obs-studio/libobs-opengl/gl-windows.c

610 lines
14 KiB
C

/******************************************************************************
Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.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/>.
******************************************************************************/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <util/darray.h>
#include "gl-subsystem.h"
#include <glad/glad_wgl.h>
/* Basically swapchain-specific information. Fortunately for windows this is
* super basic stuff */
struct gl_windowinfo {
HWND hwnd;
HDC hdc;
};
/* Like the other subsystems, the GL subsystem has one swap chain created by
* default. */
struct gl_platform {
HGLRC hrc;
struct gl_windowinfo window;
};
/* For now, only support basic 32bit formats for graphics output. */
static inline int get_color_format_bits(enum gs_color_format format)
{
switch ((uint32_t)format) {
case GS_RGBA:
case GS_BGRA:
return 32;
default:
return 0;
}
}
static inline int get_depth_format_bits(enum gs_zstencil_format zsformat)
{
switch ((uint32_t)zsformat) {
case GS_Z16:
return 16;
case GS_Z24_S8:
return 24;
default:
return 0;
}
}
static inline int get_stencil_format_bits(enum gs_zstencil_format zsformat)
{
switch ((uint32_t)zsformat) {
case GS_Z24_S8:
return 8;
default:
return 0;
}
}
/* would use designated initializers but Microsoft sort of sucks */
static inline void init_dummy_pixel_format(PIXELFORMATDESCRIPTOR *pfd)
{
memset(pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
pfd->nSize = sizeof(pfd);
pfd->nVersion = 1;
pfd->iPixelType = PFD_TYPE_RGBA;
pfd->cColorBits = 32;
pfd->cDepthBits = 24;
pfd->cStencilBits = 8;
pfd->iLayerType = PFD_MAIN_PLANE;
pfd->dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL |
PFD_DOUBLEBUFFER;
}
static const char *dummy_window_class = "GLDummyWindow";
static bool registered_dummy_window_class = false;
struct dummy_context {
HWND hwnd;
HGLRC hrc;
HDC hdc;
};
/* Need a dummy window for the dummy context */
static bool gl_register_dummy_window_class(void)
{
WNDCLASSA wc;
if (registered_dummy_window_class)
return true;
memset(&wc, 0, sizeof(wc));
wc.style = CS_OWNDC;
wc.hInstance = GetModuleHandle(NULL);
wc.lpfnWndProc = DefWindowProc;
wc.lpszClassName = dummy_window_class;
if (!RegisterClassA(&wc)) {
blog(LOG_ERROR, "Could not create dummy window class");
return false;
}
registered_dummy_window_class = true;
return true;
}
static inline HWND gl_create_dummy_window(void)
{
HWND hwnd = CreateWindowExA(0, dummy_window_class, "Dummy GL Window",
WS_POPUP, 0, 0, 2, 2, NULL, NULL,
GetModuleHandle(NULL), NULL);
if (!hwnd)
blog(LOG_ERROR, "Could not create dummy context window");
return hwnd;
}
static inline bool wgl_make_current(HDC hdc, HGLRC hglrc)
{
bool success = wglMakeCurrent(hdc, hglrc);
if (!success)
blog(LOG_ERROR,
"wglMakeCurrent failed, GetLastError "
"returned %lu",
GetLastError());
return success;
}
static inline HGLRC gl_init_basic_context(HDC hdc)
{
HGLRC hglrc = wglCreateContext(hdc);
if (!hglrc) {
blog(LOG_ERROR, "wglCreateContext failed, %lu", GetLastError());
return NULL;
}
if (!wgl_make_current(hdc, hglrc)) {
wglDeleteContext(hglrc);
