func initResources() (uint32, int32) {
vs := CreateShader("triangle.v.glsl", gl.VERTEX_SHADER)
fs := CreateShader("triangle.f.glsl", gl.FRAGMENT_SHADER)
var linkOk int32
program := gl.CreateProgram()
gl.AttachShader(program, vs)
gl.AttachShader(program, fs)
gl.LinkProgram(program)
gl.GetProgramiv(program, gl.LINK_STATUS, &linkOk)
if linkOk == 0 {
log.Fatal("gl.LinkProgram")
}
gl.GenBuffers(1, &vboTriangle)
gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
gl.BufferData(gl.ARRAY_BUFFER, 4*len(triangleVertices), gl.Ptr(triangleVertices), gl.STATIC_DRAW)
attribName := "coord2d\x00"
attribCoord2d := gl.GetAttribLocation(program, gl.Str(attribName))
if attribCoord2d == -1 {
log.Fatal("failed to bind attribute")
}
return program, attribCoord2d
}
func initResources() uint32 {
vs := CreateShader("triangle.v.glsl", gl.VERTEX_SHADER)
fs := CreateShader("triangle.f.glsl", gl.FRAGMENT_SHADER)
var linkOk int32
program := gl.CreateProgram()
gl.AttachShader(program, vs)
gl.AttachShader(program, fs)
gl.LinkProgram(program)
gl.GetProgramiv(program, gl.LINK_STATUS, &linkOk)
if linkOk == 0 {
log.Fatal("gl.LinkProgram")
}
gl.GenBuffers(1, &vboTriangle)
gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
gl.BufferData(gl.ARRAY_BUFFER, floatSize*len(triangleAttributes), gl.Ptr(triangleAttributes), gl.STATIC_DRAW)
attributeCoord2d = gl.GetAttribLocation(program, gl.Str("coord2d\x00"))
if attributeCoord2d == -1 {
log.Fatal("failed to bind attribute")
}
attributeVColor = gl.GetAttribLocation(program, gl.Str("v_color\x00"))
if attributeVColor == -1 {
log.Fatal("could not bind attribute v_color")
}
uniformFade = gl.GetUniformLocation(program, gl.Str("fade\x00"))
if uniformFade == -1 {
log.Fatal("could not bind uniform fade")
}
return program
}
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 NewVbo(length int) *Vbo {
v := &Vbo{
Vertices: make([]float32, length),
}
gl.GenBuffers(1, &v.Id)
gl.BindBuffer(gl.ARRAY_BUFFER, v.Id)
gl.BufferData(gl.ARRAY_BUFFER, length*FloatSize, gl.Ptr(v.Vertices), gl.STATIC_DRAW)
return v
}
func newMultitouchTestBoxWidget(pos mgl64.Vec2, color int) MultitouchTestBoxWidget {
var buffer uint32
gl.GenBuffers(1, &buffer)
gl.BindBuffer(gl.ARRAY_BUFFER, buffer)
vertices := []float32{
0, 0,
0, 200,
200, 200,
200, 0,
}
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*4, gl.Ptr(vertices), gl.STATIC_DRAW)
return MultitouchTestBoxWidget{pos: pos, color: color, buffer: buffer}
}
func NewBuffer(idata interface{}, opts ...BufferOption) (*Buffer, error) {
opt := bufferOption{
freq: STATIC,
nature: DRAW,
bindpoint: gl.ARRAY_BUFFER,
}
for _, o := range opts {
o(&opt)
}
var usage uint32
switch int(opt.freq) | int(opt.nature) {
case int(STATIC) | int(DRAW):
usage = gl.STATIC_DRAW
case int(STATIC) | int(READ):
usage = gl.STATIC_READ
case int(STATIC) | int(COPY):
usage = gl.STATIC_COPY
case int(STREAM) | int(DRAW):
usage = gl.STREAM_DRAW
case int(STREAM) | int(READ):
usage = gl.STREAM_READ
case int(STREAM) | int(COPY):
usage = gl.STREAM_COPY
case int(DYNAMIC) | int(DRAW):
usage = gl.DYNAMIC_DRAW
case int(DYNAMIC) | int(READ):
usage = gl.DYNAMIC_READ
case int(DYNAMIC) | int(COPY):
usage = gl.DYNAMIC_COPY
default:
panic(fmt.Errorf("Could not resolve buffer usage from options"))
}
data, err := resolveData(idata)
if err != nil {
return nil, err
}
var id uint32
gl.GenBuffers(1, &id)
buffer := &Buffer{
id: id,
data: data.iDataDesc,
usage: usage,
bindpoint: opt.bindpoint,
}
buffer.Upload(idata)
return buffer, nil
}
func (c *Context) NewBuffer(bufferType BufferType, v interface{}, bufferUsage BufferUsage) Buffer {
var b uint32
gl.GenBuffers(1, &b)
gl.BindBuffer(uint32(bufferType), b)
size := 0
ptr := v
switch v := v.(type) {
case int:
size = v
ptr = nil
case []uint16:
size = 2 * len(v)
case []float32:
size = 4 * len(v)
default:
panic("not reach")
}
gl.BufferData(uint32(bufferType), size, gl.Ptr(ptr), uint32(bufferUsage))
return Buffer(b)
}
func (c *Context) NewBuffer(bufferType BufferType, v interface{}, bufferUsage BufferUsage) Buffer {
var buffer Buffer
_ = c.runOnContextThread(func() error {
var b uint32
gl.GenBuffers(1, &b)
gl.BindBuffer(uint32(bufferType), b)
switch v := v.(type) {
case int:
gl.BufferData(uint32(bufferType), v, nil, uint32(bufferUsage))
case []uint16:
// TODO: What about the endianness?
gl.BufferData(uint32(bufferType), 2*len(v), gl.Ptr(v), uint32(bufferUsage))
default:
panic("not reach")
}
buffer = Buffer(b)
return nil
})
return buffer
}
// CreateBuffer creates a buffer object.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glGenBuffers.xhtml
func CreateBuffer() Buffer {
var b Buffer
gl.GenBuffers(1, &b.Value)
return b
}
func (c *Context) CreateBuffer() *Buffer {
var loc uint32
gl.GenBuffers(1, &loc)
return &Buffer{loc}
}
func (m *Mesh) initMeshData() {
gl.GenBuffers(1, &m.vbo)
gl.GenBuffers(1, &m.ibo)
m.size = 0
}
func (*backend) CreateBuffer() *gg.Buffer {
var b uint32
gl.GenBuffers(1, &b)
return &gg.Buffer{Value: b}
}