diff options
Diffstat (limited to 'src/Runtime/res/effectlib/distancefieldtext.vert')
| -rw-r--r-- | src/Runtime/res/effectlib/distancefieldtext.vert | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/Runtime/res/effectlib/distancefieldtext.vert b/src/Runtime/res/effectlib/distancefieldtext.vert index 01024c6b..f6b2de41 100644 --- a/src/Runtime/res/effectlib/distancefieldtext.vert +++ b/src/Runtime/res/effectlib/distancefieldtext.vert @@ -1,3 +1,9 @@ +#ifdef GL_OES_standard_derivatives +# extension GL_OES_standard_derivatives : enable +#else +# define use_fallback +#endif + uniform highp mat4 mvp; uniform highp float fontScale; uniform int textureWidth; @@ -7,6 +13,8 @@ attribute highp vec3 vCoord; attribute highp vec2 tCoord; varying highp vec2 sampleCoord; + +#ifdef use_fallback varying highp vec2 alphas; highp float thresholdFunc(highp float scale) @@ -55,11 +63,15 @@ highp float determinant(highp mat4 m) det -= m[3][0] * determinantOfSubmatrix(m, 0, 1, 2, 1, 2, 3); return det; } +#endif void main() { - highp float scale = fontScale * sqrt(abs(determinant(mvp))); +#ifdef use_fallback + highp float scale = fontScale * pow(abs(determinant(mvp)), 1.0 / 3.0); alphas = alphaRange(scale); - sampleCoord = tCoord * vec2(1.0 / highp float(textureWidth), 1.0 / highp float(textureHeight)); +#endif + + sampleCoord = tCoord * vec2(1.0 / float(textureWidth), 1.0 / float(textureHeight)); gl_Position = mvp * vec4(vCoord, 1.0); } |