ref: b821d86c911e230575d3d3d9e45f1690de5636a1
dir: /src/Backends/Rendering/SDLSurface.cpp/
// Released under the MIT licence.
// See LICENCE.txt for details.
#include "../Rendering.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include "SDL.h"
#include "../Misc.h"
#include "../Shared/SDL.h"
typedef struct RenderBackend_Surface
{
SDL_Surface *sdlsurface;
} RenderBackend_Surface;
typedef struct RenderBackend_GlyphAtlas
{
SDL_Surface *sdlsurface;
} RenderBackend_GlyphAtlas;
SDL_Window *window;
static SDL_Surface *window_sdlsurface;
static RenderBackend_Surface framebuffer;
static RenderBackend_GlyphAtlas *glyph_atlas;
static RenderBackend_Surface *glyph_destination_surface;
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, size_t screen_width, size_t 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(size_t width, size_t 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)
{
SDL_FreeSurface(surface->sdlsurface);
free(surface);
}
bool RenderBackend_IsSurfaceLost(RenderBackend_Surface *surface)
{
(void)surface;
return false;
}
void RenderBackend_RestoreSurface(RenderBackend_Surface *surface)
{
(void)surface;
}
void RenderBackend_UploadSurface(RenderBackend_Surface *surface, const unsigned char *pixels, size_t width, size_t height)
{
if (SDL_LockSurface(surface->sdlsurface) == 0)
{
for (size_t y = 0; y < height; ++y)
memcpy(&((unsigned char*)surface->sdlsurface->pixels)[y * surface->sdlsurface->pitch], &pixels[y * width * 3], width * 3);
SDL_UnlockSurface(surface->sdlsurface);
}
}
void RenderBackend_Blit(RenderBackend_Surface *source_surface, const RenderBackend_Rect *rect, RenderBackend_Surface *destination_surface, long x, long y, bool colour_key)
{
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)
{
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_GlyphAtlas* RenderBackend_CreateGlyphAtlas(size_t width, size_t height)
{
RenderBackend_GlyphAtlas *atlas = (RenderBackend_GlyphAtlas*)malloc(sizeof(RenderBackend_GlyphAtlas));
if (atlas != NULL)
{
atlas->sdlsurface = SDL_CreateRGBSurfaceWithFormat(0, width, height, 0, SDL_PIXELFORMAT_RGBA32);
if (atlas->sdlsurface != NULL)
{
return atlas;
}
else
{
Backend_PrintError("Couldn't create RBG surface: %s", SDL_GetError());
}
free(atlas);
}
return NULL;
}
void RenderBackend_DestroyGlyphAtlas(RenderBackend_GlyphAtlas *atlas)
{
SDL_FreeSurface(atlas->sdlsurface);
free(atlas);
}
void RenderBackend_UploadGlyph(RenderBackend_GlyphAtlas *atlas, size_t x, size_t y, const unsigned char *pixels, size_t width, size_t height, size_t pitch)
{
SDL_LockSurface(atlas->sdlsurface);
for (size_t iy = 0; iy < height; ++iy)
{
const unsigned char *source_pointer = &pixels[iy * pitch];
unsigned char *destination_pointer = &((unsigned char*)atlas->sdlsurface->pixels)[(y + iy) * atlas->sdlsurface->pitch + x * 4];
for (size_t ix = 0; ix < width; ++ix)
{
*destination_pointer++ = 0xFF;
*destination_pointer++ = 0xFF;
*destination_pointer++ = 0xFF;
*destination_pointer++ = *source_pointer++;
}
}
SDL_UnlockSurface(atlas->sdlsurface);
}
void RenderBackend_PrepareToDrawGlyphs(RenderBackend_GlyphAtlas *atlas, RenderBackend_Surface *destination_surface, unsigned char red, unsigned char green, unsigned char blue)
{
glyph_atlas = atlas;
glyph_destination_surface = destination_surface;
if (SDL_SetSurfaceColorMod(atlas->sdlsurface, red, green, blue) < 0)
Backend_PrintError("Couldn't set color value: %s", SDL_GetError());
}
void RenderBackend_DrawGlyph(long x, long y, size_t glyph_x, size_t glyph_y, size_t glyph_width, size_t glyph_height)
{
SDL_Rect source_rect;
source_rect.x = glyph_x;
source_rect.y = glyph_y;
source_rect.w = glyph_width;
source_rect.h = glyph_height;
SDL_Rect destination_rect;
destination_rect.x = x;
destination_rect.y = y;
destination_rect.w = glyph_width;
destination_rect.h = glyph_height;
if (SDL_BlitSurface(glyph_atlas->sdlsurface, &source_rect, glyph_destination_surface->sdlsurface, &destination_rect) < 0)
Backend_PrintError("Couldn't blit glyph indivual surface to final glyph surface: %s", SDL_GetError());
}
void RenderBackend_HandleRenderTargetLoss(void)
{
// No problem for us
}
void RenderBackend_HandleWindowResize(size_t width, size_t 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());
}