return NULL;
}
return hglrc;
}
static inline HGLRC gl_init_context(HDC hdc)
{
static const int attribs[] = {
#ifdef _DEBUG
WGL_CONTEXT_FLAGS_ARB,
WGL_CONTEXT_DEBUG_BIT_ARB,
#endif
WGL_CONTEXT_PROFILE_MASK_ARB,
WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
WGL_CONTEXT_MAJOR_VERSION_ARB,
3,
WGL_CONTEXT_MINOR_VERSION_ARB,
3,
0,
0};
HGLRC hglrc = wglCreateContextAttribsARB(hdc, 0, attribs);
if (!hglrc) {
blog(LOG_ERROR,
"wglCreateContextAttribsARB failed, "
"%lu",
GetLastError());
return NULL;
}
if (!wgl_make_current(hdc, hglrc)) {
wglDeleteContext(hglrc);
return NULL;
}
return hglrc;
}
static bool gl_dummy_context_init(struct dummy_context *dummy)
{
PIXELFORMATDESCRIPTOR pfd;
int format_index;
if (!gl_register_dummy_window_class())
return false;
dummy->hwnd = gl_create_dummy_window();
if (!dummy->hwnd)
return false;
dummy->hdc = GetDC(dummy->hwnd);
init_dummy_pixel_format(&pfd);
format_index = ChoosePixelFormat(dummy->hdc, &pfd);
if (!format_index) {
blog(LOG_ERROR, "Dummy ChoosePixelFormat failed, %lu",
GetLastError());
return false;
}
if (!SetPixelFormat(dummy->hdc, format_index, &pfd)) {
blog(LOG_ERROR, "Dummy SetPixelFormat failed, %lu",
GetLastError());
return false;
}
dummy->hrc = gl_init_basic_context(dummy->hdc);
if (!dummy->hrc) {
blog(LOG_ERROR, "Failed to initialize dummy context");
return false;
}
return true;
}
static inline void gl_dummy_context_free(struct dummy_context *dummy)
{
wglMakeCurrent(NULL, NULL);
wglDeleteContext(dummy->hrc);
DestroyWindow(dummy->hwnd);
memset(dummy, 0, sizeof(struct dummy_context));
}
static inline void required_extension_error(const char *extension)
{
blog(LOG_ERROR, "OpenGL extension %s is required", extension);
}
static bool gl_init_extensions(HDC hdc)
{
if (!gladLoadWGL(hdc)) {
blog(LOG_ERROR, "Failed to load WGL entry functions.");
return false;
}
if (!GLAD_WGL_ARB_pixel_format) {
required_extension_error("ARB_pixel_format");
return false;
}
if (!GLAD_WGL_ARB_create_context) {
required_extension_error("ARB_create_context");
return false;
}
if (!GLAD_WGL_ARB_create_context_profile) {
required_extension_error("ARB_create_context_profile");
return false;
}
return true;
}
static inline void add_attrib(struct darray *list, int attrib, int val)
{
darray_push_back(sizeof(int), list, &attrib);
darray_push_back(sizeof(int), list, &val);
}
/* Creates the real pixel format for the target window */
static int gl_choose_pixel_format(HDC hdc, const struct gs_init_data *info)
{
struct darray attribs;
int color_bits = get_color_format_bits(info->format);
int depth_bits = get_depth_format_bits(info->zsformat);
int stencil_bits = get_stencil_format_bits(info->zsformat);
UINT num_formats;
BOOL success;
int format;
if (!color_bits) {
blog(LOG_ERROR, "gl_init_pixel_format: color format not "
"supported");
return false;
}
darray_init(&attribs);
add_attrib(&attribs, WGL_DRAW_TO_WINDOW_ARB, GL_TRUE);
add_attrib(&attribs, WGL_SUPPORT_OPENGL_ARB, GL_TRUE);
add_attrib(&attribs, WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB);
add_attrib(&attribs, WGL_DOUBLE_BUFFER_ARB, GL_TRUE);
add_attrib(&attribs, WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB);
