Atlas - SDL_riscosframebuffer.c
Home / ext / SDL / src / video / riscos
Lines: 1 | Size: 4101 bytes
[Download] [Show on GitHub] [Search similar files] [Raw] [Raw (proxy)] 
[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include "SDL_internal.h"
22
23#ifdef SDL_VIDEO_DRIVER_RISCOS
24
25#include "../SDL_sysvideo.h"
26#include "SDL_riscosframebuffer_c.h"
27#include "SDL_riscosvideo.h"
28#include "SDL_riscoswindow.h"
29
30#include <kernel.h>
31#include <swis.h>
32
33bool RISCOS_CreateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, SDL_PixelFormat *format, void **pixels, int *pitch)
34{
35    SDL_WindowData *internal = window->internal;
36    const char *sprite_name = "display";
37    unsigned int sprite_mode;
38    _kernel_oserror *error;
39    _kernel_swi_regs regs;
40    const SDL_DisplayMode *mode;
41    int size;
42    int w, h;
43
44    SDL_GetWindowSizeInPixels(window, &w, &h);
45
46    // Free the old framebuffer surface
47    RISCOS_DestroyWindowFramebuffer(_this, window);
48
49    // Create a new one
50    mode = SDL_GetCurrentDisplayMode(SDL_GetDisplayForWindow(window));
51    if ((SDL_ISPIXELFORMAT_PACKED(mode->format) || SDL_ISPIXELFORMAT_ARRAY(mode->format))) {
52        *format = mode->format;
53        sprite_mode = (unsigned int)mode->internal;
54    } else {
55        *format = SDL_PIXELFORMAT_XBGR8888;
56        sprite_mode = (1 | (90 << 1) | (90 << 14) | (6 << 27));
57    }
58
59    // Calculate pitch
60    *pitch = (((w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
61
62    // Allocate the sprite area
63    size = sizeof(sprite_area) + sizeof(sprite_header) + ((*pitch) * h);
64    internal->fb_area = SDL_malloc(size);
65    if (!internal->fb_area) {
66        return false;
67    }
68
69    internal->fb_area->size = size;
70    internal->fb_area->count = 0;
71    internal->fb_area->start = 16;
72    internal->fb_area->end = 16;
73
74    // Create the actual image
75    regs.r[0] = 256 + 15;
76    regs.r[1] = (int)internal->fb_area;
77    regs.r[2] = (int)sprite_name;
78    regs.r[3] = 0;
79    regs.r[4] = w;
80    regs.r[5] = h;
81    regs.r[6] = sprite_mode;
82    error = _kernel_swi(OS_SpriteOp, &regs, &regs);
83    if (error) {
84        SDL_free(internal->fb_area);
85        return SDL_SetError("Unable to create sprite: %s (%i)", error->errmess, error->errnum);
86    }
87
88    internal->fb_sprite = (sprite_header *)(((Uint8 *)internal->fb_area) + internal->fb_area->start);
89    *pixels = ((Uint8 *)internal->fb_sprite) + internal->fb_sprite->image_offset;
90
91    return true;
92}
93
94bool RISCOS_UpdateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, const SDL_Rect *rects, int numrects)
95{
96    SDL_WindowData *internal = window->internal;
97    _kernel_swi_regs regs;
98    _kernel_oserror *error;
99
100    regs.r[0] = 512 + 52;
101    regs.r[1] = (int)internal->fb_area;
102    regs.r[2] = (int)internal->fb_sprite;
103    regs.r[3] = 0; // window->x << 1;
104    regs.r[4] = 0; // window->y << 1;
105    regs.r[5] = 0x50;
106    regs.r[6] = 0;
107    regs.r[7] = 0;
108    error = _kernel_swi(OS_SpriteOp, &regs, &regs);
109    if (error) {
110        return SDL_SetError("OS_SpriteOp 52 failed: %s (%i)", error->errmess, error->errnum);
111    }
112
113    return true;
114}
115
116void RISCOS_DestroyWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window)
117{
118    SDL_WindowData *internal = window->internal;
119
120    if (internal->fb_area) {
121        SDL_free(internal->fb_area);
122        internal->fb_area = NULL;
123    }
124    internal->fb_sprite = NULL;
125}
126
127#endif // SDL_VIDEO_DRIVER_RISCOS
128
[FILE END]
(C) 2025 0x4248
(C) 2025 4248 Media and 4248 Systems, All part of 0x4248
See LICENCE files for more information. Not all files are by 0x4248 always check Licencing.