This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_renderer_sw.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_rect_c.h"
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#include "SDL_yuv_sw_c.h"
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/* SDL surface based renderer implementation */
static SDL_Renderer *SDL_SW_CreateRenderer(SDL_Window * window, Uint32 flags);
static int SDL_SW_CreateTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
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static int SDL_SW_QueryTexturePixels(SDL_Renderer * renderer,
SDL_Texture * texture, void **pixels,
int *pitch);
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static int SDL_SW_SetTexturePalette(SDL_Renderer * renderer,
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SDL_Texture * texture,
const SDL_Color * colors, int firstcolor,
int ncolors);
static int SDL_SW_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_SW_UpdateTexture(SDL_Renderer * renderer,
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SDL_Texture * texture, const SDL_Rect * rect,
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const void *pixels, int pitch);
static int SDL_SW_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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static void SDL_SW_UnlockTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
static void SDL_SW_DirtyTexture(SDL_Renderer * renderer,
SDL_Texture * texture, int numrects,
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const SDL_Rect * rects);
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static void SDL_SW_SelectRenderTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
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static int SDL_SW_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 color);
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static int SDL_SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect,
const SDL_Rect * dstrect, int blendMode,
int scaleMode);
static int SDL_SW_RenderReadPixels(SDL_Renderer * renderer,
const SDL_Rect * rect, void *pixels,
int pitch);
static int SDL_SW_RenderWritePixels(SDL_Renderer * renderer,
const SDL_Rect * rect, const void *pixels,
int pitch);
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static void SDL_SW_RenderPresent(SDL_Renderer * renderer);
static void SDL_SW_DestroyTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
static void SDL_SW_DestroyRenderer(SDL_Renderer * renderer);
SDL_RenderDriver SDL_SW_RenderDriver = {
SDL_SW_CreateRenderer,
{
"software",
(SDL_Renderer_PresentDiscard |
SDL_Renderer_PresentCopy |
SDL_Renderer_PresentFlip2 |
SDL_Renderer_PresentFlip3 | SDL_Renderer_RenderTarget),
(SDL_TextureBlendMode_None |
SDL_TextureBlendMode_Mask | SDL_TextureBlendMode_Blend),
(SDL_TextureScaleMode_None | SDL_TextureScaleMode_Fast),
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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}
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};
typedef struct
{
int current_screen;
SDL_Surface *screens[3];
SDL_Surface *target;
SDL_Renderer *renderer;
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SDL_DirtyRectList dirty;
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} SDL_SW_RenderData;
SDL_Renderer *
SDL_SW_CreateRenderer(SDL_Window * window, Uint32 flags)
{
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SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
SDL_DisplayMode *displayMode = &display->current_mode;
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SDL_Renderer *renderer;
SDL_SW_RenderData *data;
int i, n;
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_SW_RenderData *) SDL_malloc(sizeof(*data));
if (!data) {
SDL_SW_DestroyRenderer(renderer);
SDL_OutOfMemory();
return NULL;
}
SDL_zerop(data);
renderer->CreateTexture = SDL_SW_CreateTexture;
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renderer->QueryTexturePixels = SDL_SW_QueryTexturePixels;
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renderer->SetTexturePalette = SDL_SW_SetTexturePalette;
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renderer->GetTexturePalette = SDL_SW_GetTexturePalette;
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renderer->UpdateTexture = SDL_SW_UpdateTexture;
renderer->LockTexture = SDL_SW_LockTexture;
renderer->UnlockTexture = SDL_SW_UnlockTexture;
renderer->DirtyTexture = SDL_SW_DirtyTexture;
renderer->SelectRenderTexture = SDL_SW_SelectRenderTexture;
renderer->RenderFill = SDL_SW_RenderFill;
renderer->RenderCopy = SDL_SW_RenderCopy;
renderer->RenderReadPixels = SDL_SW_RenderReadPixels;
renderer->RenderWritePixels = SDL_SW_RenderWritePixels;
renderer->RenderPresent = SDL_SW_RenderPresent;
renderer->DestroyTexture = SDL_SW_DestroyTexture;
renderer->DestroyRenderer = SDL_SW_DestroyRenderer;
renderer->info = SDL_SW_RenderDriver.info;
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renderer->window = window->id;
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renderer->driverdata = data;
renderer->info.flags = SDL_Renderer_RenderTarget;
if (flags & SDL_Renderer_PresentFlip2) {
renderer->info.flags |= SDL_Renderer_PresentFlip2;
n = 2;
} else if (flags & SDL_Renderer_PresentFlip3) {
renderer->info.flags |= SDL_Renderer_PresentFlip3;
n = 3;
} else {
renderer->info.flags |= SDL_Renderer_PresentCopy;
n = 1;
}
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_SW_DestroyRenderer(renderer);
return NULL;
}
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SDL_SetSurfacePalette(data->screens[i], display->palette);
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}
data->current_screen = 0;
data->target = data->screens[0];
/* Find a render driver that we can use to display data */
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for (i = 0; i < display->num_render_drivers; ++i) {
SDL_RenderDriver *driver = &display->render_drivers[i];
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if (driver->info.name != SDL_SW_RenderDriver.info.name) {
data->renderer =
driver->CreateRenderer(window, SDL_Renderer_PresentDiscard);
if (data->renderer) {
break;
}
}
}
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if (i == display->num_render_drivers) {
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SDL_SW_DestroyRenderer(renderer);
SDL_SetError("Couldn't find display render driver");
return NULL;
}
return renderer;
}
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SDL_SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
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if (texture->access == SDL_TextureAccess_Render) {
SDL_SetError("Rendering to YUV format textures is not supported");
return -1;
}
texture->driverdata = SDL_SW_CreateYUVTexture(texture);
} else {
int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
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if (!SDL_PixelFormatEnumToMasks
(texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
SDL_SetError("Unknown texture format");
return -1;
}
texture->driverdata =
SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
Bmask, Amask);
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if (!texture->driverdata) {
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return -1;
}
return 0;
}
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SDL_SW_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,
void **pixels, int *pitch)
{
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if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
return SDL_SW_QueryYUVTexturePixels((SDL_SW_YUVTexture *) texture->
driverdata, pixels, pitch);
} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
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*pixels = surface->pixels;
*pitch = surface->pitch;
return 0;
}
