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Diffstat (limited to 'v_windows/v/vlib/gg/image.v')
| -rw-r--r-- | v_windows/v/vlib/gg/image.v | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/v_windows/v/vlib/gg/image.v b/v_windows/v/vlib/gg/image.v new file mode 100644 index 0000000..e4c2776 --- /dev/null +++ b/v_windows/v/vlib/gg/image.v @@ -0,0 +1,223 @@ +// 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 + ) +} |