v/vlib/gg/image.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
module gg
// import gx
// import sokol.sapp
// import sokol.gfx
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import os
import sokol
import sokol.sgl
import stbi
pub struct Image {
pub mut:
id int
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width int
height int
nr_channels int
ok bool
data voidptr
ext string
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simg_ok bool
simg C.sg_image
path string
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}
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fn C.sg_isvalid() bool
// TODO return ?Image
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pub fn (mut ctx Context) create_image(file string) Image {
if !C.sg_isvalid() {
// Sokol is not initialized yet, add stbi object to a queue/cache
// ctx.image_queue << file
stb_img := stbi.load(file) or {
return Image{}
}
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img := Image{
width: stb_img.width
height: stb_img.height
nr_channels: stb_img.nr_channels
ok: false
data: stb_img.data
ext: stb_img.ext
path: file
id: ctx.image_cache.len
}
ctx.image_cache << img
return img
}
mut img := create_image(file)
img.id = ctx.image_cache.len
ctx.image_cache << img
return img
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}
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// TODO remove this
fn create_image(file string) Image {
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if !os.exists(file) {
println('gg.create_image(): file not found: $file')
return Image{} // none
}
stb_img := stbi.load(file) or {
return Image{}
}
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mut img := Image{
width: stb_img.width
height: stb_img.height
nr_channels: stb_img.nr_channels
ok: stb_img.ok
data: stb_img.data
ext: stb_img.ext
path: file
}
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img.init_sokol_image()
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return img
}
pub fn create_image_from_memory(buf byteptr, bufsize int) Image {
stb_img := stbi.load_from_memory(buf, bufsize) or {
return Image{}
}
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mut img := Image{
width: stb_img.width
height: stb_img.height
nr_channels: stb_img.nr_channels
ok: stb_img.ok
data: stb_img.data
ext: stb_img.ext
}
return img
}
pub fn create_image_from_byte_array(b []byte) Image {
return create_image_from_memory(b.data, b.len)
}
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pub fn (mut img Image) init_sokol_image() &Image {
// println('\n init sokol image $img.path ok=$img.simg_ok')
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mut img_desc := C.sg_image_desc{
width: img.width
height: img.height
num_mipmaps: 0
wrap_u: .clamp_to_edge
wrap_v: .clamp_to_edge
label: &byte(0)
d3d11_texture: 0
}
img_desc.content.subimage[0][0] = C.sg_subimage_content{
ptr: img.data
size: img.nr_channels * img.width * img.height
}
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img.simg = C.sg_make_image(&img_desc)
img.simg_ok = true
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img.ok = true
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return img
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}
pub fn (ctx &Context) draw_image(x f32, y f32, width f32, height f32, img_ &Image) {
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if img_.id >= ctx.image_cache.len {
eprintln('gg: draw_image() bad img id $img_.id (img cache len = $ctx.image_cache.len)')
return
}
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img := ctx.image_cache[img_.id] // fetch the image from cache
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if !img.simg_ok {
return
}
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u0 := f32(0.0)
v0 := f32(0.0)
u1 := f32(1.0)
v1 := f32(1.0)
x0 := f32(x) * ctx.scale
y0 := f32(y) * ctx.scale
x1 := f32(x + width) * ctx.scale
y1 := f32(y + height) * ctx.scale
//
sgl.load_pipeline(ctx.timage_pip)
sgl.enable_texture()
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sgl.texture(img.simg)
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sgl.begin_quads()
sgl.c4b(255, 255, 255, 255)
sgl.v2f_t2f(x0, y0, u0, v0)
sgl.v2f_t2f(x1, y0, u1, v0)
sgl.v2f_t2f(x1, y1, u1, v1)
sgl.v2f_t2f(x0, y1, u0, v1)
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sgl.end()
sgl.disable_texture()
}
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// TODO remove copy pasta, merge the functions
pub fn (ctx &Context) draw_image_flipped(x f32, y f32, width f32, height f32, img_ &Image) {
if img_.id >= ctx.image_cache.len {
eprintln('gg: draw_image() bad img id $img_.id (img cache len = $ctx.image_cache.len)')
return
}
img := ctx.image_cache[img_.id] // fetch the image from cache
if !img.simg_ok {
return
}
u0 := f32(0.0)
v0 := f32(0.0)
u1 := f32(1.0)
v1 := f32(1.0)
x0 := f32(x) * ctx.scale
y0 := f32(y) * ctx.scale
x1 := f32(x + width) * ctx.scale
y1 := f32(y + height) * ctx.scale
//
sgl.load_pipeline(ctx.timage_pip)
sgl.enable_texture()
sgl.texture(img.simg)
sgl.begin_quads()
sgl.c4b(255, 255, 255, 255)
sgl.v2f_t2f(x0, y0, u1, v0)
sgl.v2f_t2f(x1, y0, u0, v0)
sgl.v2f_t2f(x1, y1, u0, v1)
sgl.v2f_t2f(x0, y1, u1, v1)
sgl.end()
sgl.disable_texture()
}
pub fn (ctx &Context) draw_image_by_id(x f32, y f32, width f32, height f32, id int) {
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img := ctx.image_cache[id]
ctx.draw_image(x, y, width, height, img)
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}