'port' libui GL stuff to Linux

Only implemented the functions needed by melonDS, and only tested using
a very recent mesa+libglvnd+nouveau. Will most likely bork using
proprietary nvidia or old(er) drivers (see gl.c)

1 files changed, 47 insertions, 0 deletions

diff --git a/src/libui_sdl/libui/unix/gl.c b/src/libui_sdl/libui/unix/gl.c
new file mode 100644
index 0000000..da41437
--- /dev/null
+++ b/src/libui_sdl/libui/unix/gl.c
@@ -0,0 +1,47 @@
+// 26 may 2019
+#include "uipriv_unix.h"
+
+/*
+ *(melonDS:17013): Gtk-CRITICAL **: 00:28:09.095: gtk_gl_area_set_required_version: assertion 'GTK_IS_GL_AREA (area)' failed
+
+(melonDS:17013): GLib-GObject-WARNING **: 00:28:09.096: invalid cast from 'GtkGLArea' to 'areaWidget'
+ */
+
+struct uiGLContext {
+	GtkGLArea *gla;
+	GdkGLContext *gctx;
+	int vermaj, vermin;
+};
+
+uiGLContext *createGLContext(GtkGLArea* gla, int maj, int min)
+{
+	uiGLContext *ret = uiAlloc(sizeof(uiGLContext), "uiGLContext");
+	ret->gla = gla;
+	ret->gctx = gtk_gl_area_get_context(gla);
+	ret->vermaj = maj; ret->vermin = min;
+	return ret;
+}
+
+void uiGLSwapBuffers(uiGLContext* ctx)
+{
+	if (!ctx) return;
+	gtk_gl_area_attach_buffers(ctx->gla);
+}
+
+void uiGLMakeContextCurrent(uiGLContext* ctx)
+{
+	if (!ctx) return;
+	gtk_gl_area_make_current(ctx->gla);
+}
+void *uiGLGetProcAddress(const char* proc)
+{
+	// this *will* break for older systems that don't have libglvnd!
+	// TODO: use a real solution
+	return dlsym(NULL /* RTLD_DEFAULT */, proc);
+}
+unsigned int uiGLGetVersion(uiGLContext* ctx)
+{
+	if (!ctx) return 0;
+	return uiGLVersion(ctx->vermaj, ctx->vermin);
+}
+