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label supports sdf

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This commit is contained in:
Pinchuk Aleksei
2019-08-06 19:39:04 +03:00
parent 52252187b5
commit 98fa28e521
4 changed files with 165 additions and 9 deletions
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24
samples/bin/library/sdf_shader.frag
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@@ -1,14 +1,24 @@
uniform sampler2D u_texture;
uniform lowp float u_smoothing;
uniform lowp float u_outline_distance;// Between 0 and 0.5, 0 = thick outline, 0.5 = no outline
uniform lowp float u_shadow_smoothing;// Between 0 and 0.5
uniform lowp vec2 u_shadow_offset; // Between 0 and spread / texture_size
uniform lowp vec4 u_shadow_color;
uniform lowp vec4 u_outline_color;
varying vec2 v_st0;
varying vec4 v_color;
const float smoothing = 1.0 / 16.0;
void main() {
vec2 st = vec2(v_st0.s, 1.0 - v_st0.t);
gl_FragColor = texture2D(u_texture, st) * v_color;
float distance = texture2D(u_texture, st).a;
float alpha = smoothstep(0.5 - smoothing, 0.5 + smoothing, distance);
gl_FragColor = vec4(v_color.rgb, v_color.a * alpha);
lowp vec2 st = vec2(v_st0.s, 1.0 - v_st0.t);
lowp float distance = texture2D(u_texture, st).a;
lowp float outline_factor = smoothstep(0.5 - u_smoothing, 0.5 + u_smoothing, distance);
lowp vec4 color = mix(u_outline_color, v_color, outline_factor);
lowp float alpha = smoothstep(u_outline_distance - u_smoothing, u_outline_distance + u_smoothing, distance);
lowp vec4 text = vec4(color.rgb, color.a * alpha);
lowp float shadow_distance = texture2D(u_texture, st - u_shadow_offset).a;
lowp float shadow_alpha = smoothstep(0.5 - u_shadow_smoothing, 0.5 + u_shadow_smoothing, shadow_distance);
lowp vec4 shadow = vec4(u_shadow_color.rgb, u_shadow_color.a * shadow_alpha);
gl_FragColor = mix(shadow, text, text.a);
}