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[core] Fix aliased text on mobile GPUs

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Need highp precision for gamma values on mobile devices. lowp triggers aliasing artifacts at larger font sizes.

Note that this change is a hand-edit to the generated shader sources, rather than pulling https://github.com/mapbox/mapbox-gl-js/pull/4275 and running the generator script. The reason for that is that the upstream shader now assumes support for DDS properties that gl-native does not yet support. Once that support lands in gl-native, we can regenerate the shader source.
This commit is contained in:
John Firebaugh
2017-02-14 16:26:01 -08:00
parent f030da5ccd
commit 8f1c580ea1
1 changed files with 3 additions and 3 deletions
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6
src/mbgl/shaders/symbol_sdf.cpp
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@@ -168,7 +168,7 @@ uniform sampler2D u_fadetexture;
uniform lowp vec4 u_color;
uniform lowp float u_opacity;
uniform lowp float u_buffer;
uniform lowp float u_gamma;
uniform highp float u_gamma;
varying vec2 v_tex;
varying vec2 v_fade_tex;
@@ -177,8 +177,8 @@ varying float v_gamma_scale;
void main() {
lowp float dist = texture2D(u_texture, v_tex).a;
lowp float fade_alpha = texture2D(u_fadetexture, v_fade_tex).a;
lowp float gamma = u_gamma * v_gamma_scale;
lowp float alpha = smoothstep(u_buffer - gamma, u_buffer + gamma, dist) * fade_alpha;
highp float gamma = u_gamma * v_gamma_scale;
highp float alpha = smoothstep(u_buffer - gamma, u_buffer + gamma, dist) * fade_alpha;
gl_FragColor = u_color * (alpha * u_opacity);