Reorganize source to separate private implementation details

Taking a page from C++ convention, where "detail" is for things that should not
be included in user code.

1 files changed, 213 insertions, 0 deletions

diff --git a/pugl/detail/x11_gl.c b/pugl/detail/x11_gl.c
new file mode 100644
index 0000000..7fcf169
--- /dev/null
+++ b/pugl/detail/x11_gl.c
@@ -0,0 +1,213 @@
+/*
+  Copyright 2012-2019 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/**
+   @file x11_gl.c OpenGL graphics backend for X11.
+*/
+
+#include "pugl/detail/implementation.h"
+#include "pugl/detail/x11.h"
+#include "pugl/pugl_gl_backend.h"
+
+#include <GL/gl.h>
+#include <GL/glx.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+
+typedef struct {
+	GLXFBConfig fb_config;
+	GLXContext  ctx;
+	int         double_buffered;
+} PuglX11GlSurface;
+
+static int
+puglX11GlHintValue(const int value)
+{
+	return value == PUGL_DONT_CARE ? (int)GLX_DONT_CARE : value;
+}
+
+static int
+puglX11GlGetAttrib(Display* const    display,
+                   const GLXFBConfig fb_config,
+                   const int         attrib)
+{
+	int value = 0;
+	glXGetFBConfigAttrib(display, fb_config, attrib, &value);
+	return value;
+}
+
+static int
+puglX11GlConfigure(PuglView* view)
+{
+	PuglInternals* const impl    = view->impl;
+	const int            screen  = impl->screen;
+	Display* const       display = impl->display;
+
+	PuglX11GlSurface* const surface =
+		(PuglX11GlSurface*)calloc(1, sizeof(PuglX11GlSurface));
+	impl->surface = surface;
+
+	const int attrs[] = {
+		GLX_X_RENDERABLE,  True,
+		GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
+		GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
+		GLX_RENDER_TYPE,   GLX_RGBA_BIT,
+		GLX_SAMPLES,       view->hints.samples,
+		GLX_RED_SIZE,      puglX11GlHintValue(view->hints.red_bits),
+		GLX_GREEN_SIZE,    puglX11GlHintValue(view->hints.green_bits),
+		GLX_BLUE_SIZE,     puglX11GlHintValue(view->hints.blue_bits),
+		GLX_ALPHA_SIZE,    puglX11GlHintValue(view->hints.alpha_bits),
+		GLX_DEPTH_SIZE,    puglX11GlHintValue(view->hints.depth_bits),
+		GLX_STENCIL_SIZE,  puglX11GlHintValue(view->hints.stencil_bits),
+		GLX_DOUBLEBUFFER,  puglX11GlHintValue(view->hints.double_buffer),
+		None
+	};
+
+	int          n_fbc = 0;
+	GLXFBConfig* fbc   = glXChooseFBConfig(display, screen, attrs, &n_fbc);
+	if (n_fbc <= 0) {
+		fprintf(stderr, "error: Failed to create GL context\n");
+		return 1;
+	}
+
+	surface->fb_config = fbc[0];
+	impl->vi           = glXGetVisualFromFBConfig(impl->display, fbc[0]);
+
+	printf("Using visual 0x%lX: R=%d G=%d B=%d A=%d D=%d"
+	       " DOUBLE=%d SAMPLES=%d\n",
+	       impl->vi->visualid,
+	       puglX11GlGetAttrib(display, fbc[0], GLX_RED_SIZE),
+	       puglX11GlGetAttrib(display, fbc[0], GLX_GREEN_SIZE),
+	       puglX11GlGetAttrib(display, fbc[0], GLX_BLUE_SIZE),
+	       puglX11GlGetAttrib(display, fbc[0], GLX_ALPHA_SIZE),
+	       puglX11GlGetAttrib(display, fbc[0], GLX_DEPTH_SIZE),
+	       puglX11GlGetAttrib(display, fbc[0], GLX_DOUBLEBUFFER),
+	       puglX11GlGetAttrib(display, fbc[0], GLX_SAMPLES));
+
+	XFree(fbc);
+
+	return 0;
+}
+
+static int
+puglX11GlCreate(PuglView* view)
+{
+	PuglInternals* const    impl      = view->impl;
+	PuglX11GlSurface* const surface   = (PuglX11GlSurface*)impl->surface;
+	Display* const          display   = impl->display;
+	const GLXFBConfig       fb_config = surface->fb_config;
+
+	const int ctx_attrs[] = {
+		GLX_CONTEXT_MAJOR_VERSION_ARB, view->hints.context_version_major,
+		GLX_CONTEXT_MINOR_VERSION_ARB, view->hints.context_version_minor,
+		GLX_CONTEXT_PROFILE_MASK_ARB, (view->hints.use_compat_profile
+		                               ? GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB
+		                               : GLX_CONTEXT_CORE_PROFILE_BIT_ARB),
+		0};
+
+	typedef GLXContext (*CreateContextAttribs)(
+		Display*, GLXFBConfig, GLXContext, Bool, const int*);
+
+	CreateContextAttribs create_context =
+		(CreateContextAttribs)glXGetProcAddress(
+			(const GLubyte*)"glXCreateContextAttribsARB");
+
+	impl->surface = surface;
+	surface->ctx  = create_context(display, fb_config, 0, GL_TRUE, ctx_attrs);
+	if (!surface->ctx) {
+		surface->ctx =
+			glXCreateNewContext(display, fb_config, GLX_RGBA_TYPE, 0, True);
+	}
+
+	glXGetConfig(impl->display,
+	             impl->vi,
+	             GLX_DOUBLEBUFFER,
+	             &surface->double_buffered);
+
+	return 0;
+}
+
+static int
+puglX11GlDestroy(PuglView* view)
+{
+	PuglX11GlSurface* surface = (PuglX11GlSurface*)view->impl->surface;
+	if (surface) {
+		glXDestroyContext(view->impl->display, surface->ctx);
+		free(surface);
+		view->impl->surface = NULL;
+	}
+	return 0;
+}
+
+static int
+puglX11GlEnter(PuglView* view, bool PUGL_UNUSED(drawing))
+{
+	PuglX11GlSurface* surface = (PuglX11GlSurface*)view->impl->surface;
+	glXMakeCurrent(view->impl->display, view->impl->win, surface->ctx);
+	return 0;
+}
+
+static int
+puglX11GlLeave(PuglView* view, bool drawing)
+{
+	PuglX11GlSurface* surface = (PuglX11GlSurface*)view->impl->surface;
+
+	if (drawing && surface->double_buffered) {
+		glXSwapBuffers(view->impl->display, view->impl->win);
+	} else if (drawing) {
+		glFlush();
+	}
+
+	glXMakeCurrent(view->impl->display, None, NULL);
+
+	return 0;
+}
+
+static int
+puglX11GlResize(PuglView* PUGL_UNUSED(view),
+                int       PUGL_UNUSED(width),
+                int       PUGL_UNUSED(height))
+{
+	return 0;
+}
+
+static void*
+puglX11GlGetContext(PuglView* PUGL_UNUSED(view))
+{
+	return NULL;
+}
+
+PuglGlFunc
+puglGetProcAddress(const char* name)
+{
+	return glXGetProcAddress((const GLubyte*)name);
+}
+
+const PuglBackend* puglGlBackend(void)
+{
+	static const PuglBackend backend = {
+		puglX11GlConfigure,
+		puglX11GlCreate,
+		puglX11GlDestroy,
+		puglX11GlEnter,
+		puglX11GlLeave,
+		puglX11GlResize,
+		puglX11GlGetContext
+	};
+
+	return &backend;
+}