This repository has been archived by the owner on Feb 11, 2021.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
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Copyright (C) 1997-2010 Sam Lantinga
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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_pixels_c.h"
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#include "SDL_rect_c.h"
#include "SDL_yuv_sw_c.h"
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#include "SDL_renderer_sw.h"
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/* SDL surface based renderer implementation */
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static SDL_Renderer *SW_CreateRenderer(SDL_Window * window, Uint32 flags);
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static void SW_WindowEvent(SDL_Renderer * renderer,
const SDL_WindowEvent *event);
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static int SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int SW_QueryTexturePixels(SDL_Renderer * renderer,
SDL_Texture * texture, void **pixels,
int *pitch);
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static int SW_SetTextureColorMod(SDL_Renderer * renderer,
SDL_Texture * texture);
static int SW_SetTextureAlphaMod(SDL_Renderer * renderer,
SDL_Texture * texture);
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static int SW_SetTextureBlendMode(SDL_Renderer * renderer,
SDL_Texture * texture);
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static int SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels,
int pitch);
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static int 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 SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
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static int SW_RenderDrawPoints(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int SW_RenderDrawLines(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int SW_RenderFillRects(SDL_Renderer * renderer,
const SDL_Rect ** rects, int count);
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static int SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect);
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static int SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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Uint32 format, void * pixels, int pitch);
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static int SW_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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Uint32 format, const void * pixels, int pitch);
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static void SW_RenderPresent(SDL_Renderer * renderer);
static void SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static void SW_DestroyRenderer(SDL_Renderer * renderer);
SDL_RenderDriver SW_RenderDriver = {
SW_CreateRenderer,
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{
"software",
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(SDL_RENDERER_PRESENTVSYNC),
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SDL_PIXELFORMAT_RGB555,
SDL_PIXELFORMAT_RGB565,
SDL_PIXELFORMAT_RGB888,
SDL_PIXELFORMAT_BGR888,
SDL_PIXELFORMAT_ARGB8888,
SDL_PIXELFORMAT_RGBA8888,
SDL_PIXELFORMAT_ABGR8888,
SDL_PIXELFORMAT_BGRA8888,
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SDL_PIXELFORMAT_YV12,
SDL_PIXELFORMAT_IYUV,
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SDL_PIXELFORMAT_YUY2,
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SDL_PIXELFORMAT_UYVY,
SDL_PIXELFORMAT_YVYU},
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0,
0}
};
typedef struct
{
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Uint32 format;
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SDL_bool updateSize;
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SDL_Texture *texture;
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SDL_Surface surface;
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SDL_Renderer *renderer;
SDL_DirtyRectList dirty;
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} SW_RenderData;
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static SDL_Texture *
CreateTexture(SDL_Renderer * renderer, Uint32 format, int w, int h)
{
SDL_Texture *texture;
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texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
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if (!texture) {
SDL_OutOfMemory();
return NULL;
}
texture->format = format;
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texture->access = SDL_TEXTUREACCESS_STREAMING;
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texture->w = w;
texture->h = h;
texture->renderer = renderer;
if (renderer->CreateTexture(renderer, texture) < 0) {
SDL_free(texture);
return NULL;
}
return texture;
}
static void
DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
renderer->DestroyTexture(renderer, texture);
SDL_free(texture);
}
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void
Setup_SoftwareRenderer(SDL_Renderer * renderer)
{
renderer->CreateTexture = SW_CreateTexture;
renderer->QueryTexturePixels = SW_QueryTexturePixels;
renderer->SetTextureColorMod = SW_SetTextureColorMod;
renderer->SetTextureAlphaMod = SW_SetTextureAlphaMod;
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renderer->SetTextureBlendMode = SW_SetTextureBlendMode;
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renderer->UpdateTexture = SW_UpdateTexture;
renderer->LockTexture = SW_LockTexture;
renderer->UnlockTexture = SW_UnlockTexture;
renderer->DestroyTexture = SW_DestroyTexture;
renderer->info.num_texture_formats =
SW_RenderDriver.info.num_texture_formats;
SDL_memcpy(renderer->info.texture_formats,
SW_RenderDriver.info.texture_formats,
sizeof(renderer->info.texture_formats));;
renderer->info.max_texture_width = SW_RenderDriver.info.max_texture_width;
renderer->info.max_texture_height =
SW_RenderDriver.info.max_texture_height;
}
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SDL_Renderer *
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SW_CreateRenderer(SDL_Window * window, Uint32 flags)
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SDL_VideoDisplay *display = window->display;
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SDL_DisplayMode *displayMode = &display->current_mode;
SDL_Renderer *renderer;
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SW_RenderData *data;
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int i, n;
