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[core] Reduce number of varyings to 8 or less

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For #pragmas, don't generate varyings for attributes that aren't used by the fragment shader. Pack other varyings more tightly.
This commit is contained in:
John Firebaugh
2017-06-12 16:39:59 -07:00
parent 5a2dd1b5df
commit 31bf6719fc
6 changed files with 71 additions and 81 deletions
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6
src/mbgl/shaders/line_pattern.cpp
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@@ -44,16 +44,14 @@ attribute lowp vec2 a_opacity;
varying lowp float opacity;
uniform lowp float a_offset_t;
attribute lowp vec2 a_offset;
varying lowp float offset;
uniform lowp float a_gapwidth_t;
attribute mediump vec2 a_gapwidth;
varying mediump float gapwidth;
void main() {
blur = unpack_mix_vec2(a_blur, a_blur_t);
opacity = unpack_mix_vec2(a_opacity, a_opacity_t);
offset = unpack_mix_vec2(a_offset, a_offset_t);
gapwidth = unpack_mix_vec2(a_gapwidth, a_gapwidth_t);
lowp float offset = unpack_mix_vec2(a_offset, a_offset_t);
mediump float gapwidth = unpack_mix_vec2(a_gapwidth, a_gapwidth_t);
vec2 a_extrude = a_data.xy - 128.0;
float a_direction = mod(a_data.z, 4.0) - 1.0;