Draw to a texture using OpenVG
Posted: Wed Jun 25, 2014 9:37 pm
I'm using both OpenGL and OpenVG on my application, and i'm using the VGFONT native implementation to draw texts.
Everything was wokring fine until now, cause i've been rendering directly on the screen, into a window surface. But now I need to draw a text into an OpenGL texture instead.
Since I can't use fbo's with OpenVG i thought that I could use the EGL pbuffers instead, since I'd be using only openVG and EGL. However I'm getting an EGL_BAD_MATCH error when I try to make the pbuffer the current surface.
The code uses two EGLContexts, one for the OpenGL part and one that is part of the VGFONT implementation. The same pbuffer needs to access both contexts. When i use window surfaces, this works perfectly, but I just can't get it working for the pbuffers.
I've modified the create_context method on VGFONT to use pbuffers like this:
the EGLContext is created without errors.
The pbuffers are created successfully by
However the method gx_priv_save() on VGFONT fails when it calls eglMakeCurrent().
Does anyone know what I'm doing wrong, or have a better solution for drawing into an OpenGL texture using OpenVG?
Everything was wokring fine until now, cause i've been rendering directly on the screen, into a window surface. But now I need to draw a text into an OpenGL texture instead.
Since I can't use fbo's with OpenVG i thought that I could use the EGL pbuffers instead, since I'd be using only openVG and EGL. However I'm getting an EGL_BAD_MATCH error when I try to make the pbuffer the current surface.
The code uses two EGLContexts, one for the OpenGL part and one that is part of the VGFONT implementation. The same pbuffer needs to access both contexts. When i use window surfaces, this works perfectly, but I just can't get it working for the pbuffers.
I've modified the create_context method on VGFONT to use pbuffers like this:
Code: Select all
attribs[n++] = EGL_RENDERABLE_TYPE; attribs[n++] = EGL_OPENVG_BIT;
//attribs[n++] = EGL_SURFACE_TYPE; attribs[n++] = EGL_WINDOW_BIT;
attribs[n++] = EGL_SURFACE_TYPE; attribs[n++] = EGL_PBUFFER_BIT;
attribs[n] = EGL_NONE;*/The pbuffers are created successfully by
Code: Select all
EGLBoolean esCreatePbuffer(ESContext *esContext, EGLSurface *surface, int width, int height)
{
/*static const EGLint attribListPbuffer[] =
{
EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
EGL_RED_SIZE, 5,
EGL_GREEN_SIZE, 6,
EGL_BLUE_SIZE, 5,
EGL_ALPHA_SIZE, 0,
EGL_DEPTH_SIZE, 16,
EGL_STENCIL_SIZE, 0,
EGL_NONE
};*/
EGLint srfPbufferAttr[] =
{
EGL_WIDTH, width,
EGL_HEIGHT, height,
// EGL_COLORSPACE, GL_RGB,
// EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGB,
// EGL_TEXTURE_TARGET, EGL_TEXTURE_2D,
EGL_LARGEST_PBUFFER, EGL_TRUE,
EGL_NONE
};
*surface = eglCreatePbufferSurface(esContext->eglDisplay,
esContext->eglConfig,srfPbufferAttr);
if ( *surface == EGL_NO_SURFACE )
{
_findEGLError2(574);
}
esMakeCurrent(esContext, *surface);
}Does anyone know what I'm doing wrong, or have a better solution for drawing into an OpenGL texture using OpenVG?