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SDL_video.c
2675 lines (2340 loc) · 66.9 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* The high-level video driver subsystem */
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#include "SDL.h"
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
#include "SDL_blit.h"
#include "SDL_pixels_c.h"
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#include "SDL_rect_c.h"
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#include "../events/SDL_events_c.h"
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#if SDL_VIDEO_OPENGL
#include "SDL_opengl.h"
#endif /* SDL_VIDEO_OPENGL */
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#if SDL_VIDEO_OPENGL_ES
#include "SDL_opengles.h"
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#endif /* SDL_VIDEO_OPENGL_ES */
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#if SDL_VIDEO_OPENGL_ES2
#include "SDL_opengles2.h"
#endif /* SDL_VIDEO_OPENGL_ES2 */
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#include "SDL_syswm.h"
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/* On Windows, windows.h defines CreateWindow */
#ifdef CreateWindow
#undef CreateWindow
#endif
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/* Available video drivers */
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static VideoBootStrap *bootstrap[] = {
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#if SDL_VIDEO_DRIVER_COCOA
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&COCOA_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_X11
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&X11_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_DIRECTFB
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&DirectFB_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_WINDOWS
&WINDOWS_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_BWINDOW
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&BWINDOW_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_PANDORA
&PND_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_NDS
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&NDS_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_UIKIT
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&UIKIT_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_ANDROID
&Android_bootstrap,
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#endif
#if SDL_VIDEO_DRIVER_DUMMY
&DUMMY_bootstrap,
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#endif
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NULL
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};
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static SDL_VideoDevice *_this = NULL;
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#define CHECK_WINDOW_MAGIC(window, retval) \
if (!_this) { \
SDL_UninitializedVideo(); \
return retval; \
} \
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if (!window || window->magic != &_this->window_magic) { \
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SDL_SetError("Invalid window"); \
return retval; \
}
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#define CHECK_DISPLAY_INDEX(displayIndex, retval) \
if (!_this) { \
SDL_UninitializedVideo(); \
return retval; \
} \
if (displayIndex < 0 || displayIndex >= _this->num_displays) { \
SDL_SetError("displayIndex must be in the range 0 - %d", \
_this->num_displays - 1); \
return retval; \
}
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/* Support for framebuffer emulation using an accelerated renderer */
#define SDL_WINDOWTEXTUREDATA "_SDL_WindowTextureData"
typedef struct {
SDL_Renderer *renderer;
SDL_Texture *texture;
void *pixels;
int pitch;
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int bytes_per_pixel;
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} SDL_WindowTextureData;
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static SDL_bool
ShouldUseTextureFramebuffer()
{
const char *hint;
/* If there's no native framebuffer support then there's no option */
if (!_this->CreateWindowFramebuffer) {
return SDL_TRUE;
}
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/* If the user has specified a software renderer we can't use a
texture framebuffer, or renderer creation will go recursive.
*/
hint = SDL_GetHint(SDL_HINT_RENDER_DRIVER);
if (hint && SDL_strcasecmp(hint, "software") == 0) {
return SDL_FALSE;
}
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/* See if the user or application wants a specific behavior */
hint = SDL_GetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION);
if (hint) {
if (*hint == '0') {
return SDL_FALSE;
} else {
return SDL_TRUE;
}
}
/* Each platform has different performance characteristics */
#if defined(__WIN32__)
/* GDI BitBlt() is way faster than Direct3D dynamic textures right now.
