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From e1eb076e87330b4cc197ae9f88cb1ede215dea71 Mon Sep 17 00:00:00 2001
From: Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
Date: Mon, 9 Mar 2020 16:46:37 -0300
Subject: [PATCH 03/24] libobs-opengl: Factor out GLX winsys
Move the GLX-related code to gl-x11-glx, and introduce gl-nix as
a winsys-agnostic abstraction layer. gl-nix serves as the runtime
selector of which winsys going to be used. Only the X11/GLX winsys
is available now, but later commits will introduce the X11/EGL
winsys as well.
The gl-nix code was originally written by Jason Francis <cycl0ps@tuta.io>
---
libobs-opengl/CMakeLists.txt | 1 +
libobs-opengl/gl-nix.c | 107 +++++++++++++++++++++++++++++++++++
libobs-opengl/gl-nix.h | 53 +++++++++++++++++
libobs-opengl/gl-x11-glx.c | 59 +++++++++++++------
libobs-opengl/gl-x11-glx.h | 22 +++++++
5 files changed, 224 insertions(+), 18 deletions(-)
create mode 100644 libobs-opengl/gl-nix.c
create mode 100644 libobs-opengl/gl-nix.h
create mode 100644 libobs-opengl/gl-x11-glx.h
diff --git a/libobs-opengl/CMakeLists.txt b/libobs-opengl/CMakeLists.txt
index 776f1330..50afb923 100644
--- a/libobs-opengl/CMakeLists.txt
+++ b/libobs-opengl/CMakeLists.txt
@@ -49,6 +49,7 @@ else() #This needs to change to be more specific to get ready for Wayland
${X11_XCB_LIBRARIES})
set(libobs-opengl_PLATFORM_SOURCES
+ gl-nix.c
gl-x11-glx.c)
endif()
diff --git a/libobs-opengl/gl-nix.c b/libobs-opengl/gl-nix.c
new file mode 100644
index 00000000..574d4f77
--- /dev/null
+++ b/libobs-opengl/gl-nix.c
@@ -0,0 +1,107 @@
+/******************************************************************************
+ Copyright (C) 2019 by Jason Francis <cycl0ps@tuta.io>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+#include "gl-nix.h"
+#include "gl-x11-glx.h"
+
+static const struct gl_winsys_vtable *gl_vtable = NULL;
+
+static void init_winsys(void)
+{
+ assert(gl_vtable == NULL);
+
+ gl_vtable = gl_x11_glx_get_winsys_vtable();
+
+ assert(gl_vtable != NULL);
+}
+
+extern struct gl_windowinfo *
+gl_windowinfo_create(const struct gs_init_data *info)
+{
+ return gl_vtable->windowinfo_create(info);
+}
+
+extern void gl_windowinfo_destroy(struct gl_windowinfo *info)
+{
+ gl_vtable->windowinfo_destroy(info);
+}
+
+extern struct gl_platform *gl_platform_create(gs_device_t *device,
+ uint32_t adapter)
+{
+ init_winsys();
+
+ return gl_vtable->platform_create(device, adapter);
+}
+
+extern void gl_platform_destroy(struct gl_platform *plat)
+{
+ gl_vtable->platform_destroy(plat);
+
+ gl_vtable = NULL;
+}
+
+extern bool gl_platform_init_swapchain(struct gs_swap_chain *swap)
+{
+ return gl_vtable->platform_init_swapchain(swap);
+}
+
+extern void gl_platform_cleanup_swapchain(struct gs_swap_chain *swap)
+{
+ gl_vtable->platform_cleanup_swapchain(swap);
+}
+
+extern void device_enter_context(gs_device_t *device)
+{
+ gl_vtable->device_enter_context(device);
+}
+
+extern void device_leave_context(gs_device_t *device)
+{
+ gl_vtable->device_leave_context(device);
+}
+
+extern void *device_get_device_obj(gs_device_t *device)
+{
+ return gl_vtable->device_get_device_obj(device);
+}
+
+extern void gl_getclientsize(const struct gs_swap_chain *swap, uint32_t *width,
+ uint32_t *height)
+{
+ gl_vtable->getclientsize(swap, width, height);
+}
+
+extern void gl_clear_context(gs_device_t *device)
+{
+ gl_vtable->clear_context(device);
+}
+
+extern void gl_update(gs_device_t *device)
+{
+ gl_vtable->update(device);
+}
+
+extern void device_load_swapchain(gs_device_t *device, gs_swapchain_t *swap)
+{
