| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../../SDL_internal.h" |
| |
| #if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED |
| |
| #include "../SDL_sysrender.h" |
| #include "SDL_render_sw_c.h" |
| #include "SDL_hints.h" |
| |
| #include "SDL_draw.h" |
| #include "SDL_blendfillrect.h" |
| #include "SDL_blendline.h" |
| #include "SDL_blendpoint.h" |
| #include "SDL_drawline.h" |
| #include "SDL_drawpoint.h" |
| #include "SDL_rotate.h" |
| #include "SDL_triangle.h" |
| |
| /* SDL surface based renderer implementation */ |
| |
| typedef struct |
| { |
| const SDL_Rect *viewport; |
| const SDL_Rect *cliprect; |
| SDL_bool surface_cliprect_dirty; |
| } SW_DrawStateCache; |
| |
| typedef struct |
| { |
| SDL_Surface *surface; |
| SDL_Surface *window; |
| } SW_RenderData; |
| |
| static SDL_Surface *SW_ActivateRenderer(SDL_Renderer *renderer) |
| { |
| SW_RenderData *data = (SW_RenderData *)renderer->driverdata; |
| |
| if (!data->surface) { |
| data->surface = data->window; |
| } |
| if (!data->surface) { |
| SDL_Surface *surface = SDL_GetWindowSurface(renderer->window); |
| if (surface) { |
| data->surface = data->window = surface; |
| } |
| } |
| return data->surface; |
| } |
| |
| static void SW_WindowEvent(SDL_Renderer *renderer, const SDL_WindowEvent *event) |
| { |
| SW_RenderData *data = (SW_RenderData *)renderer->driverdata; |
| |
| if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) { |
| data->surface = NULL; |
| data->window = NULL; |
| } |
| } |
| |
| static int SW_GetOutputSize(SDL_Renderer *renderer, int *w, int *h) |
| { |
| SW_RenderData *data = (SW_RenderData *)renderer->driverdata; |
| |
| if (data->surface) { |
| if (w) { |
| *w = data->surface->w; |
| } |
| if (h) { |
| *h = data->surface->h; |
| } |
| return 0; |
| } |
| |
| if (renderer->window) { |
| SDL_GetWindowSizeInPixels(renderer->window, w, h); |
| return 0; |
| } |
| |
| return SDL_SetError("Software renderer doesn't have an output surface"); |
| } |
| |
| static int SW_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture) |
| { |
| int bpp; |
| Uint32 Rmask, Gmask, Bmask, Amask; |
| |
| if (!SDL_PixelFormatEnumToMasks(texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) { |
| return SDL_SetError("Unknown texture format"); |
| } |
| |
| texture->driverdata = |
| SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask, |
| Bmask, Amask); |
| SDL_SetSurfaceColorMod(texture->driverdata, texture->color.r, texture->color.g, texture->color.b); |
| SDL_SetSurfaceAlphaMod(texture->driverdata, texture->color.a); |
| SDL_SetSurfaceBlendMode(texture->driverdata, texture->blendMode); |
| |
| /* Only RLE encode textures without an alpha channel since the RLE coder |
| * discards the color values of pixels with an alpha value of zero. |
| */ |
| if (texture->access == SDL_TEXTUREACCESS_STATIC && !Amask) { |
| SDL_SetSurfaceRLE(texture->driverdata, 1); |
| } |
| |
| if (!texture->driverdata) { |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int SW_UpdateTexture(SDL_Renderer *renderer, SDL_Texture *texture, |
| const SDL_Rect *rect, const void *pixels, int pitch) |
| { |
| SDL_Surface *surface = (SDL_Surface *)texture->driverdata; |
| Uint8 *src, *dst; |
| int row; |
| size_t length; |
| |
| if (SDL_MUSTLOCK(surface)) { |
| SDL_LockSurface(surface); |
| } |
| src = (Uint8 *)pixels; |
| dst = (Uint8 *)surface->pixels + |
| rect->y * surface->pitch + |
| rect->x * surface->format->BytesPerPixel; |
| length = (size_t)rect->w * surface->format->BytesPerPixel; |
| for (row = 0; row < rect->h; ++row) { |
| SDL_memcpy(dst, src, length); |
| src += pitch; |
| dst += surface->pitch; |
| } |
| if (SDL_MUSTLOCK(surface)) { |
| SDL_UnlockSurface(surface); |
| } |
| return 0; |
| } |
| |
| static int SW_LockTexture(SDL_Renderer *renderer, SDL_Texture *texture, |
| const SDL_Rect *rect, 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; |
| } |
| |
| static void SW_UnlockTexture(SDL_Renderer *renderer, SDL_Texture *texture) |
| { |
| } |
| |
| static void SW_SetTextureScaleMode(SDL_Renderer *renderer, SDL_Texture *texture, SDL_ScaleMode scaleMode) |
| { |
| } |
| |
| static int SW_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture) |
| { |