add_attrib(&attribs, WGL_COLOR_BITS_ARB, color_bits);
add_attrib(&attribs, WGL_DEPTH_BITS_ARB, depth_bits);
add_attrib(&attribs, WGL_STENCIL_BITS_ARB, stencil_bits);
add_attrib(&attribs, 0, 0);
success = wglChoosePixelFormatARB(hdc, attribs.array, NULL, 1, &format,
&num_formats);
if (!success || !num_formats) {
blog(LOG_ERROR, "wglChoosePixelFormatARB failed, %lu",
GetLastError());
format = 0;
}
darray_free(&attribs);
return format;
}
static inline bool gl_getpixelformat(HDC hdc, const struct gs_init_data *info,
int *format, PIXELFORMATDESCRIPTOR *pfd)
{
if (!format)
return false;
*format = gl_choose_pixel_format(hdc, info);
if (!DescribePixelFormat(hdc, *format, sizeof(*pfd), pfd)) {
blog(LOG_ERROR, "DescribePixelFormat failed, %lu",
GetLastError());
return false;
}
return true;
}
static inline bool gl_setpixelformat(HDC hdc, int format,
PIXELFORMATDESCRIPTOR *pfd)
{
if (!SetPixelFormat(hdc, format, pfd)) {
blog(LOG_ERROR, "SetPixelFormat failed, %lu", GetLastError());
return false;
}
return true;
}
static struct gl_windowinfo *gl_windowinfo_bare(const struct gs_init_data *info)
{
struct gl_windowinfo *wi = bzalloc(sizeof(struct gl_windowinfo));
wi->hwnd = info->window.hwnd;
wi->hdc = GetDC(wi->hwnd);
if (!wi->hdc) {
blog(LOG_ERROR, "Unable to get device context from window");
bfree(wi);
return NULL;
}
return wi;
}
#define DUMMY_WNDCLASS "Dummy GL Window Class"
static bool register_dummy_class(void)
{
static bool created = false;
WNDCLASSA wc = {0};
wc.style = CS_OWNDC;
wc.hInstance = GetModuleHandleW(NULL);
wc.lpfnWndProc = (WNDPROC)DefWindowProcA;
wc.lpszClassName = DUMMY_WNDCLASS;
if (created)
return true;
if (!RegisterClassA(&wc)) {
blog(LOG_ERROR, "Failed to register dummy GL window class, %lu",
GetLastError());
return false;
}
created = true;
return true;
}
static bool create_dummy_window(struct gl_platform *plat)
{
plat->window.hwnd = CreateWindowExA(0, DUMMY_WNDCLASS,
"OpenGL Dummy Window", WS_POPUP, 0,
0, 1, 1, NULL, NULL,
GetModuleHandleW(NULL), NULL);
if (!plat->window.hwnd) {
blog(LOG_ERROR, "Failed to create dummy GL window, %lu",
GetLastError());
return false;
}
plat->window.hdc = GetDC(plat->window.hwnd);
if (!plat->window.hdc) {
blog(LOG_ERROR, "Failed to get dummy GL window DC (%lu)",
GetLastError());
return false;
}
return true;
}
static bool init_default_swap(struct gl_platform *plat, gs_device_t *device,
int pixel_format, PIXELFORMATDESCRIPTOR *pfd)
{
if (!gl_setpixelformat(plat->window.hdc, pixel_format, pfd))
return false;
return true;
}
void gl_update(gs_device_t *device)
{
/* does nothing on windows */
UNUSED_PARAMETER(device);
}
void gl_clear_context(gs_device_t *device)
{
UNUSED_PARAMETER(device);
wglMakeCurrent(NULL, NULL);
}
static void init_dummy_swap_info(struct gs_init_data *info)
{
info->format = GS_RGBA;
info->zsformat = GS_ZS_NONE;
}
struct gl_platform *gl_platform_create(gs_device_t *device, uint32_t adapter)
{
struct gl_platform *plat = bzalloc(sizeof(struct gl_platform));
struct dummy_context dummy;
struct gs_init_data info = {0};
int pixel_format;
PIXELFORMATDESCRIPTOR pfd;
memset(&dummy, 0, sizeof(struct dummy_context));
init_dummy_swap_info(&info);
