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render: allow render targets to use logical presentation.

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Fixes https://github.com/libsdl-org/sdl2-compat/issues/279
This commit is contained in:
Ryan C. Gordon 2025-02-27 17:28:47 -05:00
parent 281f0fae1c
commit 35e8cf8ee6
3 changed files with 296 additions and 219 deletions
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16
src/render/SDL_sysrender.h
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@ -65,8 +65,15 @@ typedef struct SDL_RenderViewState
SDL_Rect pixel_clip_rect;
bool clipping_enabled;
SDL_FPoint scale;
// Support for logical output coordinates
SDL_RendererLogicalPresentation logical_presentation_mode;
int logical_w, logical_h;
SDL_FRect logical_src_rect;
SDL_FRect logical_dst_rect;
SDL_FPoint logical_scale;
SDL_FPoint logical_offset;
SDL_FPoint current_scale; // this is just `scale * logical_scale`, precalculated, since we use it a lot.
} SDL_RenderViewState;
@ -248,18 +255,9 @@ struct SDL_Renderer
Uint64 simulate_vsync_interval_ns;
Uint64 last_present;
// Support for logical output coordinates
SDL_RendererLogicalPresentation logical_presentation_mode;
int logical_w, logical_h;
SDL_FRect logical_src_rect;
SDL_FRect logical_dst_rect;
SDL_RenderViewState *view;
SDL_RenderViewState main_view;
// Cache the output size in pixels
int output_pixel_w, output_pixel_h;
// The window pixel to point coordinate scale
SDL_FPoint dpi_scale;