*/
return SDL_FALSE;
#elif defined(__MACOSX__)
/* Mac OS X uses OpenGL as the native fast path */
return SDL_TRUE;
#elif defined(__LINUX__)
/* Properly configured OpenGL drivers are faster than MIT-SHM */
#if SDL_VIDEO_OPENGL
/* Ugh, find a way to cache this value! */
{
SDL_Window *window;
SDL_GLContext context;
SDL_bool hasAcceleratedOpenGL = SDL_FALSE;
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window = SDL_CreateWindow("OpenGL test", -32, -32, 32, 32, SDL_WINDOW_OPENGL|SDL_WINDOW_HIDDEN);
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if (window) {
context = SDL_GL_CreateContext(window);
if (context) {
const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
const char *vendor = NULL;
glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
if (glGetStringFunc) {
vendor = (const char *) glGetStringFunc(GL_VENDOR);
}
/* Add more vendors here at will... */
if (vendor &&
(SDL_strstr(vendor, "ATI Technologies") ||
SDL_strstr(vendor, "NVIDIA"))) {
hasAcceleratedOpenGL = SDL_TRUE;
}
SDL_GL_DeleteContext(context);
}
SDL_DestroyWindow(window);
}
return hasAcceleratedOpenGL;
}
#else
return SDL_FALSE;
#endif
#else
/* Play it safe, assume that if there is a framebuffer driver that it's
optimized for the current platform.
*/
return SDL_FALSE;
#endif
}
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static int
SDL_CreateWindowTexture(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
{
SDL_WindowTextureData *data;
SDL_RendererInfo info;
Uint32 i;
data = SDL_GetWindowData(window, SDL_WINDOWTEXTUREDATA);
if (!data) {
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SDL_Renderer *renderer = NULL;
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SDL_RendererInfo info;
int i;
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const char *hint = SDL_GetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION);
/* Check to see if there's a specific driver requested */
if (hint && *hint != '0' && *hint != '1' &&
SDL_strcasecmp(hint, "software") != 0) {
for (i = 0; i < SDL_GetNumRenderDrivers(); ++i) {
SDL_GetRenderDriverInfo(i, &info);
if (SDL_strcasecmp(info.name, hint) == 0) {
renderer = SDL_CreateRenderer(window, i, 0);
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break;
}
}
}
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if (!renderer) {
for (i = 0; i < SDL_GetNumRenderDrivers(); ++i) {
SDL_GetRenderDriverInfo(i, &info);
if (SDL_strcmp(info.name, "software") != 0) {
renderer = SDL_CreateRenderer(window, i, 0);
if (renderer) {
break;
}
}
}
}
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if (!renderer) {
return -1;
}
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/* Create the data after we successfully create the renderer (bug #1116) */
data = (SDL_WindowTextureData *)SDL_calloc(1, sizeof(*data));
if (!data) {
SDL_DestroyRenderer(renderer);
SDL_OutOfMemory();
return -1;
}
SDL_SetWindowData(window, SDL_WINDOWTEXTUREDATA, data);
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data->renderer = renderer;
}
/* Free any old texture and pixel data */
if (data->texture) {
SDL_DestroyTexture(data->texture);
data->texture = NULL;
}
if (data->pixels) {
SDL_free(data->pixels);
data->pixels = NULL;
}
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if (SDL_GetRendererInfo(data->renderer, &info) < 0) {
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return -1;
}
/* Find the first format without an alpha channel */
*format = info.texture_formats[0];
for (i = 0; i < info.num_texture_formats; ++i) {
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if (!SDL_ISPIXELFORMAT_FOURCC(info.texture_formats[i]) &&
!SDL_ISPIXELFORMAT_ALPHA(info.texture_formats[i])) {
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*format = info.texture_formats[i];
break;
}
}
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data->texture = SDL_CreateTexture(data->renderer, *format,
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SDL_TEXTUREACCESS_STREAMING,
window->w, window->h);
if (!data->texture) {
return -1;
}
/* Create framebuffer data */
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data->bytes_per_pixel = SDL_BYTESPERPIXEL(*format);
data->pitch = (((window->w * data->bytes_per_pixel) + 3) & ~3);
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data->pixels = SDL_malloc(window->h * data->pitch);
if (!data->pixels) {
SDL_OutOfMemory();
return -1;
}
*pixels = data->pixels;
*pitch = data->pitch;
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/* Make sure we're not double-scaling the viewport */
