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Render text "shadows", once again till++ forced me to do it.

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IntegratedQuantum 2023-04-04 16:17:39 +02:00
parent 60f0c5d3af
commit 9dee31ccbe
1 changed files with 68 additions and 0 deletions
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68
src/graphics.zig
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@ -741,6 +741,7 @@ pub const TextBuffer = struct {
}
pub fn render(self: TextBuffer, _x: f32, _y: f32, _fontSize: f32) !void {
try self.renderShadow(_x, _y, _fontSize);
const oldTranslation = draw.setTranslation(.{_x, _y});
defer draw.restoreTranslation(oldTranslation);
const oldScale = draw.setScale(_fontSize/16.0);
@ -792,6 +793,73 @@ pub const TextBuffer = struct {
}
}
}
fn shadowColor(color: u24) u24 {
const r = @intToFloat(f32, color >> 16);
const g = @intToFloat(f32, color >> 8 & 255);
const b = @intToFloat(f32, color & 255);
const perceivedBrightness = @sqrt(0.299*r*r + 0.587*g*g + 0.114*b*b);
if(perceivedBrightness < 64) {
return 0xffffff; // Make shadows white for better readability.
} else {
return 0;
}
}
fn renderShadow(self: TextBuffer, _x: f32, _y: f32, _fontSize: f32) !void { // Basically a copy of render with some color and position changes.
const oldTranslation = draw.setTranslation(.{_x + _fontSize/16.0, _y + _fontSize/16.0});
defer draw.restoreTranslation(oldTranslation);
const oldScale = draw.setScale(_fontSize/16.0);
defer draw.restoreScale(oldScale);
var x: f32 = 0;
var y: f32 = 0;
TextRendering.shader.bind();
c.glUniform2f(TextRendering.uniforms.scene, @intToFloat(f32, main.Window.width), @intToFloat(f32, main.Window.height));
c.glUniform1f(TextRendering.uniforms.ratio, draw.scale);
c.glUniform1f(TextRendering.uniforms.alpha, @intToFloat(f32, draw.color >> 24) / 255.0);
c.glActiveTexture(c.GL_TEXTURE0);
c.glBindTexture(c.GL_TEXTURE_2D, TextRendering.glyphTexture[0]);
c.glBindVertexArray(draw.rectVAO);
const lineWraps: []f32 = try main.threadAllocator.alloc(f32, self.lineBreaks.items.len - 1);
defer main.threadAllocator.free(lineWraps);
var i: usize = 0;
while(i < self.lineBreaks.items.len - 1) : (i += 1) {
x = self.getLineOffset(i);
for(self.glyphs[self.lineBreaks.items[i].index..self.lineBreaks.items[i+1].index]) |glyph| {
if(glyph.character != '\n') {
const ftGlyph = try TextRendering.getGlyph(glyph.index);
var fontEffect = glyph.fontEffect;
fontEffect.color = shadowColor(fontEffect.color);
TextRendering.drawGlyph(ftGlyph, x + glyph.x_offset, y - glyph.y_offset, @bitCast(u28, fontEffect));
}
x += glyph.x_advance;
y -= glyph.y_advance;
}
lineWraps[i] = x - self.getLineOffset(i);
x = 0;
y += 16;
}
for(self.lines.items) |_line| {
var line: Line = _line;
y = 0;
if(line.isUnderline) y += 15
else y += 8;
draw.setColor(shadowColor(line.color) | (@as(u32, 0xff000000) & draw.color));
for(lineWraps, 0..) |lineWrap, j| {
const lineStart = @max(0, line.start);
const lineEnd = @min(lineWrap, line.end);
if(lineStart < lineEnd) {
var start = Vec2f{lineStart + self.getLineOffset(j), y};
const dim = Vec2f{lineEnd - lineStart, 1};
draw.rect(start, dim);
}
line.start -= lineWrap;
line.end -= lineWrap;
y += 16;
}
}
}
};
const TextRendering = struct {