From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 27 Dec 2025 12:03:39 -0800
Subject: Initial commit

---
 .../src/video/riscos/SDL_riscosframebuffer.c       | 127 +++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 contrib/SDL-3.2.8/src/video/riscos/SDL_riscosframebuffer.c

(limited to 'contrib/SDL-3.2.8/src/video/riscos/SDL_riscosframebuffer.c')

diff --git a/contrib/SDL-3.2.8/src/video/riscos/SDL_riscosframebuffer.c b/contrib/SDL-3.2.8/src/video/riscos/SDL_riscosframebuffer.c
new file mode 100644
index 0000000..a13cab8
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/video/riscos/SDL_riscosframebuffer.c
@@ -0,0 +1,127 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_VIDEO_DRIVER_RISCOS
+
+#include "../SDL_sysvideo.h"
+#include "SDL_riscosframebuffer_c.h"
+#include "SDL_riscosvideo.h"
+#include "SDL_riscoswindow.h"
+
+#include <kernel.h>
+#include <swis.h>
+
+bool RISCOS_CreateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, SDL_PixelFormat *format, void **pixels, int *pitch)
+{
+    SDL_WindowData *internal = window->internal;
+    const char *sprite_name = "display";
+    unsigned int sprite_mode;
+    _kernel_oserror *error;
+    _kernel_swi_regs regs;
+    const SDL_DisplayMode *mode;
+    int size;
+    int w, h;
+
+    SDL_GetWindowSizeInPixels(window, &w, &h);
+
+    // Free the old framebuffer surface
+    RISCOS_DestroyWindowFramebuffer(_this, window);
+
+    // Create a new one
+    mode = SDL_GetCurrentDisplayMode(SDL_GetDisplayForWindow(window));
+    if ((SDL_ISPIXELFORMAT_PACKED(mode->format) || SDL_ISPIXELFORMAT_ARRAY(mode->format))) {
+        *format = mode->format;
+        sprite_mode = (unsigned int)mode->internal;
+    } else {
+        *format = SDL_PIXELFORMAT_XBGR8888;
+        sprite_mode = (1 | (90 << 1) | (90 << 14) | (6 << 27));
+    }
+
+    // Calculate pitch
+    *pitch = (((w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
+
+    // Allocate the sprite area
+    size = sizeof(sprite_area) + sizeof(sprite_header) + ((*pitch) * h);
+    internal->fb_area = SDL_malloc(size);
+    if (!internal->fb_area) {
+        return false;
+    }
+
+    internal->fb_area->size = size;
+    internal->fb_area->count = 0;
+    internal->fb_area->start = 16;
+    internal->fb_area->end = 16;
+
+    // Create the actual image
+    regs.r[0] = 256 + 15;
+    regs.r[1] = (int)internal->fb_area;
+    regs.r[2] = (int)sprite_name;
+    regs.r[3] = 0;
+    regs.r[4] = w;
+    regs.r[5] = h;
+    regs.r[6] = sprite_mode;
+    error = _kernel_swi(OS_SpriteOp, &regs, &regs);
+    if (error) {
+        SDL_free(internal->fb_area);
+        return SDL_SetError("Unable to create sprite: %s (%i)", error->errmess, error->errnum);
+    }
+
+    internal->fb_sprite = (sprite_header *)(((Uint8 *)internal->fb_area) + internal->fb_area->start);
+    *pixels = ((Uint8 *)internal->fb_sprite) + internal->fb_sprite->image_offset;
+
+    return true;
+}
+
+bool RISCOS_UpdateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, const SDL_Rect *rects, int numrects)
+{
+    SDL_WindowData *internal = window->internal;
+    _kernel_swi_regs regs;
+    _kernel_oserror *error;
+
+    regs.r[0] = 512 + 52;
+    regs.r[1] = (int)internal->fb_area;
+    regs.r[2] = (int)internal->fb_sprite;
+    regs.r[3] = 0; // window->x << 1;
+    regs.r[4] = 0; // window->y << 1;
+    regs.r[5] = 0x50;
+    regs.r[6] = 0;
+    regs.r[7] = 0;
+    error = _kernel_swi(OS_SpriteOp, &regs, &regs);
+    if (error) {
+        return SDL_SetError("OS_SpriteOp 52 failed: %s (%i)", error->errmess, error->errnum);
+    }
+
+    return true;
+}
+
+void RISCOS_DestroyWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window)
+{
+    SDL_WindowData *internal = window->internal;
+
+    if (internal->fb_area) {
+        SDL_free(internal->fb_area);
+        internal->fb_area = NULL;
+    }
+    internal->fb_sprite = NULL;
+}
+
+#endif // SDL_VIDEO_DRIVER_RISCOS
-- 
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