This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_nullrender.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_video.h"
#include "../SDL_sysvideo.h"
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#include "../SDL_yuv_sw_c.h"
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#include "../SDL_rendercopy.h"
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/* SDL surface based renderer implementation */
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static SDL_Renderer *SDL_DUMMY_CreateRenderer(SDL_Window * window,
Uint32 flags);
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static int SDL_DUMMY_CreateTexture(SDL_Renderer * renderer,
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SDL_Texture * texture);
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static int SDL_DUMMY_QueryTexturePixels(SDL_Renderer * renderer,
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SDL_Texture * texture, void **pixels,
int *pitch);
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static int SDL_DUMMY_SetTexturePalette(SDL_Renderer * renderer,
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SDL_Texture * texture,
const SDL_Color * colors,
int firstcolor, int ncolors);
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static int SDL_DUMMY_GetTexturePalette(SDL_Renderer * renderer,
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SDL_Texture * texture,
SDL_Color * colors, int firstcolor,
int ncolors);
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static int SDL_DUMMY_SetTextureColorMod(SDL_Renderer * renderer,
SDL_Texture * texture);
static int SDL_DUMMY_SetTextureAlphaMod(SDL_Renderer * renderer,
SDL_Texture * texture);
static int SDL_DUMMY_SetTextureBlendMode(SDL_Renderer * renderer,
SDL_Texture * texture);
static int SDL_DUMMY_SetTextureScaleMode(SDL_Renderer * renderer,
SDL_Texture * texture);
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static int SDL_DUMMY_UpdateTexture(SDL_Renderer * renderer,
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SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels,
int pitch);
static int SDL_DUMMY_LockTexture(SDL_Renderer * renderer,
SDL_Texture * texture, const SDL_Rect * rect,
int markDirty, void **pixels, int *pitch);
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static void SDL_DUMMY_UnlockTexture(SDL_Renderer * renderer,
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SDL_Texture * texture);
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static void SDL_DUMMY_DirtyTexture(SDL_Renderer * renderer,
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SDL_Texture * texture, int numrects,
const SDL_Rect * rects);
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static void SDL_DUMMY_SelectRenderTexture(SDL_Renderer * renderer,
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SDL_Texture * texture);
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static int SDL_DUMMY_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g,
Uint8 b, Uint8 a, const SDL_Rect * rect);
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static int SDL_DUMMY_RenderCopy(SDL_Renderer * renderer,
SDL_Texture * texture,
const SDL_Rect * srcrect,
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const SDL_Rect * dstrect);
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static int SDL_DUMMY_RenderReadPixels(SDL_Renderer * renderer,
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const SDL_Rect * rect, void *pixels,
int pitch);
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static int SDL_DUMMY_RenderWritePixels(SDL_Renderer * renderer,
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const SDL_Rect * rect,
const void *pixels, int pitch);
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static void SDL_DUMMY_RenderPresent(SDL_Renderer * renderer);
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static void SDL_DUMMY_DestroyTexture(SDL_Renderer * renderer,
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SDL_Texture * texture);
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static void SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer);
SDL_RenderDriver SDL_DUMMY_RenderDriver = {
SDL_DUMMY_CreateRenderer,
{
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"dummy",
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(SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTCOPY |
SDL_RENDERER_PRESENTFLIP2 | SDL_RENDERER_PRESENTFLIP3 |
SDL_RENDERER_PRESENTDISCARD),
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(SDL_TEXTUREMODULATE_NONE | SDL_TEXTUREMODULATE_COLOR |
SDL_TEXTUREMODULATE_ALPHA),
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(SDL_TEXTUREBLENDMODE_NONE | SDL_TEXTUREBLENDMODE_MASK |
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SDL_TEXTUREBLENDMODE_BLEND | SDL_TEXTUREBLENDMODE_ADD |
SDL_TEXTUREBLENDMODE_MOD),
