ref: 187847fbcc663b96ee94ec400bd067d64e8b5433
dir: /src/Backends/Rendering/SDLSurface.cpp/
#include "../Rendering.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include "SDL_error.h"
#include "SDL_pixels.h"
#include "SDL_rect.h"
#include "SDL_stdinc.h"
#include "SDL_surface.h"
#include "SDL_video.h"
#include "../Misc.h"
#include "../Shared/SDL2.h"
typedef struct RenderBackend_Surface
{
SDL_Surface *sdlsurface;
} RenderBackend_Surface;
typedef struct RenderBackend_Glyph
{
SDL_Surface *sdlsurface;
} RenderBackend_Glyph;
SDL_Window *window;
static SDL_Surface *window_sdlsurface;
static RenderBackend_Surface framebuffer;
static unsigned char glyph_colour_channels[3];
static SDL_Surface *glyph_destination_sdlsurface;
static void RectToSDLRect(const RenderBackend_Rect *rect, SDL_Rect *sdl_rect)
{
sdl_rect->x = (int)rect->left;
sdl_rect->y = (int)rect->top;
sdl_rect->w = (int)(rect->right - rect->left);
sdl_rect->h = (int)(rect->bottom - rect->top);
if (sdl_rect->w < 0)
sdl_rect->w = 0;
if (sdl_rect->h < 0)
sdl_rect->h = 0;
}
RenderBackend_Surface* RenderBackend_Init(const char *window_title, int screen_width, int screen_height, bool fullscreen)
{
window = SDL_CreateWindow(window_title, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, screen_width, screen_height, 0);
if (window != NULL)
{
if (fullscreen)
if (SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN) < 0)
Backend_PrintError("Could not set window to fullscreen: %s", SDL_GetError());
window_sdlsurface = SDL_GetWindowSurface(window);
if (window_sdlsurface != NULL)
{
framebuffer.sdlsurface = SDL_CreateRGBSurfaceWithFormat(0, window_sdlsurface->w, window_sdlsurface->h, 0, SDL_PIXELFORMAT_RGB24);
if (framebuffer.sdlsurface != NULL)
{
Backend_PostWindowCreation();
return &framebuffer;
}
std::string error_message = std::string("Could not create framebuffer surface: ") + SDL_GetError();
Backend_ShowMessageBox("Fatal error (SDLSurface rendering backend)", error_message.c_str());
}
else
{
std::string error_message = std::string("Could not get SDL surface of the window: ") + SDL_GetError();
Backend_ShowMessageBox("Fatal error (SDLSurface rendering backend)", error_message.c_str());
}
SDL_DestroyWindow(window);
}
else
{
std::string error_message = std::string("Could not create window: ") + SDL_GetError();
Backend_ShowMessageBox("Fatal error (SDLSurface rendering backend)", error_message.c_str());
}
return NULL;
}
void RenderBackend_Deinit(void)
{
SDL_FreeSurface(framebuffer.sdlsurface);
SDL_DestroyWindow(window);
}
void RenderBackend_DrawScreen(void)
{
if (SDL_BlitSurface(framebuffer.sdlsurface, NULL, window_sdlsurface, NULL) < 0)
Backend_PrintError("Couldn't blit framebuffer surface to window surface: %s", SDL_GetError());
if (SDL_UpdateWindowSurface(window) < 0)
Backend_PrintError("Couldn't put window surface on screen: %s", SDL_GetError());
}
RenderBackend_Surface* RenderBackend_CreateSurface(unsigned int width, unsigned int height, bool render_target)
{
(void)render_target;
RenderBackend_Surface *surface = (RenderBackend_Surface*)malloc(sizeof(RenderBackend_Surface));
if (surface == NULL)
return NULL;
surface->sdlsurface = SDL_CreateRGBSurfaceWithFormat(0, width, height, 0, SDL_PIXELFORMAT_RGB24);
if (surface->sdlsurface == NULL)
{
free(surface);
return NULL;
}
return surface;
}
void RenderBackend_FreeSurface(RenderBackend_Surface *surface)
{
if (surface == NULL)
return;
SDL_FreeSurface(surface->sdlsurface);
free(surface);
}
bool RenderBackend_IsSurfaceLost(RenderBackend_Surface *surface)
{
(void)surface;
return false;
}
void RenderBackend_RestoreSurface(RenderBackend_Surface *surface)
{
(void)surface;
}
unsigned char* RenderBackend_LockSurface(RenderBackend_Surface *surface, unsigned int *pitch, unsigned int width, unsigned int height)
{
(void)width;
(void)height;
if (surface == NULL)
return NULL;
*pitch = surface->sdlsurface->pitch;
return (unsigned char*)surface->sdlsurface->pixels;
}
