Hajime Hoshi b1d7a5f595 shaderir/glsl: Enable dFdx for WebGL ... With WebGL1, an extension is required for dFdx. On the other hand, with WebGL2, GLSL ES 300 is required and the extension is forbidden. This change fixes shaderir/glsl to switch the output depends on the WebGL version. This change also adds a new build tag 'ebitenwebgl1' forcing WebGL 1. Updates #1404		2020-11-21 19:07:54 +09:00
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metal	graphicsdriver/metal: Asynchronous sending pixels	2020-11-10 22:48:03 +09:00
opengl	shaderir/glsl: Enable dFdx for WebGL	2020-11-21 19:07:54 +09:00