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static int
SDL_SW_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;
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return SDL_SetPaletteColors(surface->format->palette, colors,
firstcolor, ncolors);
}
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static int
SDL_SW_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
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;
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SDL_memcpy(colors, &surface->format->palette->colors[firstcolor],
ncolors * sizeof(*colors));
return 0;
}
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SDL_SW_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;
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}
}
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SDL_SW_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;
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*pixels =
(void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel);
*pitch = surface->pitch;
return 0;
}
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SDL_SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
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if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
SDL_SW_UnlockYUVTexture((SDL_SW_YUVTexture *) texture->driverdata);
}
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SDL_SW_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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int numrects, const SDL_Rect * rects)
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{
}
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SDL_SW_SelectRenderTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
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if (texture) {
data->target = (SDL_Surface *) texture->driverdata;
} else {
data->target = data->screens[data->current_screen];
}
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SDL_SW_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 color)
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{
SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
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SDL_Rect real_rect = *rect;
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Uint8 r, g, b, a;
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SDL_AddDirtyRect(&data->dirty, rect);
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a = (Uint8) ((color >> 24) & 0xFF);
r = (Uint8) ((color >> 16) & 0xFF);
g = (Uint8) ((color >> 8) & 0xFF);
b = (Uint8) (color & 0xFF);
color = SDL_MapRGBA(data->target->format, r, g, b, a);
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return SDL_FillRect(data->target, &real_rect, color);
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SDL_SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect,
int blendMode, int scaleMode)
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{
SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
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SDL_Window *window = SDL_GetWindowFromID(renderer->window);
SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
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SDL_AddDirtyRect(&data->dirty, dstrect);
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if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
SDL_Surface *target = data->target;
void *pixels =
(Uint8 *) target->pixels + dstrect->y * target->pitch +
dstrect->x * target->format->BytesPerPixel;
return SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,
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srcrect, display->current_mode.format,
dstrect->w, dstrect->h, pixels,
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target->pitch);
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} else {
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
SDL_Rect real_srcrect = *srcrect;
SDL_Rect real_dstrect = *dstrect;
if (blendMode &
(SDL_TextureBlendMode_Mask | SDL_TextureBlendMode_Blend)) {
SDL_SetAlpha(surface, SDL_SRCALPHA, 0);
} else {
SDL_SetAlpha(surface, 0, 0);
}
if (scaleMode != SDL_TextureScaleMode_None &&
(srcrect->w != dstrect->w || srcrect->h != dstrect->h)) {
return SDL_SoftStretch(surface, &real_srcrect, data->target,
&real_dstrect);
} else {
return SDL_LowerBlit(surface, &real_srcrect, data->target,
&real_dstrect);
}
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}
}
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SDL_SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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void *pixels, int pitch)
{
SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
SDL_Surface *surface = data->target;
Uint8 *src, *dst;
int row;
size_t length;
src =
(Uint8 *) surface->pixels + rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel;
dst = (Uint8 *) pixels;
length = rect->w * surface->format->BytesPerPixel;
for (row = 0; row < rect->h; ++row) {
SDL_memcpy(dst, src, length);
src += surface->pitch;
dst += pitch;
}
return 0;
}
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SDL_SW_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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const void *pixels, int pitch)
{
SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
SDL_Surface *surface = data->target;
Uint8 *src, *dst;
int row;
size_t length;
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SDL_AddDirtyRect(&data->dirty, rect);
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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;
}
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SDL_SW_RenderPresent(SDL_Renderer * renderer)
{
SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
SDL_Surface *surface = data->screens[data->current_screen];
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SDL_DirtyRect *dirty;
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int new_screen;
/* Send the data to the display */
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for (dirty = data->dirty.list; dirty; dirty = dirty->next) {
void *pixels =
(void *) ((Uint8 *) surface->pixels +
dirty->rect.y * surface->pitch +
dirty->rect.x * surface->format->BytesPerPixel);
data->renderer->RenderWritePixels(data->renderer, &dirty->rect,
pixels, surface->pitch);
}
SDL_ClearDirtyRects(&data->dirty);
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data->renderer->RenderPresent(data->renderer);
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/* Update the flipping chain, if any */
if (renderer->info.flags & SDL_Renderer_PresentFlip2) {
new_screen = (data->current_screen + 1) % 2;
} else if (renderer->info.flags & SDL_Renderer_PresentFlip3) {
new_screen = (data->current_screen + 1) % 3;
} else {
new_screen = 0;
}
if (data->target == data->screens[data->current_screen]) {
data->target = data->screens[new_screen];
}
data->current_screen = new_screen;
}
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SDL_SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
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if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
SDL_SW_DestroyYUVTexture((SDL_SW_YUVTexture *) texture->driverdata);
} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
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SDL_FreeSurface(surface);
}
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SDL_SW_DestroyRenderer(SDL_Renderer * renderer)
{
SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
int i;
if (data) {
for (i = 0; i < SDL_arraysize(data->screens); ++i) {
if (data->screens[i]) {
SDL_FreeSurface(data->screens[i]);
}
}
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SDL_FreeDirtyRects(&data->dirty);
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SDL_free(data);
}
SDL_free(renderer);
}
/* vi: set ts=4 sw=4 expandtab: */