func (t *Texture) ReadTextureFromGPU() []byte {
t.Bind()
b := gl.GenBuffer()
b.Bind(gl.PIXEL_UNPACK_BUFFER)
gl.BufferData(gl.PIXEL_UNPACK_BUFFER, t.Width()*t.Height()*t.PixelSize(), 0, gl.STREAM_DRAW)
//gl.GetTexImage(t.target, 0, t.format, buffer)
b.Bind(gl.PIXEL_UNPACK_BUFFER)
gl.TexSubImage2D(t.target, 0, 0, 0, t.Width(), t.Height(), t.format, t.typ, unsafe.Pointer(uintptr(0)))
b.Bind(gl.PIXEL_UNPACK_BUFFER)
l := t.Width() * t.Height() * t.PixelSize()
gl.BufferData(gl.PIXEL_UNPACK_BUFFER, t.Width()*t.Height()*t.PixelSize(), 0, gl.STREAM_DRAW)
ptr := gl.MapBuffer(gl.PIXEL_UNPACK_BUFFER, gl.WRITE_ONLY)
var x []byte
s := (*reflect.SliceHeader)(unsafe.Pointer(&x))
s.Data = uintptr(ptr)
s.Len = l
s.Cap = l
gl.UnmapBuffer(gl.PIXEL_UNPACK_BUFFER)
return x
}
func (v *Video) initGL() {
if gl.Init() != 0 {
panic(sdl.GetError())
}
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Enable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
v.prog = createProgram(vertShaderSrcDef, fragShaderSrcDef)
posAttrib := v.prog.GetAttribLocation("vPosition")
texCoordAttr := v.prog.GetAttribLocation("vTexCoord")
v.textureUni = v.prog.GetAttribLocation("texture")
v.texture = gl.GenTexture()
gl.ActiveTexture(gl.TEXTURE0)
v.texture.Bind(gl.TEXTURE_2D)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
v.prog.Use()
posAttrib.EnableArray()
texCoordAttr.EnableArray()
vertVBO := gl.GenBuffer()
vertVBO.Bind(gl.ARRAY_BUFFER)
verts := []float32{-1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(verts)*int(unsafe.Sizeof(verts[0])), &verts[0], gl.STATIC_DRAW)
textCoorBuf := gl.GenBuffer()
textCoorBuf.Bind(gl.ARRAY_BUFFER)
texVerts := []float32{0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(texVerts)*int(unsafe.Sizeof(texVerts[0])), &texVerts[0], gl.STATIC_DRAW)
posAttrib.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
texCoordAttr.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
}
func NewLineRenderer() *LineRenderer {
renderer := LineRenderer{}
renderer.Prog = helpers.MakeProgram("Line.vs", "Line.fs")
renderer.Prog.Use()
renderer.vao = gl.GenVertexArray()
renderer.vao.Bind()
helpers.BindLocations("line", renderer.Prog, &renderer.RenLoc)
renderer.buffer = gl.GenBuffer()
renderer.buffer.Bind(gl.ARRAY_BUFFER)
helpers.SetAttribPointers(&renderer.RenLoc, &debug.LineVertex{}, false)
fmt.Println("Line render location ", renderer.RenLoc)
return &renderer
}
func CreateShapeDataBuffer() gl.Buffer {
fmt.Println("CreateShapeDataBuffer:")
particleShape := []ParticleShapeVertex{
{mgl.Vec4{-R, -R, 0, 1}, mgl.Vec2{0, 1}},
{mgl.Vec4{R, -R, 0, 1}, mgl.Vec2{1, 1}},
{mgl.Vec4{R, R, 0, 1}, mgl.Vec2{1, 0}},
{mgl.Vec4{-R, R, 0, 1}, mgl.Vec2{0, 0}},
}
particleShapeBuffer := gl.GenBuffer()
particleShapeBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, helpers.ByteSizeOfSlice(particleShape), particleShape, gl.STATIC_DRAW)
return particleShapeBuffer
}
func (drawer *SpriteDrawer) Draw(sprites []Sprite) {
gl.Viewport(0, 0, drawer.width, drawer.height)
if len(sprites) == 0 {
return
}
drawer.Use()
drawer.Texture.Bind(gl.TEXTURE_2D_ARRAY)
tmp := drawer.GetTransform().To32()
drawer.camera_uniform.UniformMatrix2x3f(false, &tmp)
vertexbuffer := gl.GenBuffer()
defer vertexbuffer.Delete()
vertexbuffer.Bind(gl.ARRAY_BUFFER)
stride := int(unsafe.Sizeof(sprites[0]))
