func (r *EffectsRenderer) initFramebuffer(w, h int) (fb uint32, tex uint32, err error) {
gl.GenFramebuffers(1, &fb)
gl.BindFramebuffer(gl.FRAMEBUFFER, fb)
gl.GenTextures(1, &tex)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(w), int32(h), 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
gl.FramebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0)
if err = r.GetError(); err != nil {
return
}
buffers := []uint32{gl.COLOR_ATTACHMENT0}
gl.DrawBuffers(1, &buffers[0])
var rb uint32
gl.GenRenderbuffers(1, &rb)
gl.BindRenderbuffer(gl.RENDERBUFFER, rb)
gl.RenderbufferStorage(gl.RENDERBUFFER, gl.STENCIL_INDEX8, int32(w), int32(h))
gl.FramebufferRenderbuffer(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, rb)
gl.BindTexture(gl.TEXTURE_2D, 0)
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.BindRenderbuffer(gl.RENDERBUFFER, 0)
return
}
func (r *GlowRenderer) Draw() (err error) {
gl.UseProgram(r.shader)
gl.Uniform1i(r.textureUnitLoc, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, r.coords)
gl.EnableVertexAttribArray(r.positionLoc)
gl.VertexAttribPointer(r.positionLoc, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
gl.EnableVertexAttribArray(r.textureLoc)
gl.VertexAttribPointer(r.textureLoc, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))
gl.Uniform1i(r.blurAmountLoc, int32(r.blur))
gl.Uniform1f(r.blurScaleLoc, r.scale)
gl.Uniform1f(r.blurStrengthLoc, r.strength)
gl.Uniform2f(r.bufferDimensionsLoc, float32(r.width), float32(r.height))
gl.BindFramebuffer(gl.FRAMEBUFFER, r.BlurFb)
gl.Viewport(0, 0, int32(r.width), int32(r.height))
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, r.GlowTex)
gl.Uniform1i(r.orientationLoc, 0)
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.Viewport(0, 0, int32(r.oldwidth), int32(r.oldheight))
gl.BlendFunc(gl.ONE, gl.ONE)
gl.BindTexture(gl.TEXTURE_2D, r.BlurTex)
gl.Uniform1i(r.orientationLoc, 1)
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
return nil
}
func getGLTexture(img image.Image, smoothing TextureSmoothing) (t uint32, err error) {
var (
data *bytes.Buffer
bounds image.Rectangle
width int
height int
)
if data, err = imageBytes(img); err != nil {
return
}
bounds = img.Bounds()
width = bounds.Max.X - bounds.Min.X
height = bounds.Max.Y - bounds.Min.Y
gl.GenTextures(1, &t)
gl.BindTexture(gl.TEXTURE_2D, t)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int32(smoothing))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int32(smoothing))
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
int32(width),
int32(height),
0,
gl.RGBA,
gl.UNSIGNED_INT_8_8_8_8,
gl.Ptr(data.Bytes()),
)
gl.GenerateMipmap(gl.TEXTURE_2D)
gl.BindTexture(gl.TEXTURE_2D, 0)
return
}
func LoadText(f *Font) (t *Text) {
t = new(Text)
t.font = f
// text hover values
// "resting state" of a text object is the min scale
t.ScaleMin = 1.0
t.ScaleMax = 1.1
t.SetScale(1)
// size of glfloat
glfloat_size := int32(4)
// stride of the buffered data
xy_count := int32(2)
stride := xy_count + int32(2)
gl.GenVertexArrays(1, &t.vao)
gl.GenBuffers(1, &t.vbo)
gl.GenBuffers(1, &t.ebo)
// vao
gl.BindVertexArray(t.vao)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, t.font.textureID)
// vbo
// specify the buffer for which the VertexAttribPointer calls apply
gl.BindBuffer(gl.ARRAY_BUFFER, t.vbo)
gl.EnableVertexAttribArray(t.font.centeredPosition)
gl.VertexAttribPointer(
t.font.centeredPosition,
2,
gl.FLOAT,
false,
glfloat_size*stride,
gl.PtrOffset(0),
)
gl.EnableVertexAttribArray(t.font.uv)