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(SDL_TEXTURESCALEMODE_NONE | SDL_TEXTURESCALEMODE_FAST),
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{
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SDL_PIXELFORMAT_INDEX8,
SDL_PIXELFORMAT_RGB555,
SDL_PIXELFORMAT_RGB565,
SDL_PIXELFORMAT_RGB888,
SDL_PIXELFORMAT_BGR888,
SDL_PIXELFORMAT_ARGB8888,
SDL_PIXELFORMAT_RGBA8888,
SDL_PIXELFORMAT_ABGR8888,
SDL_PIXELFORMAT_BGRA8888,
SDL_PIXELFORMAT_YUY2,
SDL_PIXELFORMAT_UYVY},
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0,
0}
};
typedef struct
{
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int current_screen;
SDL_Surface *screens[3];
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} SDL_DUMMY_RenderData;
SDL_Renderer *
SDL_DUMMY_CreateRenderer(SDL_Window * window, Uint32 flags)
{
SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
SDL_DisplayMode *displayMode = &display->current_mode;
SDL_Renderer *renderer;
SDL_DUMMY_RenderData *data;
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int i, n;
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int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
if (!SDL_PixelFormatEnumToMasks
(displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
SDL_SetError("Unknown display format");
return NULL;
}
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renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
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if (!renderer) {
SDL_OutOfMemory();
return NULL;
}
data = (SDL_DUMMY_RenderData *) SDL_malloc(sizeof(*data));
if (!data) {
SDL_DUMMY_DestroyRenderer(renderer);
SDL_OutOfMemory();
return NULL;
}
SDL_zerop(data);
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renderer->CreateTexture = SDL_DUMMY_CreateTexture;
renderer->QueryTexturePixels = SDL_DUMMY_QueryTexturePixels;
renderer->SetTexturePalette = SDL_DUMMY_SetTexturePalette;
renderer->GetTexturePalette = SDL_DUMMY_GetTexturePalette;
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renderer->SetTextureColorMod = SDL_DUMMY_SetTextureColorMod;
renderer->SetTextureAlphaMod = SDL_DUMMY_SetTextureAlphaMod;
renderer->SetTextureBlendMode = SDL_DUMMY_SetTextureBlendMode;
renderer->SetTextureScaleMode = SDL_DUMMY_SetTextureScaleMode;
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renderer->UpdateTexture = SDL_DUMMY_UpdateTexture;
renderer->LockTexture = SDL_DUMMY_LockTexture;
renderer->UnlockTexture = SDL_DUMMY_UnlockTexture;
renderer->DirtyTexture = SDL_DUMMY_DirtyTexture;
renderer->RenderFill = SDL_DUMMY_RenderFill;
renderer->RenderCopy = SDL_DUMMY_RenderCopy;
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renderer->RenderPresent = SDL_DUMMY_RenderPresent;
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renderer->DestroyTexture = SDL_DUMMY_DestroyTexture;
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renderer->DestroyRenderer = SDL_DUMMY_DestroyRenderer;
renderer->info = SDL_DUMMY_RenderDriver.info;
renderer->window = window->id;
renderer->driverdata = data;
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renderer->info.flags = 0;
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if (flags & SDL_RENDERER_PRESENTFLIP2) {
renderer->info.flags |= SDL_RENDERER_PRESENTFLIP2;
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} else if (flags & SDL_RENDERER_PRESENTFLIP3) {
renderer->info.flags |= SDL_RENDERER_PRESENTFLIP3;
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n = 3;
} else {
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renderer->info.flags |= SDL_RENDERER_PRESENTCOPY;
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for (i = 0; i < n; ++i) {
data->screens[i] =
SDL_CreateRGBSurface(0, window->w, window->h, bpp, Rmask, Gmask,
Bmask, Amask);
if (!data->screens[i]) {
SDL_DUMMY_DestroyRenderer(renderer);
return NULL;
}
SDL_SetSurfacePalette(data->screens[i], display->palette);
}
data->current_screen = 0;
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return renderer;
}
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static int
SDL_DUMMY_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
texture->driverdata = SDL_SW_CreateYUVTexture(texture);
} else {
int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
if (!SDL_PixelFormatEnumToMasks
(texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
SDL_SetError("Unknown texture format");
return -1;
}
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texture->driverdata =
SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
Bmask, Amask);
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}
if (!texture->driverdata) {
return -1;
}
return 0;
}
static int
SDL_DUMMY_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,
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void **pixels, int *pitch)
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{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