gl.BufferData(gl.ARRAY_BUFFER, stride*len(sprites), sprites, gl.STREAM_DRAW)
var transform1, transform2, texcoords, texlevel gl.AttribLocation
transform1 = 0
transform2 = 1
texcoords = 2
texlevel = 3
transform1.AttribPointer(3, gl.FLOAT, false, stride, unsafe.Offsetof(sprites[0].Transform))
transform2.AttribPointer(3, gl.FLOAT, false, stride, unsafe.Offsetof(sprites[0].Transform)+unsafe.Sizeof(sprites[0].Transform[0])*3)
texcoords.AttribPointer(4, gl.FLOAT, false, stride, unsafe.Offsetof(sprites[0].TextureLeft))
texlevel.AttribPointer(1, gl.FLOAT, false, stride, unsafe.Offsetof(sprites[0].Layer))
transform1.EnableArray()
transform2.EnableArray()
texcoords.EnableArray()
texlevel.EnableArray()
gl.DrawArrays(gl.POINTS, 0, len(sprites))
transform1.DisableArray()
transform2.DisableArray()
texcoords.DisableArray()
texlevel.DisableArray()
}
func main() {
glfw.SetErrorCallback(errorCallback)
// lock glfw/gl calls to a single thread
runtime.LockOSThread()
runtime.GOMAXPROCS(8) // Render, read commands, send input, extra for file loading, etc
if !glfw.Init() {
panic("Could not init glfw!")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
window, err := glfw.CreateWindow(800, 600, "Example", nil, nil)
if err != nil {
panic(err)
}
window.SetFramebufferSizeCallback(func(w *glfw.Window, width, height int) {
fmt.Printf("Framebuffer size is now %vx%v\n", width, height)
// Keep aspect ratio from camwidth/camheight
camRatio := camWidth / camHeight
bufRatio := float32(width) / float32(height)
var newWidth, newHeight float32
switch {
case camRatio > bufRatio:
newHeight = float32(width) / camRatio
newWidth = float32(width)
case bufRatio > camRatio:
newWidth = float32(height) * camRatio
newHeight = float32(height)
}
fmt.Printf("Viewport size is now %vx%v; cam ratio is %v; viewport ratio is %v;\n", newWidth, newHeight, camRatio, newWidth/newHeight)
gl.Viewport((width-int(newWidth))/2, (height-int(newHeight))/2, int(newWidth), int(newHeight))
})
defer window.Destroy()
window.MakeContextCurrent()
glfw.SwapInterval(1)
gl.Init()
// Enable blending
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
vao := gl.GenVertexArray()
vao.Bind()
vbo := gl.GenBuffer()
vbo.Bind(gl.ARRAY_BUFFER)
verticies := []float32{-0.5, 0.5,
0.5, 0.5,
0.5, -0.5,
-0.5, -0.5}
gl.BufferData(gl.ARRAY_BUFFER, len(verticies)*4, verticies, gl.STATIC_DRAW)
vertex_shader := gl.CreateShader(gl.VERTEX_SHADER)
vertex_shader.Source(vertex)
vertex_shader.Compile()
fmt.Println(vertex_shader.GetInfoLog())
defer vertex_shader.Delete()
fragment_shader := gl.CreateShader(gl.FRAGMENT_SHADER)
fragment_shader.Source(fragment)
fragment_shader.Compile()
fmt.Println(fragment_shader.GetInfoLog())
defer fragment_shader.Delete()
program := gl.CreateProgram()
program.AttachShader(vertex_shader)
program.AttachShader(fragment_shader)
program.BindFragDataLocation(0, "outColor")
program.Link()
program.Use()
defer program.Delete()
positionAttrib := program.GetAttribLocation("position")
positionAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil)
positionAttrib.EnableArray()
defer positionAttrib.DisableArray()
modelMat := program.GetUniformLocation("modelView")
projMat := program.GetUniformLocation("projection")
spriteSize := program.GetUniformLocation("size")
cmd := exec.Command(os.Args[1], os.Args[2:]...)