gl.VertexAttribPointer(
t.font.uv,
2,
gl.FLOAT,
false,
glfloat_size*stride,
gl.PtrOffset(int(glfloat_size*xy_count)),
)
// ebo
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, t.ebo)
// i am guessing that order is important here
gl.BindVertexArray(0)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0)
return t
}
func (t *Text) Draw() {
if t.IsDebug {
t.BoundingBox.Draw()
}
gl.UseProgram(t.font.program)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, t.font.textureID)
// uniforms
gl.Uniform1i(t.font.fragmentTextureUniform, 0)
gl.Uniform4fv(t.font.colorUniform, 1, &t.color[0])
gl.Uniform2fv(t.font.finalPositionUniform, 1, &t.finalPosition[0])
gl.UniformMatrix4fv(t.font.orthographicMatrixUniform, 1, false, &t.font.OrthographicMatrix[0])
gl.UniformMatrix4fv(t.font.scaleMatrixUniform, 1, false, &t.scaleMatrix[0])
// draw
drawCount := int32(t.RuneCount * 6)
if drawCount > int32(t.eboIndexCount) {
drawCount = int32(t.eboIndexCount)
}
if drawCount < 0 {
drawCount = 0
}
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.BindVertexArray(t.vao)
gl.DrawElements(gl.TRIANGLES, drawCount, gl.UNSIGNED_INT, nil)
gl.BindVertexArray(0)
gl.Disable(gl.BLEND)
}
func newTexture(file string, texNum uint32) (uint32, error) {
imgFile, err := os.Open(file)
if err != nil {
return 0, err
}
img, _, err := image.Decode(imgFile)
rgba := image.NewRGBA(img.Bounds())
if rgba.Stride != rgba.Rect.Size().X*4 {
return 0, fmt.Errorf("unsupported stride")
}
draw.Draw(rgba, rgba.Bounds(), img, image.ZP, draw.Src)
var texture uint32
gl.GenTextures(1, &texture)
gl.ActiveTexture(texNum)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA,
int32(rgba.Rect.Size().X), int32(rgba.Rect.Size().Y),
0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(rgba.Pix))
return texture, nil
}
func (t *Texture) Delete() {
if t.id != 0 {
gl.BindTexture(gl.TEXTURE_2D, 0)
gl.DeleteTextures(1, &t.id)
t.id = 0
}
}
func (tr *TextRenderer) Draw(tex *Texture, x, y, scale float32) (err error) {
gl.ActiveTexture(gl.TEXTURE0)
if e := gl.GetError(); e != 0 {
return fmt.Errorf("ERROR: %X", e)
}
gl.BindTexture(gl.TEXTURE_2D, tex.Texture)
if e := gl.GetError(); e != 0 {
return fmt.Errorf("ERROR: %X", e)
}
gl.Uniform3f(tr.ScaleLoc, float32(tex.Width)*scale, float32(tex.Height)*scale, 1)
if e := gl.GetError(); e != 0 {
return fmt.Errorf("ERROR: %X", e)
}
gl.Uniform3f(tr.TransLoc, x, y, 0)
if e := gl.GetError(); e != 0 {
return fmt.Errorf("ERROR: %X", e)
}
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
if e := gl.GetError(); e != 0 {
return fmt.Errorf("ERROR: %X", e)
}
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
if e := gl.GetError(); e != 0 {
return fmt.Errorf("ERROR: %X", e)
}
return nil
}
func (texture Texture) Bind(textureSlot int) {
if textureSlot > int(gl.TEXTURE31) {
tlog.Panic("active texture slot too large: ", textureSlot)
}
gl.ActiveTexture(uint32(gl.TEXTURE0 + textureSlot))
Check()
gl.BindTexture(gl.TEXTURE_2D, uint32(texture))
Check()
}
func GetGLTexture(img image.Image, smoothing TextureSmoothing) (t uint32, err error) {
var (
data *bytes.Buffer
bounds image.Rectangle
width int
height int
)
if data, err = imageBytes(img); err != nil {
return
}
bounds = img.Bounds()
width = bounds.Max.X - bounds.Min.X
height = bounds.Max.Y - bounds.Min.Y
gl.GenTextures(1, &t)
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt1 ERROR: %s\n", e)
}
gl.BindTexture(gl.TEXTURE_2D, t)
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt2 ERROR: %s\n", e)
