462 lines
14 KiB
C++
462 lines
14 KiB
C++
// Released under the MIT licence.
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// See LICENCE.txt for details.
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#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 "../Shared/SDL.h"
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#define MAX(a,b) ((a) > (b) ? (a) : (b))
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typedef struct RenderBackend_Surface
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{
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SDL_Texture *texture;
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size_t width;
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size_t height;
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bool render_target;
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bool lost;
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struct RenderBackend_Surface *next;
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struct RenderBackend_Surface *prev;
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} RenderBackend_Surface;
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typedef struct RenderBackend_GlyphAtlas
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{
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SDL_Texture *texture;
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} RenderBackend_GlyphAtlas;
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SDL_Window *window;
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static SDL_Renderer *renderer;
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static RenderBackend_Surface framebuffer;
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static RenderBackend_Surface upscaled_framebuffer;
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static SDL_Rect window_rect;
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static RenderBackend_Surface *surface_list_head;
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static RenderBackend_GlyphAtlas *glyph_atlas;
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static void RectToSDLRect(const RenderBackend_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, size_t screen_width, size_t screen_height, bool fullscreen)
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{
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Backend_PrintInfo("Available SDL render drivers:");
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for (int i = 0; i < SDL_GetNumRenderDrivers(); ++i)
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{
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SDL_RendererInfo info;
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if (SDL_GetRenderDriverInfo(i, &info) < 0)
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Backend_PrintError("Couldn't get render driver information: %s", SDL_GetError());
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else
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Backend_PrintInfo("%s", info.name);
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}
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window = SDL_CreateWindow(window_title, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, screen_width, screen_height, SDL_WINDOW_RESIZABLE);
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if (window != NULL)
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{
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if (fullscreen)
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if (SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN) < 0)
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Backend_PrintError("Couldn't set window to fullscreen: %s", SDL_GetError());
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#if SDL_VERSION_ATLEAST(2,0,10)
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SDL_SetHint(SDL_HINT_RENDER_BATCHING, "1"); // We never interfere with the renderer, so don't let SDL implicitly disable batching
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#endif
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renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE);
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if (renderer != NULL)
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{
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SDL_RendererInfo info;
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if (SDL_GetRendererInfo(renderer, &info) < 0)
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Backend_PrintError("Couldn't get selected render driver information: %s", SDL_GetError());
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else
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Backend_PrintInfo("Selected SDL render driver: %s", info.name);
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framebuffer.texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_TARGET, screen_width, screen_height);
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if (framebuffer.texture != NULL)
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{
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SDL_SetTextureBlendMode(framebuffer.texture, SDL_BLENDMODE_NONE);
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framebuffer.width = screen_width;
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framebuffer.height = screen_height;
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RenderBackend_HandleWindowResize(screen_width, screen_height);
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Backend_PostWindowCreation();
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return &framebuffer;
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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 framebuffer: ") + SDL_GetError();
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Backend_ShowMessageBox("Fatal error (SDLTexture rendering backend)", error_message.c_str());
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}
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SDL_DestroyRenderer(renderer);
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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 renderer: ") + SDL_GetError();
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Backend_ShowMessageBox("Fatal error (SDLTexture 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 (SDLTexture 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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if (upscaled_framebuffer.texture != NULL)
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SDL_DestroyTexture(upscaled_framebuffer.texture);
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SDL_DestroyTexture(framebuffer.texture);
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SDL_DestroyRenderer(renderer);
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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 (upscaled_framebuffer.texture != NULL)
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{
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if (SDL_SetRenderTarget(renderer, upscaled_framebuffer.texture) < 0)
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Backend_PrintError("Couldn't set upscaled framebuffer as the current rendering target: %s", SDL_GetError());
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if (SDL_RenderCopy(renderer, framebuffer.texture, NULL, NULL) < 0)
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Backend_PrintError("Failed to copy framebuffer texture to upscaled framebuffer: %s", SDL_GetError());
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}
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if (SDL_SetRenderTarget(renderer, NULL) < 0)
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Backend_PrintError("Couldn't set default render target as the current rendering target: %s", SDL_GetError());
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if (SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF) < 0)
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Backend_PrintError("Couldn't set color for drawing operations: %s", SDL_GetError());
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SDL_RenderClear(renderer);
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if (SDL_RenderCopy(renderer, upscaled_framebuffer.texture != NULL ? upscaled_framebuffer.texture : framebuffer.texture, NULL, &window_rect) < 0)
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Backend_PrintError("Failed to copy upscaled framebuffer texture to default render target: %s", SDL_GetError());
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SDL_RenderPresent(renderer);
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}
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RenderBackend_Surface* RenderBackend_CreateSurface(size_t width, size_t height, bool render_target)
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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->texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, render_target ? SDL_TEXTUREACCESS_TARGET : SDL_TEXTUREACCESS_STATIC, width, height);