int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
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Uint32 renderer_flags;
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const char *desired_driver;
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if (!SDL_PixelFormatEnumToMasks
(displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
SDL_SetError("Unknown display format");
return NULL;
}
renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
if (!renderer) {
SDL_OutOfMemory();
return NULL;
}
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data = (SW_RenderData *) SDL_calloc(1, sizeof(*data));
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if (!data) {
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SW_DestroyRenderer(renderer);
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SDL_OutOfMemory();
return NULL;
}
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renderer->WindowEvent = SW_WindowEvent;
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renderer->RenderDrawPoints = SW_RenderDrawPoints;
renderer->RenderDrawLines = SW_RenderDrawLines;
renderer->RenderFillRects = SW_RenderFillRects;
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renderer->RenderCopy = SW_RenderCopy;
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renderer->RenderReadPixels = SW_RenderReadPixels;
renderer->RenderWritePixels = SW_RenderWritePixels;
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renderer->RenderPresent = SW_RenderPresent;
renderer->DestroyRenderer = SW_DestroyRenderer;
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renderer->info.name = SW_RenderDriver.info.name;
renderer->info.flags = 0;
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renderer->window = window;
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renderer->driverdata = data;
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Setup_SoftwareRenderer(renderer);
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data->format = displayMode->format;
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/* Find a render driver that we can use to display data */
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renderer_flags = 0;
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if (flags & SDL_RENDERER_PRESENTVSYNC) {
renderer_flags |= SDL_RENDERER_PRESENTVSYNC;
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desired_driver = SDL_getenv("SDL_VIDEO_RENDERER_SWDRIVER");
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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 == SW_RenderDriver.info.name) {
continue;
}
if (desired_driver
&& SDL_strcasecmp(desired_driver, driver->info.name) != 0) {
continue;
}
data->renderer = driver->CreateRenderer(window, renderer_flags);
if (data->renderer) {
break;
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}
}
if (i == display->num_render_drivers) {
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SW_DestroyRenderer(renderer);
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SDL_SetError("Couldn't find display render driver");
return NULL;
}
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if (data->renderer->info.flags & SDL_RENDERER_PRESENTVSYNC) {
renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;
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}
/* Create the textures we'll use for display */
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data->texture =
CreateTexture(data->renderer, data->format, window->w, window->h);
if (!data->texture) {
SW_DestroyRenderer(renderer);
return NULL;
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}
/* Create a surface we'll use for rendering */
data->surface.flags = SDL_PREALLOC;
data->surface.format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
if (!data->surface.format) {
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SW_DestroyRenderer(renderer);
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return NULL;
}
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return renderer;
}
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static SDL_Texture *
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SW_ActivateRenderer(SDL_Renderer * renderer)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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SDL_Window *window = renderer->window;
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if (data->updateSize) {
/* Recreate the textures for the new window size */
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if (data->texture) {
DestroyTexture(data->renderer, data->texture);
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data->texture = CreateTexture(data->renderer, data->format,
window->w, window->h);
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if (data->texture) {
data->updateSize = SDL_FALSE;
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return data->texture;
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static void
SW_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
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{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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if (event->event == SDL_WINDOWEVENT_RESIZED) {
data->updateSize = SDL_TRUE;
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SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
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{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
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texture->driverdata =
SDL_SW_CreateYUVTexture(texture->format, texture->w, texture->h);
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} 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;
}
texture->driverdata =
SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
Bmask, Amask);
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SDL_SetSurfaceColorMod(texture->driverdata, texture->r, texture->g,
texture->b);
SDL_SetSurfaceAlphaMod(texture->driverdata, texture->a);
SDL_SetSurfaceBlendMode(texture->driverdata, texture->blendMode);
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if (texture->access == SDL_TEXTUREACCESS_STATIC) {
SDL_SetSurfaceRLE(texture->driverdata, 1);
}
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}
if (!texture->driverdata) {
return -1;
}
return 0;
}
static int
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SW_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,