if (!gl_dummy_context_init(&dummy))
goto fail;
if (!gl_init_extensions(dummy.hdc))
goto fail;
if (!register_dummy_class())
return false;
if (!create_dummy_window(plat))
return false;
/* you have to have a dummy context open before you can actually
* use wglChoosePixelFormatARB */
if (!gl_getpixelformat(dummy.hdc, &info, &pixel_format, &pfd))
goto fail;
gl_dummy_context_free(&dummy);
if (!init_default_swap(plat, device, pixel_format, &pfd))
goto fail;
plat->hrc = gl_init_context(plat->window.hdc);
if (!plat->hrc)
goto fail;
if (!gladLoadGL()) {
blog(LOG_ERROR, "Failed to initialize OpenGL entry functions.");
goto fail;
}
UNUSED_PARAMETER(adapter);
return plat;
fail:
blog(LOG_ERROR, "gl_platform_create failed");
gl_platform_destroy(plat);
gl_dummy_context_free(&dummy);
return NULL;
}
void gl_platform_destroy(struct gl_platform *plat)
{
if (plat) {
if (plat->hrc) {
wglMakeCurrent(NULL, NULL);
wglDeleteContext(plat->hrc);
}
if (plat->window.hdc)
ReleaseDC(plat->window.hwnd, plat->window.hdc);
if (plat->window.hwnd)
DestroyWindow(plat->window.hwnd);
bfree(plat);
}
}
bool gl_platform_init_swapchain(struct gs_swap_chain *swap)
{
UNUSED_PARAMETER(swap);
return true;
}
void gl_platform_cleanup_swapchain(struct gs_swap_chain *swap)
{
UNUSED_PARAMETER(swap);
}
struct gl_windowinfo *gl_windowinfo_create(const struct gs_init_data *info)
{
struct gl_windowinfo *wi = gl_windowinfo_bare(info);
PIXELFORMATDESCRIPTOR pfd;
int pixel_format;
if (!wi)
return NULL;
if (!gl_getpixelformat(wi->hdc, info, &pixel_format, &pfd))
goto fail;
if (!gl_setpixelformat(wi->hdc, pixel_format, &pfd))
goto fail;
return wi;
fail:
blog(LOG_ERROR, "gl_windowinfo_create failed");
gl_windowinfo_destroy(wi);
return NULL;
}
void gl_windowinfo_destroy(struct gl_windowinfo *wi)
{
if (wi) {
if (wi->hdc)
ReleaseDC(wi->hwnd, wi->hdc);
bfree(wi);
}
}
void device_enter_context(gs_device_t *device)
{
HDC hdc = device->plat->window.hdc;
if (device->cur_swap)
hdc = device->cur_swap->wi->hdc;
if (!wgl_make_current(hdc, device->plat->hrc))
blog(LOG_ERROR, "device_enter_context (GL) failed");
}
void device_leave_context(gs_device_t *device)
{
UNUSED_PARAMETER(device);
wglMakeCurrent(NULL, NULL);
}
void *device_get_device_obj(gs_device_t *device)
{
return device->plat->hrc;
}
void device_load_swapchain(gs_device_t *device, gs_swapchain_t *swap)
{
HDC hdc = device->plat->window.hdc;
if (device->cur_swap == swap)
return;
device->cur_swap = swap;
if (swap)
hdc = swap->wi->hdc;
if (hdc) {
if (!wgl_make_current(hdc, device->plat->hrc))
blog(LOG_ERROR, "device_load_swapchain (GL) failed");
}
}
void device_present(gs_device_t *device)
{
if (!SwapBuffers(device->cur_swap->wi->hdc)) {
blog(LOG_ERROR,
"SwapBuffers failed, GetLastError "
"returned %lu",
GetLastError());
blog(LOG_ERROR, "device_present (GL) failed");
}
}
extern void gl_getclientsize(const struct gs_swap_chain *swap, uint32_t *width,
uint32_t *height)
{
RECT rc;
if (swap) {
GetClientRect(swap->wi->hwnd, &rc);
*width = rc.right;
*height = rc.bottom;
} else {
*width = 0;
*height = 0;
}
}
EXPORT bool device_gdi_texture_available(void)
{
return false;
}
EXPORT bool device_shared_texture_available(void)
{
return false;
}