| SW_RenderData *data = (SW_RenderData *)renderer->driverdata; |
| |
| if (texture) { |
| data->surface = (SDL_Surface *)texture->driverdata; |
| } else { |
| data->surface = data->window; |
| } |
| return 0; |
| } |
| |
| static int SW_QueueSetViewport(SDL_Renderer *renderer, SDL_RenderCommand *cmd) |
| { |
| return 0; /* nothing to do in this backend. */ |
| } |
| |
| static int SW_QueueDrawPoints(SDL_Renderer *renderer, SDL_RenderCommand *cmd, const SDL_FPoint *points, int count) |
| { |
| SDL_Point *verts = (SDL_Point *)SDL_AllocateRenderVertices(renderer, count * sizeof(SDL_Point), 0, &cmd->data.draw.first); |
| int i; |
| |
| if (verts == NULL) { |
| return -1; |
| } |
| |
| cmd->data.draw.count = count; |
| |
| for (i = 0; i < count; i++, verts++, points++) { |
| verts->x = (int)points->x; |
| verts->y = (int)points->y; |
| } |
| |
| return 0; |
| } |
| |
| static int SW_QueueFillRects(SDL_Renderer *renderer, SDL_RenderCommand *cmd, const SDL_FRect *rects, int count) |
| { |
| SDL_Rect *verts = (SDL_Rect *)SDL_AllocateRenderVertices(renderer, count * sizeof(SDL_Rect), 0, &cmd->data.draw.first); |
| int i; |
| |
| if (verts == NULL) { |
| return -1; |
| } |
| |
| cmd->data.draw.count = count; |
| |
| for (i = 0; i < count; i++, verts++, rects++) { |
| verts->x = (int)rects->x; |
| verts->y = (int)rects->y; |
| verts->w = SDL_max((int)rects->w, 1); |
| verts->h = SDL_max((int)rects->h, 1); |
| } |
| |
| return 0; |
| } |
| |
| static int SW_QueueCopy(SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_Texture *texture, |
| const SDL_Rect *srcrect, const SDL_FRect *dstrect) |
| { |
| SDL_Rect *verts = (SDL_Rect *)SDL_AllocateRenderVertices(renderer, 2 * sizeof(SDL_Rect), 0, &cmd->data.draw.first); |
| |
| if (verts == NULL) { |
| return -1; |
| } |
| |
| cmd->data.draw.count = 1; |
| |
| SDL_copyp(verts, srcrect); |
| verts++; |
| |
| verts->x = (int)dstrect->x; |
| verts->y = (int)dstrect->y; |
| verts->w = (int)dstrect->w; |
| verts->h = (int)dstrect->h; |
| |
| return 0; |
| } |
| |
| typedef struct CopyExData |
| { |
| SDL_Rect srcrect; |
| SDL_Rect dstrect; |
| double angle; |
| SDL_FPoint center; |
| SDL_RendererFlip flip; |
| float scale_x; |
| float scale_y; |
| } CopyExData; |
| |
| static int SW_QueueCopyEx(SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_Texture *texture, |
| const SDL_Rect *srcrect, const SDL_FRect *dstrect, |
| const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip, float scale_x, float scale_y) |
| { |
| CopyExData *verts = (CopyExData *)SDL_AllocateRenderVertices(renderer, sizeof(CopyExData), 0, &cmd->data.draw.first); |
| |
| if (verts == NULL) { |
| return -1; |
| } |
| |
| cmd->data.draw.count = 1; |
| |
| SDL_copyp(&verts->srcrect, srcrect); |
| |
| verts->dstrect.x = (int)dstrect->x; |
| verts->dstrect.y = (int)dstrect->y; |
| verts->dstrect.w = (int)dstrect->w; |
| verts->dstrect.h = (int)dstrect->h; |
| verts->angle = angle; |
| SDL_copyp(&verts->center, center); |
| verts->flip = flip; |
| verts->scale_x = scale_x; |
| verts->scale_y = scale_y; |
| |
| return 0; |
| } |
| |
| static int Blit_to_Screen(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *surface, SDL_Rect *dstrect, |
| float scale_x, float scale_y, SDL_ScaleMode scaleMode) |
| { |
| int retval; |
| /* Renderer scaling, if needed */ |
| if (scale_x != 1.0f || scale_y != 1.0f) { |
| SDL_Rect r; |
| r.x = (int)((float)dstrect->x * scale_x); |
| r.y = (int)((float)dstrect->y * scale_y); |
| r.w = (int)((float)dstrect->w * scale_x); |
| r.h = (int)((float)dstrect->h * scale_y); |
| retval = SDL_PrivateUpperBlitScaled(src, srcrect, surface, &r, scaleMode); |
| } else { |
| retval = SDL_BlitSurface(src, srcrect, surface, dstrect); |
| } |
| return retval; |
| } |
| |
| static int SW_RenderCopyEx(SDL_Renderer *renderer, SDL_Surface *surface, SDL_Texture *texture, |
| const SDL_Rect *srcrect, const SDL_Rect *final_rect, |
| const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip, float scale_x, float scale_y) |
| { |
| SDL_Surface *src = (SDL_Surface *)texture->driverdata; |
| SDL_Rect tmp_rect; |
| SDL_Surface *src_clone, *src_rotated, *src_scaled; |
| SDL_Surface *mask = NULL, *mask_rotated = NULL; |
| int retval = 0; |
| SDL_BlendMode blendmode; |
