func (m Mesh) draw() {
gl.EnableVertexAttribArray(0)
gl.EnableVertexAttribArray(1)
gl.EnableVertexAttribArray(2)
if m.vbo == 0 {
panic("attempt to set array buffer with VBO=0")
}
gl.BindBuffer(gl.ARRAY_BUFFER, m.vbo)
gl.VertexAttribPointer(0, 3, gl.FLOAT, false, VertexSize*4, gl.PtrOffset(0))
gl.VertexAttribPointer(1, 2, gl.FLOAT, false, VertexSize*4, gl.PtrOffset(12))
gl.VertexAttribPointer(2, 3, gl.FLOAT, false, VertexSize*4, gl.PtrOffset(20))
if m.vbo == 0 {
panic("attempt to set element array buffer with VBO=0")
}
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, m.ibo)
if m.size == 0 {
panic("attempt to draw elements with mesh size = 0")
}
gl.DrawElements(gl.TRIANGLES, m.size, gl.UNSIGNED_INT, gl.PtrOffset(0))
gl.DisableVertexAttribArray(0)
gl.DisableVertexAttribArray(1)
gl.DisableVertexAttribArray(2)
}
func (c *Context) VertexAttribPointer(p Program, location string, signed bool, normalize bool, stride int, size int, v int) {
l := GetAttribLocation(c, p, location)
t := gl.SHORT
if !signed {
t = gl.UNSIGNED_SHORT
}
gl.VertexAttribPointer(uint32(l), int32(size), uint32(t), normalize, int32(stride), gl.PtrOffset(v))
}
func (v *Video) initGL() {
if err := gl.Init(); err != nil {
panic(err)
}
gl.Enable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
v.prog = createProgram(vertShaderSrcDef, fragShaderSrcDef)
posAttrib := uint32(gl.GetAttribLocation(v.prog, gl.Str("vPosition"+"\x00")))
texCoordAttr := uint32(gl.GetAttribLocation(v.prog, gl.Str("vTexCoord"+"\x00")))
v.textureUni = gl.GetAttribLocation(v.prog, gl.Str("texture"+"\x00"))
var texture uint32
gl.GenTextures(1, &texture)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.UseProgram(v.prog)
gl.EnableVertexAttribArray(posAttrib)
gl.EnableVertexAttribArray(texCoordAttr)
//posAttrib.EnableArray()
//texCoordAttr.EnableArray()
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
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])), gl.Ptr(verts), gl.STATIC_DRAW)
var textCoorBuf uint32
gl.GenBuffers(1, &textCoorBuf)
gl.BindBuffer(gl.ARRAY_BUFFER, textCoorBuf)
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])), gl.Ptr(texVerts), gl.STATIC_DRAW)
gl.VertexAttribPointer(posAttrib, 2, gl.FLOAT, false, 0, gl.PtrOffset(0))
gl.VertexAttribPointer(texCoordAttr, 2, gl.FLOAT, false, 0, gl.PtrOffset(0))
//posAttrib.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
//texCoordAttr.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
}
func (*backend) VertexAttribPointer(a *gg.Attribute, size int, typ gg.Enum, normalized bool, stride, offset int) {
gl.VertexAttribPointer(
a.Value.(uint32),
int32(size),
uint32(typ),
normalized,
int32(stride),
gl.PtrOffset(offset),
)
}
func (vao *VAO) Enable(elements int, buffer *Buffer, attrib Attrib, opts ...VAOOption) {
opt := vaoOption{
stride: 0,
offset: 0,
normalize: false,
}
for _, o := range opts {
o(&opt)
}
gl.BindVertexArray(vao.id)
defer gl.BindVertexArray(0)
gl.BindBuffer(gl.ARRAY_BUFFER, buffer.id)
defer gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.EnableVertexAttribArray(attrib.Location())
gl.VertexAttribPointer(
attrib.Location(),
int32(elements),
buffer.data.typ,
opt.normalize,
int32(opt.stride*buffer.data.siz),
gl.PtrOffset(opt.offset*buffer.data.siz))
}
func onDisplay(program uint32) {
coords := uint32(attributeCoord2d)
vcolor := uint32(attributeVColor)
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.UseProgram(program)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Uniform1f(uniformFade, curFade)
gl.EnableVertexAttribArray(coords)
gl.EnableVertexAttribArray(vcolor)
gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
gl.VertexAttribPointer(coords, 2, gl.FLOAT, false, 5*floatSize, nil)
gl.VertexAttribPointer(vcolor, 3, gl.FLOAT, false, 5*floatSize, gl.PtrOffset(2*floatSize))
gl.DrawArrays(gl.TRIANGLES, 0, 3)
gl.DisableVertexAttribArray(vcolor)
gl.DisableVertexAttribArray(coords)
}
// DrawElements renders primitives from a bound buffer.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glDrawElements.xhtml
func DrawElements(mode Enum, count int, ty Enum, offset int) {
gl.DrawElements(uint32(mode), int32(count), uint32(ty), gl.PtrOffset(offset))
}
// VertexAttribPointer uses a bound buffer to define vertex attribute data.
//
// Direct use of VertexAttribPointer to load data into OpenGL is not
// supported via the Go bindings. Instead, use BindBuffer with an
// ARRAY_BUFFER and then fill it using BufferData.
