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gg: add new draw_image_with_config method (#10428)
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KJ Lawrence
GitHub
parent
7201d5db59
commit
b0caadae31
157
vlib/gg/image.v
157
vlib/gg/image.v
@ -25,6 +25,19 @@ pub mut:
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path string
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}
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// DrawImageConfig struct defines the various options
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// that can be used to draw an image onto the screen
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pub struct DrawImageConfig {
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pub:
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flip_x bool
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flip_y bool
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img &Image = voidptr(0)
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img_id int
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img_rect Rect // defines the size and position on image when rendering to the screen
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part_rect Rect // defines the size and position of part of the image to use when rendering
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z f32
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}
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pub struct Rect {
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pub:
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x f32
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@ -160,22 +173,30 @@ pub fn (mut img Image) init_sokol_image() &Image {
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return img
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}
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// Draw part of an image using uv coordinates
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// img_rect is the size and position (in pixels on screen) of the displayed rectangle (ie the draw_image args)
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// part_rect is the size and position (in absolute pixels in the image) of the wanted part
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// eg. On a 600*600 context, to display only the first 400*400 pixels of a 2000*2000 image
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// on the entire context surface, call :
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// draw_image_part(Rect{0, 0, 600, 600}, Rect{0, 0, 400, 400}, img)
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pub fn (ctx &Context) draw_image_part(img_rect Rect, part_rect Rect, img_ &Image) {
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if img_.id >= ctx.image_cache.len {
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eprintln('gg: draw_image() bad img id $img_.id (img cache len = $ctx.image_cache.len)')
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// draw_image_with_config takes in a config that details how the
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// provided image should be drawn onto the screen
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pub fn (ctx &Context) draw_image_with_config(config DrawImageConfig) {
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id := if !isnil(config.img) { config.img.id } else { config.img_id }
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if id >= ctx.image_cache.len {
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eprintln('gg: draw_image() bad img id $id (img cache len = $ctx.image_cache.len)')
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return
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}
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img := ctx.image_cache[img_.id] // fetch the image from cache
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img := ctx.image_cache[id]
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if !img.simg_ok {
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return
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}
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mut img_rect := config.img_rect
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if img_rect.width == 0 && img_rect.height == 0 {
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img_rect = Rect{img_rect.x, img_rect.y, img.width, img.height}
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}
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mut part_rect := config.part_rect
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if part_rect.width == 0 && part_rect.height == 0 {
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part_rect = Rect{part_rect.x, part_rect.y, img.width, img.height}
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}
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u0 := part_rect.x / img.width
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v0 := part_rect.y / img.height
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u1 := (part_rect.x + part_rect.width) / img.width
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@ -188,20 +209,43 @@ pub fn (ctx &Context) draw_image_part(img_rect Rect, part_rect Rect, img_ &Image
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scale := f32(img.width) / f32(img_rect.width)
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y1 = f32(img_rect.y + int(f32(img.height) / scale)) * ctx.scale
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}
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//
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flip_x := config.flip_x
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flip_y := config.flip_y
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mut u0f := if !flip_x { u0 } else { u1 }
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mut u1f := if !flip_x { u1 } else { u0 }
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mut v0f := if !flip_y { v0 } else { v1 }
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mut v1f := if !flip_y { v1 } else { v0 }
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sgl.load_pipeline(ctx.timage_pip)
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sgl.enable_texture()
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sgl.texture(img.simg)
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sgl.begin_quads()
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sgl.c4b(255, 255, 255, 255)
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sgl.v2f_t2f(x0, y0, u0, v0)
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sgl.v2f_t2f(x1, y0, u1, v0)
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sgl.v2f_t2f(x1, y1, u1, v1)
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sgl.v2f_t2f(x0, y1, u0, v1)
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sgl.v3f_t2f(x0, y0, config.z, u0f, v0f)
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sgl.v3f_t2f(x1, y0, config.z, u1f, v0f)
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sgl.v3f_t2f(x1, y1, config.z, u1f, v1f)
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sgl.v3f_t2f(x0, y1, config.z, u0f, v1f)
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sgl.end()
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sgl.disable_texture()
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}
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// Draw part of an image using uv coordinates
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// img_rect is the size and position (in pixels on screen) of the displayed rectangle (ie the draw_image args)
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// part_rect is the size and position (in absolute pixels in the image) of the wanted part
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// eg. On a 600*600 context, to display only the first 400*400 pixels of a 2000*2000 image
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// on the entire context surface, call :
