib := uint32(gl.GetAttribLocation(program, gl.Str("normal\x00")))
gl.EnableVertexAttribArray(normAttrib)
gl.VertexAttribPointer(normAttrib, 3, gl.FLOAT, false, renderer.VertexStride*4, gl.PtrOffset(3*4))
// set texture coord attribute
texCoordAttrib := uint32(gl.GetAttribLocation(program, gl.Str("texCoord\x00")))
gl.EnableVertexAttribArray(texCoordAttrib)
gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, renderer.VertexStride*4, gl.PtrOffset(6*4))
// vertex color attribute
colorAttrib := uint32(gl.GetAttribLocation(program, gl.Str("color\x00")))
gl.EnableVertexAttribArray(colorAttrib)
gl.VertexAttribPointer(colorAttrib, 4, gl.FLOAT, false, renderer.VertexStride*4, gl.PtrOffset(8*4))
gl.DrawElements(gl.TRIANGLES, (int32)(len(geometry.Indicies)), gl.UNSIGNED_INT, gl.PtrOffset(0))
}
func (prog *Program) GetUniformLocation(name string) int32 {
return gl.GetUniformLocation(prog.handle, gl.Str(name+"\x00"))
}
func Main() {
err := glfw.Init()
if err != nil {
panic(err)
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 2)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(WindowWidth, WindowHeight, "Cube", nil, nil)
Window = window
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// Initialize Glow
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
// Configure the vertex and fragment shaders
program, err := newProgram("SimpleVertexShader.vertexshader", "SimpleFragmentShader.fragmentshader")
if err != nil {
panic(err)
}
gl.UseProgram(program)
projection := mgl32.Perspective(mgl32.DegToRad(45.0), float32(WindowWidth)/WindowHeight, 0.1, 10.0)
projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])
camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])
model := mgl32.Ident4()
modelUniform := gl.GetUniformLocation(program, gl.Str("model\x00"))
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
textureUniform := gl.GetUniformLocation(program, gl.Str("tex\x00"))
gl.Uniform1i(textureUniform, 0)
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 := 0.0
previousTime := glfw.GetTime()
width, height := window.GetSize()
window.SetCursorPos(float64(width/2), float64(height/2))
window.SetKeyCallback(input.OnKey)
window.SetCursorPosCallback(input.OnCursor)
window.SetMouseButtonCallback(input.OnMouse)
meshes.LoadColladaCube("cube.dae")
for !player.ShouldClose {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
// Update
time := glfw.GetTime()
elapsed := time - previousTime
previousTime = time
angle += elapsed
model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})
// Render
gl.UseProgram(program)
// gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
player.MainPlayer.Draw(program)
for _, element := range game.Universe {
(element).Draw(program)
}
// Maintenance
window.SwapBuffers()
glfw.PollEvents()
}
}