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;
}
}
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static int
SW_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
return SDL_SetSurfaceColorMod(surface, texture->r, texture->g,
texture->b);
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}
static int
SW_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
return SDL_SetSurfaceAlphaMod(surface, texture->a);
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}
static int
SW_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)
{
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
return SDL_SetSurfaceBlendMode(surface, texture->blendMode);
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SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
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{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
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return SDL_SW_UpdateYUVTexture((SDL_SW_YUVTexture *)
texture->driverdata, rect, pixels,
pitch);
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} 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
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SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, int markDirty, void **pixels,
int *pitch)
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{
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
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return SDL_SW_LockYUVTexture((SDL_SW_YUVTexture *)
texture->driverdata, rect, markDirty,
pixels, pitch);
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} 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
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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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static int
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SW_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
int count)
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{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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SDL_Texture *texture = SW_ActivateRenderer(renderer);
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SDL_Rect rect;
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int i;
int x, y;
int status = 0;
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if (!texture) {
return -1;
}
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/* Get the smallest rectangle that contains everything */
rect.x = 0;
rect.y = 0;
rect.w = texture->w;
rect.h = texture->h;
if (!SDL_EnclosePoints(points, count, &rect, &rect)) {
/* Nothing to draw */
return 0;
}
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if (data->renderer->LockTexture(data->renderer, texture, &rect, 1,
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&data->surface.pixels,
&data->surface.pitch) < 0) {
return -1;
}
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data->surface.clip_rect.w = data->surface.w = rect.w;
data->surface.clip_rect.h = data->surface.h = rect.h;
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/* Draw the points! */
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if (renderer->blendMode == SDL_BLENDMODE_NONE) {
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Uint32 color = SDL_MapRGBA(data->surface.format,
renderer->r, renderer->g, renderer->b,
renderer->a);
for (i = 0; i < count; ++i) {
x = points[i].x - rect.x;
y = points[i].y - rect.y;
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status = SDL_DrawPoint(&data->surface, x, y, color);
}
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} else {
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for (i = 0; i < count; ++i) {
x = points[i].x - rect.x;
y = points[i].y - rect.y;
status = SDL_BlendPoint(&data->surface, x, y,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
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}
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data->renderer->UnlockTexture(data->renderer, texture);
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return status;
}
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SW_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
int count)
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{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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SDL_Texture *texture = SW_ActivateRenderer(renderer);
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SDL_Rect clip, rect;
int i;
int x1, y1, x2, y2;
int status = 0;
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if (!texture) {
return -1;
}
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/* Get the smallest rectangle that contains everything */
clip.x = 0;
clip.y = 0;
clip.w = texture->w;
clip.h = texture->h;
SDL_EnclosePoints(points, count, NULL, &rect);
if (!SDL_IntersectRect(&rect, &clip, &rect)) {
/* Nothing to draw */
return 0;
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if (data->renderer->LockTexture(data->renderer, texture, &rect, 1,
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&data->surface.pixels,
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&data->surface.pitch) < 0) {
return -1;
}
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data->surface.clip_rect.w = data->surface.w = rect.w;
data->surface.clip_rect.h = data->surface.h = rect.h;
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/* Draw the points! */
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if (renderer->blendMode == SDL_BLENDMODE_NONE) {
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Uint32 color = SDL_MapRGBA(data->surface.format,
renderer->r, renderer->g, renderer->b,
renderer->a);
for (i = 1; i < count; ++i) {
x1 = points[i-1].x - rect.x;
y1 = points[i-1].y - rect.y;
x2 = points[i].x - rect.x;
y2 = points[i].y - rect.y;
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status = SDL_DrawLine(&data->surface, x1, y1, x2, y2, color);
}
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for (i = 1; i < count; ++i) {
x1 = points[i-1].x - rect.x;
y1 = points[i-1].y - rect.y;
x2 = points[i].x - rect.x;
y2 = points[i].y - rect.y;
status = SDL_BlendLine(&data->surface, x1, y1, x2, y2,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
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data->renderer->UnlockTexture(data->renderer, texture);
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return status;