}
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int32(smoothing))
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt3 ERROR: %s\n", e)
}
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int32(smoothing))
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt4 ERROR: %s\n", e)
}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(width), int32(height), 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, gl.Ptr(data.Bytes()))
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt5 ERROR: %s\n", e)
}
gl.GenerateMipmap(gl.TEXTURE_2D)
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt6 ERROR: %s\n", e)
}
gl.BindTexture(gl.TEXTURE_2D, 0)
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt7 ERROR: %s\n", e)
}
return
}
func (r *EffectsRenderer) Delete() error {
gl.BindTexture(gl.TEXTURE_2D, 0)
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.BindRenderbuffer(gl.RENDERBUFFER, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.DeleteFramebuffers(1, &r.framebuffer)
gl.DeleteTextures(1, &r.texture)
gl.DeleteBuffers(1, &r.coords)
return r.GetError()
}
func (r *GlowRenderer) Delete() error {
gl.BindTexture(gl.TEXTURE_2D, 0)
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.BindRenderbuffer(gl.RENDERBUFFER, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.DeleteFramebuffers(1, &r.GlowFb)
gl.DeleteTextures(1, &r.GlowTex)
gl.DeleteFramebuffers(1, &r.BlurFb)
gl.DeleteTextures(1, &r.BlurTex)
gl.DeleteBuffers(1, &r.coords)
return r.GetError()
}
func (renderObject *RenderObject) Render() {
gl.BindVertexArray(renderObject.vao)
gl.BindBuffer(gl.ARRAY_BUFFER, renderObject.vbo)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, renderObject.ebo)
gl.UseProgram(renderObject.shaderProgram)
// Binding the texture.
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, renderObject.texture)
gl.BindFragDataLocation(renderObject.shaderProgram, 0, gl.Str("outputColor\x00"))
// Drawing the object.
gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, nil)
}
func createTexture(textureUnit uint32, rgba *image.RGBA) (uint32, error) {
var texture uint32
gl.GenTextures(1, &texture)
gl.ActiveTexture(textureUnit)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(rgba.Rect.Size().X), int32(rgba.Rect.Size().Y), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(rgba.Pix))
return texture, nil
}
// Attempting to load a Texture from a given location on the disk.
func LoadTexture(path string) (Texture, error) {
// Loading the image data.
imgFile, err := os.Open(path)
if err != nil {
return 0, err
}
img, _, err := image.Decode(imgFile)
if err != nil {
return 0, err
}
rgba := image.NewRGBA(img.Bounds())
if rgba.Stride != rgba.Rect.Size().X*4 {
return 0, errors.New("Unsupported stride.")
}
draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)
// Generating and populating the texture.
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.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
int32(rgba.Rect.Size().X),
int32(rgba.Rect.Size().Y),
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(rgba.Pix))
return Texture(texture), nil
}
// RenderString must be called on the render thread. x and y are the initial position of the pen,
// in screen coordinates, and height is the height of a full line of text, in screen coordinates.
func (d *Dictionary) RenderString(str string, x, y, height float64) {
if str == "" {
return
}
// No synchronization necessary because everything is run serially on the render thread anyway.
