func NewSpriteDrawer(window *glfw.Window, layers int) *SpriteDrawer {
s := new(SpriteDrawer)
vao := gl.GenVertexArray()
vao.Bind()
s.Camera = vec2.Identity
s.Program = CreateProgram("shaders/2d.vert", "shaders/2d.geom", "shaders/texture.frag")
s.Use()
s.camera_uniform = s.GetUniformLocation("camera")
s.Texture = gl.GenTexture()
s.Texture.Bind(gl.TEXTURE_2D_ARRAY)
gl.TexImage3D(gl.TEXTURE_2D_ARRAY, 0, gl.RGBA, 2048, 2048, layers, 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
gl.TexParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
s.Window = window
w, h := window.GetSize()
s.OnScreenResize(w, h)
s.Window.SetSizeCallback(func(window *glfw.Window, w, h int) {
s.OnScreenResize(w, h)
})
return s
}
func NewFrameBuffer(width, height int) (this *FrameBuffer) {
this = &FrameBuffer{gl.GenFramebuffer(), gl.GenTexture(), gl.GenTexture()}
this.Resize(width, height)
var outer gl.Framebuffer
{
params := []int32{0}
gl.GetIntegerv(gl.FRAMEBUFFER_BINDING, params)
outer = gl.Framebuffer(params[0])
}
this.Framebuffer.Bind()
gl.FramebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_RECTANGLE, this.RenderTexture, 0)
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.TEXTURE_RECTANGLE, this.DepthTexture, 0)
outer.Bind()
if gl.CheckFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE {
this.Delete()
panic("framebuffer incomplete")
}
return
}
func NewTextureEmpty(width int, height int, model color.Model) *Texture {
internalFormat, typ, format, target, e := ColorModelToGLTypes(model)
if e != nil {
return nil
}
a := gl.GenTexture()
a.Bind(target)
gl.TexImage2D(target, 0, internalFormat, width, height, 0, typ, format, nil)
t := &Texture{a, false, nil, format, typ, internalFormat, target, width, height}
t.SetWraping(WrapS, ClampToEdge)
t.SetWraping(WrapT, ClampToEdge)
t.SetFiltering(Nearest, Nearest)
ResourceManager.Add(t)
return t
}
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 NewTexture2(data interface{}, width int, height int, target gl.GLenum, internalFormat int, typ gl.GLenum, format gl.GLenum) *Texture {
a := gl.GenTexture()
a.Bind(target)
gl.TexImage2D(target, 0, internalFormat, width, height, 0, typ, format, data)
t := &Texture{a, false, data, format, typ, internalFormat, target, width, height}
t.SetWraping(WrapS, ClampToEdge)
t.SetWraping(WrapT, ClampToEdge)
t.SetFiltering(Nearest, Nearest)
//ansi := []float32{0}
//gl.GetFloatv(gl.MAX_TEXTURE_MAX_ANISOTROPY_EXT, ansi)
//gl.TexParameterf(target, gl.TEXTURE_MAX_ANISOTROPY_EXT, ansi[0])
t.PreloadRender() //Forcing texture to go to VRAM and prevent shuttering
t.data = nil
data = nil
ResourceManager.Add(t)
return t
}