}
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static int
SW_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
int count)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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SDL_Texture *texture = SW_ActivateRenderer(renderer);
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SDL_Rect clip, rect;
Uint32 color = 0;
int i;
int status = 0;
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if (!texture) {
return -1;
}
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clip.x = 0;
clip.y = 0;
clip.w = texture->w;
clip.h = texture->h;
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if (renderer->blendMode == SDL_BLENDMODE_NONE) {
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color = SDL_MapRGBA(data->surface.format,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
for (i = 0; i < count; ++i) {
if (!SDL_IntersectRect(rects[i], &clip, &rect)) {
/* Nothing to draw */
continue;
}
if (data->renderer->LockTexture(data->renderer, texture, &rect, 1,
&data->surface.pixels,
&data->surface.pitch) < 0) {
return -1;
}
data->surface.clip_rect.w = data->surface.w = rect.w;
data->surface.clip_rect.h = data->surface.h = rect.h;
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if (renderer->blendMode == SDL_BLENDMODE_NONE) {
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status = SDL_FillRect(&data->surface, NULL, color);
} else {
status = SDL_BlendFillRect(&data->surface, NULL,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
data->renderer->UnlockTexture(data->renderer, texture);
}
return status;
}
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SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect)
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SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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if (!SW_ActivateRenderer(renderer)) {
return -1;
}
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if (data->renderer->LockTexture(data->renderer, data->texture,
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dstrect, 1, &data->surface.pixels,
&data->surface.pitch) < 0) {
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return -1;
}
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if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
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status =
SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,
srcrect, data->format, dstrect->w, dstrect->h,
data->surface.pixels, data->surface.pitch);
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} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
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SDL_Rect real_srcrect = *srcrect;
SDL_Rect real_dstrect;
data->surface.w = dstrect->w;
data->surface.h = dstrect->h;
data->surface.clip_rect.w = dstrect->w;
data->surface.clip_rect.h = dstrect->h;
real_dstrect = data->surface.clip_rect;
status =
SDL_LowerBlit(surface, &real_srcrect, &data->surface,
&real_dstrect);
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data->renderer->UnlockTexture(data->renderer, data->texture);
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return status;
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static int
SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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Uint32 format, void * pixels, int pitch)
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{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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if (!SW_ActivateRenderer(renderer)) {
return -1;
}
654
if (data->renderer->LockTexture(data->renderer, data->texture,
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rect, 0, &data->surface.pixels,
&data->surface.pitch) < 0) {
return -1;
}
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SDL_ConvertPixels(rect->w, rect->h,
data->format, data->surface.pixels, data->surface.pitch,
format, pixels, pitch);
664
data->renderer->UnlockTexture(data->renderer, data->texture);
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return 0;
}
static int
SW_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
670
Uint32 format, const void * pixels, int pitch)
671
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673
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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if (!SW_ActivateRenderer(renderer)) {
return -1;
}
678
if (data->renderer->LockTexture(data->renderer, data->texture,
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681
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rect, 1, &data->surface.pixels,
&data->surface.pitch) < 0) {
return -1;
}
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SDL_ConvertPixels(rect->w, rect->h, format, pixels, pitch,
data->format, data->surface.pixels, data->surface.pitch);
687
data->renderer->UnlockTexture(data->renderer, data->texture);
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return 0;
}
692
SW_RenderPresent(SDL_Renderer * renderer)
694
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
695
SDL_Texture *texture = SW_ActivateRenderer(renderer);
696
SDL_Rect rect;
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if (!texture) {
return;
}
702
/* Send the data to the display */
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rect.x = 0;
rect.y = 0;
rect.w = texture->w;
rect.h = texture->h;
data->renderer->RenderCopy(data->renderer, texture, &rect, &rect);
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data->renderer->RenderPresent(data->renderer);
}
static void
712
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;
SDL_FreeSurface(surface);
}
}
static void
724
SW_DestroyRenderer(SDL_Renderer * renderer)
726
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
727
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SDL_Window *window = renderer->window;
SDL_VideoDisplay *display = window->display;
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731
int i;
if (data) {
732
733
if (data->texture) {
DestroyTexture(data->renderer, data->texture);
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739
740
if (data->surface.format) {
SDL_FreeFormat(data->surface.format);
}
if (data->renderer) {
data->renderer->DestroyRenderer(data->renderer);
}
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747
SDL_FreeDirtyRects(&data->dirty);
SDL_free(data);
}
SDL_free(renderer);
}
/* vi: set ts=4 sw=4 expandtab: */