235 lines
5.8 KiB
V
235 lines
5.8 KiB
V
module ttf
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/**********************************************************************
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*
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* BMP render module utility functions
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*
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* Copyright (c) 2021 Dario Deledda. All rights reserved.
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* Use of this source code is governed by an MIT license
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* that can be found in the LICENSE file.
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*
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* Note:
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*
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* TODO:
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**********************************************************************/
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import math
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import gg
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import sokol.sgl
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pub
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struct TTF_render_Sokol {
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pub mut:
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bmp &BitMap // Base bitmap render
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// rendering fields
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sg_img C.sg_image // sokol image
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scale_reduct f32 = 2.0 // scale of the cpu texture for filtering
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device_dpi int = 72 // device DPI
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}
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/******************************************************************************
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*
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* Render functions
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*
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******************************************************************************/
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fn (mut tf_skl TTF_render_Sokol) format_texture(){
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r := byte(tf_skl.bmp.color >> 24)
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g := byte((tf_skl.bmp.color >> 16) & 0xFF)
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b := byte((tf_skl.bmp.color >> 8 ) & 0xFF)
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a := byte(tf_skl.bmp.color & 0xFF)
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b_r := byte(tf_skl.bmp.bg_color >> 24)
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b_g := byte((tf_skl.bmp.bg_color >> 16) & 0xFF)
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b_b := byte((tf_skl.bmp.bg_color >> 8 ) & 0xFF)
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b_a := byte(tf_skl.bmp.bg_color & 0xFF)
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// trasform buffer in a texture
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x := byteptr(tf_skl.bmp.buf)
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unsafe{
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mut i := 0
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for i<tf_skl.bmp.buf_size {
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data := x[i]
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if data > 0 {
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x[i+0] = r
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x[i+1] = g
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x[i+2] = b
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// alpha
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x[i+3] = byte((a * data) >> 8)
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} else {
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x[i+0] = b_r
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x[i+1] = b_g
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x[i+2] = b_b
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x[i+3] = b_a
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}
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i += 4
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}
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}
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}
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pub
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fn (mut tf_skl TTF_render_Sokol) create_text(in_txt string, in_font_size f32){
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scale_reduct := tf_skl.scale_reduct
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device_dpi := tf_skl.device_dpi
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font_size := in_font_size //* scale_reduct
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// Formula: (font_size * device dpi) / (72dpi * em_unit)
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//scale := ((1.0 * devide_dpi )/ f32(72 * tf_skl.bmp.tf.units_per_em))* font_size
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scale := f32(font_size * device_dpi) / f32(72 * tf_skl.bmp.tf.units_per_em)
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//dprintln("Scale: $scale")
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tf_skl.bmp.scale = scale * scale_reduct
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w, h := tf_skl.bmp.get_bbox(in_txt)
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tf_skl.bmp.width = int(w)
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tf_skl.bmp.height = int((h+8))
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sz := tf_skl.bmp.width * tf_skl.bmp.height * tf_skl.bmp.bp
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// RAM buffer
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if sz > tf_skl.bmp.buf_size {
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if sz > 0 {
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free(tf_skl.bmp.buf)
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}
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dprintln("create_text Alloc: $sz bytes")
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tf_skl.bmp.buf = malloc(sz)
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tf_skl.bmp.buf_size = sz
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}
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tf_skl.bmp.init_filler()
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// draw the text
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mut y_base := int((tf_skl.bmp.tf.y_max - tf_skl.bmp.tf.y_min) * tf_skl.bmp.scale)
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tf_skl.bmp.set_pos(0,y_base)
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tf_skl.bmp.clear()
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tf_skl.bmp.draw_text(in_txt)
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tf_skl.format_texture()
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}
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pub
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fn (mut tf_skl TTF_render_Sokol) create_text_block(in_txt string, in_w int, in_h int, in_font_size f32){
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scale_reduct := tf_skl.scale_reduct
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device_dpi := tf_skl.device_dpi
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font_size := in_font_size //* scale_reduct
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// Formula: (font_size * device dpi) / (72dpi * em_unit)