if d.strs == nil {
d.strs = make(map[string]strData)
}
data, ok := d.strs[str]
if !ok {
data = d.bindString(str)
d.strs[str] = data
}
render.EnableShader("glop.font")
defer render.EnableShader("")
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, d.atlas.texture)
location, _ := render.GetUniformLocation("glop.font", "tex")
gl.Uniform1i(location, 0)
gl.BindSampler(0, d.atlas.sampler)
location, _ = render.GetUniformLocation("glop.font", "height")
gl.Uniform1f(location, float32(height))
var viewport [4]int32
gl.GetIntegerv(gl.VIEWPORT, &viewport[0])
location, _ = render.GetUniformLocation("glop.font", "screen")
gl.Uniform2f(location, float32(viewport[2]), float32(viewport[3]))
location, _ = render.GetUniformLocation("glop.font", "pen")
gl.Uniform2f(location, float32(x)+float32(viewport[0]), float32(y)+float32(viewport[1]))
location, _ = render.GetUniformLocation("glop.font", "textColor")
gl.Uniform3f(location, d.color[0], d.color[1], d.color[2])
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.BindVertexArray(data.varrays[0])
gl.DrawArrays(gl.TRIANGLES, 0, data.count)
}
func LoadImageToTexture(filePath string) (glTex uint32, e error) {
gl.GenTextures(1, &glTex)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, glTex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
rgba_flipped, err := loadFile(filePath)
if err != nil {
return glTex, err
}
imageSize := int32(rgba_flipped.Bounds().Max.X)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, imageSize, imageSize, 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(rgba_flipped.Pix))
gl.GenerateMipmap(gl.TEXTURE_2D)
return glTex, nil
}
func (r *EffectsRenderer) Draw() (err error) {
gl.UseProgram(r.shader)
gl.Uniform1i(r.textureUnitLoc, 0)
gl.Uniform3f(r.colorLoc, r.Color[0], r.Color[1], r.Color[2])
gl.BindBuffer(gl.ARRAY_BUFFER, r.coords)
gl.EnableVertexAttribArray(r.positionLoc)
gl.VertexAttribPointer(r.positionLoc, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
gl.EnableVertexAttribArray(r.textureLoc)
gl.VertexAttribPointer(r.textureLoc, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.Viewport(0, 0, int32(r.oldwidth), int32(r.oldheight))
gl.BlendFunc(gl.ONE, gl.ONE)
gl.BindTexture(gl.TEXTURE_2D, r.texture)
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
return nil
}
func CreateTexture(file string) (Texture, error) {
imgFile, err := os.Open(file)
if err != nil {
return Texture{}, err
}
img, _, err := image.Decode(imgFile)
if err != nil {
return Texture{}, err
}
rgba := image.NewRGBA(img.Bounds())
if rgba.Stride != rgba.Rect.Size().X*4 {
return Texture{}, fmt.Errorf("unsupported stride")
}
draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)
width, height := int32(rgba.Rect.Size().X), int32(rgba.Rect.Size().Y)
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.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
width,
height,
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(rgba.Pix))
return Texture{Id: texture, Width: width, Height: height}, nil
}
func bindAggregateImage(img image.Image, idx int) uint32 {
newIdx := idx
if rgba, ok := img.(*image.RGBA); ok {
gl.GenTextures(1, &textures[newIdx])
gl.ActiveTexture(gl.TEXTURE0 + uint32(newIdx))
gl.BindTexture(gl.TEXTURE_2D, textures[newIdx])
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(rgba.Rect.Size().X), int32(rgba.Rect.Size().Y), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(rgba.Pix))
gl.GenerateMipmap(gl.TEXTURE_2D)
idxS := strconv.Itoa(newIdx)
fmt.Println("idx: ", int32(newIdx), "myTextureSampler["+idxS+"]\x00")
gl.Uniform1i(gl.GetUniformLocation(program, gl.Str("myTextureSampler["+idxS+"]\x00")), int32(newIdx))
if ok := gl.GetError(); ok != gl.NO_ERROR {
fmt.Println("1- Cannot load Image in location: ./: ", ok)
os.Exit(-1)
}
return textures[newIdx]
} else {
fmt.Println("Image not RGBA at location: ./")
os.Exit(-1)
}
return 0
}
func (t Texture) Bind() {
gl.BindTexture(gl.TEXTURE_2D, t.Id)
}
func loadFont(img *image.RGBA, config *FontConfig) (f *Font, err error) {
f = new(Font)
f.config = config
// Resize image to next power-of-two.
