/**
* Check if the viewport/scissor size has not yet been initialized.
* Initialize the size if the given width and height are non-zero.
*/
void
_mesa_check_init_viewport(GLcontext *ctx, GLuint width, GLuint height)
{
if (!ctx->ViewportInitialized && width > 0 && height > 0) {
/* Note: set flag here, before calling _mesa_set_viewport(), to prevent
* potential infinite recursion.
*/
ctx->ViewportInitialized = GL_TRUE;
_mesa_set_viewport(ctx, 0, 0, width, height);
_mesa_set_scissor(ctx, 0, 0, width, height);
}
}
/**
* Called via glScissor
*/
void GLAPIENTRY
_mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
{
GET_CURRENT_CONTEXT(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height);
if (width < 0 || height < 0) {
_mesa_error( ctx, GL_INVALID_VALUE, "glScissor" );
return;
}
_mesa_set_scissor(ctx, x, y, width, height);
}
void st_make_current(struct st_context *st,
struct st_framebuffer *draw,
struct st_framebuffer *read)
{
if (st) {
GLboolean firstTime = st->ctx->FirstTimeCurrent;
_mesa_make_current(st->ctx, &draw->Base, &read->Base);
/* Need to initialize viewport here since draw->Base->Width/Height
* will still be zero at this point.
* This could be improved, but would require rather extensive work
* elsewhere (allocate rb surface storage sooner)
*/
if (firstTime) {
GLuint w = draw->InitWidth, h = draw->InitHeight;
_mesa_set_viewport(st->ctx, 0, 0, w, h);
_mesa_set_scissor(st->ctx, 0, 0, w, h);
}
}
else {
_mesa_make_current(NULL, NULL, NULL);
}
}