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https://github.com/libsdl-org/SDL.git
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Added SDL_RenderTextureTiled()
This commit is contained in:
Sam Lantinga
parent
9e55ee9391
commit
198caa54a1
6 changed files with 385 additions and 71 deletions
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@ -3729,52 +3729,10 @@ int SDL_RenderFillRects(SDL_Renderer *renderer, const SDL_FRect *rects, int coun
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return retval;
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}
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int SDL_RenderTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_FRect *srcrect, const SDL_FRect *dstrect)
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static int SDL_RenderTextureInternal(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_FRect *srcrect, const SDL_FRect *dstrect)
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{
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SDL_FRect real_srcrect;
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SDL_FRect real_dstrect;
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int retval;
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int use_rendergeometry;
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CHECK_RENDERER_MAGIC(renderer, -1);
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CHECK_TEXTURE_MAGIC(texture, -1);
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if (renderer != texture->renderer) {
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return SDL_SetError("Texture was not created with this renderer");
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}
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#if DONT_DRAW_WHILE_HIDDEN
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/* Don't draw while we're hidden */
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if (renderer->hidden) {
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return 0;
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}
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#endif
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use_rendergeometry = (!renderer->QueueCopy);
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real_srcrect.x = 0.0f;
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real_srcrect.y = 0.0f;
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real_srcrect.w = (float)texture->w;
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real_srcrect.h = (float)texture->h;
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if (srcrect) {
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if (!SDL_GetRectIntersectionFloat(srcrect, &real_srcrect, &real_srcrect)) {
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return 0;
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}
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}
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GetRenderViewportSize(renderer, &real_dstrect);
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if (dstrect) {
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if (!SDL_HasRectIntersectionFloat(dstrect, &real_dstrect)) {
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return 0;
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}
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real_dstrect = *dstrect;
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}
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if (texture->native) {
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texture = texture->native;
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}
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texture->last_command_generation = renderer->render_command_generation;
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SDL_bool use_rendergeometry = (!renderer->QueueCopy);
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if (use_rendergeometry) {
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float xy[8];
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@ -3788,15 +3746,15 @@ int SDL_RenderTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_FR
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float minu, minv, maxu, maxv;
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float minx, miny, maxx, maxy;
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minu = real_srcrect.x / texture->w;
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minv = real_srcrect.y / texture->h;
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maxu = (real_srcrect.x + real_srcrect.w) / texture->w;
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maxv = (real_srcrect.y + real_srcrect.h) / texture->h;
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minu = srcrect->x / texture->w;
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minv = srcrect->y / texture->h;
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maxu = (srcrect->x + srcrect->w) / texture->w;
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maxv = (srcrect->y + srcrect->h) / texture->h;
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minx = real_dstrect.x;
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miny = real_dstrect.y;
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maxx = real_dstrect.x + real_dstrect.w;
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maxy = real_dstrect.y + real_dstrect.h;
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minx = dstrect->x;
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miny = dstrect->y;
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maxx = dstrect->x + dstrect->w;
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maxy = dstrect->y + dstrect->h;
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uv[0] = minu;
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uv[1] = minv;
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@ -3823,17 +3781,64 @@ int SDL_RenderTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_FR
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renderer->view->scale.x,
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renderer->view->scale.y, SDL_TEXTURE_ADDRESS_CLAMP);
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} else {
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SDL_FRect rect;
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real_dstrect.x *= renderer->view->scale.x;
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real_dstrect.y *= renderer->view->scale.y;
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real_dstrect.w *= renderer->view->scale.x;
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real_dstrect.h *= renderer->view->scale.y;
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rect.x = dstrect->x * renderer->view->scale.x;
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rect.y = dstrect->y * renderer->view->scale.y;
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rect.w = dstrect->w * renderer->view->scale.x;
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rect.h = dstrect->h * renderer->view->scale.y;
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retval = QueueCmdCopy(renderer, texture, &real_srcrect, &real_dstrect);
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retval = QueueCmdCopy(renderer, texture, srcrect, &rect);
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}
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return retval;
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}
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int SDL_RenderTexture(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_FRect *srcrect, const SDL_FRect *dstrect)
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{
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SDL_FRect real_srcrect;