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if (surface->texture == 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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surface->width = width;
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surface->height = height;
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surface->render_target = render_target;
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surface->lost = false;
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// Add to linked-list
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surface->prev = NULL;
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surface->next = surface_list_head;
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surface_list_head = surface;
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if (surface->next != NULL)
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surface->next->prev = surface;
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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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// Remove from linked list
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if (surface->next != NULL)
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surface->next->prev = surface->prev;
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if (surface->prev != NULL)
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surface->prev->next = surface->next;
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if (surface->prev == NULL)
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surface_list_head = surface->next;
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SDL_DestroyTexture(surface->texture);
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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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return surface->lost;
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}
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void RenderBackend_RestoreSurface(RenderBackend_Surface *surface)
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{
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surface->lost = false;
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}
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void RenderBackend_UploadSurface(RenderBackend_Surface *surface, const unsigned char *pixels, size_t width, size_t height)
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{
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unsigned char *buffer = (unsigned char*)malloc(width * height * 4);
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if (buffer == NULL)
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{
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Backend_PrintError("Couldn't allocate memory for surface buffer");
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return;
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}
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const unsigned char *src_pixel = pixels;
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unsigned char *buffer_pointer = buffer;
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// Convert the colour-keyed pixels to RGBA32
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for (size_t y = 0; y < height; ++y)
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{
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for (size_t x = 0; x < width; ++x)
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{
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*buffer_pointer++ = src_pixel[0];
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*buffer_pointer++ = src_pixel[1];
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*buffer_pointer++ = src_pixel[2];
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if (src_pixel[0] == 0 && src_pixel[1] == 0 && src_pixel[2] == 0) // Assumes the colour key will always be #000000 (black)
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*buffer_pointer++ = 0;
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else
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*buffer_pointer++ = 0xFF;
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src_pixel += 3;
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}
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}
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SDL_Rect rect = {0, 0, (int)width, (int)height};
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if (SDL_UpdateTexture(surface->texture, &rect, buffer, width * 4) < 0)
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Backend_PrintError("Couldn't update part of texture: %s", SDL_GetError());
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free(buffer);
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}
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void RenderBackend_Blit(RenderBackend_Surface *source_surface, const RenderBackend_Rect *rect, RenderBackend_Surface *destination_surface, long x, long y, bool colour_key)
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{
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SDL_Rect source_rect;
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RectToSDLRect(rect, &source_rect);
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SDL_Rect destination_rect = {(int)x, (int)y, source_rect.w, source_rect.h};
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// Blit the texture
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if (SDL_SetTextureBlendMode(source_surface->texture, colour_key ? SDL_BLENDMODE_BLEND : SDL_BLENDMODE_NONE) < 0)
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Backend_PrintError("Couldn't set texture blend mode: %s", SDL_GetError());
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if (SDL_SetRenderTarget(renderer, destination_surface->texture) < 0)
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Backend_PrintError("Couldn't set current rendering target: %s", SDL_GetError());
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if (SDL_RenderCopy(renderer, source_surface->texture, &source_rect, &destination_rect) < 0)
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Backend_PrintError("Couldn't copy part of texture to rendering target: %s", SDL_GetError());
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}
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void RenderBackend_ColourFill(RenderBackend_Surface *surface, const RenderBackend_Rect *rect, unsigned char red, unsigned char green, unsigned char blue)
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{
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SDL_Rect sdl_rect;
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RectToSDLRect(rect, &sdl_rect);
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Uint8 alpha = SDL_ALPHA_OPAQUE;
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// Check colour-key
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if (red == 0 && green == 0 && blue == 0)
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alpha = 0;
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if (SDL_SetRenderDrawColor(renderer, red, green, blue, alpha) < 0)
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Backend_PrintError("Couldn't set color for drawing operations: %s", SDL_GetError());
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// Draw colour
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if (SDL_SetRenderTarget(renderer, surface->texture) < 0)
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Backend_PrintError("Couldn't set texture current rendering target: %s", SDL_GetError());
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if (SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE) < 0)
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Backend_PrintError("Couldn't disable blending for drawing operations: %s", SDL_GetError());
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if (SDL_RenderFillRect(renderer, &sdl_rect) < 0)
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Backend_PrintError("Couldn't fill rectangle on current rendering target: %s", SDL_GetError());
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if (SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND) < 0)
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Backend_PrintError("Couldn't enable alpha blending for drawing operations: %s", SDL_GetError());
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}
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RenderBackend_GlyphAtlas* RenderBackend_CreateGlyphAtlas(size_t width, size_t height)
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{
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RenderBackend_GlyphAtlas *atlas = (RenderBackend_GlyphAtlas*)malloc(sizeof(RenderBackend_GlyphAtlas));
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if (atlas != NULL)
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{
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atlas->texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STATIC, width, height);
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if (atlas->texture != NULL)
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{
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return atlas;