SDL_RenderSetViewport(data->renderer, NULL);
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return 0;
}
static int
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SDL_UpdateWindowTexture(_THIS, SDL_Window * window, SDL_Rect * rects, int numrects)
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{
SDL_WindowTextureData *data;
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SDL_Rect rect;
void *src;
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data = SDL_GetWindowData(window, SDL_WINDOWTEXTUREDATA);
if (!data || !data->texture) {
SDL_SetError("No window texture data");
return -1;
}
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/* Update a single rect that contains subrects for best DMA performance */
if (SDL_GetSpanEnclosingRect(window->w, window->h, numrects, rects, &rect)) {
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src = (void *)((Uint8 *)data->pixels +
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rect.y * data->pitch +
rect.x * data->bytes_per_pixel);
if (SDL_UpdateTexture(data->texture, &rect, src, data->pitch) < 0) {
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return -1;
}
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if (SDL_RenderCopy(data->renderer, data->texture, NULL, NULL) < 0) {
return -1;
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}
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SDL_RenderPresent(data->renderer);
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}
return 0;
}
static void
SDL_DestroyWindowTexture(_THIS, SDL_Window * window)
{
SDL_WindowTextureData *data;
data = SDL_SetWindowData(window, SDL_WINDOWTEXTUREDATA, NULL);
if (!data) {
return;
}
if (data->texture) {
SDL_DestroyTexture(data->texture);
}
if (data->renderer) {
SDL_DestroyRenderer(data->renderer);
}
if (data->pixels) {
SDL_free(data->pixels);
}
SDL_free(data);
}
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static int
cmpmodes(const void *A, const void *B)
{
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SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
SDL_DisplayMode b = *(const SDL_DisplayMode *) B;
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if (a.w != b.w) {
return b.w - a.w;
}
if (a.h != b.h) {
return b.h - a.h;
}
if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
}
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if (SDL_PIXELLAYOUT(a.format) != SDL_PIXELLAYOUT(b.format)) {
return SDL_PIXELLAYOUT(b.format) - SDL_PIXELLAYOUT(a.format);
}
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if (a.refresh_rate != b.refresh_rate) {
return b.refresh_rate - a.refresh_rate;
}
return 0;
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}
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static void
SDL_UninitializedVideo()
{
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SDL_SetError("Video subsystem has not been initialized");
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}
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int
SDL_GetNumVideoDrivers(void)
{
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return SDL_arraysize(bootstrap) - 1;
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}
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const char *
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SDL_GetVideoDriver(int index)
{
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if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
return bootstrap[index]->name;
}
return NULL;
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}
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/*
* Initialize the video and event subsystems -- determine native pixel format
*/
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int
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SDL_VideoInit(const char *driver_name)
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{
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SDL_VideoDevice *video;
int index;
int i;
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/* Check to make sure we don't overwrite '_this' */
if (_this != NULL) {
SDL_VideoQuit();
}
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/* Start the event loop */
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if (SDL_StartEventLoop() < 0 ||
SDL_KeyboardInit() < 0 ||
SDL_MouseInit() < 0 ||
SDL_TouchInit() < 0 ||
SDL_QuitInit() < 0) {
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return -1;
