290 lines
7.7 KiB
C++
290 lines
7.7 KiB
C++
#include "../Rendering.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string>
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#include "SDL.h"
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#include "../../WindowsWrapper.h"
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#include "../Misc.h"
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#include "../SDL2/Window.h"
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typedef struct RenderBackend_Surface
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{
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SDL_Surface *sdlsurface;
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} RenderBackend_Surface;
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typedef struct RenderBackend_Glyph
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{
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SDL_Surface *sdlsurface;
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} RenderBackend_Glyph;
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SDL_Window *window;
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static SDL_Surface *window_sdlsurface;
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static RenderBackend_Surface framebuffer;
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static unsigned char glyph_colour_channels[3];
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static SDL_Surface *glyph_destination_sdlsurface;
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static void RectToSDLRect(const RECT *rect, SDL_Rect *sdl_rect)
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{
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sdl_rect->x = (int)rect->left;
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sdl_rect->y = (int)rect->top;
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sdl_rect->w = (int)(rect->right - rect->left);
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sdl_rect->h = (int)(rect->bottom - rect->top);
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if (sdl_rect->w < 0)
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sdl_rect->w = 0;
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if (sdl_rect->h < 0)
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sdl_rect->h = 0;
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}
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RenderBackend_Surface* RenderBackend_Init(const char *window_title, int screen_width, int screen_height, BOOL fullscreen)
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{
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window = SDL_CreateWindow(window_title, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, screen_width, screen_height, 0);
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if (window != NULL)
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{
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if (fullscreen)
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{
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if (SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN) < 0)
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Backend_PrintError("Could not set window to fullscreen: %s", SDL_GetError());
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}
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window_sdlsurface = SDL_GetWindowSurface(window);
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if (window_sdlsurface != NULL)
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{
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framebuffer.sdlsurface = SDL_CreateRGBSurfaceWithFormat(0, window_sdlsurface->w, window_sdlsurface->h, 0, SDL_PIXELFORMAT_RGB24);
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if (framebuffer.sdlsurface != NULL)
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{
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Backend_PostWindowCreation();
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return &framebuffer;
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}
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std::string error_message = std::string("Could not create framebuffer surface: ") + SDL_GetError();
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Backend_ShowMessageBox("Fatal error (SDLSurface rendering backend)", error_message.c_str());
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}
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else
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{
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std::string error_message = std::string("Could not get SDL surface of the window: ") + SDL_GetError();
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Backend_ShowMessageBox("Fatal error (SDLSurface rendering backend)", error_message.c_str());
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}
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SDL_DestroyWindow(window);
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}
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else
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{
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std::string error_message = std::string("Could not create window: ") + SDL_GetError();
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Backend_ShowMessageBox("Fatal error (SDLSurface rendering backend)", error_message.c_str());
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}
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return NULL;
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}
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void RenderBackend_Deinit(void)
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{
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SDL_FreeSurface(framebuffer.sdlsurface);
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SDL_DestroyWindow(window);
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}
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void RenderBackend_DrawScreen(void)
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{
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if (SDL_BlitSurface(framebuffer.sdlsurface, NULL, window_sdlsurface, NULL) < 0)
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Backend_PrintError("Couldn't blit framebuffer surface to window surface: %s", SDL_GetError());
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if (SDL_UpdateWindowSurface(window) < 0)
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Backend_PrintError("Couldn't put window surface on screen: %s", SDL_GetError());
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}
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RenderBackend_Surface* RenderBackend_CreateSurface(unsigned int width, unsigned int height)
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{
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RenderBackend_Surface *surface = (RenderBackend_Surface*)malloc(sizeof(RenderBackend_Surface));
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if (surface == NULL)
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return NULL;
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surface->sdlsurface = SDL_CreateRGBSurfaceWithFormat(0, width, height, 0, SDL_PIXELFORMAT_RGB24);
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if (surface->sdlsurface == NULL)
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{
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free(surface);
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return NULL;
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}
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return surface;
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}
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void RenderBackend_FreeSurface(RenderBackend_Surface *surface)
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{
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if (surface == NULL)
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return;
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SDL_FreeSurface(surface->sdlsurface);
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free(surface);
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}
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BOOL RenderBackend_IsSurfaceLost(RenderBackend_Surface *surface)
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{
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(void)surface;
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return FALSE;
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}
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void RenderBackend_RestoreSurface(RenderBackend_Surface *surface)
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{
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(void)surface;
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}
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unsigned char* RenderBackend_LockSurface(RenderBackend_Surface *surface, unsigned int *pitch, unsigned int width, unsigned int height)
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{
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(void)width;
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(void)height;
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if (surface == NULL)
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return NULL;
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*pitch = surface->sdlsurface->pitch;
