--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/video/SDL_renderer_sw.c	Mon Jun 12 09:10:06 2006 +0000
@@ -0,0 +1,409 @@
+/*
+    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"
+
+
+/* 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);
+static int SDL_SW_UpdateTexture(SDL_Renderer * renderer,
+                                SDL_Texture * texture, SDL_Rect * rect,
+                                const void *pixels, int pitch);
+static int SDL_SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
+                              SDL_Rect * rect, int markDirty, void **pixels,
+                              int *pitch);
+static void SDL_SW_UnlockTexture(SDL_Renderer * renderer,
+                                 SDL_Texture * texture);
+static void SDL_SW_DirtyTexture(SDL_Renderer * renderer,
+                                SDL_Texture * texture, int numrects,
+                                SDL_Rect * rects);
+static void SDL_SW_SelectRenderTexture(SDL_Renderer * renderer,
+                                       SDL_Texture * texture);
+static void SDL_SW_RenderFill(SDL_Renderer * renderer, SDL_Rect * rect,
+                              Uint32 color);
+static int SDL_SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
+                             SDL_Rect * srcrect, SDL_Rect * dstrect,
+                             int blendMode, int scaleMode);
+static int SDL_SW_RenderReadPixels(SDL_Renderer * renderer, SDL_Rect * rect,
+                                   void *pixels, int pitch);
+static int SDL_SW_RenderWritePixels(SDL_Renderer * renderer, SDL_Rect * rect,
+                                    const void *pixels, int pitch);
+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),
+     11,
+     {
+      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},
+     32768,
+     32768}
+};
+
+typedef struct
+{
+    int current_screen;
+    SDL_Surface *screens[3];
+    SDL_Surface *target;
+    SDL_Renderer *renderer;
+} SDL_SW_RenderData;
+
+SDL_Renderer *
+SDL_SW_CreateRenderer(SDL_Window * window, Uint32 flags)
+{
+    SDL_DisplayMode *displayMode = &window->display->current_mode;
+    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;
+    }
+
+    renderer = (SDL_Renderer *) SDL_malloc(sizeof(*renderer));
+    if (!renderer) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+    SDL_zerop(renderer);
+
+    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;
+    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;
+    renderer->window = window;
+    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;
+        }
+    }
+    data->current_screen = 0;
+    data->target = data->screens[0];
+
+    /* Find a render driver that we can use to display data */
+    for (i = 0; i < window->display->num_render_drivers; ++i) {
+        SDL_RenderDriver *driver = &window->display->render_drivers[i];
+        if (driver->info.name != SDL_SW_RenderDriver.info.name) {
+            data->renderer =
+                driver->CreateRenderer(window, SDL_Renderer_PresentDiscard);
+            if (data->renderer) {
+                break;
+            }
+        }
+    }
+    if (i == window->display->num_render_drivers) {
+        SDL_SW_DestroyRenderer(renderer);
+        SDL_SetError("Couldn't find display render driver");
+        return NULL;
+    }
+    return renderer;
+}
+
+int
+SDL_SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+    SDL_Surface *surface;
+    int bpp;
+    Uint32 Rmask, Gmask, Bmask, Amask;
+
+    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
+        /* FIXME: implement this */
+        return -1;
+    }
+
+    if (!SDL_PixelFormatEnumToMasks
+        (texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
+        SDL_SetError("Unknown texture format");
+        return -1;
+    }
+
+    surface =
+        SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
+                             Bmask, Amask);
+    if (!surface) {
+        return -1;
+    }
+
+    texture->driverdata = surface;
+    return 0;
+}
+
+int
+SDL_SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
+                     SDL_Rect * rect, const void *pixels, int pitch)
+{
+    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;
+}
+
+int
+SDL_SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
+                   SDL_Rect * rect, int markDirty, void **pixels, int *pitch)
+{
+    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;
+}
+
+void
+SDL_SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+}
+
+void
+SDL_SW_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
+                    int numrects, SDL_Rect * rects)
+{
+}
+
+void
+SDL_SW_SelectRenderTexture(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+    SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
+    data->target = (SDL_Surface *) texture->driverdata;
+}
+
+void
+SDL_SW_RenderFill(SDL_Renderer * renderer, SDL_Rect * rect, Uint32 color)
+{
+    SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
+    Uint8 r, g, b, a;
+
+    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);
+
+    SDL_FillRect(data->target, rect, color);
+}
+
+int
+SDL_SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
+                  SDL_Rect * srcrect, SDL_Rect * dstrect, int blendMode,
+                  int scaleMode)
+{
+    SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
+    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
+
+    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, srcrect, data->target, dstrect);
+    } else {
+        return SDL_LowerBlit(surface, srcrect, data->target, dstrect);
+    }
+}
+
+int
+SDL_SW_RenderReadPixels(SDL_Renderer * renderer, SDL_Rect * rect,
+                        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;
+}
+
+int
+SDL_SW_RenderWritePixels(SDL_Renderer * renderer, SDL_Rect * rect,
+                         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;
+
+    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;
+}
+
+void
+SDL_SW_RenderPresent(SDL_Renderer * renderer)
+{
+    SDL_SW_RenderData *data = (SDL_SW_RenderData *) renderer->driverdata;
+    SDL_Surface *surface = data->screens[data->current_screen];
+    SDL_Rect rect;
+    int new_screen;
+
+    /* Send the data to the display */
+    /* FIXME: implement dirty rect updates */
+    rect.x = 0;
+    rect.y = 0;
+    rect.w = surface->w;
+    rect.h = surface->h;
+    data->renderer->RenderWritePixels(data->renderer, &rect, surface->pixels,
+                                      surface->pitch);
+    data->renderer->RenderPresent(data->renderer);
+
+    /* 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;
+}
+
+void
+SDL_SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
+
+    SDL_FreeSurface(surface);
+}
+
+void
+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]);
+            }
+        }
+        SDL_free(data);
+    }
+    SDL_free(renderer);
+}
+
+/* vi: set ts=4 sw=4 expandtab: */