Move implementation source files to a conventional src directory

I think this attempt to be optionally header-only was misguided, particularly
installing source code to the system include path.  Typically anyone vendoring
code just includes the repository and builds from there anyway.

This commit moves all the implementation code to a typical src directory (Don't
Be Weird).

I still think there is some value in simple "inline" deployment, but that would
be better achieved another way, like producing a single-file amalgamation that
builds anywhere, ala sqlite.

1 files changed, 324 insertions, 0 deletions

diff --git a/src/win_gl.c b/src/win_gl.c
new file mode 100644
index 0000000..f011f5b
--- /dev/null
+++ b/src/win_gl.c
@@ -0,0 +1,324 @@
+/*
+  Copyright 2012-2020 David Robillard <d@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 win_gl.c
+   @brief OpenGL graphics backend for Windows.
+*/
+
+#include "stub.h"
+#include "types.h"
+#include "win.h"
+
+#include "pugl/pugl_gl.h"
+
+#include <windows.h>
+
+#include <GL/gl.h>
+
+#include <stdbool.h>
+#include <stdlib.h>
+
+#define WGL_DRAW_TO_WINDOW_ARB    0x2001
+#define WGL_ACCELERATION_ARB      0x2003
+#define WGL_SUPPORT_OPENGL_ARB    0x2010
+#define WGL_DOUBLE_BUFFER_ARB     0x2011
+#define WGL_PIXEL_TYPE_ARB        0x2013
+#define WGL_RED_BITS_ARB          0x2015
+#define WGL_GREEN_BITS_ARB        0x2017
+#define WGL_BLUE_BITS_ARB         0x2019
+#define WGL_ALPHA_BITS_ARB        0x201b
+#define WGL_DEPTH_BITS_ARB        0x2022
+#define WGL_STENCIL_BITS_ARB      0x2023
+#define WGL_FULL_ACCELERATION_ARB 0x2027
+#define WGL_TYPE_RGBA_ARB         0x202b
+#define WGL_SAMPLE_BUFFERS_ARB    0x2041
+#define WGL_SAMPLES_ARB           0x2042
+
+#define WGL_CONTEXT_MAJOR_VERSION_ARB 0x2091
+#define WGL_CONTEXT_MINOR_VERSION_ARB 0x2092
+#define WGL_CONTEXT_FLAGS_ARB         0x2094
+#define WGL_CONTEXT_PROFILE_MASK_ARB  0x9126
+
+#define WGL_CONTEXT_CORE_PROFILE_BIT_ARB          0x00000001
+#define WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002
+#define WGL_CONTEXT_DEBUG_BIT_ARB                 0x00000001
+
+typedef HGLRC (*WglCreateContextAttribs)(HDC, HGLRC, const int*);
+typedef BOOL (*WglSwapInterval)(int);
+typedef BOOL (*WglChoosePixelFormat)(
+	HDC, const int*, const FLOAT*, UINT, int*, UINT*);
+
+typedef struct {
+	WglChoosePixelFormat    wglChoosePixelFormat;
+	WglCreateContextAttribs wglCreateContextAttribs;
+	WglSwapInterval         wglSwapInterval;
+} PuglWinGlProcs;
+
+typedef struct {
+	PuglWinGlProcs procs;
+	HGLRC          hglrc;
+} PuglWinGlSurface;
+
+// Struct to manage the fake window used during configuration
+typedef struct {
+	HWND hwnd;
+	HDC  hdc;
+} PuglFakeWindow;
+
+static PuglStatus
+puglWinError(PuglFakeWindow* fakeWin, const PuglStatus status)
+{
+	if (fakeWin->hwnd) {
+		ReleaseDC(fakeWin->hwnd, fakeWin->hdc);
+		DestroyWindow(fakeWin->hwnd);
+	}
+
+	return status;
+}
+
+static PuglWinGlProcs puglWinGlGetProcs(void)
+{
+	const PuglWinGlProcs procs = {
+		(WglChoosePixelFormat)(
+			wglGetProcAddress("wglChoosePixelFormatARB")),
+		(WglCreateContextAttribs)(
+			wglGetProcAddress("wglCreateContextAttribsARB")),
+		(WglSwapInterval)(
+			wglGetProcAddress("wglSwapIntervalEXT"))
+	};
+
+	return procs;
+}
+
+static PuglStatus
+puglWinGlConfigure(PuglView* view)
+{
