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Added support for SDL_RENDERER_PRESENTVSYNC to the software renderer

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This fixes https://github.com/libsdl-org/SDL/issues/4612
This commit is contained in:
Sam Lantinga 2021-08-10 12:02:17 -07:00
parent ea9bece5ed
commit fcfd19db86
3 changed files with 50 additions and 36 deletions
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3
src/render/SDL_render.c
View File

@ -833,7 +833,8 @@ SDL_CreateRenderer(SDL_Window * window, int index, Uint32 flags)
goto error;
}
if (SDL_GetHint(SDL_HINT_RENDER_VSYNC)) {
hint = SDL_GetHint(SDL_HINT_RENDER_VSYNC);
if (hint && *hint) {
if (SDL_GetHintBoolean(SDL_HINT_RENDER_VSYNC, SDL_TRUE)) {
flags |= SDL_RENDERER_PRESENTVSYNC;
} else {

15
src/render/software/SDL_render_sw.c
View File

@ -859,9 +859,22 @@ SW_CreateRendererForSurface(SDL_Surface * surface)
static SDL_Renderer *
SW_CreateRenderer(SDL_Window * window, Uint32 flags)
{
const char *hint;
SDL_Surface *surface;
/* Set the vsync hint based on our flags, if it's not already set */
hint = SDL_GetHint(SDL_HINT_RENDER_VSYNC);
if (!hint || !*hint) {
SDL_SetHint(SDL_HINT_RENDER_VSYNC, (flags & SDL_RENDERER_PRESENTVSYNC) ? "1" : "0");
}
surface = SDL_GetWindowSurface(window);
/* Reset the vsync hint if we set it above */
if (!hint || !*hint) {
SDL_SetHint(SDL_HINT_RENDER_VSYNC, "");
}
if (!surface) {
return NULL;
}
@ -872,7 +885,7 @@ SDL_RenderDriver SW_RenderDriver = {
SW_CreateRenderer,
{
"software",
SDL_RENDERER_SOFTWARE | SDL_RENDERER_TARGETTEXTURE,
SDL_RENDERER_SOFTWARE | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE,
8,
{
SDL_PIXELFORMAT_ARGB8888,

92
src/video/SDL_video.c
View File

@ -172,53 +172,9 @@ typedef struct {
int bytes_per_pixel;
} SDL_WindowTextureData;
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;
}
/* If this is the dummy driver there is no texture support */
if (_this->is_dummy) {
return SDL_FALSE;
}
/* 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;
}
/* See if the user or application wants a specific behavior */
hint = SDL_GetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION);
if (hint) {
if (*hint == '0' || SDL_strcasecmp(hint, "false") == 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 (for cocoa and X11) */
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! */
static SDL_bool
HasAcceleratedOpenGL()
{
SDL_Window *window;
SDL_GLContext context;
@ -247,6 +203,50 @@ ShouldUseTextureFramebuffer()
}
return hasAcceleratedOpenGL;
}
#endif /* SDL_VIDEO_OPENGL */
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;
}
/* If this is the dummy driver there is no texture support */
if (_this->is_dummy) {
return SDL_FALSE;
}
/* See if the user or application wants a specific behavior */
hint = SDL_GetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION);
if (hint) {
if (*hint == '0' || SDL_strcasecmp(hint, "false") == 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 (for cocoa and X11) */
return SDL_TRUE;
#elif defined(__LINUX__)
/* Properly configured OpenGL drivers are faster than MIT-SHM */
#if SDL_VIDEO_OPENGL
{
static SDL_bool hasAcceleratedOpenGL = HasAcceleratedOpenGL();
return hasAcceleratedOpenGL;
}
#elif SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
/* Let's be optimistic about this! */
return SDL_TRUE;