img = Pow2Image(img).(*image.RGBA)
ib := img.Bounds()
f.textureWidth = float32(ib.Dx())
f.textureHeight = float32(ib.Dy())
for _, glyph := range config.Glyphs {
if glyph.Width > f.maxGlyphWidth {
f.maxGlyphWidth = glyph.Width
}
if glyph.Height > f.maxGlyphHeight {
f.maxGlyphHeight = glyph.Height
}
}
// save to disk for testing
if f.IsDebug {
file, err := os.Create("out.png")
if err != nil {
panic(err)
}
defer file.Close()
b := bufio.NewWriter(file)
err = png.Encode(b, img)
if err != nil {
panic(err)
}
err = b.Flush()
if err != nil {
panic(err)
}
}
// generate texture
gl.GenTextures(1, &f.textureID)
gl.BindTexture(gl.TEXTURE_2D, f.textureID)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
int32(ib.Dx()),
int32(ib.Dy()),
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(img.Pix),
)
gl.BindTexture(gl.TEXTURE_2D, 0)
// create shader program and define attributes and uniforms
f.program, err = NewProgram(fontVertexShaderSource, fontFragmentShaderSource)
if err != nil {
return f, err
}
// attributes
f.centeredPosition = uint32(gl.GetAttribLocation(f.program, gl.Str("centered_position\x00")))
f.uv = uint32(gl.GetAttribLocation(f.program, gl.Str("uv\x00")))
// uniforms
f.finalPositionUniform = gl.GetUniformLocation(f.program, gl.Str("final_position\x00"))
f.orthographicMatrixUniform = gl.GetUniformLocation(f.program, gl.Str("orthographic_matrix\x00"))
f.scaleMatrixUniform = gl.GetUniformLocation(f.program, gl.Str("scale_matrix\x00"))
f.fragmentTextureUniform = gl.GetUniformLocation(f.program, gl.Str("fragment_texture\x00"))
f.colorUniform = gl.GetUniformLocation(f.program, gl.Str("fragment_color_adjustment\x00"))
return f, nil
}
// LoadDictionary reads a gobbed Dictionary object from r, registers its atlas texture with opengl,
// and returns a Dictionary that is ready to render text.
func LoadDictionary(r io.Reader) (*Dictionary, error) {
errChan := make(chan error)
initOnce.Do(func() {
render.Queue(func() {
// errChan <- render.RegisterShader("glop.font", []byte(font_vertex_shader), []byte(font_fragment_shader))
errChan <- render.RegisterShader("glop.font", []byte(font_vshader), []byte(font_fshader))
})
})
err := <-errChan
if err != nil {
return nil, err
}
var dict Dictionary
dec := gob.NewDecoder(r)
err = dec.Decode(&dict)
if err != nil {
return nil, err
}
render.Queue(func() {
// Create the gl texture for the atlas
gl.GenTextures(1, &dict.atlas.texture)
glerr := gl.GetError()
if glerr != 0 {
errChan <- fmt.Errorf("Gl Error on gl.GenTextures: %v", glerr)
return
}
// Send the atlas to opengl
gl.BindTexture(gl.TEXTURE_2D, dict.atlas.texture)
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 1)
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RED,
dict.Dx,
dict.Dy,
0,
gl.RED,
gl.UNSIGNED_BYTE,
gl.Ptr(&dict.Pix[0]))
glerr = gl.GetError()
if glerr != 0 {
errChan <- fmt.Errorf("Gl Error on creating texture: %v", glerr)
return
}
