129 lines
3.8 KiB
C
129 lines
3.8 KiB
C
#include <assert.h>
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#include <stdio.h>
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#include "renwindow.h"
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#ifdef LITE_USE_SDL_RENDERER
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static int query_surface_scale(RenWindow *ren) {
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int w_pixels, h_pixels;
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int w_points, h_points;
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SDL_GL_GetDrawableSize(ren->window, &w_pixels, &h_pixels);
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SDL_GetWindowSize(ren->window, &w_points, &h_points);
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/* We consider that the ratio pixel/point will always be an integer and
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it is the same along the x and the y axis. */
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assert(w_pixels % w_points == 0 && h_pixels % h_points == 0 && w_pixels / w_points == h_pixels / h_points);
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return w_pixels / w_points;
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}
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static void setup_renderer(RenWindow *ren, int w, int h) {
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/* Note that w and h here should always be in pixels and obtained from
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a call to SDL_GL_GetDrawableSize(). */
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if (ren->renderer) {
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SDL_DestroyTexture(ren->texture);
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SDL_DestroyRenderer(ren->renderer);
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}
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ren->renderer = SDL_CreateRenderer(ren->window, -1, 0);
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ren->texture = SDL_CreateTexture(ren->renderer, SDL_PIXELFORMAT_BGRA32, SDL_TEXTUREACCESS_STREAMING, w, h);
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ren->surface_scale = query_surface_scale(ren);
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}
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#endif
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void renwin_init_surface(UNUSED RenWindow *ren) {
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#ifdef LITE_USE_SDL_RENDERER
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if (ren->surface) {
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SDL_FreeSurface(ren->surface);
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}
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int w, h;
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SDL_GL_GetDrawableSize(ren->window, &w, &h);
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ren->surface = SDL_CreateRGBSurfaceWithFormat(0, w, h, 32, SDL_PIXELFORMAT_BGRA32);
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if (!ren->surface) {
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fprintf(stderr, "Error creating surface: %s", SDL_GetError());
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exit(1);
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}
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setup_renderer(ren, w, h);
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#endif
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}
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int renwin_surface_scale(UNUSED RenWindow *ren) {
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#ifdef LITE_USE_SDL_RENDERER
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return ren->surface_scale;
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#else
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return 1;
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#endif
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}
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static RenRect scaled_rect(const RenRect rect, const int scale) {
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return (RenRect) {rect.x * scale, rect.y * scale, rect.width * scale, rect.height * scale};
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}
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void renwin_clip_to_surface(RenWindow *ren) {
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SDL_Surface *surface = renwin_get_surface(ren);
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ren->clip = (RenRect) {0, 0, surface->w, surface->h};
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}
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void renwin_set_clip_rect(RenWindow *ren, RenRect rect) {
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ren->clip = scaled_rect(rect, renwin_surface_scale(ren));
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}
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SDL_Surface *renwin_get_surface(RenWindow *ren) {
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#ifdef LITE_USE_SDL_RENDERER
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return ren->surface;
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#else
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SDL_Surface *surface = SDL_GetWindowSurface(ren->window);
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if (!surface) {
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fprintf(stderr, "Error getting window surface: %s", SDL_GetError());
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exit(1);
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}
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return surface;
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#endif
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}
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void renwin_resize_surface(UNUSED RenWindow *ren) {
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#ifdef LITE_USE_SDL_RENDERER
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int new_w, new_h;
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SDL_GL_GetDrawableSize(ren->window, &new_w, &new_h);
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/* Note that (w, h) may differ from (new_w, new_h) on retina displays. */
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if (new_w != ren->surface->w || new_h != ren->surface->h) {
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renwin_init_surface(ren);
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renwin_clip_to_surface(ren);
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setup_renderer(ren, new_w, new_h);
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}
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#endif
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}
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void renwin_show_window(RenWindow *ren) {
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SDL_ShowWindow(ren->window);
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}
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void renwin_update_rects(RenWindow *ren, RenRect *rects, int count) {
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#ifdef LITE_USE_SDL_RENDERER
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const int scale = ren->surface_scale;
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for (int i = 0; i < count; i++) {
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const RenRect *r = &rects[i];
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const int x = scale * r->x, y = scale * r->y;
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const int w = scale * r->width, h = scale * r->height;
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const SDL_Rect sr = {.x = x, .y = y, .w = w, .h = h};
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int32_t *pixels = ((int32_t *) ren->surface->pixels) + x + ren->surface->w * y;
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SDL_UpdateTexture(ren->texture, &sr, pixels, ren->surface->w * 4);
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}
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SDL_RenderCopy(ren->renderer, ren->texture, NULL, NULL);
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SDL_RenderPresent(ren->renderer);
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#else
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SDL_UpdateWindowSurfaceRects(ren->window, (SDL_Rect*) rects, count);
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#endif
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}
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void renwin_free(RenWindow *ren) {
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SDL_DestroyWindow(ren->window);
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ren->window = NULL;
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#ifdef LITE_USE_SDL_RENDERER
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SDL_DestroyTexture(ren->texture);
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SDL_DestroyRenderer(ren->renderer);
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SDL_FreeSurface(ren->surface);
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#endif
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}
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