stdoutReader, stdoutWriter := io.Pipe()
cmd.Stdout = stdoutWriter
input := bufio.NewReader(stdoutReader)
stdinReader, stdinWriter := io.Pipe()
cmd.Stdin = stdinReader
stderr, err := cmd.StderrPipe()
chkErr(err)
go io.Copy(os.Stderr, stderr)
err = cmd.Start()
chkErr(err)
window.SetKeyCallback(handleKey)
go func() {
runtime.LockOSThread()
for !window.ShouldClose() {
sendInput(stdinWriter)
//fmt.Fprintf(stdinWriter, "T %v\n", time.Now())
<-ticks
readCommands(input)
}
}()
frameCnt := 0
queueDepth := 0
then := time.Now()
for !window.ShouldClose() {
frameCnt++
queueDepth += len(commandBus)
if frameCnt%120 == 0 {
fmt.Printf("Queue depth: %v. Render time: %v. Decode time: %v.\n", queueDepth/120, time.Since(then)/120, decodeTime/time.Duration(decodes))
queueDepth = 0
then = time.Now()
decodeTime = time.Duration(0)
decodes = 0
}
for len(commandBus) > 0 {
(<-commandBus)()
}
halfwidth := camWidth / 2.0
halfheight := camHeight / 2.0
projection := mathgl.Ortho2D(camera.x-halfwidth, camera.x+halfwidth, camera.y+halfheight, camera.y-halfheight)
projection = mathgl.Scale3D(camera.sx, camera.sy, 1).Mul4(projection)
projection = mathgl.HomogRotate3DZ(camera.rot).Mul4(projection)
projMat.UniformMatrix4f(false, (*[16]float32)(&projection))
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
for _, sprite := range sprites {
sMat := mathgl.Scale3D(sprite.sx, sprite.sy, 1)
sMat = mathgl.HomogRotate3DZ(sprite.rot).Mul4(sMat)
sMat = mathgl.Translate3D(sprite.x, sprite.y, sprite.z).Mul4(sMat)
// temp hack bank in
sprite.bank = 1
sMap := findSMap(sprite.smap)
spriteSize.Uniform2f(float32(sMap.getWidth()*sprite.cellwidth), float32(sMap.getHeight()*sprite.cellheight))
modelMat.UniformMatrix4f(false, (*[16]float32)(&sMat))
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
}
window.SwapBuffers()
glfw.PollEvents()
if window.GetKey(glfw.KeyEscape) == glfw.Press {
window.SetShouldClose(true)
}
}
}
func GenBuffer() VBO {
return VBO(gl.GenBuffer())
}
func NewParticleSystem(w *gamestate.World, numParticles int, Origin mgl.Vec3, initialSpeed, MaxLifetime float32) *ParticleSystem {
vertices := make([]ParticleVertex, numParticles)
directions := make([]NonTransformBuffer, numParticles)
for i := range vertices {
dir := mgl.Vec3{rand.Float32()*2 - 1, rand.Float32()*2 - 1, rand.Float32()*2 - 1}
for dir.Len() > 1 {
dir = mgl.Vec3{rand.Float32()*2 - 1, rand.Float32()*2 - 1, rand.Float32()*2 - 1}
}
dir = dir.Mul(initialSpeed)
vertices[i] = ParticleVertex{
Pos1: Origin,
Pos2: Origin.Sub(dir),
Lifetime: rand.Float32() * MaxLifetime,
}
directions[i] = NonTransformBuffer{dir}
}
buffer1, buffer2, nonTransformBuffer := gl.GenBuffer(), gl.GenBuffer(), gl.GenBuffer()
nonTransformBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, helpers.ByteSizeOfSlice(directions), directions, gl.STATIC_DRAW)
buffer1.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, helpers.ByteSizeOfSlice(vertices), vertices, gl.STREAM_DRAW)
buffer2.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, helpers.ByteSizeOfSlice(vertices), uintptr(0), gl.STREAM_DRAW)
shapeData := CreateShapeDataBuffer()
TransformProg := gl.CreateProgram()
shader := helpers.MakeShader(gl.VERTEX_SHADER, "ParticleTFF.vs")
TransformProg.AttachShader(shader)
TransformProg.TransformFeedbackVaryings([]string{"v_Pos1", "v_Pos2", "v_Lifetime"}, gl.INTERLEAVED_ATTRIBS)
TransformProg.Link()
