224 lines
6.1 KiB
V
224 lines
6.1 KiB
V
// 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.
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module gg
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// import sokol.sapp
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import gx
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import sokol.gfx
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import os
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import sokol
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import sokol.sgl
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import stbi
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[heap]
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pub struct Image {
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pub mut:
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id int
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width int
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height int
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nr_channels int
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ok bool
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data voidptr
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ext string
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simg_ok bool
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simg C.sg_image
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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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rotate int // amount to rotate the image in degrees
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z f32
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color gx.Color = gx.white
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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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y f32
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width f32
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height f32
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}
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// TODO remove this
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fn create_image(file string) Image {
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if !os.exists(file) {
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println('gg.create_image(): file not found: $file')
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return Image{} // none
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}
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stb_img := stbi.load(file) or { return Image{} }
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mut img := Image{
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width: stb_img.width
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height: stb_img.height
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nr_channels: stb_img.nr_channels
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ok: stb_img.ok
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data: stb_img.data
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ext: stb_img.ext
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path: file
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}
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img.init_sokol_image()
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return img
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}
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pub fn (mut ctx Context) create_image_from_memory(buf &byte, bufsize int) Image {
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stb_img := stbi.load_from_memory(buf, bufsize) or { return Image{} }
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mut img := Image{
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width: stb_img.width
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height: stb_img.height
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nr_channels: stb_img.nr_channels
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ok: stb_img.ok
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data: stb_img.data
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ext: stb_img.ext
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id: ctx.image_cache.len
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}
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ctx.image_cache << img
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return img
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}
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pub fn (mut ctx Context) create_image_from_byte_array(b []byte) Image {
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return ctx.create_image_from_memory(b.data, b.len)
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}
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pub fn (mut ctx Context) cache_image(img Image) int {
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ctx.image_cache << img
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image_idx := ctx.image_cache.len - 1
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ctx.image_cache[image_idx].id = image_idx
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return image_idx
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}
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pub fn (mut ctx Context) get_cached_image_by_idx(image_idx int) &Image {
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return &ctx.image_cache[image_idx]
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}
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pub struct StreamingImageConfig {
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pixel_format gfx.PixelFormat = .rgba8
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wrap_u gfx.Wrap = .clamp_to_edge
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wrap_v gfx.Wrap = .clamp_to_edge
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min_filter gfx.Filter = .linear
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mag_filter gfx.Filter = .linear
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num_mipmaps int = 1
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num_slices int = 1
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}
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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[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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v1 := (part_rect.y + part_rect.height) / img.height
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x0 := img_rect.x * ctx.scale
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y0 := img_rect.y * ctx.scale
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x1 := (img_rect.x + img_rect.width) * ctx.scale
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mut y1 := (img_rect.y + img_rect.height) * ctx.scale
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if img_rect.height == 0 {
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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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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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if config.rotate != 0 {
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width := img_rect.width * ctx.scale
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height := (if img_rect.height > 0 { img_rect.height } else { img.height }) * ctx.scale
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sgl.push_matrix()
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sgl.translate(x0 + (width / 2), y0 + (height / 2), 0)
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sgl.rotate(sgl.rad(-config.rotate), 0, 0, 1)
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sgl.translate(-x0 - (width / 2), -y0 - (height / 2), 0)
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}
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sgl.begin_quads()
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sgl.c4b(config.color.r, config.color.g, config.color.b, config.color.a)
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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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if config.rotate != 0 {
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sgl.pop_matrix()
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}
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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_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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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 by its 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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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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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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