}
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/* Select the proper video driver */
index = 0;
video = NULL;
if (driver_name == NULL) {
driver_name = SDL_getenv("SDL_VIDEODRIVER");
}
if (driver_name != NULL) {
for (i = 0; bootstrap[i]; ++i) {
if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
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video = bootstrap[i]->create(index);
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break;
}
}
} else {
for (i = 0; bootstrap[i]; ++i) {
if (bootstrap[i]->available()) {
video = bootstrap[i]->create(index);
if (video != NULL) {
break;
}
}
}
}
if (video == NULL) {
if (driver_name) {
SDL_SetError("%s not available", driver_name);
} else {
SDL_SetError("No available video device");
}
return -1;
}
_this = video;
_this->name = bootstrap[i]->name;
_this->next_object_id = 1;
/* Set some very sane GL defaults */
_this->gl_config.driver_loaded = 0;
_this->gl_config.dll_handle = NULL;
_this->gl_config.red_size = 3;
_this->gl_config.green_size = 3;
_this->gl_config.blue_size = 2;
_this->gl_config.alpha_size = 0;
_this->gl_config.buffer_size = 0;
_this->gl_config.depth_size = 16;
_this->gl_config.stencil_size = 0;
_this->gl_config.double_buffer = 1;
_this->gl_config.accum_red_size = 0;
_this->gl_config.accum_green_size = 0;
_this->gl_config.accum_blue_size = 0;
_this->gl_config.accum_alpha_size = 0;
_this->gl_config.stereo = 0;
_this->gl_config.multisamplebuffers = 0;
_this->gl_config.multisamplesamples = 0;
_this->gl_config.retained_backing = 1;
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_this->gl_config.accelerated = -1; /* accelerated or not, both are fine */
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#if SDL_VIDEO_OPENGL
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_this->gl_config.major_version = 2;
_this->gl_config.minor_version = 1;
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#elif SDL_VIDEO_OPENGL_ES
_this->gl_config.major_version = 1;
_this->gl_config.minor_version = 1;
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#elif SDL_VIDEO_OPENGL_ES2
_this->gl_config.major_version = 2;
_this->gl_config.minor_version = 0;
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#endif
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/* Initialize the video subsystem */
if (_this->VideoInit(_this) < 0) {
SDL_VideoQuit();
return -1;
}
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/* Make sure some displays were added */
if (_this->num_displays == 0) {
SDL_SetError("The video driver did not add any displays");
SDL_VideoQuit();
return (-1);
}
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/* Add the renderer framebuffer emulation if desired */
if (ShouldUseTextureFramebuffer()) {
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_this->CreateWindowFramebuffer = SDL_CreateWindowTexture;
_this->UpdateWindowFramebuffer = SDL_UpdateWindowTexture;
_this->DestroyWindowFramebuffer = SDL_DestroyWindowTexture;
}
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/* We're ready to go! */
return 0;
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}
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const char *
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SDL_GetCurrentVideoDriver()
{
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if (!_this) {
SDL_UninitializedVideo();
return NULL;
}
return _this->name;
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}
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SDL_VideoDevice *
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SDL_GetVideoDevice(void)
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{
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return _this;
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}
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int
SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
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{
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SDL_VideoDisplay display;
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SDL_zero(display);
if (desktop_mode) {
display.desktop_mode = *desktop_mode;
}
display.current_mode = display.desktop_mode;
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return SDL_AddVideoDisplay(&display);
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}
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int
SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
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{
