1 files changed, 145 insertions, 0 deletions
diff --git a/twin/compton-tde/opengl.h b/twin/compton-tde/opengl.h
new file mode 100644
index 000000000..8628e36d3
--- /dev/null
+++ b/twin/compton-tde/opengl.h
@@ -0,0 +1,145 @@
+/*
+ * Compton - a compositor for X11
+ *
+ * Based on `xcompmgr` - Copyright (c) 2003, Keith Packard
+ *
+ * Copyright (c) 2011-2013, Christopher Jeffrey
+ * See LICENSE for more information.
+ *
+ */
+
+#include "common.h"
+
+#include <ctype.h>
+#include <locale.h>
+
+#ifdef DEBUG_GLX_ERR
+
+/**
+ * Get a textual representation of an OpenGL error.
+ */
+static inline const char *
+glx_dump_err_str(GLenum err) {
+  switch (err) {
+    CASESTRRET(GL_NO_ERROR);
+    CASESTRRET(GL_INVALID_ENUM);
+    CASESTRRET(GL_INVALID_VALUE);
+    CASESTRRET(GL_INVALID_OPERATION);
+    CASESTRRET(GL_INVALID_FRAMEBUFFER_OPERATION);
+    CASESTRRET(GL_OUT_OF_MEMORY);
+    CASESTRRET(GL_STACK_UNDERFLOW);
+    CASESTRRET(GL_STACK_OVERFLOW);
+  }
+
+  return NULL;
+}
+
+/**
+ * Check for GLX error.
+ *
+ * http://blog.nobel-joergensen.com/2013/01/29/debugging-opengl-using-glgeterror/
+ */
+static inline void
+glx_check_err_(session_t *ps, const char *func, int line) {
+  if (!ps->glx_context) return;
+
+  GLenum err = GL_NO_ERROR;
+  
+  while (GL_NO_ERROR != (err = glGetError())) {
+    print_timestamp(ps);
+    printf("%s():%d: GLX error ", func, line);
+    const char *errtext = glx_dump_err_str(err);
+    if (errtext) {
+      printf_dbg("%s\n", errtext);
+    }
+    else {
+      printf_dbg("%d\n", err);
+    }
+  }
+}
+
+#define glx_check_err(ps) glx_check_err_(ps, __func__, __LINE__)
+#else
+#define glx_check_err(ps) ((void) 0)
+#endif
+
+/**
+ * Check if a word is in string.
+ */
+static inline bool
+wd_is_in_str(const char *haystick, const char *needle) {
+  if (!haystick)
+    return false;
+
+  assert(*needle);
+
+  const char *pos = haystick - 1;
+  while ((pos = strstr(pos + 1, needle))) {
+    // Continue if it isn't a word boundary
+    if (((pos - haystick) && !isspace(*(pos - 1)))
+        || (strlen(pos) > strlen(needle) && !isspace(pos[strlen(needle)])))
+      continue;
+    return true;
+  }
+
+  return false;
+}
+
+/**
+ * Check if a GLX extension exists.
+ */
+static inline bool
+glx_hasglxext(session_t *ps, const char *ext) {
+  const char *glx_exts = glXQueryExtensionsString(ps->dpy, ps->scr);
+  if (!glx_exts) {
+    printf_errf("(): Failed get GLX extension list.");
+    return false;
+  }
+
+  bool found = wd_is_in_str(glx_exts, ext);
+  if (!found)
+    printf_errf("(): Missing GLX extension %s.", ext);
+
+  return found;
+}
+
+/**
+ * Check if a GLX extension exists.
+ */
+static inline bool
+glx_hasglext(session_t *ps, const char *ext) {
+  const char *gl_exts = (const char *) glGetString(GL_EXTENSIONS);
+  if (!gl_exts) {
+    printf_errf("(): Failed get GL extension list.");
+    return false;
+  }
+
+  bool found = wd_is_in_str(gl_exts, ext);
+  if (!found)
+    printf_errf("(): Missing GL extension %s.", ext);
+
+  return found;
+}
+
+static inline XVisualInfo *
+get_visualinfo_from_visual(session_t *ps, Visual *visual) {
+  XVisualInfo vreq = { .visualid = XVisualIDFromVisual(visual) };
+  int nitems = 0;
+
+  return XGetVisualInfo(ps->dpy, VisualIDMask, &vreq, &nitems);
+}
+
+static bool
+glx_update_fbconfig(session_t *ps);
+
+static int
+glx_cmp_fbconfig(session_t *ps,
+    const glx_fbconfig_t *pfbc_a, const glx_fbconfig_t *pfbc_b);
+
+static void
+glx_render_color(session_t *ps, int dx, int dy, int width, int height, int z,
+    XserverRegion reg_tgt, const reg_data_t *pcache_reg);
+
+static void
+glx_render_dots(session_t *ps, int dx, int dy, int width, int height, int z,
+    XserverRegion reg_tgt, const reg_data_t *pcache_reg);