+ gl_vtable->device_load_swapchain(device, swap);
+}
+
+extern void device_present(gs_device_t *device)
+{
+ gl_vtable->device_present(device);
+}
diff --git a/libobs-opengl/gl-nix.h b/libobs-opengl/gl-nix.h
new file mode 100644
index 00000000..209cc308
--- /dev/null
+++ b/libobs-opengl/gl-nix.h
@@ -0,0 +1,53 @@
+/******************************************************************************
+ Copyright (C) 2019 by Jason Francis <cycl0ps@tuta.io>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+#pragma once
+
+#include "gl-subsystem.h"
+
+struct gl_winsys_vtable {
+ struct gl_windowinfo *(*windowinfo_create)(
+ const struct gs_init_data *info);
+ void (*windowinfo_destroy)(struct gl_windowinfo *info);
+
+ struct gl_platform *(*platform_create)(gs_device_t *device,
+ uint32_t adapter);
+
+ void (*platform_destroy)(struct gl_platform *plat);
+
+ bool (*platform_init_swapchain)(struct gs_swap_chain *swap);
+
+ void (*platform_cleanup_swapchain)(struct gs_swap_chain *swap);
+
+ void (*device_enter_context)(gs_device_t *device);
+
+ void (*device_leave_context)(gs_device_t *device);
+
+ void *(*device_get_device_obj)(gs_device_t *device);
+
+ void (*getclientsize)(const struct gs_swap_chain *swap, uint32_t *width,
+ uint32_t *height);
+
+ void (*clear_context)(gs_device_t *device);
+
+ void (*update)(gs_device_t *device);
+
+ void (*device_load_swapchain)(gs_device_t *device,
+ gs_swapchain_t *swap);
+
+ void (*device_present)(gs_device_t *device);
+};
diff --git a/libobs-opengl/gl-x11-glx.c b/libobs-opengl/gl-x11-glx.c
index d04115b0..a562b564 100644
--- a/libobs-opengl/gl-x11-glx.c
+++ b/libobs-opengl/gl-x11-glx.c
@@ -36,7 +36,7 @@
#include <stdio.h>
-#include "gl-subsystem.h"
+#include "gl-nix.h"
#include <glad/glad_glx.h>
@@ -221,14 +221,14 @@ static void gl_context_destroy(struct gl_platform *plat)
bfree(plat);
}
-extern struct gl_windowinfo *
-gl_windowinfo_create(const struct gs_init_data *info)
+static struct gl_windowinfo *
+gl_x11_glx_windowinfo_create(const struct gs_init_data *info)
{
UNUSED_PARAMETER(info);
return bmalloc(sizeof(struct gl_windowinfo));
}
-extern void gl_windowinfo_destroy(struct gl_windowinfo *info)
+static void gl_x11_glx_windowinfo_destroy(struct gl_windowinfo *info)
{
bfree(info);
}
@@ -294,8 +294,8 @@ static int x_error_handler(Display *display, XErrorEvent *error)
return 0;
}
-extern struct gl_platform *gl_platform_create(gs_device_t *device,
- uint32_t adapter)
+static struct gl_platform *gl_x11_glx_platform_create(gs_device_t *device,
+ uint32_t adapter)
{
/* There's some trickery here... we're mixing libX11, xcb, and GLX
For an explanation see here: http://xcb.freedesktop.org/MixingCalls/
@@ -346,7 +346,7 @@ success:
return plat;
}
-extern void gl_platform_destroy(struct gl_platform *plat)
+static void gl_x11_glx_platform_destroy(struct gl_platform *plat)
{
if (!plat) /* In what case would platform be invalid here? */
return;
@@ -354,7 +354,7 @@ extern void gl_platform_destroy(struct gl_platform *plat)
gl_context_destroy(plat);
}
-extern bool gl_platform_init_swapchain(struct gs_swap_chain *swap)
+static bool gl_x11_glx_platform_init_swapchain(struct gs_swap_chain *swap)
{
Display *display = swap->device->plat->display;
xcb_connection_t *xcb_conn = XGetXCBConnection(display);
@@ -429,13 +429,13 @@ success:
return status;
}
-extern void gl_platform_cleanup_swapchain(struct gs_swap_chain *swap)
+static void gl_x11_glx_platform_cleanup_swapchain(struct gs_swap_chain *swap)
{
UNUSED_PARAMETER(swap);
/* Really nothing to clean up? */
}
-extern void device_enter_context(gs_device_t *device)