| Uint8 alphaMod, rMod, gMod, bMod; |
| int applyModulation = SDL_FALSE; |
| int blitRequired = SDL_FALSE; |
| int isOpaque = SDL_FALSE; |
| |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| tmp_rect.x = 0; |
| tmp_rect.y = 0; |
| tmp_rect.w = final_rect->w; |
| tmp_rect.h = final_rect->h; |
| |
| /* It is possible to encounter an RLE encoded surface here and locking it is |
| * necessary because this code is going to access the pixel buffer directly. |
| */ |
| if (SDL_MUSTLOCK(src)) { |
| SDL_LockSurface(src); |
| } |
| |
| /* Clone the source surface but use its pixel buffer directly. |
| * The original source surface must be treated as read-only. |
| */ |
| src_clone = SDL_CreateRGBSurfaceFrom(src->pixels, src->w, src->h, src->format->BitsPerPixel, src->pitch, |
| src->format->Rmask, src->format->Gmask, |
| src->format->Bmask, src->format->Amask); |
| if (src_clone == NULL) { |
| if (SDL_MUSTLOCK(src)) { |
| SDL_UnlockSurface(src); |
| } |
| return -1; |
| } |
| |
| SDL_GetSurfaceBlendMode(src, &blendmode); |
| SDL_GetSurfaceAlphaMod(src, &alphaMod); |
| SDL_GetSurfaceColorMod(src, &rMod, &gMod, &bMod); |
| |
| /* SDLgfx_rotateSurface only accepts 32-bit surfaces with a 8888 layout. Everything else has to be converted. */ |
| if (src->format->BitsPerPixel != 32 || SDL_PIXELLAYOUT(src->format->format) != SDL_PACKEDLAYOUT_8888 || !src->format->Amask) { |
| blitRequired = SDL_TRUE; |
| } |
| |
| /* If scaling and cropping is necessary, it has to be taken care of before the rotation. */ |
| if (!(srcrect->w == final_rect->w && srcrect->h == final_rect->h && srcrect->x == 0 && srcrect->y == 0)) { |
| blitRequired = SDL_TRUE; |
| } |
| |
| /* srcrect is not selecting the whole src surface, so cropping is needed */ |
| if (!(srcrect->w == src->w && srcrect->h == src->h && srcrect->x == 0 && srcrect->y == 0)) { |
| blitRequired = SDL_TRUE; |
| } |
| |
| /* The color and alpha modulation has to be applied before the rotation when using the NONE, MOD or MUL blend modes. */ |
| if ((blendmode == SDL_BLENDMODE_NONE || blendmode == SDL_BLENDMODE_MOD || blendmode == SDL_BLENDMODE_MUL) && (alphaMod & rMod & gMod & bMod) != 255) { |
| applyModulation = SDL_TRUE; |
| SDL_SetSurfaceAlphaMod(src_clone, alphaMod); |
| SDL_SetSurfaceColorMod(src_clone, rMod, gMod, bMod); |
| } |
| |
| /* Opaque surfaces are much easier to handle with the NONE blend mode. */ |
| if (blendmode == SDL_BLENDMODE_NONE && !src->format->Amask && alphaMod == 255) { |
| isOpaque = SDL_TRUE; |
| } |
| |
| /* The NONE blend mode requires a mask for non-opaque surfaces. This mask will be used |
| * to clear the pixels in the destination surface. The other steps are explained below. |
| */ |
| if (blendmode == SDL_BLENDMODE_NONE && !isOpaque) { |
| mask = SDL_CreateRGBSurface(0, final_rect->w, final_rect->h, 32, |
| 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000); |
| if (mask == NULL) { |
| retval = -1; |
| } else { |
| SDL_SetSurfaceBlendMode(mask, SDL_BLENDMODE_MOD); |
| } |
| } |
| |
| /* Create a new surface should there be a format mismatch or if scaling, cropping, |
| * or modulation is required. It's possible to use the source surface directly otherwise. |
| */ |
| if (!retval && (blitRequired || applyModulation)) { |
| SDL_Rect scale_rect = tmp_rect; |
| src_scaled = SDL_CreateRGBSurface(0, final_rect->w, final_rect->h, 32, |
| 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000); |
| if (src_scaled == NULL) { |
| retval = -1; |
| } else { |
| SDL_SetSurfaceBlendMode(src_clone, SDL_BLENDMODE_NONE); |
| retval = SDL_PrivateUpperBlitScaled(src_clone, srcrect, src_scaled, &scale_rect, texture->scaleMode); |
| SDL_FreeSurface(src_clone); |
| src_clone = src_scaled; |
| src_scaled = NULL; |
| } |
| } |
| |
| /* SDLgfx_rotateSurface is going to make decisions depending on the blend mode. */ |
| SDL_SetSurfaceBlendMode(src_clone, blendmode); |
| |
| if (!retval) { |
| SDL_Rect rect_dest; |
| double cangle, sangle; |
| |
| SDLgfx_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, angle, center, |
| &rect_dest, &cangle, &sangle); |
| src_rotated = SDLgfx_rotateSurface(src_clone, angle, |
| (texture->scaleMode == SDL_ScaleModeNearest) ? 0 : 1, flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, |