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}
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else
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{
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Backend_PrintError("Couldn't create texture for renderer: %s", SDL_GetError());
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}
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free(atlas);
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}
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return NULL;
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}
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void RenderBackend_DestroyGlyphAtlas(RenderBackend_GlyphAtlas *atlas)
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{
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SDL_DestroyTexture(atlas->texture);
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free(atlas);
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}
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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)
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{
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unsigned char *buffer = (unsigned char*)malloc(width * height * 4);
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if (buffer != NULL)
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{
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unsigned char *destination_pointer = buffer;
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for (size_t iy = 0; iy < height; ++iy)
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{
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const unsigned char *source_pointer = &pixels[iy * pitch];
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for (size_t ix = 0; ix < width; ++ix)
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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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SDL_Rect rect;
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rect.x = x;
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rect.y = y;
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rect.w = width;
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rect.h = height;
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if (SDL_UpdateTexture(atlas->texture, &rect, buffer, width * 4) < 0)
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Backend_PrintError("Couldn't update texture: %s", SDL_GetError());
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free(buffer);
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}
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}
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void RenderBackend_PrepareToDrawGlyphs(RenderBackend_GlyphAtlas *atlas, RenderBackend_Surface *destination_surface, unsigned char red, unsigned char green, unsigned char blue)
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{
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glyph_atlas = atlas;
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if (SDL_SetRenderTarget(renderer, destination_surface->texture) < 0)
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Backend_PrintError("Couldn't set texture as current rendering target: %s", SDL_GetError());
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// The SDL_Texture side of things uses alpha, not a colour-key, so the bug where the font is blended
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// with the colour key doesn't occur.
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if (SDL_SetTextureColorMod(atlas->texture, red, green, blue) < 0)
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Backend_PrintError("Couldn't set additional color value: %s", SDL_GetError());
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if (SDL_SetTextureBlendMode(atlas->texture, SDL_BLENDMODE_BLEND) < 0)
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Backend_PrintError("Couldn't set texture blend mode: %s", SDL_GetError());
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}
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void RenderBackend_DrawGlyph(long x, long y, size_t glyph_x, size_t glyph_y, size_t glyph_width, size_t glyph_height)
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{
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SDL_Rect source_rect;
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source_rect.x = glyph_x;
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source_rect.y = glyph_y;
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source_rect.w = glyph_width;
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source_rect.h = glyph_height;
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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 = glyph_width;
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destination_rect.h = glyph_height;
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if (SDL_RenderCopy(renderer, glyph_atlas->texture, &source_rect, &destination_rect) < 0)
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Backend_PrintError("Couldn't copy glyph texture portion to renderer: %s", SDL_GetError());
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}
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void RenderBackend_HandleRenderTargetLoss(void)
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{
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for (RenderBackend_Surface *surface = surface_list_head; surface != NULL; surface = surface->next)
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if (surface->render_target)
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surface->lost = true;
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}
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void RenderBackend_HandleWindowResize(size_t width, size_t height)
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{
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size_t upscale_factor = MAX(1, MIN((width + framebuffer.width / 2) / framebuffer.width, (height + framebuffer.height / 2) / framebuffer.height));
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upscaled_framebuffer.width = framebuffer.width * upscale_factor;
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upscaled_framebuffer.height = framebuffer.height * upscale_factor;
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if (upscaled_framebuffer.texture != NULL)
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{
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SDL_DestroyTexture(upscaled_framebuffer.texture);
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upscaled_framebuffer.texture = NULL;
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}
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// Create rect that forces 4:3 no matter what size the window is
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if (width * upscaled_framebuffer.height >= upscaled_framebuffer.width * height) // Fancy way to do `if (width / height >= upscaled_framebuffer.width / upscaled_framebuffer.height)` without floats
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{
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window_rect.w = (height * upscaled_framebuffer.width) / upscaled_framebuffer.height;
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window_rect.h = height;
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}
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else
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{
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window_rect.w = width;
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window_rect.h = (width * upscaled_framebuffer.height) / upscaled_framebuffer.width;
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}
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window_rect.x = (width - window_rect.w) / 2;
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window_rect.y = (height - window_rect.h) / 2;
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if (window_rect.w % framebuffer.width != 0 || window_rect.h % framebuffer.height != 0)
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{
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SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
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upscaled_framebuffer.texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_TARGET, upscaled_framebuffer.width, upscaled_framebuffer.height);
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SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "nearest");
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if (upscaled_framebuffer.texture == NULL)
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Backend_PrintError("Couldn't regenerate upscaled framebuffer");
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SDL_SetTextureBlendMode(upscaled_framebuffer.texture, SDL_BLENDMODE_NONE);
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}
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}
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