// 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 Run() {
if err := glfw.Init(); err != nil {
glog.Fatalln("failed to initialize glfw", err)
}
defer glfw.Terminate()
setupWindowOptions()
window, err := glfw.CreateWindow(WindowWidth, WindowHeight, "Game", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
//initilize Glow
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
shaderSource, err := ReadShaders("colorShader")
if err != nil {
panic(err)
}
program, err := NewProgram(shaderSource)
if err != nil {
panic(err)
}
program.Use()
sprite := &SpriteComponent{-.5, -.5, 1, 1}
sprite.ReloadGraphics()
vertAttrib := uint32(gl.GetAttribLocation(program.program, CStr("vertPosition")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 0, gl.PtrOffset(0))
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
for !window.ShouldClose() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
program.Use()
gl.BindVertexArray(sprite.vaoID)
gl.DrawArrays(gl.TRIANGLES, 0, 2*3)
window.SwapBuffers()
glfw.PollEvents()
}
}
func (p *Program) GetAttribLocation(s string) uint32 {
var s_array []uint8 = StringToArray(s)
return uint32(gl.GetAttribLocation(p.prog, &s_array[0]))
}
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 (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))
}