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return (unsigned char*)surface->sdlsurface->pixels;
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}
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void RenderBackend_UnlockSurface(RenderBackend_Surface *surface, unsigned int width, unsigned int height)
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{
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(void)surface;
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(void)width;
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(void)height;
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}
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void RenderBackend_Blit(RenderBackend_Surface *source_surface, const RECT *rect, RenderBackend_Surface *destination_surface, long x, long y, BOOL colour_key)
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{
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if (source_surface == NULL || destination_surface == NULL)
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return;
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SDL_Rect source_rect;
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RectToSDLRect(rect, &source_rect);
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SDL_Rect destination_rect;
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destination_rect.x = x;
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destination_rect.y = y;
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destination_rect.w = source_rect.w;
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destination_rect.h = source_rect.h;
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// Assumes the colour key will always be #000000 (black)
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if (SDL_SetColorKey(source_surface->sdlsurface, colour_key ? SDL_TRUE : SDL_FALSE, SDL_MapRGB(source_surface->sdlsurface->format, 0, 0, 0)) < 0)
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Backend_PrintError("Couldn't set color key of surface: %s", SDL_GetError());
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if (SDL_BlitSurface(source_surface->sdlsurface, &source_rect, destination_surface->sdlsurface, &destination_rect) < 0)
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Backend_PrintError("Couldn't blit surface: %s", SDL_GetError());
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}
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void RenderBackend_ColourFill(RenderBackend_Surface *surface, const RECT *rect, unsigned char red, unsigned char green, unsigned char blue)
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{
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if (surface == NULL)
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return;
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SDL_Rect destination_rect;
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RectToSDLRect(rect, &destination_rect);
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if (SDL_FillRect(surface->sdlsurface, &destination_rect, SDL_MapRGB(surface->sdlsurface->format, red, green, blue)) < 0)
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Backend_PrintError("Couldn't fill rectangle with color: %s", SDL_GetError());
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}
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RenderBackend_Glyph* RenderBackend_LoadGlyph(const unsigned char *pixels, unsigned int width, unsigned int height, int pitch)
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{
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RenderBackend_Glyph *glyph = (RenderBackend_Glyph*)malloc(sizeof(RenderBackend_Glyph));
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if (glyph == NULL)
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return NULL;
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glyph->sdlsurface = SDL_CreateRGBSurfaceWithFormat(0, width, height, 0, SDL_PIXELFORMAT_RGBA32);
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if (glyph->sdlsurface == NULL)
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{
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Backend_PrintError("Couldn't create RBG surface: %s", SDL_GetError());
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free(glyph);
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return NULL;
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}
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for (unsigned int y = 0; y < height; ++y)
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{
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const unsigned char *source_pointer = pixels + y * pitch;
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unsigned char *destination_pointer = (unsigned char*)glyph->sdlsurface->pixels + y * glyph->sdlsurface->pitch;
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for (unsigned int x = 0; x < width; ++x)
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{
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*destination_pointer++ = 0xFF;
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*destination_pointer++ = 0xFF;
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*destination_pointer++ = 0xFF;
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*destination_pointer++ = *source_pointer++;
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}
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}
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return glyph;
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}
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void RenderBackend_UnloadGlyph(RenderBackend_Glyph *glyph)
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{
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if (glyph == NULL)
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return;
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SDL_FreeSurface(glyph->sdlsurface);
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free(glyph);
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}
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void RenderBackend_PrepareToDrawGlyphs(RenderBackend_Surface *destination_surface, const unsigned char *colour_channels)
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{
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if (destination_surface == NULL)
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return;
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glyph_destination_sdlsurface = destination_surface->sdlsurface;
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memcpy(glyph_colour_channels, colour_channels, sizeof(glyph_colour_channels));
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}
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void RenderBackend_DrawGlyph(RenderBackend_Glyph *glyph, long x, long y)
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{
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if (glyph == NULL)
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return;
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SDL_Rect rect;
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rect.x = x;
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rect.y = y;
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rect.w = glyph->sdlsurface->w;
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rect.h = glyph->sdlsurface->h;
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if (SDL_SetSurfaceColorMod(glyph->sdlsurface, glyph_colour_channels[0], glyph_colour_channels[1], glyph_colour_channels[2]) < 0)
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Backend_PrintError("Couldn't set color value: %s", SDL_GetError());
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if (SDL_BlitSurface(glyph->sdlsurface, NULL, glyph_destination_sdlsurface, &rect) < 0)
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Backend_PrintError("Couldn't blit glyph indivual surface to final glyph surface: %s", SDL_GetError());
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}
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void RenderBackend_FlushGlyphs(void)
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{
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}
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void RenderBackend_HandleRenderTargetLoss(void)
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{
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// No problem for us
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}
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void RenderBackend_HandleWindowResize(unsigned int width, unsigned int height)
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{
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(void)width;
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(void)height;
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// https://wiki.libsdl.org/SDL_GetWindowSurface
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// We need to fetch a new surface pointer
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window_sdlsurface = SDL_GetWindowSurface(window);
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if (window_sdlsurface == NULL)
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Backend_PrintError("Couldn't get SDL surface for window after resize: %s", SDL_GetError());
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}
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