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Use texelFetch+debug grid in atlas

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This commit is contained in:
bloeys
2022-07-06 17:53:55 +04:00
parent afcd514f98
commit d23e833b54
4 changed files with 47 additions and 13 deletions
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47
glyphs/font_atlas.go
View File

@ -3,6 +3,7 @@ package glyphs
import (
"errors"
"image"
"image/color"
"image/draw"
"image/png"
"math"
@ -118,7 +119,7 @@ func NewFontAtlasFromFont(f *truetype.Font, face font.Face, pointSize uint) (*Fo
}
//Create atlas
atlasSizeXF32 := float32(atlasSizeX)
// atlasSizeXF32 := float32(atlasSizeX)
atlasSizeYF32 := float32(atlasSizeY)
atlas := &FontAtlas{
Font: f,
@ -127,7 +128,8 @@ func NewFontAtlasFromFont(f *truetype.Font, face font.Face, pointSize uint) (*Fo
Advance: charAdv - charPaddingX,
LineHeight: lineHeight,
SizeUV: *gglm.NewVec2(float32(charAdv-charPaddingX)/atlasSizeXF32, float32(lineHeight)/atlasSizeYF32),
SizeUV: *gglm.NewVec2(float32(charAdv-charPaddingX), float32(lineHeight)),
// SizeUV: *gglm.NewVec2(float32(charAdv-charPaddingX)/atlasSizeXF32, float32(lineHeight)/atlasSizeYF32),
}
//Clear background to black
@ -144,6 +146,9 @@ func NewFontAtlasFromFont(f *truetype.Font, face font.Face, pointSize uint) (*Fo
charsOnLine := 0
drawer.Dot = fixed.P(atlas.Advance+charPaddingX, lineHeight)
drawHorizontalLines := true
drawVerticalLines := true
for _, g := range glyphs {
gBounds, _, _ := face.GlyphBounds(g)
@ -152,8 +157,10 @@ func NewFontAtlasFromFont(f *truetype.Font, face font.Face, pointSize uint) (*Fo
bearingX := absFixedI26_6(gBounds.Min.X)
atlas.Glyphs[g] = FontAtlasGlyph{
U: float32((drawer.Dot.X).Floor()) / atlasSizeXF32,
V: (atlasSizeYF32 - float32((drawer.Dot.Y).Ceil())) / atlasSizeYF32,
U: float32((drawer.Dot.X).Floor()),
V: (atlasSizeYF32 - float32((drawer.Dot.Y).Ceil())),
// U: float32((drawer.Dot.X).Floor()) / atlasSizeXF32,
// V: (atlasSizeYF32 - float32((drawer.Dot.Y).Ceil())) / atlasSizeYF32,
Ascent: float32(ascent.Ceil()),
Descent: float32(descent.Ceil()),
@ -162,20 +169,48 @@ func NewFontAtlasFromFont(f *truetype.Font, face font.Face, pointSize uint) (*Fo
//Get glyph to draw but undo any applied descent so that the glyph is drawn sitting on the line exactly.
//Bearing will be applied correctly but descent will be the responsibility of the positioning code
imgRect, mask, maskp, gAdvanceFixed, _ := face.Glyph(drawer.Dot, g)
imgRect, mask, maskp, _, _ := face.Glyph(drawer.Dot, g)
if imgRect.Max.Y > drawer.Dot.Y.Ceil() {
diff := imgRect.Max.Y - drawer.Dot.Y.Ceil()
imgRect.Min.Y -= diff
imgRect.Max.Y -= diff
}
if drawVerticalLines {
rectCopy := imgRect
rectCopy.Min.Y = 0
rectCopy.Max.Y = drawer.Dst.Bounds().Max.Y
rectCopy.Max.X = rectCopy.Min.X + 1
oldPos := drawer.Dot
drawer.Dot.Y = 0
// fmt.Printf("Drawing with maskP %s\n", maskp.String())
draw.Draw(drawer.Dst, rectCopy, image.NewUniform(color.NRGBA{G: 255, A: 255}), image.Point{}, draw.Over)
drawer.Dot = oldPos
}
//Draw glyph and advance dot
draw.DrawMask(drawer.Dst, imgRect, drawer.Src, image.Point{}, mask, maskp, draw.Over)
drawer.Dot.X += fixed.I(gAdvanceFixed.Ceil()) + charPaddingXFixed
drawer.Dot.X += fixed.I(atlas.Advance) + charPaddingXFixed
charsOnLine++
if charsOnLine == charsPerLine {
if drawHorizontalLines {
rectCopy := imgRect
rectCopy.Min.X = 0
rectCopy.Max.X = drawer.Dst.Bounds().Max.X
// rectCopy.Min.Y += (lineHeightFixed + charPaddingYFixed).Floor() * 1
rectCopy.Max.Y = rectCopy.Min.Y + 1
oldPos := drawer.Dot
drawer.Dot.X = 0
draw.Draw(drawer.Dst, rectCopy, image.NewUniform(color.NRGBA{G: 255, A: 255}), image.Point{}, draw.Over)
drawer.Dot = oldPos
drawVerticalLines = false
}
charsOnLine = 0
drawer.Dot.X = fixed.I(atlas.Advance) + charPaddingXFixed
drawer.Dot.Y += lineHeightFixed + charPaddingYFixed