| &rect_dest, cangle, sangle, center); |
| if (src_rotated == NULL) { |
| retval = -1; |
| } |
| if (!retval && mask != NULL) { |
| /* The mask needed for the NONE blend mode gets rotated with the same parameters. */ |
| mask_rotated = SDLgfx_rotateSurface(mask, angle, |
| SDL_FALSE, 0, 0, |
| &rect_dest, cangle, sangle, center); |
| if (mask_rotated == NULL) { |
| retval = -1; |
| } |
| } |
| if (!retval) { |
| |
| tmp_rect.x = final_rect->x + rect_dest.x; |
| tmp_rect.y = final_rect->y + rect_dest.y; |
| tmp_rect.w = rect_dest.w; |
| tmp_rect.h = rect_dest.h; |
| |
| /* The NONE blend mode needs some special care with non-opaque surfaces. |
| * Other blend modes or opaque surfaces can be blitted directly. |
| */ |
| if (blendmode != SDL_BLENDMODE_NONE || isOpaque) { |
| if (applyModulation == SDL_FALSE) { |
| /* If the modulation wasn't already applied, make it happen now. */ |
| SDL_SetSurfaceAlphaMod(src_rotated, alphaMod); |
| SDL_SetSurfaceColorMod(src_rotated, rMod, gMod, bMod); |
| } |
| /* Renderer scaling, if needed */ |
| retval = Blit_to_Screen(src_rotated, NULL, surface, &tmp_rect, scale_x, scale_y, texture->scaleMode); |
| } else { |
| /* The NONE blend mode requires three steps to get the pixels onto the destination surface. |
| * First, the area where the rotated pixels will be blitted to get set to zero. |
| * This is accomplished by simply blitting a mask with the NONE blend mode. |
| * The colorkey set by the rotate function will discard the correct pixels. |
| */ |
| SDL_Rect mask_rect = tmp_rect; |
| SDL_SetSurfaceBlendMode(mask_rotated, SDL_BLENDMODE_NONE); |
| /* Renderer scaling, if needed */ |
| retval = Blit_to_Screen(mask_rotated, NULL, surface, &mask_rect, scale_x, scale_y, texture->scaleMode); |
| if (!retval) { |
| /* The next step copies the alpha value. This is done with the BLEND blend mode and |
| * by modulating the source colors with 0. Since the destination is all zeros, this |
| * will effectively set the destination alpha to the source alpha. |
| */ |
| SDL_SetSurfaceColorMod(src_rotated, 0, 0, 0); |
| mask_rect = tmp_rect; |
| /* Renderer scaling, if needed */ |
| retval = Blit_to_Screen(src_rotated, NULL, surface, &mask_rect, scale_x, scale_y, texture->scaleMode); |
| if (!retval) { |
| /* The last step gets the color values in place. The ADD blend mode simply adds them to |
| * the destination (where the color values are all zero). However, because the ADD blend |
| * mode modulates the colors with the alpha channel, a surface without an alpha mask needs |
| * to be created. This makes all source pixels opaque and the colors get copied correctly. |
| */ |
| SDL_Surface *src_rotated_rgb; |
| src_rotated_rgb = SDL_CreateRGBSurfaceFrom(src_rotated->pixels, src_rotated->w, src_rotated->h, |
| src_rotated->format->BitsPerPixel, src_rotated->pitch, |
| src_rotated->format->Rmask, src_rotated->format->Gmask, |
| src_rotated->format->Bmask, 0); |
| if (src_rotated_rgb == NULL) { |
| retval = -1; |
| } else { |
| SDL_SetSurfaceBlendMode(src_rotated_rgb, SDL_BLENDMODE_ADD); |
| /* Renderer scaling, if needed */ |
| retval = Blit_to_Screen(src_rotated_rgb, NULL, surface, &tmp_rect, scale_x, scale_y, texture->scaleMode); |
| SDL_FreeSurface(src_rotated_rgb); |
| } |
| } |
| } |
| SDL_FreeSurface(mask_rotated); |
| } |
| if (src_rotated != NULL) { |
| SDL_FreeSurface(src_rotated); |
| } |
| } |
| } |
| |
| if (SDL_MUSTLOCK(src)) { |
| SDL_UnlockSurface(src); |
| } |
| if (mask != NULL) { |
| SDL_FreeSurface(mask); |
| } |
| if (src_clone != NULL) { |
| SDL_FreeSurface(src_clone); |
| } |
| return retval; |
| } |
| |
| typedef struct GeometryFillData |
| { |
| SDL_Point dst; |
| SDL_Color color; |
| } GeometryFillData; |
| |
| typedef struct GeometryCopyData |
| { |
| SDL_Point src; |
| SDL_Point dst; |
| SDL_Color color; |
| } GeometryCopyData; |
| |
| static int SW_QueueGeometry(SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_Texture *texture, |
| const float *xy, int xy_stride, const SDL_Color *color, int color_stride, const float *uv, int uv_stride, |
| int num_vertices, const void *indices, int num_indices, int size_indices, |
| float scale_x, float scale_y) |
| { |
| int i; |