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return SDL_SW_QueryYUVTexturePixels((SDL_SW_YUVTexture *) texture->
driverdata, pixels, pitch);
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} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
*pixels = surface->pixels;
*pitch = surface->pitch;
return 0;
}
}
static int
SDL_DUMMY_SetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Color * colors, int firstcolor,
int ncolors)
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{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
SDL_SetError("YUV textures don't have a palette");
return -1;
} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
return SDL_SetPaletteColors(surface->format->palette, colors,
firstcolor, ncolors);
}
}
static int
SDL_DUMMY_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
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SDL_Color * colors, int firstcolor, int ncolors)
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{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
SDL_SetError("YUV textures don't have a palette");
return -1;
} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
SDL_memcpy(colors, &surface->format->palette->colors[firstcolor],
ncolors * sizeof(*colors));
return 0;
}
}
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static void
SDL_DUMMY_UpdateRenderCopyFunc(SDL_Renderer * renderer, SDL_Texture * texture)
{
SDL_Window *window = SDL_GetWindowFromID(renderer->window);
SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
surface->userdata =
SDL_GetRenderCopyFunc(texture->format, display->current_mode.format,
texture->modMode, texture->blendMode,
texture->scaleMode);
}
static int
SDL_DUMMY_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
SDL_DUMMY_UpdateRenderCopyFunc(renderer, texture);
return 0;
}
static int
SDL_DUMMY_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
SDL_DUMMY_UpdateRenderCopyFunc(renderer, texture);
return 0;
}
static int
SDL_DUMMY_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)
{
switch (texture->blendMode) {
case SDL_TEXTUREBLENDMODE_NONE:
case SDL_TEXTUREBLENDMODE_MASK:
case SDL_TEXTUREBLENDMODE_BLEND:
case SDL_TEXTUREBLENDMODE_ADD:
case SDL_TEXTUREBLENDMODE_MOD:
SDL_DUMMY_UpdateRenderCopyFunc(renderer, texture);
return 0;
default:
SDL_Unsupported();
texture->blendMode = SDL_TEXTUREBLENDMODE_NONE;
SDL_DUMMY_UpdateRenderCopyFunc(renderer, texture);
return -1;
}
}
static int
SDL_DUMMY_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture)
{
switch (texture->scaleMode) {
case SDL_TEXTURESCALEMODE_NONE:
case SDL_TEXTURESCALEMODE_FAST:
SDL_DUMMY_UpdateRenderCopyFunc(renderer, texture);
return 0;
case SDL_TEXTURESCALEMODE_SLOW:
case SDL_TEXTURESCALEMODE_BEST:
SDL_Unsupported();
texture->scaleMode = SDL_TEXTURESCALEMODE_FAST;
SDL_DUMMY_UpdateRenderCopyFunc(renderer, texture);
return -1;
default:
SDL_Unsupported();
texture->scaleMode = SDL_TEXTURESCALEMODE_NONE;
SDL_DUMMY_UpdateRenderCopyFunc(renderer, texture);
return -1;
}
}
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static int
SDL_DUMMY_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * rect, const void *pixels, int pitch)
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{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
return SDL_SW_UpdateYUVTexture((SDL_SW_YUVTexture *) texture->
driverdata, rect, pixels, pitch);
} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
Uint8 *src, *dst;
int row;
size_t length;
src = (Uint8 *) pixels;
dst =
(Uint8 *) surface->pixels + rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel;
length = rect->w * surface->format->BytesPerPixel;
for (row = 0; row < rect->h; ++row) {
SDL_memcpy(dst, src, length);
src += pitch;
dst += surface->pitch;
}
return 0;
}
}
static int
SDL_DUMMY_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * rect, int markDirty, void **pixels,
int *pitch)
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{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
return SDL_SW_LockYUVTexture((SDL_SW_YUVTexture *) texture->
driverdata, rect, markDirty, pixels,
pitch);
} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
*pixels =
(void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel);
*pitch = surface->pitch;
return 0;
}
}
static void
SDL_DUMMY_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
SDL_SW_UnlockYUVTexture((SDL_SW_YUVTexture *) texture->driverdata);
}
}
static void
SDL_DUMMY_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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int numrects, const SDL_Rect * rects)
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{
}
static int
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SDL_DUMMY_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g, Uint8 b,
Uint8 a, const SDL_Rect * rect)
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SDL_DUMMY_RenderData *data =
(SDL_DUMMY_RenderData *) renderer->driverdata;
