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677a3f2f88
The spec [1] says that the maximum value for a mediump float is at least 2¹⁴ in section 4.5.2. However, when using a 4k resolution texture coordinates will exceed this value. This causes issues on drivers which implement mediump as a 16-bit [2]. Switch to highp. There's a twist: on GLES2, support for highp is optional. So we need to guard it with cute GL_FRAGMENT_PRECISION_HIGH ifdefs. [1]: https://registry.khronos.org/OpenGL/specs/es/2.0/GLSL_ES_Specification_1.00.pdf [2]: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21082
13 lines
249 B
GLSL
13 lines
249 B
GLSL
#ifdef GL_FRAGMENT_PRECISION_HIGH
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precision highp float;
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#else
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precision mediump float;
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#endif
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varying vec2 v_texcoord;
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uniform sampler2D tex;
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uniform float alpha;
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void main() {
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gl_FragColor = vec4(texture2D(tex, v_texcoord).rgb, 1.0) * alpha;
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}
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