+	PuglInternals* impl = view->impl;
+
+	// Set attributes to default if they are unset
+	// (There is no GLX_DONT_CARE equivalent on Windows)
+	if (view->hints[PUGL_DEPTH_BITS] == PUGL_DONT_CARE) {
+		view->hints[PUGL_DEPTH_BITS] = 0;
+	}
+	if (view->hints[PUGL_STENCIL_BITS] == PUGL_DONT_CARE) {
+		view->hints[PUGL_STENCIL_BITS] = 0;
+	}
+	if (view->hints[PUGL_SAMPLES] == PUGL_DONT_CARE) {
+		view->hints[PUGL_SAMPLES] = 1;
+	}
+	if (view->hints[PUGL_DOUBLE_BUFFER] == PUGL_DONT_CARE) {
+		view->hints[PUGL_DOUBLE_BUFFER] = 1;
+	}
+	if (view->hints[PUGL_SWAP_INTERVAL] == PUGL_DONT_CARE) {
+		view->hints[PUGL_SWAP_INTERVAL] = 1;
+	}
+
+	// clang-format off
+	const int pixelAttrs[] = {
+		WGL_DRAW_TO_WINDOW_ARB, GL_TRUE,
+		WGL_ACCELERATION_ARB,   WGL_FULL_ACCELERATION_ARB,
+		WGL_SUPPORT_OPENGL_ARB, GL_TRUE,
+		WGL_DOUBLE_BUFFER_ARB,  view->hints[PUGL_DOUBLE_BUFFER],
+		WGL_PIXEL_TYPE_ARB,     WGL_TYPE_RGBA_ARB,
+		WGL_SAMPLE_BUFFERS_ARB, view->hints[PUGL_SAMPLES] ? 1 : 0,
+		WGL_SAMPLES_ARB,        view->hints[PUGL_SAMPLES],
+		WGL_RED_BITS_ARB,       view->hints[PUGL_RED_BITS],
+		WGL_GREEN_BITS_ARB,     view->hints[PUGL_GREEN_BITS],
+		WGL_BLUE_BITS_ARB,      view->hints[PUGL_BLUE_BITS],
+		WGL_ALPHA_BITS_ARB,     view->hints[PUGL_ALPHA_BITS],
+		WGL_DEPTH_BITS_ARB,     view->hints[PUGL_DEPTH_BITS],
+		WGL_STENCIL_BITS_ARB,   view->hints[PUGL_STENCIL_BITS],
+		0,
+	};
+	// clang-format on
+
+	PuglWinGlSurface* const surface =
+		(PuglWinGlSurface*)calloc(1, sizeof(PuglWinGlSurface));
+	impl->surface = surface;
+
+	// Create fake window for getting at GL context
+	PuglStatus         st      = PUGL_SUCCESS;
+	PuglFakeWindow     fakeWin = {0, 0};
+	static const char* title   = "Pugl Configuration";
+	if ((st = puglWinCreateWindow(view, title, &fakeWin.hwnd, &fakeWin.hdc))) {
+		return puglWinError(&fakeWin, st);
+	}
+
+	// Set pixel format for fake window
+	const PuglWinPFD fakePfd  = puglWinGetPixelFormatDescriptor(view->hints);
+	const int        fakePfId = ChoosePixelFormat(fakeWin.hdc, &fakePfd);
+	if (!fakePfId || !SetPixelFormat(fakeWin.hdc, fakePfId, &fakePfd)) {
+		return puglWinError(&fakeWin, PUGL_SET_FORMAT_FAILED);
+	}
+
+	// Create fake GL context to get at the functions we need
+	HGLRC fakeRc = wglCreateContext(fakeWin.hdc);
+	if (!fakeRc) {
+		return puglWinError(&fakeWin, PUGL_CREATE_CONTEXT_FAILED);
+	}
+
+	// Enter fake context and get extension functions
+	wglMakeCurrent(fakeWin.hdc, fakeRc);
+	surface->procs = puglWinGlGetProcs();
+
+	if (surface->procs.wglChoosePixelFormat) {
+		// Choose pixel format based on attributes
+		UINT numFormats = 0;
+		if (!surface->procs.wglChoosePixelFormat(
+			    fakeWin.hdc, pixelAttrs, NULL, 1u, &impl->pfId, &numFormats)) {
+			return puglWinError(&fakeWin, PUGL_SET_FORMAT_FAILED);
+		}
+
+		DescribePixelFormat(
+			impl->hdc, impl->pfId, sizeof(impl->pfd), &impl->pfd);
+	} else {
+		// Modern extensions not available, use basic pixel format
+		impl->pfd  = fakePfd;
+		impl->pfId = fakePfId;
+	}
+
+	// Dispose of fake window and context
+	wglMakeCurrent(NULL, NULL);
+	wglDeleteContext(fakeRc);
+	ReleaseDC(fakeWin.hwnd, fakeWin.hdc);
+	DestroyWindow(fakeWin.hwnd);
+
+	return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglWinGlCreate(PuglView* view)
+{
+	PuglInternals* const    impl    = view->impl;