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SDL_VideoDisplay *displays;
int index = -1;
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displays =
SDL_realloc(_this->displays,
(_this->num_displays + 1) * sizeof(*displays));
if (displays) {
index = _this->num_displays++;
displays[index] = *display;
displays[index].device = _this;
_this->displays = displays;
} else {
SDL_OutOfMemory();
}
return index;
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}
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int
SDL_GetNumVideoDisplays(void)
{
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if (!_this) {
SDL_UninitializedVideo();
return 0;
}
return _this->num_displays;
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}
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int
SDL_GetIndexOfDisplay(SDL_VideoDisplay *display)
{
int displayIndex;
for (displayIndex = 0; displayIndex < _this->num_displays; ++displayIndex) {
if (display == &_this->displays[displayIndex]) {
return displayIndex;
}
}
/* Couldn't find the display, just use index 0 */
return 0;
}
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int
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SDL_GetDisplayBounds(int displayIndex, SDL_Rect * rect)
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{
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CHECK_DISPLAY_INDEX(displayIndex, -1);
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if (rect) {
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SDL_VideoDisplay *display = &_this->displays[displayIndex];
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if (_this->GetDisplayBounds) {
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if (_this->GetDisplayBounds(_this, display, rect) == 0) {
return 0;
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}
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}
/* Assume that the displays are left to right */
if (displayIndex == 0) {
rect->x = 0;
rect->y = 0;
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} else {
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SDL_GetDisplayBounds(displayIndex-1, rect);
rect->x += rect->w;
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}
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rect->w = display->desktop_mode.w;
rect->h = display->desktop_mode.h;
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}
return 0;
}
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SDL_bool
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SDL_AddDisplayMode(SDL_VideoDisplay * display, const SDL_DisplayMode * mode)
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{
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SDL_DisplayMode *modes;
int i, nmodes;
/* Make sure we don't already have the mode in the list */
modes = display->display_modes;
nmodes = display->num_display_modes;
for (i = nmodes; i--;) {
if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
return SDL_FALSE;
}
}
/* Go ahead and add the new mode */
if (nmodes == display->max_display_modes) {
modes =
SDL_realloc(modes,
(display->max_display_modes + 32) * sizeof(*modes));
if (!modes) {
return SDL_FALSE;
}
display->display_modes = modes;
display->max_display_modes += 32;
}
modes[nmodes] = *mode;
display->num_display_modes++;
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/* Re-sort video modes */
SDL_qsort(display->display_modes, display->num_display_modes,
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sizeof(SDL_DisplayMode), cmpmodes);
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return SDL_TRUE;
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}
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SDL_VideoDisplay *
SDL_GetFirstDisplay(void)
{
return &_this->displays[0];
}
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static int
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SDL_GetNumDisplayModesForDisplay(SDL_VideoDisplay * display)
{
if (!display->num_display_modes && _this->GetDisplayModes) {
_this->GetDisplayModes(_this, display);
SDL_qsort(display->display_modes, display->num_display_modes,
sizeof(SDL_DisplayMode), cmpmodes);
}
return display->num_display_modes;
}
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int
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SDL_GetNumDisplayModes(int displayIndex)
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{
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CHECK_DISPLAY_INDEX(displayIndex, -1);
