WINGDIAPI HDC APIENTRY
wglGetCurrentDC( VOID )
{
return stw_get_current_dc();
}
BOOL WINAPI
wglBindTexImageARB(HPBUFFERARB hPbuffer, int iBuffer)
{
HDC prevDrawable = stw_get_current_dc();
HDC prevReadable = stw_get_current_read_dc();
HDC dc;
struct stw_context *curctx = stw_current_context();
struct stw_framebuffer *fb;
GLenum texFormat, srcBuffer, target;
boolean retVal;
int pixelFormatSave;
/*
* Implementation notes:
* Ideally, we'd implement this function with the
* st_context_iface::teximage() function which replaces a specific
* texture image with a different resource (the pbuffer).
* The main problem however, is the pbuffer image is upside down relative
* to the texture image.
* Window system drawing surfaces (windows & pbuffers) are "top to bottom"
* while OpenGL texture images are "bottom to top". One possible solution
* to this is to invert rendering to pbuffers (as we do for renderbuffers)
* but that could lead to other issues (and would require extensive
* testing).
*
* The simple alternative is to use a copy-based approach which copies the
* pbuffer image into the texture via glCopyTex[Sub]Image. That's what
* we do here.
*/
if (!curctx) {
debug_printf("No rendering context in wglBindTexImageARB()\n");
SetLastError(ERROR_INVALID_OPERATION);
return FALSE;
}
fb = stw_framebuffer_from_HPBUFFERARB(hPbuffer);
if (!fb) {
debug_printf("Invalid pbuffer handle in wglBindTexImageARB()\n");
SetLastError(ERROR_INVALID_HANDLE);
return FALSE;
}
srcBuffer = translate_ibuffer(iBuffer);
if (srcBuffer == GL_NONE) {
debug_printf("Invalid buffer 0x%x in wglBindTexImageARB()\n", iBuffer);
SetLastError(ERROR_INVALID_DATA);
return FALSE;
}
target = translate_target(fb->textureTarget);
if (target == GL_NONE) {
debug_printf("no texture target in wglBindTexImageARB()\n");
return FALSE;
}
texFormat = translate_texture_format(fb->textureFormat);
if (texFormat == GL_NONE) {
debug_printf("no texture format in wglBindTexImageARB()\n");
return FALSE;
}
/*
* Bind the pbuffer surface so we can read/copy from it.
*
* Before we can call stw_make_current() we have to temporarily
* change the pbuffer's pixel format to match the context to avoid
* an error condition. After the stw_make_current() we restore the
* buffer's pixel format.
*/
pixelFormatSave = fb->iPixelFormat;
fb->iPixelFormat = curctx->iPixelFormat;
dc = wglGetPbufferDCARB(hPbuffer);
retVal = stw_make_current(dc, dc, curctx->dhglrc);
fb->iPixelFormat = pixelFormatSave;
if (!retVal) {
debug_printf("stw_make_current(#1) failed in wglBindTexImageARB()\n");
wglReleasePbufferDCARB(hPbuffer, dc);
return FALSE;
}
st_copy_framebuffer_to_texture(srcBuffer, fb->width, fb->height,
target, fb->textureLevel,
fb->textureFace, texFormat);
/* rebind previous drawing surface */
retVal = stw_make_current(prevDrawable, prevReadable, curctx->dhglrc);
if (!retVal) {
debug_printf("stw_make_current(#2) failed in wglBindTexImageARB()\n");
}
wglReleasePbufferDCARB(hPbuffer, dc);
return retVal;
}
