func TextureFromFile(fname string) *glh.Texture {
f, err := os.Open(fname)
if err != nil {
panic(err)
}
// All images will be valid
img, _, _ := image.Decode(f)
width := img.Bounds().Size().X
height := img.Bounds().Size().Y
t := glh.NewTexture(width, height)
t.FromImage(img, 0)
return t
}
func (block *Block) BuildTexture() {
block.tex = glh.NewTexture(1024, 256)
block.tex.Init()
// TODO: use runtime.SetFinalizer() to clean up/delete the texture?
glh.With(block.tex, func() {
//gl.TexParameteri(gl.TEXTURE_2D, gl.GENERATE_MIPMAP, gl.TRUE)
//gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
// TODO: Only try and activate anisotropic filtering if it is available
gl.TexParameterf(gl.TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, MaxAnisotropy)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAX_LEVEL, 1)
})
for i := 0; i < 2; i++ {
glh.With(&glh.Framebuffer{Texture: block.tex, Level: i}, func() {
glh.With(glh.Attrib{gl.COLOR_BUFFER_BIT}, func() {
gl.ClearColor(1, 0, 0, 0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
})
viewport_proj := glh.Compound(glh.Attrib{gl.VIEWPORT_BIT},
glh.Matrix{gl.PROJECTION})
glh.With(viewport_proj, func() {
gl.Viewport(0, 0, block.tex.W/(1<<uint(i)), block.tex.H/(1<<uint(i)))
gl.LoadIdentity()
//gl.Ortho(0, float64(tex.w), 0, float64(tex.h), -1, 1)
gl.Ortho(-2, -2+WIDTH, 2, -2, -1, 1)
glh.With(glh.Matrix{gl.MODELVIEW}, func() {
gl.LoadIdentity()
//gl.Hint(gl.LINES, gl.NICEST)
//gl.LineWidth(4)
/*
glh.With(glh.Primitive{gl.LINES}, func() {
gl.Color4f(1, 1, 1, 1)
gl.Vertex2f(-2, 0)
gl.Vertex2f(2, 0)
})
*/
gl.PointSize(4)
glh.With(glh.Matrix{gl.MODELVIEW}, func() {
gl.Translated(0, -2, 0)
gl.Scaled(1, 4/float64(block.nrecords), 1)
block.vertex_data.Render(gl.POINTS)
})
/*
gl.Color4f(0.5, 0.5, 1, 1)
With(Primitive{gl.LINE_LOOP}, func() {
b := 0.2
Squared(-2.1+b, -2.1+b, 4.35-b*2, 4.2-b*2)
})
*/
})
})
})
}
//block.img = block.tex.AsImage()
if !block.detail_needed {
block.vertex_data = nil
runtime.GC()
}
blocks_rendered++
}
func NewCanvas(w, h int) *Canvas {
buffer := new(glh.Framebuffer)
buffer.Texture = glh.NewTexture(w, h)
buffer.Texture.Init()
return &Canvas{w, h, buffer}
}