return SDL_GetNumDisplayModesForDisplay(&_this->displays[displayIndex]);
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}
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int
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SDL_GetDisplayMode(int displayIndex, int index, SDL_DisplayMode * mode)
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{
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SDL_VideoDisplay *display;
CHECK_DISPLAY_INDEX(displayIndex, -1);
display = &_this->displays[displayIndex];
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if (index < 0 || index >= SDL_GetNumDisplayModesForDisplay(display)) {
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SDL_SetError("index must be in the range of 0 - %d",
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SDL_GetNumDisplayModesForDisplay(display) - 1);
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return -1;
}
if (mode) {
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703
*mode = display->display_modes[index];
}
return 0;
}
int
704
SDL_GetDesktopDisplayMode(int displayIndex, SDL_DisplayMode * mode)
705
{
706
SDL_VideoDisplay *display;
707
708
709
710
CHECK_DISPLAY_INDEX(displayIndex, -1);
display = &_this->displays[displayIndex];
711
712
if (mode) {
*mode = display->desktop_mode;
713
714
}
return 0;
715
716
}
717
int
718
SDL_GetCurrentDisplayMode(int displayIndex, SDL_DisplayMode * mode)
719
{
720
SDL_VideoDisplay *display;
721
722
723
724
CHECK_DISPLAY_INDEX(displayIndex, -1);
display = &_this->displays[displayIndex];
725
if (mode) {
726
*mode = display->current_mode;
727
728
}
return 0;
729
}
730
731
static SDL_DisplayMode *
732
733
734
SDL_GetClosestDisplayModeForDisplay(SDL_VideoDisplay * display,
const SDL_DisplayMode * mode,
SDL_DisplayMode * closest)
735
736
737
738
739
740
{
Uint32 target_format;
int target_refresh_rate;
int i;
SDL_DisplayMode *current, *match;
741
742
if (!mode || !closest) {
SDL_SetError("Missing desired mode or closest mode parameter");
743
744
return NULL;
}
745
746
747
748
749
/* Default to the desktop format */
if (mode->format) {
target_format = mode->format;
} else {
750
target_format = display->desktop_mode.format;
751
752
753
754
755
756
}
/* Default to the desktop refresh rate */
if (mode->refresh_rate) {
target_refresh_rate = mode->refresh_rate;
} else {
757
target_refresh_rate = display->desktop_mode.refresh_rate;
758
759
760
}
match = NULL;
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762
for (i = 0; i < SDL_GetNumDisplayModesForDisplay(display); ++i) {
current = &display->display_modes[i];
763
764
if (current->w && (current->w < mode->w)) {
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766
767
/* Out of sorted modes large enough here */
break;
}
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769
770
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772
773
774
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777
if (current->h && (current->h < mode->h)) {
if (current->w && (current->w == mode->w)) {
/* Out of sorted modes large enough here */
break;
}
/* Wider, but not tall enough, due to a different
aspect ratio. This mode must be skipped, but closer
modes may still follow. */
continue;
}
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780
781
782
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784
785
786
787
788
789
790
791
792
793
794
795
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799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
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833
834
835
if (!match || current->w < match->w || current->h < match->h) {
match = current;
continue;
}
if (current->format != match->format) {
/* Sorted highest depth to lowest */
if (current->format == target_format ||
(SDL_BITSPERPIXEL(current->format) >=
SDL_BITSPERPIXEL(target_format)
&& SDL_PIXELTYPE(current->format) ==
SDL_PIXELTYPE(target_format))) {
match = current;
}
continue;
}
if (current->refresh_rate != match->refresh_rate) {
/* Sorted highest refresh to lowest */
if (current->refresh_rate >= target_refresh_rate) {
match = current;
}
}
}
if (match) {
if (match->format) {
closest->format = match->format;
} else {
closest->format = mode->format;
}
if (match->w && match->h) {
closest->w = match->w;
closest->h = match->h;
} else {
closest->w = mode->w;
closest->h = mode->h;
}
if (match->refresh_rate) {
closest->refresh_rate = match->refresh_rate;
} else {
closest->refresh_rate = mode->refresh_rate;