| int count = indices ? num_indices : num_vertices; |
| void *verts; |
| size_t sz = texture != NULL ? sizeof(GeometryCopyData) : sizeof(GeometryFillData); |
| |
| verts = SDL_AllocateRenderVertices(renderer, count * sz, 0, &cmd->data.draw.first); |
| if (verts == NULL) { |
| return -1; |
| } |
| |
| cmd->data.draw.count = count; |
| size_indices = indices ? size_indices : 0; |
| |
| if (texture) { |
| GeometryCopyData *ptr = (GeometryCopyData *)verts; |
| for (i = 0; i < count; i++) { |
| int j; |
| float *xy_; |
| SDL_Color col_; |
| float *uv_; |
| if (size_indices == 4) { |
| j = ((const Uint32 *)indices)[i]; |
| } else if (size_indices == 2) { |
| j = ((const Uint16 *)indices)[i]; |
| } else if (size_indices == 1) { |
| j = ((const Uint8 *)indices)[i]; |
| } else { |
| j = i; |
| } |
| |
| xy_ = (float *)((char *)xy + j * xy_stride); |
| col_ = *(SDL_Color *)((char *)color + j * color_stride); |
| |
| uv_ = (float *)((char *)uv + j * uv_stride); |
| |
| ptr->src.x = (int)(uv_[0] * texture->w); |
| ptr->src.y = (int)(uv_[1] * texture->h); |
| |
| ptr->dst.x = (int)(xy_[0] * scale_x); |
| ptr->dst.y = (int)(xy_[1] * scale_y); |
| trianglepoint_2_fixedpoint(&ptr->dst); |
| |
| ptr->color = col_; |
| |
| ptr++; |
| } |
| } else { |
| GeometryFillData *ptr = (GeometryFillData *)verts; |
| |
| for (i = 0; i < count; i++) { |
| int j; |
| float *xy_; |
| SDL_Color col_; |
| if (size_indices == 4) { |
| j = ((const Uint32 *)indices)[i]; |
| } else if (size_indices == 2) { |
| j = ((const Uint16 *)indices)[i]; |
| } else if (size_indices == 1) { |
| j = ((const Uint8 *)indices)[i]; |
| } else { |
| j = i; |
| } |
| |
| xy_ = (float *)((char *)xy + j * xy_stride); |
| col_ = *(SDL_Color *)((char *)color + j * color_stride); |
| |
| ptr->dst.x = (int)(xy_[0] * scale_x); |
| ptr->dst.y = (int)(xy_[1] * scale_y); |
| trianglepoint_2_fixedpoint(&ptr->dst); |
| |
| ptr->color = col_; |
| |
| ptr++; |
| } |
| } |
| return 0; |
| } |
| |
| static void PrepTextureForCopy(const SDL_RenderCommand *cmd) |
| { |
| const Uint8 r = cmd->data.draw.r; |
| const Uint8 g = cmd->data.draw.g; |
| const Uint8 b = cmd->data.draw.b; |
| const Uint8 a = cmd->data.draw.a; |
| const SDL_BlendMode blend = cmd->data.draw.blend; |
| SDL_Texture *texture = cmd->data.draw.texture; |
| SDL_Surface *surface = (SDL_Surface *)texture->driverdata; |
| const SDL_bool colormod = ((r & g & b) != 0xFF); |
| const SDL_bool alphamod = (a != 0xFF); |
| const SDL_bool blending = ((blend == SDL_BLENDMODE_ADD) || (blend == SDL_BLENDMODE_MOD) || (blend == SDL_BLENDMODE_MUL)); |
| |
| if (colormod || alphamod || blending) { |
| SDL_SetSurfaceRLE(surface, 0); |
| } |
| |
| /* !!! FIXME: we can probably avoid some of these calls. */ |
| SDL_SetSurfaceColorMod(surface, r, g, b); |
| SDL_SetSurfaceAlphaMod(surface, a); |
| SDL_SetSurfaceBlendMode(surface, blend); |
| } |
| |
| static void SetDrawState(SDL_Surface *surface, SW_DrawStateCache *drawstate) |
| { |
| if (drawstate->surface_cliprect_dirty) { |
| const SDL_Rect *viewport = drawstate->viewport; |
| const SDL_Rect *cliprect = drawstate->cliprect; |
| SDL_assert_release(viewport != NULL); /* the higher level should have forced a SDL_RENDERCMD_SETVIEWPORT */ |
| |
| if (cliprect != NULL) { |
| SDL_Rect clip_rect; |
| clip_rect.x = cliprect->x + viewport->x; |
| clip_rect.y = cliprect->y + viewport->y; |
| clip_rect.w = cliprect->w; |
| clip_rect.h = cliprect->h; |
| SDL_IntersectRect(viewport, &clip_rect, &clip_rect); |
| SDL_SetClipRect(surface, &clip_rect); |
| } else { |
| SDL_SetClipRect(surface, drawstate->viewport); |
| } |
| drawstate->surface_cliprect_dirty = SDL_FALSE; |
| } |
| } |
| |
| static int SW_RunCommandQueue(SDL_Renderer *renderer, SDL_RenderCommand *cmd, void *vertices, size_t vertsize) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| SW_DrawStateCache drawstate; |
| |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| drawstate.viewport = NULL; |
| drawstate.cliprect = NULL; |
| drawstate.surface_cliprect_dirty = SDL_TRUE; |
| |
| while (cmd) { |
| switch (cmd->command) { |
| case SDL_RENDERCMD_SETDRAWCOLOR: { |
| break; /* Not used in this backend. */ |
| } |
| |
| case SDL_RENDERCMD_SETVIEWPORT: { |
| drawstate.viewport = &cmd->data.viewport.rect; |