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// draw_image_part(Rect{0, 0, 600, 600}, Rect{0, 0, 400, 400}, img)
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pub fn (ctx &Context) draw_image_part(img_rect Rect, part_rect Rect, img_ &Image) {
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ctx.draw_image_with_config(
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img: img_
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img_rect: img_rect
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part_rect: part_rect
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)
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}
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// 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) {
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$if macos {
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if img_.id >= ctx.image_cache.len {
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@ -220,74 +264,35 @@ pub fn (ctx &Context) draw_image(x f32, y f32, width f32, height f32, img_ &Imag
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}
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}
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ctx.draw_image_part(Rect{x, y, width, height}, Rect{0, 0, img_.width, img_.height},
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img_)
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ctx.draw_image_with_config(
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img: img_
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img_rect: Rect{x, y, width, height}
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part_rect: Rect{0, 0, img_.width, img_.height}
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)
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}
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// TODO remove copy pasta, merge the functions
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// draw_image_flipped draws the provided image flipped horizontally (use `draw_image_with_config` to flip vertically)
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pub fn (ctx &Context) draw_image_flipped(x f32, y f32, width f32, height f32, img_ &Image) {
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if img_.id >= ctx.image_cache.len {
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eprintln('gg: draw_image_flipped() bad img id $img_.id (img cache len = $ctx.image_cache.len)')
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return
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}
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img := ctx.image_cache[img_.id] // fetch the image from cache
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if !img.simg_ok {
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return
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}
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u0 := f32(0.0)
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v0 := f32(0.0)
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u1 := f32(1.0)
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v1 := f32(1.0)
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x0 := f32(x) * ctx.scale
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y0 := f32(y) * ctx.scale
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x1 := f32(x + width) * ctx.scale
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y1 := f32(y + height) * ctx.scale
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//
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sgl.load_pipeline(ctx.timage_pip)
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sgl.enable_texture()
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sgl.texture(img.simg)
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sgl.begin_quads()
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sgl.c4b(255, 255, 255, 255)
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sgl.v2f_t2f(x0, y0, u1, v0)
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sgl.v2f_t2f(x1, y0, u0, v0)
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sgl.v2f_t2f(x1, y1, u0, v1)
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sgl.v2f_t2f(x0, y1, u1, v1)
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sgl.end()
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sgl.disable_texture()
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ctx.draw_image_with_config(
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flip_x: true
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img: img_
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img_rect: Rect{x, y, width, height}
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)
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}
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// draw_image_by_id draws an image based by an id
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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]
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ctx.draw_image(x, y, width, height, img)
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ctx.draw_image_with_config(
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img_id: id
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img_rect: Rect{x, y, width, height}
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)
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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) {
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if img_.id >= ctx.image_cache.len {
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eprintln('gg: draw_image_3d() bad img id $img_.id (img cache len = $ctx.image_cache.len)')
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return
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}
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img := ctx.image_cache[img_.id] // fetch the image from cache
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if !img.simg_ok {
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return
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}
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u0 := f32(0.0)
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v0 := f32(0.0)
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u1 := f32(1.0)
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v1 := f32(1.0)
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x0 := f32(x) * ctx.scale
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y0 := f32(y) * ctx.scale
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x1 := f32(x + width) * ctx.scale
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y1 := f32(y + height) * ctx.scale
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//
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sgl.load_pipeline(ctx.timage_pip)
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sgl.enable_texture()
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sgl.texture(img.simg)
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sgl.begin_quads()
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sgl.c4b(255, 255, 255, 255)
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sgl.v3f_t2f(x0, y0, z, u0, v0)
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sgl.v3f_t2f(x1, y0, z, u1, v0)
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sgl.v3f_t2f(x1, y1, z, u1, v1)
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sgl.v3f_t2f(x0, y1, z, u0, v1)
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sgl.end()
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sgl.disable_texture()
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ctx.draw_image_with_config(
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img: img_
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img_rect: Rect{x, y, width, height}
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z: z
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)
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}
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