new gg/freetype modules with sokol/fontstash backends

vlib/gg2/gg.v

@@ -0,0 +1,216 @@
+// Copyright (c) 2019 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 gg2
+
+import (
+	glm
+	gx
+	os
+	sokol
+	sokol.sapp
+	sokol.sgl
+	sokol.gfx
+	sokol.sfons
+)
+const (
+	default_font_size = 24
+)
+
+pub struct Config {
+pub:
+	width         int
+	height        int
+	use_ortho     bool
+	retina        bool
+	resizable     bool
+	user_data     voidptr
+	font_size     int
+	font_path     string
+	create_window bool
+	// window_user_ptr voidptr
+	window_title  string
+	always_on_top bool
+	scale         int
+	frame_fn      fn(voidptr)
+	bg_color      gx.Color
+}
+
+pub struct GG {
+	scale      int // retina = 2 , normal = 1
+pub mut:
+	width      int
+	height     int
+	clear_pass C.sg_pass_action
+	window     C.sapp_desc
+	render_fn  fn()
+	//////////// font fields
+	fons &C.FONScontext
+	font_normal int
+}
+
+// TODO remove globals
+__global g_fons &C.FONScontext
+__global g_font_normal int
+__global g_font_path string
+
+fn init_sokol_window() {
+	desc := sg_desc{
+		mtl_device: C.sapp_metal_get_device()
+		mtl_renderpass_descriptor_cb: sapp_metal_get_renderpass_descriptor
+		mtl_drawable_cb: sapp_metal_get_drawable
+		d3d11_device: sapp_d3d11_get_device()
+		d3d11_device_context: sapp_d3d11_get_device_context()
+		d3d11_render_target_view_cb: sapp_d3d11_get_render_target_view
+		d3d11_depth_stencil_view_cb: sapp_d3d11_get_depth_stencil_view
+	}
+	gfx.setup(&desc)
+	sgl_desc := sgl_desc_t{}
+	sgl.setup(&sgl_desc)
+	g_fons = sfons.create(512, 512, 1)
+	if g_font_path.len == 0 || !os.exists(g_font_path) {
+		println('failed to load font "$g_font_path"')
+		return
+	}
+	bytes := os.read_bytes(g_font_path) or {
+		println('failed to load font "$g_font_path"')
+		return
+	}
+	g_font_normal = C.fonsAddFontMem(g_fons, 'sans', bytes.data, bytes.len, false)
+}
+
+pub fn new_context(cfg Config) &GG {
+	//C.printf('new_context() %p\n', cfg.user_data)
+	window := sapp_desc{
+		user_data: cfg.user_data
+		init_userdata_cb: init_sokol_window
+		frame_userdata_cb: cfg.frame_fn
+		window_title: cfg.window_title.str
+		html5_canvas_name: cfg.window_title.str
+		width: cfg.width
+		height: cfg.height
+		high_dpi: true
+	}
+	g_font_path = cfg.font_path
+	if cfg.use_ortho {}
+	else {}
+	return &GG{
+		width: cfg.width
+		height: cfg.height
+		window: window
+		clear_pass: gfx.create_clear_pass(f32(cfg.bg_color.r) / 255.0, f32(cfg.bg_color.g) / 255.0, f32(cfg.bg_color.b) / 255.0, 1.0)
+		scale: 1 // scale
+		fons:0
+	}
+}
+
+pub fn (gg &GG) draw_text(x, y int, text string, cfg gx.TextCfg) {
+	gg.fons.set_font(gg.font_normal)
+	gg.fons.set_size(cfg.size)
+	ascender := 0.0
+	descender := 0.0
+	lh := 0.0
+	gg.fons.vert_metrics(&ascender, &descender, &lh)
+	color:= C.sfons_rgba(cfg.color.r, cfg.color.g, cfg.color.b, 255)
+	C.fonsSetColor(gg.fons, color)
+	C.fonsDrawText(gg.fons, x, y, text.str, 0)
+}
+
+pub fn (ctx &GG) draw_text_def(x, y int, text string) {
+	cfg := gx.TextCfg {
+		color: gx.Black
+		size: default_font_size
+		align: gx.ALIGN_LEFT
+	}
+	ctx.draw_text(x, y, text, cfg)
+}
+
+pub fn (gg mut GG) init_font() {
+	// TODO
+	gg.fons =g_fons
+	gg.font_normal=g_font_normal
+}
+
+pub fn (gg &GG) run() {
+	sapp.run(&gg.window)
+}
+
+pub fn (ctx &GG) draw_rect(x, y, w, h f32, c gx.Color) {
+	sgl.c4b(c.r, c.g, c.b, 128)
+	sgl.begin_quads()
+	sgl_v2f(x, y)
+	sgl_v2f(x + w, y)
+	sgl_v2f(x + w, y + h)
+	sgl_v2f(x, y + h)
+	sgl.end()
+}
+
+pub fn draw_rect(x, y, w, h f32, c gx.Color) {
+	sgl.c4b(c.r, c.g, c.b, 128)
+	sgl.begin_quads()
+	sgl_v2f(x, y)
+	sgl_v2f(x + w, y)
+	sgl_v2f(x + w, y + h)
+	sgl_v2f(x, y + h)
+	sgl.end()
+}
+
+pub fn (gg &GG) draw_empty_rect(x, y, w, h f32, c gx.Color) {
+	sgl.c4b(c.r, c.g, c.b, 128)
+	sgl.begin_line_strip()
+	sgl.v2f(x, y)
+	sgl.v2f(x + w, y)
+	sgl.v2f(x + w, y + h)
+	sgl.v2f(x, y + h)
+	sgl.v2f(x, y)
+	sgl.end()
+}
+
+pub fn create_image(file string) u32 {
+	// println('gg create image "$file"')
+	if !os.exists(file) {
+		println('gg create image no such file "$file"')
+		return u32(0)
+	}
+	// img := stbi.load(file)
+	// img.free()
+	return 0 // texture
+}
+
+pub fn create_image_from_memory(buf byteptr) u32 {
+	// texture := gl.gen_texture()
+	// img := stbi.load_from_memory(buf)
+	// img.free()
+	return 0 // texture
+}
+
+pub fn (gg &GG) begin() {
+	sgl.defaults()
+	sgl.matrix_mode_projection()
+	sgl.ortho(0.0, f32(sapp.width()), f32(sapp.height()), 0.0, -1.0, 1.0)
+}
+
+pub fn (gg &GG) end() {
+	gfx.begin_default_pass(gg.clear_pass, sapp.width(), sapp.height())
+	sgl.draw()
+	gfx.end_pass()
+	gfx.commit()
+	wait_events()
+}
+
+pub fn (ctx &GG) draw_line(x, y, x2, y2 f32, color gx.Color) {}
+
+pub fn wait_events() {
+	unsafe {
+		$if macos  {
+		# NSEvent *event = [NSApp nextEventMatchingMask:NSEventMaskAny
+		# untilDate:[NSDate distantFuture]
+		# inMode:NSDefaultRunLoopMode
+		# dequeue:YES];
+		# [NSApp sendEvent:event];
+		}
+		$if windows {
+			C.WaitMessage()
+		}
+	}
+}