func NewScene(vertShader, fragShader string, texture *gg.Texture) (*Scene, error) {
gg.Enable(gg.DEPTH_TEST)
gg.Enable(gg.CULL_FACE)
gg.DepthFunc(gg.LESS)
gg.Enable(gg.BLEND)
gg.BlendFunc(gg.SRC_ALPHA, gg.ONE_MINUS_SRC_ALPHA)
// Compile the global shader program
vshader, err := gg.CreateShader([]byte(vertShader), gg.VERTEX_SHADER)
if err != nil {
return nil, err
}
fshader, err := gg.CreateShader([]byte(fragShader), gg.FRAGMENT_SHADER)
if err != nil {
return nil, err
}
program := gg.CreateProgram()
gg.AttachShader(program, vshader)
gg.AttachShader(program, fshader)
if err := gg.LinkProgram(program); err != nil {
return nil, err
}
// Set the global projection matrix
gg.UseProgram(program)
proj := mgl.Ortho(0, float32(WindowWidth), float32(WindowHeight), 0, 0, 1)
projUniform, err := gg.GetUniformLocation(program, "proj")
if err != nil {
return nil, err
}
gg.UniformMatrix4fv(projUniform, proj[:])
vertices := []float32{
float32(WindowWidth)/2 - 50, float32(WindowHeight)/2 - 50, 0,
float32(WindowWidth)/2 - 50, float32(WindowHeight)/2 + 50, 0,
float32(WindowWidth)/2 + 50, float32(WindowHeight)/2 + 50, 0,
float32(WindowWidth)/2 + 50, float32(WindowHeight)/2 - 50, 0,
}
// Initialize sprite
sprite, err := NewSprite(vertices, program, texture)
if err != nil {
return nil, err
}
return &Scene{sprite: sprite}, nil
}
func NewTetris(vertShader, fragShader string) (*Tetris, error) {
gg.Enable(gg.BLEND)
gg.BlendFunc(gg.SRC_ALPHA, gg.ONE_MINUS_SRC_ALPHA)
// Compile the global shader program
vshader, err := gg.CreateShader([]byte(vertShader), gg.VERTEX_SHADER)
if err != nil {
return nil, err
}
fshader, err := gg.CreateShader([]byte(fragShader), gg.FRAGMENT_SHADER)
if err != nil {
return nil, err
}
program := gg.CreateProgram()
gg.AttachShader(program, vshader)
gg.AttachShader(program, fshader)
if err := gg.LinkProgram(program); err != nil {
return nil, err
}
// Set the global projection matrix
gg.UseProgram(program)
proj := mgl.Ortho(0, float32(WindowWidth), float32(WindowHeight), 0, 0, 1)
projUniform, err := gg.GetUniformLocation(program, "proj")
if err != nil {
return nil, err
}
gg.UniformMatrix4fv(projUniform, proj[:])
tetris := &Tetris{}
tetris.textures, err = LoadTextures()
if err != nil {
return nil, err
}
tetris.bg = NewSprite(WindowWidth, WindowHeight, program, tetris.textures["bg"])
tetris.board = NewBoard(WidthCells, HeightCells, program, tetris.textures)
tetris.board.x = Padding
tetris.board.y = Padding
rand.Seed(time.Now().Unix())
tetris.board.current = tetris.board.NewRandomPiece()
go func() {
t := time.NewTicker(time.Second)
for range t.C {
tetris.mu.Lock()
if tetris.gameOver {
return
}
tetris.mu.Unlock()
tetris.HandleInput(inputDown)
}
}()
return tetris, nil
}
func newImageTexture(filename string) (*gg.Texture, error) {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
img, err := png.Decode(f)
if err != nil {
return nil, err
}
var buf []byte
for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
r, g, b, a := img.At(x, y).RGBA()
buf = append(buf, byte(r/256))
buf = append(buf, byte(g/256))
buf = append(buf, byte(b/256))
buf = append(buf, byte(a/256))
}
}
tex := gg.CreateTexture()
gg.ActiveTexture(gg.TEXTURE0)
gg.Enable(gg.TEXTURE_2D)
gg.BindTexture(gg.TEXTURE_2D, tex)
gg.TexImage2D(
gg.TEXTURE_2D,
0,
gg.RGBA,
img.Bounds().Dx(),
img.Bounds().Dy(),
0,
gg.RGBA,
gg.UNSIGNED_BYTE,
buf,
)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_WRAP_S, gg.CLAMP_TO_EDGE)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_WRAP_T, gg.CLAMP_TO_EDGE)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_MAG_FILTER, gg.LINEAR)
gg.TexParameteri(gg.TEXTURE_2D, gg.TEXTURE_MIN_FILTER, gg.LINEAR)
return tex, nil
}