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SDL_FRect real_dstrect;
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CHECK_RENDERER_MAGIC(renderer, -1);
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CHECK_TEXTURE_MAGIC(texture, -1);
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if (renderer != texture->renderer) {
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return SDL_SetError("Texture was not created with this renderer");
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}
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#if DONT_DRAW_WHILE_HIDDEN
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/* Don't draw while we're hidden */
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if (renderer->hidden) {
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return 0;
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}
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#endif
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real_srcrect.x = 0.0f;
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real_srcrect.y = 0.0f;
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real_srcrect.w = (float)texture->w;
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real_srcrect.h = (float)texture->h;
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if (srcrect) {
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if (!SDL_GetRectIntersectionFloat(srcrect, &real_srcrect, &real_srcrect)) {
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return 0;
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}
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}
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GetRenderViewportSize(renderer, &real_dstrect);
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if (dstrect) {
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if (!SDL_HasRectIntersectionFloat(dstrect, &real_dstrect)) {
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return 0;
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}
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real_dstrect = *dstrect;
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}
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if (texture->native) {
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texture = texture->native;
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}
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texture->last_command_generation = renderer->render_command_generation;
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return SDL_RenderTextureInternal(renderer, texture, &real_srcrect, &real_dstrect);
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}
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int SDL_RenderTextureRotated(SDL_Renderer *renderer, SDL_Texture *texture,
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const SDL_FRect *srcrect, const SDL_FRect *dstrect,
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const double angle, const SDL_FPoint *center, const SDL_FlipMode flip)
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@ -3989,6 +3994,172 @@ int SDL_RenderTextureRotated(SDL_Renderer *renderer, SDL_Texture *texture,
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return retval;
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}
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static int SDL_RenderTextureTiled_Wrap(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_FRect *srcrect, float scale, const SDL_FRect *dstrect)
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{
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float xy[8];
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const int xy_stride = 2 * sizeof(float);
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float uv[8];
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const int uv_stride = 2 * sizeof(float);
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const int num_vertices = 4;
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const int *indices = renderer->rect_index_order;
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const int num_indices = 6;
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const int size_indices = 4;
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float minu, minv, maxu, maxv;
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float minx, miny, maxx, maxy;
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minu = 0.0f;
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minv = 0.0f;
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maxu = dstrect->w / (srcrect->w * scale);
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maxv = dstrect->h / (srcrect->h * scale);
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minx = dstrect->x;
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miny = dstrect->y;
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maxx = dstrect->x + dstrect->w;
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maxy = dstrect->y + dstrect->h;
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uv[0] = minu;
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uv[1] = minv;
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uv[2] = maxu;
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uv[3] = minv;
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uv[4] = maxu;
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uv[5] = maxv;
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uv[6] = minu;
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uv[7] = maxv;
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xy[0] = minx;
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xy[1] = miny;
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xy[2] = maxx;
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xy[3] = miny;
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xy[4] = maxx;
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xy[5] = maxy;
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xy[6] = minx;
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xy[7] = maxy;
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return QueueCmdGeometry(renderer, texture,
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xy, xy_stride, &texture->color, 0 /* color_stride */, uv, uv_stride,
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num_vertices,
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indices, num_indices, size_indices,
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renderer->view->scale.x,
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renderer->view->scale.y, SDL_TEXTURE_ADDRESS_WRAP);
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}
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static int SDL_RenderTextureTiled_Iterate(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_FRect *srcrect, float scale, const SDL_FRect *dstrect)
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{
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float tile_width = srcrect->w * scale;
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float tile_height = srcrect->h * scale;
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float float_rows, float_cols;
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float remaining_w = SDL_modff(dstrect->w / tile_width, &float_cols);
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float remaining_h = SDL_modff(dstrect->h / tile_height, &float_rows);
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float remaining_src_w = remaining_w * srcrect->w;
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float remaining_src_h = remaining_h * srcrect->h;
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float remaining_dst_w = remaining_w * tile_width;
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float remaining_dst_h = remaining_h * tile_height;