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//scale := ((1.0 * devide_dpi )/ f32(72 * tf_skl.bmp.tf.units_per_em))* font_size
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scale := f32(font_size * device_dpi) / f32(72 * tf_skl.bmp.tf.units_per_em)
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//dprintln("Scale: $scale")
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tf_skl.bmp.scale = scale * scale_reduct
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w := in_w
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h := in_h
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tf_skl.bmp.width = int(w * scale_reduct + 0.5)
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tf_skl.bmp.height = int((h+2) * scale_reduct + 0.5)
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sz := tf_skl.bmp.width * tf_skl.bmp.height * tf_skl.bmp.bp
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//if true { return }
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// RAM buffer
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if sz > tf_skl.bmp.buf_size {
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if sz > 0 {
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free(tf_skl.bmp.buf)
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}
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dprintln("Alloc: $sz bytes")
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tf_skl.bmp.buf = malloc(sz)
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tf_skl.bmp.buf_size = sz
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}
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tf_skl.bmp.init_filler()
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// draw the text
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mut y_base := int((tf_skl.bmp.tf.y_max - tf_skl.bmp.tf.y_min) * tf_skl.bmp.scale)
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tf_skl.bmp.set_pos(0,y_base)
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tf_skl.bmp.clear()
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tf_skl.bmp.draw_text_block(in_txt, {x: 0, y:0, w:w, h:h})
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tf_skl.format_texture()
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}
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/******************************************************************************
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*
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* Sokol Render functions
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*
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******************************************************************************/
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pub
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fn (mut tf_skl TTF_render_Sokol) create_texture(){
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w := tf_skl.bmp.width
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h := tf_skl.bmp.height
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sz := tf_skl.bmp.width * tf_skl.bmp.height * tf_skl.bmp.bp
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mut img_desc := C.sg_image_desc{
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width: w
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height: h
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num_mipmaps: 0
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min_filter: .linear
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mag_filter: .linear
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//usage: .dynamic
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wrap_u: .clamp_to_edge
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wrap_v: .clamp_to_edge
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label: &byte(0)
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d3d11_texture: 0
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}
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// comment for dynamic
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img_desc.content.subimage[0][0] = C.sg_subimage_content{
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ptr: tf_skl.bmp.buf
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size: sz
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}
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simg := C.sg_make_image(&img_desc)
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//free(tf_skl.bmp.buf) // DONT FREE IF Dynamic
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tf_skl.sg_img = simg
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}
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pub
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fn (tf_skl TTF_render_Sokol) destroy_texture(){
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C.sg_destroy_image(tf_skl.sg_img)
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}
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// Use only if usage: .dynamic
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pub
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fn (mut tf_skl TTF_render_Sokol) update_text_texture(){
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sz := tf_skl.bmp.width * tf_skl.bmp.height * tf_skl.bmp.bp
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mut tmp_sbc := C.sg_image_content{}
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tmp_sbc.subimage[0][0] = C.sg_subimage_content {
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ptr: tf_skl.bmp.buf
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size: sz
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}
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C.sg_update_image(tf_skl.sg_img, &tmp_sbc)
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}
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pub
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fn (tf_skl TTF_render_Sokol) draw_text_bmp(ctx &gg.Context, x f32, y f32) {
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//width := tf_skl.bmp.width >> 1
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//height := tf_skl.bmp.height >> 1
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sgl.push_matrix()
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width := tf_skl.bmp.width / (tf_skl.scale_reduct)
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height := tf_skl.bmp.height / (tf_skl.scale_reduct)
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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(0)
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y0 := f32(0)
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x1 := f32(width) * ctx.scale
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y1 := f32(height) * ctx.scale
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ca := f32(math.cos(tf_skl.bmp.angle))
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sa := f32(math.sin(tf_skl.bmp.angle))
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m := [
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f32(ca),-sa,0,0,
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sa,ca,0,0,
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0,0,1,0,
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x,y,0,1
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]
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sgl.mult_matrix(m)
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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(tf_skl.sg_img)
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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.end()
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sgl.disable_texture()
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sgl.pop_matrix()
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}
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