4
glyphs/glyphs.go
View File

@ -137,8 +137,8 @@ func (gr *GlyphRend) DrawTextOpenGLAbs(text string, screenPos *gglm.Vec3, color
gr.GlyphVBO[buffIndex+5] = color.A()
//Model Pos
gr.GlyphVBO[buffIndex+6] = roundF32(drawPos.X())
gr.GlyphVBO[buffIndex+7] = roundF32(drawPos.Y())
gr.GlyphVBO[buffIndex+6] = drawPos.X()
gr.GlyphVBO[buffIndex+7] = drawPos.Y()
gr.GlyphVBO[buffIndex+8] = drawPos.Z()
//Model Scale

6
main.go
View File

@ -90,7 +90,7 @@ func (p *program) Init() {
fmt.Printf("DPI: %f, font size: %d\n", dpi, p.FontSize)
w, h := p.win.SDLWin.GetSize()
p.GlyphRend, err = glyphs.NewGlyphRend("./res/fonts/KawkabMono-Regular.ttf", &truetype.Options{Size: float64(p.FontSize), DPI: p.Dpi, SubPixelsX: subPixelX, SubPixelsY: subPixelY, Hinting: hinting}, w, h)
p.GlyphRend, err = glyphs.NewGlyphRend("./res/fonts/Consolas.ttf", &truetype.Options{Size: float64(p.FontSize), DPI: p.Dpi, SubPixelsX: subPixelX, SubPixelsY: subPixelY, Hinting: hinting}, w, h)
if err != nil {
panic("Failed to create atlas from font file. Err: " + err.Error())
}
@ -175,8 +175,6 @@ var b = rand.Float32()
func (p *program) Render() {
// println("Will profile with pprof...")
defer p.GlyphRend.Draw()
if p.shouldDrawGrid {
@ -201,7 +199,7 @@ func (p *program) Render() {
textColor := gglm.NewVec4(r, g, b, 1)
// str := "مرحبا بك my friend"
str := " hello there يا friend. أسمي عمر wow"
str := " hello there يا friend. سمي عمر wow"
// str := " ijojo\n\n Hello there, friend|. pq?\n ABCDEFG\tHIJKLMNOPQRSTUVWXYZ\nمرحبا بك"
// str := " ijojo\n\n Hello there, friend|. pq?\n ABCDEFG\tHIJKLMNOPQRSTUVWXYZ"

3
res/shaders/glyph.glsl
View File

@ -45,7 +45,8 @@ uniform sampler2D diffTex;
void main()
{
vec4 texColor = texture(diffTex, v2fUV0);
vec4 texColor = texelFetch(diffTex, ivec2(v2fUV0), 0);
// vec4 texColor = texture(diffTex, v2fUV0);
// if (texColor.r == 0)
// {
// fragColor = vec4(0,1,0,0.25);