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author | Molly Lloyd <molly@mapbox.com> | 2017-03-01 11:28:31 -0800 |
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committer | John Firebaugh <john.firebaugh@gmail.com> | 2017-03-08 15:23:25 -0800 |
commit | 692f5e0a9f5321ee2932a976a8eb9e0a83fc3352 (patch) | |
tree | cb9ff13dc30455f1700eeb691dc155d0981c4116 /src/mbgl/shaders/fill_outline_pattern.cpp | |
parent | 3afae825c7b2f95e58cbcb85c59857f2253c945e (diff) | |
download | qtlocation-mapboxgl-692f5e0a9f5321ee2932a976a8eb9e0a83fc3352.tar.gz |
Pack min + max into one attribute :muscle:
Some devices supported by Mapbox GL provide only 8 vertex attributes; this change packs existing attributes to get us just under that limit.
For properties using a composite function, pack the min and max values into a single attribute with two logical components instead of using two separate attributes and buffers. Special logic is included for color attributes, whose integer components must be packed into the available bits of floating-point attributes. (We don't have access to ivec types in GL ES 2.0.)
For source functions, continue to bind just a one-component attribute even though the GLSL type is vec2 (or vec4 for colors). The type-checking done by gl::Attribute is relaxed slightly to accommodate this.
Diffstat (limited to 'src/mbgl/shaders/fill_outline_pattern.cpp')
-rw-r--r-- | src/mbgl/shaders/fill_outline_pattern.cpp | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/src/mbgl/shaders/fill_outline_pattern.cpp b/src/mbgl/shaders/fill_outline_pattern.cpp index 6e9d6ad9a1..5e38023382 100644 --- a/src/mbgl/shaders/fill_outline_pattern.cpp +++ b/src/mbgl/shaders/fill_outline_pattern.cpp @@ -24,12 +24,11 @@ varying vec2 v_pos_b; varying vec2 v_pos; uniform lowp float a_opacity_t; -attribute lowp float a_opacity_min; -attribute lowp float a_opacity_max; +attribute lowp vec2 a_opacity; varying lowp float opacity; void main() { - opacity = mix(a_opacity_min, a_opacity_max, a_opacity_t); + opacity = unpack_mix_vec2(a_opacity, a_opacity_t); gl_Position = u_matrix * vec4(a_pos, 0, 1); |