// Create the atlas sampler and set the parameters we want for it
gl.GenSamplers(1, &dict.atlas.sampler)
gl.SamplerParameteri(dict.atlas.sampler, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.SamplerParameteri(dict.atlas.sampler, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.SamplerParameteri(dict.atlas.sampler, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.SamplerParameteri(dict.atlas.sampler, gl.TEXTURE_WRAP_T, gl.REPEAT)
glerr = gl.GetError()
if glerr != 0 {
errChan <- fmt.Errorf("Gl Error on creating sampler: %v", glerr)
return
}
errChan <- nil
})
err = <-errChan
if err != nil {
return nil, err
}
return &dict, nil
}
func (r *Renderable) Draw(perspective mgl.Mat4, view mgl.Mat4) {
gl.UseProgram(r.Shader)
gl.BindVertexArray(r.Vao)
model := r.GetTransformMat4()
var mvp mgl.Mat4
shaderMvp := getUniformLocation(r.Shader, "MVP_MATRIX")
if shaderMvp >= 0 {
mvp = perspective.Mul4(view).Mul4(model)
gl.UniformMatrix4fv(shaderMvp, 1, false, &mvp[0])
}
shaderMv := getUniformLocation(r.Shader, "MV_MATRIX")
if shaderMv >= 0 {
mv := view.Mul4(model)
gl.UniformMatrix4fv(shaderMv, 1, false, &mv[0])
}
shaderTex0 := getUniformLocation(r.Shader, "DIFFUSE_TEX")
if shaderTex0 >= 0 {
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, r.Tex0)
gl.Uniform1i(shaderTex0, 0)
}
shaderColor := getUniformLocation(r.Shader, "MATERIAL_DIFFUSE")
if shaderColor >= 0 {
gl.Uniform4f(shaderColor, r.Color[0], r.Color[1], r.Color[2], r.Color[3])
}
shaderTex1 := getUniformLocation(r.Shader, "MATERIAL_TEX_0")
if shaderTex1 >= 0 {
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, r.Tex0)
gl.Uniform1i(shaderTex1, 0)
}
shaderCameraWorldPos := getUniformLocation(r.Shader, "CAMERA_WORLD_POSITION")
if shaderCameraWorldPos >= 0 {
gl.Uniform3f(shaderCameraWorldPos, -view[12], -view[13], -view[14])
}
shaderPosition := getAttribLocation(r.Shader, "VERTEX_POSITION")
if shaderPosition >= 0 {
gl.BindBuffer(gl.ARRAY_BUFFER, r.VertVBO)
gl.EnableVertexAttribArray(uint32(shaderPosition))
gl.VertexAttribPointer(uint32(shaderPosition), 3, gl.FLOAT, false, 0, gl.PtrOffset(0))
}
shaderNormal := getAttribLocation(r.Shader, "VERTEX_NORMAL")
if shaderNormal >= 0 {
gl.BindBuffer(gl.ARRAY_BUFFER, r.NormsVBO)
gl.EnableVertexAttribArray(uint32(shaderNormal))
gl.VertexAttribPointer(uint32(shaderNormal), 3, gl.FLOAT, false, 0, gl.PtrOffset(0))
}
shaderVertUv := getAttribLocation(r.Shader, "VERTEX_UV_0")
if shaderVertUv >= 0 {
gl.BindBuffer(gl.ARRAY_BUFFER, r.UvVBO)
gl.EnableVertexAttribArray(uint32(shaderVertUv))
gl.VertexAttribPointer(uint32(shaderVertUv), 2, gl.FLOAT, false, 0, gl.PtrOffset(0))
}
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, r.ElementsVBO)
gl.DrawElements(gl.TRIANGLES, int32(r.FaceCount*3), gl.UNSIGNED_INT, gl.PtrOffset(0))
gl.BindVertexArray(0)
}
func (t *Texture) Bind() {
gl.BindTexture(gl.TEXTURE_2D, t.id)
}
func (t *Texture) Unbind() {
gl.BindTexture(gl.TEXTURE_2D, 0)
}