shader.Delete()
TransformProg.Use()
TransformLoc := ProgramLocations{}
helpers.BindLocations("particle transform", TransformProg, &TransformLoc)
renderProgram := helpers.MakeProgram("Particle.vs", "Particle.fs")
renderProgram.Use()
RenderLoc := RenderProgramLocations{}
helpers.BindLocations("particle render", renderProgram, &RenderLoc)
vaoTff1 := gl.GenVertexArray()
vaoTff2 := gl.GenVertexArray()
vaoRender1 := gl.GenVertexArray()
vaoRender2 := gl.GenVertexArray()
ps := ParticleSystem{
TransformProg: TransformProg,
TransformLoc: TransformLoc,
RenderProg: renderProgram,
RenderLoc: RenderLoc,
VaoTff1: vaoTff1,
VaoTff2: vaoTff2,
VaoRender1: vaoRender1,
VaoRender2: vaoRender2,
Data1: buffer1,
Data2: buffer2,
ShapeData: shapeData,
NonTransformBuffer: nonTransformBuffer,
NumParticles: numParticles,
Origin: Origin,
Gravity: -9.81 / 200,
InitialSpeed: initialSpeed,
MaxLifetime: MaxLifetime,
}
min_h, max_h := w.HeightMap.Bounds()
W := float32(w.HeightMap.W)
H := float32(w.HeightMap.H)
TransformProg.Use()
ps.SetUniforms()
ps.SetVaos()
TransformProg.Use()
ps.TransformLoc.HeightMap.Uniform1i(constants.TextureHeightMap)
ps.TransformLoc.LowerBound.Uniform3f(0, 0, min_h)
ps.TransformLoc.UpperBound.Uniform3f(W, H, max_h)
return &ps
}
func LoadMeshToGpu(mesh *Mesh, renLoc *RenderLocations) (rd RenderData) {
rd.VAO = gl.GenVertexArray()
rd.VAO.Bind()
{
vertices := mesh.Vertices
verticesType := reflect.TypeOf(vertices)
if verticesType.Kind() != reflect.Slice {
panic("Vertices is not a slice")
}
rd.Vertices = gl.GenBuffer()
rd.Vertices.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, helpers.ByteSizeOfSlice(vertices), vertices, gl.STATIC_DRAW)
rd.Numverts = reflect.ValueOf(vertices).Len()
helpers.SetAttribPointers(renLoc, reflect.ValueOf(vertices).Index(0).Addr().Interface(), false)
switch mesh.Mode {
case Points:
rd.Mode = gl.POINTS
case LineStrip:
rd.Mode = gl.LINE_STRIP
case LineLoop:
rd.Mode = gl.LINE_LOOP
case Lines:
rd.Mode = gl.LINES
case TriangleStrip:
rd.Mode = gl.TRIANGLE_STRIP
case TriangleFan:
rd.Mode = gl.TRIANGLE_FAN
case Triangles:
rd.Mode = gl.TRIANGLES
default:
panic("unsupported mode")
}
}
if indices := mesh.Indices; indices != nil {
indicesType := reflect.TypeOf(indices)
if indicesType.Kind() != reflect.Slice {
panic("Indices is not a slice")
}
rd.Indices = gl.GenBuffer()
rd.Indices.Bind(gl.ELEMENT_ARRAY_BUFFER)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, helpers.ByteSizeOfSlice(indices), indices, gl.STATIC_DRAW)
rd.Numverts = reflect.ValueOf(indices).Len()
switch indicesType.Elem().Kind() {
case reflect.Uint8, reflect.Int8:
rd.IndexType = gl.UNSIGNED_BYTE
case reflect.Uint16, reflect.Int16:
rd.IndexType = gl.UNSIGNED_SHORT
case reflect.Uint32, reflect.Int32:
rd.IndexType = gl.UNSIGNED_INT
default:
panic(fmt.Sprint("unsupported index type", indicesType.Elem().Kind()))
}
}
if instanceData := mesh.InstanceData; instanceData != nil {
Type := reflect.TypeOf(instanceData)
if Type.Kind() != reflect.Slice {
panic("InstanceData is not a slice")
}
rd.InstanceData = gl.GenBuffer()
rd.InstanceData.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, helpers.ByteSizeOfSlice(instanceData), instanceData, gl.STATIC_DRAW)
helpers.SetAttribPointers(renLoc, reflect.ValueOf(instanceData).Index(0).Addr().Interface(), true)
rd.NumInstances = reflect.ValueOf(instanceData).Len()
}
return
}