| drawstate.surface_cliprect_dirty = SDL_TRUE; |
| break; |
| } |
| |
| case SDL_RENDERCMD_SETCLIPRECT: { |
| drawstate.cliprect = cmd->data.cliprect.enabled ? &cmd->data.cliprect.rect : NULL; |
| drawstate.surface_cliprect_dirty = SDL_TRUE; |
| break; |
| } |
| |
| case SDL_RENDERCMD_CLEAR: { |
| const Uint8 r = cmd->data.color.r; |
| const Uint8 g = cmd->data.color.g; |
| const Uint8 b = cmd->data.color.b; |
| const Uint8 a = cmd->data.color.a; |
| /* By definition the clear ignores the clip rect */ |
| SDL_SetClipRect(surface, NULL); |
| SDL_FillRect(surface, NULL, SDL_MapRGBA(surface->format, r, g, b, a)); |
| drawstate.surface_cliprect_dirty = SDL_TRUE; |
| break; |
| } |
| |
| case SDL_RENDERCMD_DRAW_POINTS: { |
| const Uint8 r = cmd->data.draw.r; |
| const Uint8 g = cmd->data.draw.g; |
| const Uint8 b = cmd->data.draw.b; |
| const Uint8 a = cmd->data.draw.a; |
| const int count = (int) cmd->data.draw.count; |
| SDL_Point *verts = (SDL_Point *) (((Uint8 *) vertices) + cmd->data.draw.first); |
| const SDL_BlendMode blend = cmd->data.draw.blend; |
| SetDrawState(surface, &drawstate); |
| |
| /* Apply viewport */ |
| if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) { |
| int i; |
| for (i = 0; i < count; i++) { |
| verts[i].x += drawstate.viewport->x; |
| verts[i].y += drawstate.viewport->y; |
| } |
| } |
| |
| if (blend == SDL_BLENDMODE_NONE) { |
| SDL_DrawPoints(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a)); |
| } else { |
| SDL_BlendPoints(surface, verts, count, blend, r, g, b, a); |
| } |
| break; |
| } |
| |
| case SDL_RENDERCMD_DRAW_LINES: { |
| const Uint8 r = cmd->data.draw.r; |
| const Uint8 g = cmd->data.draw.g; |
| const Uint8 b = cmd->data.draw.b; |
| const Uint8 a = cmd->data.draw.a; |
| const int count = (int) cmd->data.draw.count; |
| SDL_Point *verts = (SDL_Point *) (((Uint8 *) vertices) + cmd->data.draw.first); |
| const SDL_BlendMode blend = cmd->data.draw.blend; |
| SetDrawState(surface, &drawstate); |
| |
| /* Apply viewport */ |
| if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) { |
| int i; |
| for (i = 0; i < count; i++) { |
| verts[i].x += drawstate.viewport->x; |
| verts[i].y += drawstate.viewport->y; |
| } |
| } |
| |
| if (blend == SDL_BLENDMODE_NONE) { |
| SDL_DrawLines(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a)); |
| } else { |
| SDL_BlendLines(surface, verts, count, blend, r, g, b, a); |
| } |
| break; |
| } |
| |
| case SDL_RENDERCMD_FILL_RECTS: { |
| const Uint8 r = cmd->data.draw.r; |
| const Uint8 g = cmd->data.draw.g; |
| const Uint8 b = cmd->data.draw.b; |
| const Uint8 a = cmd->data.draw.a; |
| const int count = (int) cmd->data.draw.count; |
| SDL_Rect *verts = (SDL_Rect *) (((Uint8 *) vertices) + cmd->data.draw.first); |
| const SDL_BlendMode blend = cmd->data.draw.blend; |
| SetDrawState(surface, &drawstate); |
| |
| /* Apply viewport */ |
| if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) { |
| int i; |
| for (i = 0; i < count; i++) { |
| verts[i].x += drawstate.viewport->x; |
| verts[i].y += drawstate.viewport->y; |
| } |
| } |
| |
| if (blend == SDL_BLENDMODE_NONE) { |
| SDL_FillRects(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a)); |
| } else { |
| SDL_BlendFillRects(surface, verts, count, blend, r, g, b, a); |
| } |
| break; |
| } |
| |
| case SDL_RENDERCMD_COPY: { |
| SDL_Rect *verts = (SDL_Rect *) (((Uint8 *) vertices) + cmd->data.draw.first); |
| const SDL_Rect *srcrect = verts; |
| SDL_Rect *dstrect = verts + 1; |
| SDL_Texture *texture = cmd->data.draw.texture; |
| SDL_Surface *src = (SDL_Surface *) texture->driverdata; |
| |
| SetDrawState(surface, &drawstate); |
| |
| PrepTextureForCopy(cmd); |
| |
| /* Apply viewport */ |
| if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) { |
| dstrect->x += drawstate.viewport->x; |
| dstrect->y += drawstate.viewport->y; |
| } |
| |
| if ( srcrect->w == dstrect->w && srcrect->h == dstrect->h ) { |
| SDL_BlitSurface(src, srcrect, surface, dstrect); |
| } else { |
| /* If scaling is ever done, permanently disable RLE (which doesn't support scaling) |
| * to avoid potentially frequent RLE encoding/decoding. |
| */ |
| SDL_SetSurfaceRLE(surface, 0); |
| |