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int rows = (int)float_rows;
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int cols = (int)float_cols;
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SDL_FRect curr_src, curr_dst;
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SDL_copyp(&curr_src, srcrect);
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curr_dst.y = dstrect->y;
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curr_dst.w = tile_width;
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curr_dst.h = tile_height;
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for (int y = 0; y < rows; ++y) {
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curr_dst.x = dstrect->x;
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for (int x = 0; x < cols; ++x) {
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if (SDL_RenderTextureInternal(renderer, texture, &curr_src, &curr_dst) < 0) {
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return -1;
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}
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curr_dst.x += curr_dst.w;
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}
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if (remaining_dst_w > 0.0f) {
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curr_src.w = remaining_src_w;
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curr_dst.w = remaining_dst_w;
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if (SDL_RenderTextureInternal(renderer, texture, &curr_src, &curr_dst) < 0) {
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return -1;
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}
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curr_src.w = srcrect->w;
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curr_dst.w = tile_width;
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}
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curr_dst.y += curr_dst.h;
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}
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if (remaining_dst_h > 0.0f) {
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curr_src.h = remaining_src_h;
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curr_dst.h = remaining_dst_h;
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curr_dst.x = dstrect->x;
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for (int x = 0; x < cols; ++x) {
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if (SDL_RenderTextureInternal(renderer, texture, &curr_src, &curr_dst) < 0) {
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return -1;
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}
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curr_dst.x += curr_dst.w;
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}
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if (remaining_dst_w > 0.0f) {
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curr_src.w = remaining_src_w;
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curr_dst.w = remaining_dst_w;
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if (SDL_RenderTextureInternal(renderer, texture, &curr_src, &curr_dst) < 0) {
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return -1;
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}
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}
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}
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return 0;
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}
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int SDL_RenderTextureTiled(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_FRect *srcrect, float scale, const SDL_FRect *dstrect)
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{
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SDL_FRect real_srcrect;
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SDL_FRect real_dstrect;
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CHECK_RENDERER_MAGIC(renderer, -1);
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CHECK_TEXTURE_MAGIC(texture, -1);
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if (renderer != texture->renderer) {
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return SDL_SetError("Texture was not created with this renderer");
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}
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if (scale <= 0.0f) {
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return SDL_InvalidParamError("scale");
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}
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#if DONT_DRAW_WHILE_HIDDEN
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/* Don't draw while we're hidden */
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if (renderer->hidden) {
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return 0;
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}
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#endif
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real_srcrect.x = 0.0f;
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real_srcrect.y = 0.0f;
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real_srcrect.w = (float)texture->w;
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real_srcrect.h = (float)texture->h;
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if (srcrect) {
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if (!SDL_GetRectIntersectionFloat(srcrect, &real_srcrect, &real_srcrect)) {
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return 0;
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}
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}
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GetRenderViewportSize(renderer, &real_dstrect);
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if (dstrect) {
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if (!SDL_HasRectIntersectionFloat(dstrect, &real_dstrect)) {
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return 0;
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}
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real_dstrect = *dstrect;
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}
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if (texture->native) {
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texture = texture->native;
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}
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texture->last_command_generation = renderer->render_command_generation;
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// See if we can use geometry with repeating texture coordinates
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if (!renderer->software &&
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(!srcrect ||
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(real_srcrect.x == 0.0f && real_srcrect.y == 0.0f &&
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real_srcrect.w == (float)texture->w && real_srcrect.h == (float)texture->h))) {
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return SDL_RenderTextureTiled_Wrap(renderer, texture, &real_srcrect, scale, &real_dstrect);
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} else {
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return SDL_RenderTextureTiled_Iterate(renderer, texture, &real_srcrect, scale, &real_dstrect);
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}
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}
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int SDL_RenderGeometry(SDL_Renderer *renderer,
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SDL_Texture *texture,
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const SDL_Vertex *vertices, int num_vertices,
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