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v/vlib/gg/image.v

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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// 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
[heap]
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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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// DrawImageConfig struct defines the various options
// that can be used to draw an image onto the screen
pub struct DrawImageConfig {
pub:
flip_x bool
flip_y bool
img &Image = voidptr(0)
img_id int
img_rect Rect // defines the size and position on image when rendering to the screen
part_rect Rect // defines the size and position of part of the image to use when rendering
rotate int // amount to rotate the image in degrees
z f32
}
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pub struct Rect {
pub:
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x f32
y f32
width f32
height f32
}
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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 {
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// println('\ncreate_image("$file")')
if !os.exists(file) {
return Image{}
}
$if macos {
if ctx.native_rendering {
// return C.darwin_create_image(file)
mut img := C.darwin_create_image(file)
// println('created macos image: $img.path w=$img.width')
// C.printf('p = %p\n', img.data)
img.id = ctx.image_cache.len
ctx.image_cache << img
return img
}
}
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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 copypasta
pub fn (mut ctx Context) create_image_with_size(file string, width int, height int) 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{} }
img := Image{
width: width
height: 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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// 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
}
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pub fn (mut ctx Context) create_image_from_memory(buf &byte, 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
id: ctx.image_cache.len
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}
ctx.image_cache << img
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return img
}
pub fn (mut ctx Context) create_image_from_byte_array(b []byte) Image {
return ctx.create_image_from_memory(b.data, b.len)
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}
pub fn (mut ctx Context) cache_image(img Image) int {
ctx.image_cache << img
image_idx := ctx.image_cache.len - 1
ctx.image_cache[image_idx].id = image_idx
return image_idx
}
pub fn (mut ctx Context) get_cached_image_by_idx(image_idx int) &Image {
return &ctx.image_cache[image_idx]
}
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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: img.path.str
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d3d11_texture: 0
}
img_desc.data.subimage[0][0] = C.sg_range{
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ptr: img.data
size: size_t(img.nr_channels * img.width * img.height)
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}
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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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}
// new_streaming_image returns a cached `image_idx` of a special image, that
// can be updated *each frame* by calling: gg.update_pixel_data(image_idx, buf)
// ... where buf is a pointer to the actual pixel data for the image.
// NB: you still need to call app.gg.draw_image after that, to actually draw it.
pub fn (mut ctx Context) new_streaming_image(w int, h int, channels int) int {
mut img := Image{}
img.width = w
img.height = h
img.nr_channels = channels // 4 bytes per pixel for .rgba8, see pixel_format
mut img_desc := C.sg_image_desc{
width: img.width
height: img.height
pixel_format: .rgba8
num_slices: 1
num_mipmaps: 1
usage: .stream
wrap_u: .clamp_to_edge
wrap_v: .clamp_to_edge
min_filter: .linear
mag_filter: .linear
label: img.path.str
}
// Sokol requires that streamed images have NO .ptr/.size initially:
img_desc.data.subimage[0][0] = C.sg_range{
ptr: 0
size: size_t(0)
}
img.simg = C.sg_make_image(&img_desc)
img.simg_ok = true
img.ok = true
img_idx := ctx.cache_image(img)
return img_idx
}
// update_pixel_data is a helper for working with image streams (i.e. images,
// that are updated dynamically by the CPU on each frame)
pub fn (mut ctx Context) update_pixel_data(cached_image_idx int, buf &byte) {
mut image := ctx.get_cached_image_by_idx(cached_image_idx)
image.update_pixel_data(buf)
}
pub fn (mut img Image) update_pixel_data(buf &byte) {
mut data := C.sg_image_data{}
data.subimage[0][0].ptr = buf
data.subimage[0][0].size = size_t(img.width * img.height * img.nr_channels)
gfx.update_image(img.simg, &data)