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SDL_Surface *target = data->screens[data->current_screen];
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Uint32 color;
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SDL_Rect real_rect = *rect;
color = SDL_MapRGBA(target->format, r, g, b, a);
return SDL_FillRect(target, &real_rect, color);
}
static int
SDL_DUMMY_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect)
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SDL_DUMMY_RenderData *data =
(SDL_DUMMY_RenderData *) renderer->driverdata;
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SDL_Window *window = SDL_GetWindowFromID(renderer->window);
SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
SDL_Surface *target = data->screens[data->current_screen];
void *pixels =
(Uint8 *) target->pixels + dstrect->y * target->pitch +
dstrect->x * target->format->BytesPerPixel;
return SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,
srcrect, display->current_mode.format,
dstrect->w, dstrect->h, pixels,
target->pitch);
} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
SDL_Surface *target = data->screens[data->current_screen];
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SDL_RenderCopyFunc copyfunc = (SDL_RenderCopyFunc) surface->userdata;
if (copyfunc) {
SDL_RenderCopyData copydata;
copydata.src =
(Uint8 *) surface->pixels + srcrect->y * surface->pitch +
srcrect->x * surface->format->BytesPerPixel;
copydata.src_w = srcrect->w;
copydata.src_h = srcrect->h;
copydata.src_pitch = surface->pitch;
copydata.dst =
(Uint8 *) target->pixels + dstrect->y * target->pitch +
dstrect->x * target->format->BytesPerPixel;
copydata.dst_w = dstrect->w;
copydata.dst_h = dstrect->h;
copydata.dst_pitch = target->pitch;
copydata.flags = 0;
if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) {
copydata.flags |= SDL_RENDERCOPY_MODULATE_COLOR;
copydata.r = texture->r;
copydata.g = texture->g;
copydata.b = texture->b;
}
if (texture->modMode & SDL_TEXTUREMODULATE_ALPHA) {
copydata.flags |= SDL_RENDERCOPY_MODULATE_ALPHA;
copydata.a = texture->a;
}
if (texture->
blendMode & (SDL_TEXTUREBLENDMODE_MASK |
SDL_TEXTUREBLENDMODE_BLEND)) {
copydata.flags |= SDL_RENDERCOPY_BLEND;
} else if (texture->blendMode & SDL_TEXTUREBLENDMODE_ADD) {
copydata.flags |= SDL_RENDERCOPY_ADD;
} else if (texture->blendMode & SDL_TEXTUREBLENDMODE_MOD) {
copydata.flags |= SDL_RENDERCOPY_MOD;
}
if (texture->scaleMode) {
copydata.flags |= SDL_RENDERCOPY_NEAREST;
}
return copyfunc(©data);
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} else {
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SDL_Rect real_srcrect = *srcrect;
SDL_Rect real_dstrect = *dstrect;
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return SDL_LowerBlit(surface, &real_srcrect, target,
&real_dstrect);
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}
}
}
static void
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SDL_DUMMY_RenderPresent(SDL_Renderer * renderer)
{
static int frame_number;
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SDL_DUMMY_RenderData *data =
(SDL_DUMMY_RenderData *) renderer->driverdata;
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/* Send the data to the display */
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if (SDL_getenv("SDL_VIDEO_DUMMY_SAVE_FRAMES")) {
char file[128];
SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
renderer->window, ++frame_number);
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SDL_SaveBMP(data->screens[data->current_screen], file);
}
/* Update the flipping chain, if any */
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if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP2) {
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data->current_screen = (data->current_screen + 1) % 2;
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} else if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP3) {
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data->current_screen = (data->current_screen + 1) % 3;
}
}
static void
SDL_DUMMY_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
SDL_SW_DestroyYUVTexture((SDL_SW_YUVTexture *) texture->driverdata);
} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
SDL_FreeSurface(surface);
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static void
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SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer)
{
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SDL_DUMMY_RenderData *data =
(SDL_DUMMY_RenderData *) renderer->driverdata;
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if (data) {
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for (i = 0; i < SDL_arraysize(data->screens); ++i) {
if (data->screens[i]) {
SDL_FreeSurface(data->screens[i]);
}
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}
SDL_free(data);
}
SDL_free(renderer);
}
/* vi: set ts=4 sw=4 expandtab: */