+static void gl_x11_glx_device_enter_context(gs_device_t *device)
{
GLXContext context = device->plat->context;
Display *display = device->plat->display;
@@ -453,7 +453,7 @@ extern void device_enter_context(gs_device_t *device)
}
}
-extern void device_leave_context(gs_device_t *device)
+static void gl_x11_glx_device_leave_context(gs_device_t *device)
{
Display *display = device->plat->display;
@@ -462,13 +462,13 @@ extern void device_leave_context(gs_device_t *device)
}
}
-void *device_get_device_obj(gs_device_t *device)
+static void *gl_x11_glx_device_get_device_obj(gs_device_t *device)
{
return device->plat->context;
}
-extern void gl_getclientsize(const struct gs_swap_chain *swap, uint32_t *width,
- uint32_t *height)
+static void gl_x11_glx_getclientsize(const struct gs_swap_chain *swap,
+ uint32_t *width, uint32_t *height)
{
xcb_connection_t *xcb_conn =
XGetXCBConnection(swap->device->plat->display);
@@ -484,7 +484,7 @@ extern void gl_getclientsize(const struct gs_swap_chain *swap, uint32_t *width,
free(geometry);
}
-extern void gl_clear_context(gs_device_t *device)
+static void gl_x11_glx_clear_context(gs_device_t *device)
{
Display *display = device->plat->display;
@@ -493,7 +493,7 @@ extern void gl_clear_context(gs_device_t *device)
}
}
-extern void gl_update(gs_device_t *device)
+static void gl_x11_glx_update(gs_device_t *device)
{
Display *display = device->plat->display;
xcb_window_t window = device->cur_swap->wi->window;
@@ -506,7 +506,8 @@ extern void gl_update(gs_device_t *device)
values);
}
-extern void device_load_swapchain(gs_device_t *device, gs_swapchain_t *swap)
+static void gl_x11_glx_device_load_swapchain(gs_device_t *device,
+ gs_swapchain_t *swap)
{
if (device->cur_swap == swap)
return;
@@ -536,7 +537,7 @@ enum swap_type {
SWAP_TYPE_SGI,
};
-extern void device_present(gs_device_t *device)
+static void gl_x11_glx_device_present(gs_device_t *device)
{
static bool initialized = false;
static enum swap_type swap_type = SWAP_TYPE_NORMAL;
@@ -577,3 +578,25 @@ extern void device_present(gs_device_t *device)
glXSwapBuffers(display, window);
}
+
+static const struct gl_winsys_vtable glx_winsys_vtable = {
+ .windowinfo_create = gl_x11_glx_windowinfo_create,
+ .windowinfo_destroy = gl_x11_glx_windowinfo_destroy,
+ .platform_create = gl_x11_glx_platform_create,
+ .platform_destroy = gl_x11_glx_platform_destroy,
+ .platform_init_swapchain = gl_x11_glx_platform_init_swapchain,
+ .platform_cleanup_swapchain = gl_x11_glx_platform_cleanup_swapchain,
+ .device_enter_context = gl_x11_glx_device_enter_context,
+ .device_leave_context = gl_x11_glx_device_leave_context,
+ .device_get_device_obj = gl_x11_glx_device_get_device_obj,
+ .getclientsize = gl_x11_glx_getclientsize,
+ .clear_context = gl_x11_glx_clear_context,
+ .update = gl_x11_glx_update,
+ .device_load_swapchain = gl_x11_glx_device_load_swapchain,
+ .device_present = gl_x11_glx_device_present,
+};
+
+const struct gl_winsys_vtable *gl_x11_glx_get_winsys_vtable(void)
+{
+ return &glx_winsys_vtable;
+}
diff --git a/libobs-opengl/gl-x11-glx.h b/libobs-opengl/gl-x11-glx.h
new file mode 100644
index 00000000..bdedf55c
--- /dev/null
+++ b/libobs-opengl/gl-x11-glx.h
@@ -0,0 +1,22 @@
+/******************************************************************************
+ Copyright (C) 2014 by Zachary Lund <admin@computerquip.com>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+#pragma once
+
+#include "gl-nix.h"
+
+const struct gl_winsys_vtable *gl_x11_glx_get_winsys_vtable(void);
--
2.28.0
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