}
// draw_image_with_config takes in a config that details how the
// provided image should be drawn onto the screen
pub fn (ctx &Context) draw_image_with_config(config DrawImageConfig) {
id := if !isnil(config.img) { config.img.id } else { config.img_id }
if id >= ctx.image_cache.len {
eprintln('gg: draw_image() bad img id $id (img cache len = $ctx.image_cache.len)')
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return
}
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img := ctx.image_cache[id]
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if !img.simg_ok {
return
}
mut img_rect := config.img_rect
if img_rect.width == 0 && img_rect.height == 0 {
img_rect = Rect{img_rect.x, img_rect.y, img.width, img.height}
}
mut part_rect := config.part_rect
if part_rect.width == 0 && part_rect.height == 0 {
part_rect = Rect{part_rect.x, part_rect.y, img.width, img.height}
}
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u0 := part_rect.x / img.width
v0 := part_rect.y / img.height
u1 := (part_rect.x + part_rect.width) / img.width
v1 := (part_rect.y + part_rect.height) / img.height
x0 := img_rect.x * ctx.scale
y0 := img_rect.y * ctx.scale
x1 := (img_rect.x + img_rect.width) * ctx.scale
mut y1 := (img_rect.y + img_rect.height) * ctx.scale
if img_rect.height == 0 {
scale := f32(img.width) / f32(img_rect.width)
y1 = f32(img_rect.y + int(f32(img.height) / scale)) * ctx.scale
}
flip_x := config.flip_x
flip_y := config.flip_y
mut u0f := if !flip_x { u0 } else { u1 }
mut u1f := if !flip_x { u1 } else { u0 }
mut v0f := if !flip_y { v0 } else { v1 }
mut v1f := if !flip_y { v1 } else { v0 }
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sgl.load_pipeline(ctx.timage_pip)
sgl.enable_texture()
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sgl.texture(img.simg)
if config.rotate != 0 {
width := img_rect.width * ctx.scale
height := (if img_rect.height > 0 { img_rect.height } else { img.height }) * ctx.scale
sgl.push_matrix()
sgl.translate(x0 + (width / 2), y0 + (height / 2), 0)
sgl.rotate(sgl.rad(-config.rotate), 0, 0, 1)
sgl.translate(-x0 - (width / 2), -y0 - (height / 2), 0)
}
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sgl.begin_quads()
sgl.c4b(255, 255, 255, 255)
sgl.v3f_t2f(x0, y0, config.z, u0f, v0f)
sgl.v3f_t2f(x1, y0, config.z, u1f, v0f)
sgl.v3f_t2f(x1, y1, config.z, u1f, v1f)
sgl.v3f_t2f(x0, y1, config.z, u0f, v1f)
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sgl.end()
if config.rotate != 0 {
sgl.pop_matrix()
}
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sgl.disable_texture()
}
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// Draw part of an image using uv coordinates
// img_rect is the size and position (in pixels on screen) of the displayed rectangle (ie the draw_image args)
// part_rect is the size and position (in absolute pixels in the image) of the wanted part
// eg. On a 600*600 context, to display only the first 400*400 pixels of a 2000*2000 image
// on the entire context surface, call :
// draw_image_part(Rect{0, 0, 600, 600}, Rect{0, 0, 400, 400}, img)
pub fn (ctx &Context) draw_image_part(img_rect Rect, part_rect Rect, img_ &Image) {
ctx.draw_image_with_config(
img: img_
img_rect: img_rect
part_rect: part_rect
)
}
// draw_image draws the provided image onto the screen
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pub fn (ctx &Context) draw_image(x f32, y f32, width f32, height f32, img_ &Image) {
$if macos {
if img_.id >= ctx.image_cache.len {
eprintln('gg: draw_image() bad img id $img_.id (img cache len = $ctx.image_cache.len)')
return
}
if ctx.native_rendering {
if img_.width == 0 {
return
}
if !os.exists(img_.path) {
return
}
C.darwin_draw_image(x, ctx.height - (y + height), width, height, img_)
return
}
}
ctx.draw_image_with_config(
img: img_
img_rect: Rect{x, y, width, height}
part_rect: Rect{0, 0, img_.width, img_.height}
)
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}
// draw_image_flipped draws the provided image flipped horizontally (use `draw_image_with_config` to flip vertically)
pub fn (ctx &Context) draw_image_flipped(x f32, y f32, width f32, height f32, img_ &Image) {
ctx.draw_image_with_config(
flip_x: true
img: img_
img_rect: Rect{x, y, width, height}
)
}
// draw_image_by_id draws an image by its id
pub fn (ctx &Context) draw_image_by_id(x f32, y f32, width f32, height f32, id int) {
ctx.draw_image_with_config(
img_id: id
img_rect: Rect{x, y, width, height}
)
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}
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// draw_image_3d draws an image with a z depth
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pub fn (ctx &Context) draw_image_3d(x f32, y f32, z f32, width f32, height f32, img_ &Image) {
ctx.draw_image_with_config(
img: img_
img_rect: Rect{x, y, width, height}
z: z
)
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}