}
closest->driverdata = match->driverdata;
/*
* Pick some reasonable defaults if the app and driver don't
* care
*/
if (!closest->format) {
closest->format = SDL_PIXELFORMAT_RGB888;
}
if (!closest->w) {
closest->w = 640;
}
if (!closest->h) {
closest->h = 480;
}
return closest;
}
return NULL;
836
}
837
838
SDL_DisplayMode *
839
840
SDL_GetClosestDisplayMode(int displayIndex,
const SDL_DisplayMode * mode,
841
842
SDL_DisplayMode * closest)
{
843
844
845
846
847
848
SDL_VideoDisplay *display;
CHECK_DISPLAY_INDEX(displayIndex, NULL);
display = &_this->displays[displayIndex];
return SDL_GetClosestDisplayModeForDisplay(display, mode, closest);
849
850
}
851
int
852
SDL_SetDisplayModeForDisplay(SDL_VideoDisplay * display, const SDL_DisplayMode * mode)
853
{
854
855
856
SDL_DisplayMode display_mode;
SDL_DisplayMode current_mode;
857
858
if (mode) {
display_mode = *mode;
859
860
861
862
863
864
865
866
867
868
869
870
871
872
/* Default to the current mode */
if (!display_mode.format) {
display_mode.format = display->current_mode.format;
}
if (!display_mode.w) {
display_mode.w = display->current_mode.w;
}
if (!display_mode.h) {
display_mode.h = display->current_mode.h;
}
if (!display_mode.refresh_rate) {
display_mode.refresh_rate = display->current_mode.refresh_rate;
}
873
874
875
876
877
878
879
880
881
/* Get a good video mode, the closest one possible */
if (!SDL_GetClosestDisplayModeForDisplay(display, &display_mode, &display_mode)) {
SDL_SetError("No video mode large enough for %dx%d",
display_mode.w, display_mode.h);
return -1;
}
} else {
display_mode = display->desktop_mode;
882
}
883
884
/* See if there's anything left to do */
885
current_mode = display->current_mode;
886
887
888
if (SDL_memcmp(&display_mode, ¤t_mode, sizeof(display_mode)) == 0) {
return 0;
}
889
890
/* Actually change the display mode */
891
892
893
894
if (!_this->SetDisplayMode) {
SDL_SetError("Video driver doesn't support changing display mode");
return -1;
}
895
if (_this->SetDisplayMode(_this, display, &display_mode) < 0) {
896
897
898
899
return -1;
}
display->current_mode = display_mode;
return 0;
900
901
}
902
int
903
SDL_GetWindowDisplay(SDL_Window * window)
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
{
int displayIndex;
int i, dist;
int closest = -1;
int closest_dist = 0x7FFFFFFF;
SDL_Point center;
SDL_Point delta;
SDL_Rect rect;
CHECK_WINDOW_MAGIC(window, -1);
if (SDL_WINDOWPOS_ISUNDEFINED(window->x) ||
SDL_WINDOWPOS_ISCENTERED(window->x)) {
displayIndex = (window->x & 0xFFFF);
if (displayIndex >= _this->num_displays) {
displayIndex = 0;
}
return displayIndex;
}
if (SDL_WINDOWPOS_ISUNDEFINED(window->y) ||
SDL_WINDOWPOS_ISCENTERED(window->y)) {
displayIndex = (window->y & 0xFFFF);
if (displayIndex >= _this->num_displays) {
displayIndex = 0;
}
return displayIndex;
}
/* Find the display containing the window */
center.x = window->x + window->w / 2;
center.y = window->y + window->h / 2;
for (i = 0; i < _this->num_displays; ++i) {
SDL_VideoDisplay *display = &_this->displays[i];
SDL_GetDisplayBounds(i, &rect);
if (display->fullscreen_window == window || SDL_EnclosePoints(¢er, 1, &rect, NULL)) {
return i;
}
delta.x = center.x - (rect.x + rect.w / 2);
delta.y = center.y - (rect.y + rect.h / 2);
dist = (delta.x*delta.x + delta.y*delta.y);
if (dist < closest_dist) {
closest = i;
closest_dist = dist;
}
}
if (closest < 0) {
SDL_SetError("Couldn't find any displays");
}
return closest;
}
SDL_VideoDisplay *
SDL_GetDisplayForWindow(SDL_Window *window)
{
960
961
962
963
964
965
int displayIndex = SDL_GetWindowDisplay(window);
if (displayIndex >= 0) {
return &_this->displays[displayIndex];
} else {
return NULL;
}
966
967
}
968
int
969
SDL_SetWindowDisplayMode(SDL_Window * window, const SDL_DisplayMode * mode)
970
{
971
CHECK_WINDOW_MAGIC(window, -1);
972
973
974
975
976
if (mode) {
window->fullscreen_mode = *mode;
} else {
SDL_zero(window->fullscreen_mode);
977
}
978
return 0;
979
980
}
981
int
982
SDL_GetWindowDisplayMode(SDL_Window * window, SDL_DisplayMode * mode)
983
{
984
985
SDL_DisplayMode fullscreen_mode;
986
CHECK_WINDOW_MAGIC(window, -1);
987
988
989
990
991
992
993
994
995
fullscreen_mode = window->fullscreen_mode;
if (!fullscreen_mode.w) {
fullscreen_mode.w = window->w;
}
if (!fullscreen_mode.h) {
fullscreen_mode.h = window->h;
}
996
if (!SDL_GetClosestDisplayModeForDisplay(SDL_GetDisplayForWindow(window),
997
998
999
1000
&fullscreen_mode,
&fullscreen_mode)) {
SDL_SetError("Couldn't find display mode match");
return -1;