| /* Prevent to do scaling + clipping on viewport boundaries as it may lose proportion */ |
| if (dstrect->x < 0 || dstrect->y < 0 || dstrect->x + dstrect->w > surface->w || dstrect->y + dstrect->h > surface->h) { |
| SDL_Surface *tmp = SDL_CreateRGBSurfaceWithFormat(0, dstrect->w, dstrect->h, 0, src->format->format); |
| /* Scale to an intermediate surface, then blit */ |
| if (tmp) { |
| SDL_Rect r; |
| SDL_BlendMode blendmode; |
| Uint8 alphaMod, rMod, gMod, bMod; |
| |
| SDL_GetSurfaceBlendMode(src, &blendmode); |
| SDL_GetSurfaceAlphaMod(src, &alphaMod); |
| SDL_GetSurfaceColorMod(src, &rMod, &gMod, &bMod); |
| |
| r.x = 0; |
| r.y = 0; |
| r.w = dstrect->w; |
| r.h = dstrect->h; |
| |
| SDL_SetSurfaceBlendMode(src, SDL_BLENDMODE_NONE); |
| SDL_SetSurfaceColorMod(src, 255, 255, 255); |
| SDL_SetSurfaceAlphaMod(src, 255); |
| |
| SDL_PrivateUpperBlitScaled(src, srcrect, tmp, &r, texture->scaleMode); |
| |
| SDL_SetSurfaceColorMod(tmp, rMod, gMod, bMod); |
| SDL_SetSurfaceAlphaMod(tmp, alphaMod); |
| SDL_SetSurfaceBlendMode(tmp, blendmode); |
| |
| SDL_BlitSurface(tmp, NULL, surface, dstrect); |
| SDL_FreeSurface(tmp); |
| /* No need to set back r/g/b/a/blendmode to 'src' since it's done in PrepTextureForCopy() */ |
| } |
| } else{ |
| SDL_PrivateUpperBlitScaled(src, srcrect, surface, dstrect, texture->scaleMode); |
| } |
| } |
| break; |
| } |
| |
| case SDL_RENDERCMD_COPY_EX: { |
| CopyExData *copydata = (CopyExData *) (((Uint8 *) vertices) + cmd->data.draw.first); |
| SetDrawState(surface, &drawstate); |
| PrepTextureForCopy(cmd); |
| |
| /* Apply viewport */ |
| if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) { |
| copydata->dstrect.x += drawstate.viewport->x; |
| copydata->dstrect.y += drawstate.viewport->y; |
| } |
| |
| SW_RenderCopyEx(renderer, surface, cmd->data.draw.texture, ©data->srcrect, |
| ©data->dstrect, copydata->angle, ©data->center, copydata->flip, |
| copydata->scale_x, copydata->scale_y); |
| break; |
| } |
| |
| case SDL_RENDERCMD_GEOMETRY: { |
| int i; |
| SDL_Rect *verts = (SDL_Rect *) (((Uint8 *) vertices) + cmd->data.draw.first); |
| const int count = (int) cmd->data.draw.count; |
| SDL_Texture *texture = cmd->data.draw.texture; |
| const SDL_BlendMode blend = cmd->data.draw.blend; |
| |
| SetDrawState(surface, &drawstate); |
| |
| if (texture) { |
| SDL_Surface *src = (SDL_Surface *) texture->driverdata; |
| |
| GeometryCopyData *ptr = (GeometryCopyData *) verts; |
| |
| PrepTextureForCopy(cmd); |
| |
| /* Apply viewport */ |
| if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) { |
| SDL_Point vp; |
| vp.x = drawstate.viewport->x; |
| vp.y = drawstate.viewport->y; |
| trianglepoint_2_fixedpoint(&vp); |
| for (i = 0; i < count; i++) { |
| ptr[i].dst.x += vp.x; |
| ptr[i].dst.y += vp.y; |
| } |
| } |
| |
| for (i = 0; i < count; i += 3, ptr += 3) { |
| SDL_SW_BlitTriangle( |
| src, |
| &(ptr[0].src), &(ptr[1].src), &(ptr[2].src), |
| surface, |
| &(ptr[0].dst), &(ptr[1].dst), &(ptr[2].dst), |
| ptr[0].color, ptr[1].color, ptr[2].color); |
| } |
| } else { |
| GeometryFillData *ptr = (GeometryFillData *) verts; |
| |
| /* Apply viewport */ |
| if (drawstate.viewport != NULL && (drawstate.viewport->x || drawstate.viewport->y)) { |
| SDL_Point vp; |
| vp.x = drawstate.viewport->x; |
| vp.y = drawstate.viewport->y; |
| trianglepoint_2_fixedpoint(&vp); |
| for (i = 0; i < count; i++) { |
| ptr[i].dst.x += vp.x; |
| ptr[i].dst.y += vp.y; |
| } |
| } |
| |
| for (i = 0; i < count; i += 3, ptr += 3) { |
| SDL_SW_FillTriangle(surface, &(ptr[0].dst), &(ptr[1].dst), &(ptr[2].dst), blend, ptr[0].color, ptr[1].color, ptr[2].color); |
| } |
| } |
| break; |
| } |
| |
| case SDL_RENDERCMD_NO_OP: |
| break; |
| } |
| |
| cmd = cmd->next; |
| } |
| |
| return 0; |
| } |
| |
| static int SW_RenderReadPixels(SDL_Renderer *renderer, const SDL_Rect *rect, |
| Uint32 format, void *pixels, int pitch) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| Uint32 src_format; |
| void *src_pixels; |
| |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| /* NOTE: The rect is already adjusted according to the viewport by |
| * SDL_RenderReadPixels. |
| */ |
| |
| if (rect->x < 0 || rect->x + rect->w > surface->w || |
| rect->y < 0 || rect->y + rect->h > surface->h) { |
