Getting a Surface from a Texture OpenGL

[pingutz]

Hi guys,

I am trying to learn graphics programming and getting an opengl texture I can use in my game engine. First I rendered directly to the FBO0 and my surface was created successfully, now I only get a nullptr. This is my initskia function.

`

auto nativeInterface = GrGLMakeNativeInterface();

sContext = GrDirectContext::MakeGL(nativeInterface).release();

GrGLTextureInfo textureInfo;

GrBackendTexture allocated_texture = sContext->createBackendTexture(

400, 400, GrBackendFormats::MakeGL(GL_RGB8, GL_TEXTURE_2D), GrMipmapped::k, GrRenderable::kYes);

if (!GrBackendTextures::GetGLTextureInfo(allocated_texture,

&textureInfo)) {

std::cout << "allocating texture failed" << std::endl;

}

sSurface = SkSurfaces::WrapBackendTexture(sContext, allocated_texture, kTopLeft_GrSurfaceOrigin, 1, SkColorType::kRGBA_8888_SkColorType, nullptr,

nullptr, nullptr, nullptr).release();

` I am using SDL and I created a context and made it current. I would be very thankful for telling me what I am doing wrong or giving me a working code sample.

[Brian Salomon]

I think your problem is that you're telling Skia that your texture doesn't have an alpha channel (GL_RGB8 not GL_RGBA8) and then asking for the surface to use an SkColorType that does have alpha (kRGBA_8888_SkColorType).

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[pingutz]

Really obvious in hindsight,

thanks a lot!