void RenderBackend_UnlockSurface(RenderBackend_Surface *surface, unsigned int width, unsigned int height)
{
(void)surface;
(void)width;
(void)height;
}
void RenderBackend_Blit(RenderBackend_Surface *source_surface, const RenderBackend_Rect *rect, RenderBackend_Surface *destination_surface, long x, long y, bool colour_key)
{
if (source_surface == NULL || destination_surface == NULL)
return;
SDL_Rect source_rect;
RectToSDLRect(rect, &source_rect);
SDL_Rect destination_rect;
destination_rect.x = x;
destination_rect.y = y;
destination_rect.w = source_rect.w;
destination_rect.h = source_rect.h;
// Assumes the colour key will always be #000000 (black)
if (SDL_SetColorKey(source_surface->sdlsurface, colour_key ? SDL_TRUE : SDL_FALSE, SDL_MapRGB(source_surface->sdlsurface->format, 0, 0, 0)) < 0)
Backend_PrintError("Couldn't set color key of surface: %s", SDL_GetError());
if (SDL_BlitSurface(source_surface->sdlsurface, &source_rect, destination_surface->sdlsurface, &destination_rect) < 0)
Backend_PrintError("Couldn't blit surface: %s", SDL_GetError());
}
void RenderBackend_ColourFill(RenderBackend_Surface *surface, const RenderBackend_Rect *rect, unsigned char red, unsigned char green, unsigned char blue)
{
if (surface == NULL)
return;
SDL_Rect destination_rect;
RectToSDLRect(rect, &destination_rect);
if (SDL_FillRect(surface->sdlsurface, &destination_rect, SDL_MapRGB(surface->sdlsurface->format, red, green, blue)) < 0)
Backend_PrintError("Couldn't fill rectangle with color: %s", SDL_GetError());
}
RenderBackend_Glyph* RenderBackend_LoadGlyph(const unsigned char *pixels, unsigned int width, unsigned int height, int pitch)
{
RenderBackend_Glyph *glyph = (RenderBackend_Glyph*)malloc(sizeof(RenderBackend_Glyph));
if (glyph == NULL)
return NULL;
glyph->sdlsurface = SDL_CreateRGBSurfaceWithFormat(0, width, height, 0, SDL_PIXELFORMAT_RGBA32);
if (glyph->sdlsurface == NULL)
{
Backend_PrintError("Couldn't create RBG surface: %s", SDL_GetError());
free(glyph);
return NULL;
}
for (unsigned int y = 0; y < height; ++y)
{
const unsigned char *source_pointer = pixels + y * pitch;
unsigned char *destination_pointer = (unsigned char*)glyph->sdlsurface->pixels + y * glyph->sdlsurface->pitch;
for (unsigned int x = 0; x < width; ++x)
{
*destination_pointer++ = 0xFF;
*destination_pointer++ = 0xFF;
*destination_pointer++ = 0xFF;
*destination_pointer++ = *source_pointer++;
}
}
return glyph;
}
void RenderBackend_UnloadGlyph(RenderBackend_Glyph *glyph)
{
if (glyph == NULL)
return;
SDL_FreeSurface(glyph->sdlsurface);
free(glyph);
}
void RenderBackend_PrepareToDrawGlyphs(RenderBackend_Surface *destination_surface, const unsigned char *colour_channels)
{
if (destination_surface == NULL)
return;
glyph_destination_sdlsurface = destination_surface->sdlsurface;
memcpy(glyph_colour_channels, colour_channels, sizeof(glyph_colour_channels));
}
void RenderBackend_DrawGlyph(RenderBackend_Glyph *glyph, long x, long y)
{
if (glyph == NULL)
return;
SDL_Rect rect;
rect.x = x;
rect.y = y;
rect.w = glyph->sdlsurface->w;
rect.h = glyph->sdlsurface->h;
if (SDL_SetSurfaceColorMod(glyph->sdlsurface, glyph_colour_channels[0], glyph_colour_channels[1], glyph_colour_channels[2]) < 0)
Backend_PrintError("Couldn't set color value: %s", SDL_GetError());
if (SDL_BlitSurface(glyph->sdlsurface, NULL, glyph_destination_sdlsurface, &rect) < 0)
Backend_PrintError("Couldn't blit glyph indivual surface to final glyph surface: %s", SDL_GetError());
}
void RenderBackend_FlushGlyphs(void)
{
}
void RenderBackend_HandleRenderTargetLoss(void)
{
// No problem for us
}
void RenderBackend_HandleWindowResize(unsigned int width, unsigned int height)
{
(void)width;
(void)height;
// https://wiki.libsdl.org/SDL_GetWindowSurface
// We need to fetch a new surface pointer
window_sdlsurface = SDL_GetWindowSurface(window);
if (window_sdlsurface == NULL)
Backend_PrintError("Couldn't get SDL surface for window after resize: %s", SDL_GetError());
}