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Added SDL_RenderSetLogicalSize() and SDL_RenderGetLogicalSize()

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This commit is contained in:
Sam Lantinga
2012-10-01 22:30:07 -07:00
parent f4bf4989ce
commit aab04f8c71
3 changed files with 166 additions and 11 deletions
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129
src/render/SDL_render.c
View File

@@ -70,6 +70,8 @@ static const SDL_RenderDriver *render_drivers[] = {
static char renderer_magic;
static char texture_magic;
static int UpdateLogicalSize(SDL_Renderer *renderer);
int
SDL_GetNumRenderDrivers(void)
{
@@ -101,21 +103,27 @@ SDL_RendererEventWatch(void *userdata, SDL_Event *event)
}
if (event->window.event == SDL_WINDOWEVENT_RESIZED) {
/* Try to keep the previous viewport centered */
int w, h;
SDL_GetWindowSize(window, &w, &h);
if (renderer->target) {
renderer->viewport_backup.x = (w - renderer->viewport_backup.w) / 2;
renderer->viewport_backup.y = (h - renderer->viewport_backup.h) / 2;
if (renderer->logical_w) {
/* We'll update the renderer in the SIZE_CHANGED event */
} else {
renderer->viewport.x = (w - renderer->viewport.w) / 2;
renderer->viewport.y = (h - renderer->viewport.h) / 2;
renderer->UpdateViewport(renderer);
/* Try to keep the previous viewport centered */
int w, h;
SDL_GetWindowSize(window, &w, &h);
if (renderer->target) {
renderer->viewport_backup.x = (w - renderer->viewport_backup.w) / 2;
renderer->viewport_backup.y = (h - renderer->viewport_backup.h) / 2;
} else {
renderer->viewport.x = (w - renderer->viewport.w) / 2;
renderer->viewport.y = (h - renderer->viewport.h) / 2;
renderer->UpdateViewport(renderer);
}
}
renderer->resized = SDL_TRUE;
} else if (event->window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
if (!renderer->resized) {
if (renderer->logical_w) {
UpdateLogicalSize(renderer);
} else if (!renderer->resized) {
/* Window was programmatically resized, reset viewport */
int w, h;
@@ -148,6 +156,21 @@ SDL_RendererEventWatch(void *userdata, SDL_Event *event)
}
}
}
} else if (event->type == SDL_MOUSEMOTION) {
if (renderer->logical_w) {
event->motion.x -= renderer->viewport.x;
event->motion.y -= renderer->viewport.y;
event->motion.x = (int)(event->motion.x / renderer->scale.x);
event->motion.y = (int)(event->motion.y / renderer->scale.y);
}
} else if (event->type == SDL_MOUSEBUTTONDOWN ||
event->type == SDL_MOUSEBUTTONUP) {
if (renderer->logical_w) {
event->button.x -= renderer->viewport.x;
event->button.y -= renderer->viewport.y;
event->button.x = (int)(event->button.x / renderer->scale.x);
event->button.y = (int)(event->button.y / renderer->scale.y);
}
}
return 0;
}
@@ -245,6 +268,8 @@ SDL_CreateRenderer(SDL_Window * window, int index, Uint32 flags)
renderer->window = window;
renderer->scale.x = 1.0f;
renderer->scale.y = 1.0f;
renderer->logical_w = 0;
renderer->logical_h = 0;
if (SDL_GetWindowFlags(window) & (SDL_WINDOW_HIDDEN|SDL_WINDOW_MINIMIZED)) {
renderer->hidden = SDL_TRUE;
@@ -921,6 +946,88 @@ SDL_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture)
return 0;
}
static int
UpdateLogicalSize(SDL_Renderer *renderer)
{
int w, h;
float want_aspect;
float real_aspect;
float scale;
SDL_Rect viewport;
if (renderer->window) {
SDL_GetWindowSize(renderer->window, &w, &h);
} else {
/* FIXME */
SDL_SetError("Internal error: No way to get output resolution");
return -1;
}
want_aspect = (float)renderer->logical_w / renderer->logical_h;
real_aspect = (float)w / h;
/* Clear the scale because we're setting viewport in output coordinates */
SDL_RenderSetScale(renderer, 1.0f, 1.0f);
if (SDL_fabs(want_aspect-real_aspect) < 0.0001) {
/* The aspect ratios are the same, just scale appropriately */
scale = (float)w / renderer->logical_w;
SDL_RenderSetViewport(renderer, NULL);
} else if (want_aspect > real_aspect) {
/* We want a wider aspect ratio than is available - letterbox it */
scale = (float)w / renderer->logical_w;
viewport.x = 0;
viewport.w = w;
viewport.h = (int)SDL_ceil(renderer->logical_h * scale);
viewport.y = (h - viewport.h) / 2;
SDL_RenderSetViewport(renderer, &viewport);
} else {
/* We want a narrower aspect ratio than is available - use side-bars */
scale = (float)h / renderer->logical_h;
viewport.y = 0;
viewport.h = h;
viewport.w = (int)SDL_ceil(renderer->logical_w * scale);
viewport.x = (w - viewport.w) / 2;
SDL_RenderSetViewport(renderer, &viewport);
}
/* Set the new scale */
SDL_RenderSetScale(renderer, scale, scale);
}
int
SDL_RenderSetLogicalSize(SDL_Renderer * renderer, int w, int h)
{
CHECK_RENDERER_MAGIC(renderer, -1);
if (!w || !h) {
/* Clear any previous logical resolution */
renderer->logical_w = 0;
renderer->logical_h = 0;
SDL_RenderSetViewport(renderer, NULL);
SDL_RenderSetScale(renderer, 1.0f, 1.0f);
return 0;
}
renderer->logical_w = w;
renderer->logical_h = h;
return UpdateLogicalSize(renderer);
}
void
SDL_RenderGetLogicalSize(SDL_Renderer * renderer, int *w, int *h)
{
CHECK_RENDERER_MAGIC(renderer, );
if (w) {
*w = renderer->logical_w;
}
if (h) {
*h = renderer->logical_h;
}
}
int
SDL_RenderSetViewport(SDL_Renderer * renderer, const SDL_Rect * rect)
{

4
src/render/SDL_sysrender.h
View File

@@ -123,6 +123,10 @@ struct SDL_Renderer
SDL_bool hidden;
SDL_bool resized;
/* The logical resolution for rendering */
int logical_w;
int logical_h;
/* The drawable area within the window */
SDL_Rect viewport;
SDL_Rect viewport_backup;