| return SDL_SetError("Tried to read outside of surface bounds"); |
| } |
| |
| src_format = surface->format->format; |
| src_pixels = (void *)((Uint8 *)surface->pixels + |
| rect->y * surface->pitch + |
| rect->x * surface->format->BytesPerPixel); |
| |
| return SDL_ConvertPixels(rect->w, rect->h, |
| src_format, src_pixels, surface->pitch, |
| format, pixels, pitch); |
| } |
| |
| static int SW_RenderPresent(SDL_Renderer *renderer) |
| { |
| SDL_Window *window = renderer->window; |
| |
| if (window == NULL) { |
| return -1; |
| } |
| return SDL_UpdateWindowSurface(window); |
| } |
| |
| static void SW_DestroyTexture(SDL_Renderer *renderer, SDL_Texture *texture) |
| { |
| SDL_Surface *surface = (SDL_Surface *)texture->driverdata; |
| |
| SDL_FreeSurface(surface); |
| } |
| |
| static void SW_DestroyRenderer(SDL_Renderer *renderer) |
| { |
| SDL_Window *window = renderer->window; |
| SW_RenderData *data = (SW_RenderData *)renderer->driverdata; |
| |
| if (window) { |
| SDL_DestroyWindowSurface(window); |
| } |
| SDL_free(data); |
| SDL_free(renderer); |
| } |
| |
| SDL_Renderer *SW_CreateRendererForSurface(SDL_Surface *surface) |
| { |
| SDL_Renderer *renderer; |
| SW_RenderData *data; |
| |
| if (surface == NULL) { |
| SDL_InvalidParamError("surface"); |
| return NULL; |
| } |
| |
| renderer = (SDL_Renderer *)SDL_calloc(1, sizeof(*renderer)); |
| if (renderer == NULL) { |
| SDL_OutOfMemory(); |
| return NULL; |
| } |
| |
| data = (SW_RenderData *)SDL_calloc(1, sizeof(*data)); |
| if (data == NULL) { |
| SW_DestroyRenderer(renderer); |
| SDL_OutOfMemory(); |
| return NULL; |
| } |
| data->surface = surface; |
| data->window = surface; |
| |
| renderer->WindowEvent = SW_WindowEvent; |
| renderer->GetOutputSize = SW_GetOutputSize; |
| renderer->CreateTexture = SW_CreateTexture; |
| renderer->UpdateTexture = SW_UpdateTexture; |
| renderer->LockTexture = SW_LockTexture; |
| renderer->UnlockTexture = SW_UnlockTexture; |
| renderer->SetTextureScaleMode = SW_SetTextureScaleMode; |
| renderer->SetRenderTarget = SW_SetRenderTarget; |
| renderer->QueueSetViewport = SW_QueueSetViewport; |
| renderer->QueueSetDrawColor = SW_QueueSetViewport; /* SetViewport and SetDrawColor are (currently) no-ops. */ |
| renderer->QueueDrawPoints = SW_QueueDrawPoints; |
| renderer->QueueDrawLines = SW_QueueDrawPoints; /* lines and points queue vertices the same way. */ |
| renderer->QueueFillRects = SW_QueueFillRects; |
| renderer->QueueCopy = SW_QueueCopy; |
| renderer->QueueCopyEx = SW_QueueCopyEx; |
| renderer->QueueGeometry = SW_QueueGeometry; |
| renderer->RunCommandQueue = SW_RunCommandQueue; |
| renderer->RenderReadPixels = SW_RenderReadPixels; |
| renderer->RenderPresent = SW_RenderPresent; |
| renderer->DestroyTexture = SW_DestroyTexture; |
| renderer->DestroyRenderer = SW_DestroyRenderer; |
| renderer->info = SW_RenderDriver.info; |
| renderer->driverdata = data; |
| |
| return renderer; |
| } |
| |
| static SDL_Renderer *SW_CreateRenderer(SDL_Window *window, Uint32 flags) |
| { |
| const char *hint; |
| SDL_Surface *surface; |
| SDL_bool no_hint_set; |
| |
| /* Set the vsync hint based on our flags, if it's not already set */ |
| hint = SDL_GetHint(SDL_HINT_RENDER_VSYNC); |
| if (hint == NULL || !*hint) { |
| no_hint_set = SDL_TRUE; |
| } else { |
| no_hint_set = SDL_FALSE; |
| } |
| |
| if (no_hint_set) { |
| SDL_SetHint(SDL_HINT_RENDER_VSYNC, (flags & SDL_RENDERER_PRESENTVSYNC) ? "1" : "0"); |
| } |
| |
| surface = SDL_GetWindowSurface(window); |
| |
| /* Reset the vsync hint if we set it above */ |
| if (no_hint_set) { |
| SDL_SetHint(SDL_HINT_RENDER_VSYNC, ""); |
| } |
| |
| if (surface == NULL) { |
| return NULL; |
| } |
| return SW_CreateRendererForSurface(surface); |
| } |
| |
| SDL_RenderDriver SW_RenderDriver = { |
| SW_CreateRenderer, |
| { |
| "software", |
| SDL_RENDERER_SOFTWARE | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE, |
| 8, |
| { |
| SDL_PIXELFORMAT_ARGB8888, |
| SDL_PIXELFORMAT_ABGR8888, |
| SDL_PIXELFORMAT_RGBA8888, |
| SDL_PIXELFORMAT_BGRA8888, |
| SDL_PIXELFORMAT_RGB888, |
| SDL_PIXELFORMAT_BGR888, |
| SDL_PIXELFORMAT_RGB565, |
| SDL_PIXELFORMAT_RGB555 |
| }, |
| 0, |
| 0} |
| }; |
| |
| #endif /* SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