//
// The size argument specifies the number of components per attribute,
// between 1-4. The stride argument specifies the byte offset between
// consecutive vertex attributes.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttribPointer.xhtml
func VertexAttribPointer(dst Attrib, size int, ty Enum, normalized bool, stride, offset int) {
gl.VertexAttribPointer(uint32(dst.Value), int32(size), uint32(ty), normalized, int32(stride), gl.PtrOffset(offset))
}
func (c *Context) DrawElements(mode Mode, len int) {
gl.DrawElements(uint32(mode), int32(len), gl.UNSIGNED_SHORT, gl.PtrOffset(0))
}
func (c *Context) DrawElements(mode, count, typ, offset int) {
gl.DrawElements(uint32(mode), int32(count), uint32(typ), gl.PtrOffset(offset))
}
func (c *Context) VertexAttribPointer(index, size, typ int, normal bool, stride int, offset int) {
gl.VertexAttribPointer(uint32(index), int32(size), uint32(typ), normal, int32(stride), gl.PtrOffset(offset))
}
func Run(charset string, charwidth, charheight int, eh EventHandler) {
mousetrans := mouseTranslator{}
keytrans := keyTranslator{}
defer eh.Fin(true)
width := 800
height := 600
// Initialize glfw and create window
err := glfw.Init()
Panic(err)
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.True)
glfw.WindowHint(glfw.ContextVersionMajor, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
window, err := glfw.CreateWindow(width, height, "Roguelike", nil, nil)
defer window.Destroy()
Panic(err)
window.MakeContextCurrent()
// Initialize opengl
err = gl.Init()
Panic(err)
// Create shaders and program
program, err := gli.NewProgram(vertexShaderText, fragmentShaderText)
Panic(err)
defer program.Delete()
// Load and initialize texture
img, err := gli.LoadImage(charset)
Panic(err)
texture, err := gli.NewTexture(img,
gli.TextureFilter(gli.LINEAR, gli.LINEAR),
gli.TextureWrap(gli.CLAMP_TO_EDGE, gli.CLAMP_TO_EDGE))
Panic(err)
defer texture.Delete()
// Create Vertex ArrayObject
vao, err := gli.NewVAO()
Panic(err)
defer vao.Delete()
// Create grid
grid, err := NewGrid(charwidth, charheight, texture.Size().X, texture.Size().Y)
Panic(err)
grid.Resize(width, height)
vCoords, vIndex, vData := grid.Buffers()
// Create grid buffers
posvbo, err := gli.NewBuffer(vCoords)
Panic(err)
defer posvbo.Delete()
idxvbo, err := gli.NewBuffer(vIndex, gli.BufferElementArray())
Panic(err)
defer idxvbo.Delete()
vbo, err := gli.NewBuffer(vData, gli.BufferAccessFrequency(gli.DYNAMIC))
Panic(err)
defer vbo.Delete()
window.SetSizeCallback(func(win *glfw.Window, w, h int) {
//fmt.Printf("resize\n")
width = w
height = h
gl.Viewport(0, 0, int32(width), int32(height))
grid.Resize(width, height)
vCoords, vIndex, vData := grid.Buffers()
posvbo.Upload(vCoords)
idxvbo.Upload(vIndex)
vbo.Upload(vData)
})
window.SetKeyCallback(func(win *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
//fmt.Printf("key=%v code=%d, action=%v, mods=%v\n", key, scancode, action, mods)
e, ok := keytrans.Key(key, action, mods)
if ok {
eh.Key(e)
}
})
window.SetCharCallback(func(win *glfw.Window, key rune) {
eh.Char(key)
//fmt.Printf("char=%d(%c)\n", key, key)
})
window.SetCursorPosCallback(func(win *glfw.Window, x float64, y float64) {
e, ok := mousetrans.Pos(x, y)
if ok {
eh.Mouse(e)
}
})
window.SetMouseButtonCallback(func(win *glfw.Window, button glfw.MouseButton, action glfw.Action, mods glfw.ModifierKey) {
e, ok := mousetrans.Button(button, action, mods)
if ok {
eh.Mouse(e)
}
})
// Set up VAO
vao.Enable(2, posvbo, program.Attrib("position"))
vao.Enable(2, vbo, program.Attrib("texCoord"),
gli.VAOStride(4))
vao.Enable(1, vbo, program.Attrib("foreColor"),
gli.VAOStride(4), gli.VAOOffset(2))
vao.Enable(1, vbo, program.Attrib("backColor"),
gli.VAOStride(4), gli.VAOOffset(3))
// Set uniforms
program.Uniform("tex").SetSampler(1)
program.Uniform("colorData[0]").SetFloat(colorData...)
program.Uniform("runeSize").SetFloat(float32(grid.RuneSize().X), float32(grid.RuneSize().Y))
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
for !window.ShouldClose() && !eh.Fin(false) {
//fmt.Printf("draw\n")
// Render scene
grid.clearData()
eh.Draw(grid)
_, _, vData = grid.Buffers()
vbo.Update(0, vData)
gl.Clear(gl.COLOR_BUFFER_BIT)
// Draw scene
program.Use()
vao.Use()
texture.Use(1)
idxvbo.Use()
gl.DrawElements(gl.TRIANGLES, grid.Vertices(), gl.UNSIGNED_INT, gl.PtrOffset(0))
window.SwapBuffers()
glfw.WaitEvents()
}
}
func (c *Context) DrawElements(mode Mode, len int, offsetInBytes int) {
_ = c.runOnContextThread(func() error {
gl.DrawElements(uint32(mode), int32(len), gl.UNSIGNED_SHORT, gl.PtrOffset(offsetInBytes))
return nil
})
}
func (c *Context) VertexAttribPointer(p Program, location string, size int, dataType DataType, normalize bool, stride int, offset int) {
_ = c.runOnContextThread(func() error {
l := c.locationCache.GetAttribLocation(c, p, location)
gl.VertexAttribPointer(uint32(l), int32(size), uint32(dataType), normalize, int32(stride), gl.PtrOffset(offset))
return nil
})
}