+	PuglWinGlSurface* const surface = (PuglWinGlSurface*)impl->surface;
+	PuglStatus              st      = PUGL_SUCCESS;
+
+	const int contextAttribs[] = {
+	    WGL_CONTEXT_MAJOR_VERSION_ARB,
+	    view->hints[PUGL_CONTEXT_VERSION_MAJOR],
+
+	    WGL_CONTEXT_MINOR_VERSION_ARB,
+	    view->hints[PUGL_CONTEXT_VERSION_MINOR],
+
+	    WGL_CONTEXT_FLAGS_ARB,
+	    (view->hints[PUGL_USE_DEBUG_CONTEXT] ? WGL_CONTEXT_DEBUG_BIT_ARB : 0),
+
+	    WGL_CONTEXT_PROFILE_MASK_ARB,
+	    (view->hints[PUGL_USE_COMPAT_PROFILE]
+	         ? WGL_CONTEXT_CORE_PROFILE_BIT_ARB
+	         : WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB),
+
+	    0};
+
+	// Create real window with desired pixel format
+	if ((st = puglWinCreateWindow(view, "Pugl", &impl->hwnd, &impl->hdc))) {
+		return st;
+	} else if (!SetPixelFormat(impl->hdc, impl->pfId, &impl->pfd)) {
+		ReleaseDC(impl->hwnd, impl->hdc);
+		DestroyWindow(impl->hwnd);
+		impl->hwnd = NULL;
+		impl->hdc  = NULL;
+		return PUGL_SET_FORMAT_FAILED;
+	}
+
+	// Create GL context
+	if (surface->procs.wglCreateContextAttribs &&
+	    !(surface->hglrc = surface->procs.wglCreateContextAttribs(
+		      impl->hdc, 0, contextAttribs))) {
+		return PUGL_CREATE_CONTEXT_FAILED;
+	} else if (!(surface->hglrc = wglCreateContext(impl->hdc))) {
+		return PUGL_CREATE_CONTEXT_FAILED;
+	}
+
+	// Enter context and set swap interval
+	wglMakeCurrent(impl->hdc, surface->hglrc);
+	const int swapInterval = view->hints[PUGL_SWAP_INTERVAL];
+	if (surface->procs.wglSwapInterval && swapInterval != PUGL_DONT_CARE) {
+		surface->procs.wglSwapInterval(swapInterval);
+	}
+
+	return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglWinGlDestroy(PuglView* view)
+{
+	PuglWinGlSurface* surface = (PuglWinGlSurface*)view->impl->surface;
+	if (surface) {
+		wglMakeCurrent(NULL, NULL);
+		wglDeleteContext(surface->hglrc);
+		free(surface);
+		view->impl->surface = NULL;
+	}
+
+	return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglWinGlEnter(PuglView* view, const PuglEventExpose* expose)
+{
+	PuglWinGlSurface* surface = (PuglWinGlSurface*)view->impl->surface;
+
+	wglMakeCurrent(view->impl->hdc, surface->hglrc);
+
+	if (expose) {
+		PAINTSTRUCT ps;
+		BeginPaint(view->impl->hwnd, &ps);
+	}
+
+	return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglWinGlLeave(PuglView* view, const PuglEventExpose* expose)
+{
+	if (expose) {
+		PAINTSTRUCT ps;
+		EndPaint(view->impl->hwnd, &ps);
+		SwapBuffers(view->impl->hdc);
+	}
+
+	wglMakeCurrent(NULL, NULL);
+	return PUGL_SUCCESS;
+}
+
+PuglGlFunc
+puglGetProcAddress(const char* name)
+{
+	const PuglGlFunc func = (PuglGlFunc)wglGetProcAddress(name);
+
+	/* Windows has the annoying property that wglGetProcAddress returns NULL
+	   for functions from OpenGL 1.1, so we fall back to pulling them directly
+	   from opengl32.dll */
+
+	return func
+		? func
+		: (PuglGlFunc)GetProcAddress(GetModuleHandle("opengl32.dll"), name);
+}
+
+const PuglBackend*
+puglGlBackend(void)
+{
+	static const PuglBackend backend = {puglWinGlConfigure,
+	                                    puglWinGlCreate,
+	                                    puglWinGlDestroy,
+	                                    puglWinGlEnter,
+	                                    puglWinGlLeave,
+	                                    puglStubGetContext};
+
+	return &backend;
+}