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opengl: Add coments about #629

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Hajime Hoshi 2018-09-29 02:20:02 +09:00
parent eb0f0e6ced
commit c4abed0a22
1 changed files with 7 additions and 3 deletions
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10
internal/opengl/context_js.go
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@ -182,9 +182,13 @@ func (c *Context) NewTexture(width, height int) (Texture, error) {
gl.Call("texParameteri", texture2d, textureWrapS, clampToEdge)
gl.Call("texParameteri", texture2d, textureWrapT, clampToEdge)
// void texImage2D(GLenum target, GLint level, GLenum internalformat,
// GLsizei width, GLsizei height, GLint border, GLenum format,
// GLenum type, ArrayBufferView? pixels);
// Firefox warns the usage of textures without specifying pixels (#629)
//
// Error: WebGL warning: drawElements: This operation requires zeroing texture data. This is slow.
//
// In Ebiten, textures are filled with pixels laster by the filter that ignores destination, so it is fine
// to leave textures as uninitialized here. Rather, extra memory allocating for initialization should be
// avoided.
gl.Call("texImage2D", texture2d, 0, rgba, width, height, 0, rgba, unsignedByte, nil)
return Texture(t), nil