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// Copyright (c) 2019-2021 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 sokol.sapp
import gx
import sokol.gfx
import os
import sokol
import sokol.sgl
import stbi
[heap]
pub struct Image {
pub mut:
id int
width int
height int
nr_channels int
ok bool
data voidptr
ext string
simg_ok bool
simg C.sg_image
path string
}
// 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
color gx.Color = gx.white
}
pub struct Rect {
pub:
x f32
y f32
width f32
height f32
}
// TODO remove this
fn create_image(file string) Image {
if !os.exists(file) {
println('gg.create_image(): file not found: $file')
return Image{} // none
}
stb_img := stbi.load(file) or { return Image{} }
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
}
img.init_sokol_image()
return img
}
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{} }
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
}
ctx.image_cache << img
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)
}
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]
}
pub struct StreamingImageConfig {
pixel_format gfx.PixelFormat = .rgba8
wrap_u gfx.Wrap = .clamp_to_edge
wrap_v gfx.Wrap = .clamp_to_edge
min_filter gfx.Filter = .linear
mag_filter gfx.Filter = .linear
num_mipmaps int = 1
num_slices int = 1
}
// 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)')
return
}
img := ctx.image_cache[id]
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}
}
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 }
sgl.load_pipeline(ctx.timage_pip)
sgl.enable_texture()
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)
}
sgl.begin_quads()
sgl.c4b(config.color.r, config.color.g, config.color.b, config.color.a)
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)
sgl.end()
if config.rotate != 0 {
sgl.pop_matrix()
}
sgl.disable_texture()
}
// 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_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}
)
}
// draw_image_3d draws an image with a z depth
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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