125 lines
4.6 KiB
C
125 lines
4.6 KiB
C
#include <SDL2/SDL.h>
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#include <SDL2/SDL_image.h>
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#include <SDL2/SDL_timer.h>
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#include <SDL2/SDL_ttf.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "spacewarGraphics.h"
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SpacewarTitlescreen prepareTitleScreen(SDL_Window * window, SDL_Renderer * renderer,
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char * starfieldTexturePath, char * logoTexturePath,
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TTF_Font * font, char * text)
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{
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SpacewarTitlescreen newTitleScreen;
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// Basic state:
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newTitleScreen.xScroll = 0;
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newTitleScreen.textAlpha = 0;
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newTitleScreen.titleAlpha = 0;
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// Requirements for drawing:
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newTitleScreen.window = window;
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newTitleScreen.renderer = renderer;
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// Textures:
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newTitleScreen.titleTexture = IMG_LoadTexture(renderer, logoTexturePath);
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newTitleScreen.starfieldTexture = IMG_LoadTexture(renderer, starfieldTexturePath);
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// Text message:
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SDL_Color white = {255, 255, 255};
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SDL_Surface * fontSurface = TTF_RenderText_Blended(font, text, white);
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newTitleScreen.textTexture = SDL_CreateTextureFromSurface(renderer, fontSurface);
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SDL_FreeSurface(fontSurface);
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// Rects:
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newTitleScreen.titleRectangle = calloc(1, sizeof(SDL_Rect));
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newTitleScreen.textRectangle = calloc(1, sizeof(SDL_Rect));
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newTitleScreen.starfieldRectangle = calloc(1, sizeof(SDL_Rect));
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// Set the rects to the size of the textures:
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SDL_QueryTexture(newTitleScreen.textTexture, NULL, NULL, NULL, &newTitleScreen.textRectangle->h);
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SDL_QueryTexture(newTitleScreen.textTexture, NULL, NULL, &newTitleScreen.textRectangle->w, NULL);
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SDL_QueryTexture(newTitleScreen.titleTexture, NULL, NULL, NULL, &newTitleScreen.titleRectangle->h);
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SDL_QueryTexture(newTitleScreen.titleTexture, NULL, NULL, &newTitleScreen.titleRectangle->w, NULL);
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SDL_QueryTexture(newTitleScreen.starfieldTexture, NULL, NULL, NULL, &newTitleScreen.starfieldRectangle->h);
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SDL_QueryTexture(newTitleScreen.starfieldTexture, NULL, NULL, &newTitleScreen.starfieldRectangle->w, NULL);
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return newTitleScreen;
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}
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void drawTitleScreen(SpacewarTitlescreen * titlescreen)
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{
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// Get the current size of the window:
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int width = 0, height = 0;
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printf("%p\n", titlescreen->window);
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SDL_GetWindowSize(titlescreen->window, &width, &height);
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// Position the elements on-screen:
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titlescreen->titleRectangle->x = (width/2) - (titlescreen->titleRectangle->w / 2);
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titlescreen->titleRectangle->y = (height/2) - titlescreen->titleRectangle->h;
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titlescreen->textRectangle->x = (width/2) - (titlescreen->textRectangle->w / 2);
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titlescreen->textRectangle->y = (height/2) + (titlescreen->textRectangle->h * 2);
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// Set the renderer colour to black and clear the screen:
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SDL_SetRenderDrawColor(titlescreen->renderer, 0, 0, 0, 255);
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SDL_RenderClear(titlescreen->renderer);
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// Set the correct position to begin the starfield, and scroll it back for the next frame:
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titlescreen->starfieldRectangle->x = 0 - titlescreen->xScroll++;
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titlescreen->starfieldRectangle->y = 0;
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// Draw the starfield by tiling the starfield texture:
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while (titlescreen->starfieldRectangle->x <= (width + titlescreen->starfieldRectangle->w))
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{
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// Go down, covering a column of the screen:
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while(titlescreen->starfieldRectangle->y <= (height + titlescreen->starfieldRectangle->h))
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{
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SDL_RenderCopy(titlescreen->renderer, titlescreen->starfieldTexture, NULL,
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titlescreen->starfieldRectangle);
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titlescreen->starfieldRectangle->y += titlescreen->starfieldRectangle->h;
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}
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// Back to the top, move over one texture width:
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titlescreen->starfieldRectangle->y = 0;
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titlescreen->starfieldRectangle->x += titlescreen->starfieldRectangle->w;
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}
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// Reset the xScroll if it goes farther than a texture width away:
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if (titlescreen->xScroll == titlescreen->starfieldRectangle->w + 1)
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{
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titlescreen->xScroll = 0;
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}
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// Set the opacity of the logo so we can fade it in:
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if (titlescreen->titleAlpha < 254)
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{
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titlescreen->titleAlpha += 10;
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}
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if (titlescreen->titleAlpha >= 254)
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{
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titlescreen->titleAlpha = 254;
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}
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SDL_SetTextureAlphaMod(titlescreen->titleTexture, titlescreen->titleAlpha);
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// Set the opacity of the text so we can fade it in after we fade in the logo:
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if (titlescreen->textAlpha < 254 && titlescreen->titleAlpha == 254)
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{
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titlescreen->textAlpha += 10;
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}
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if (titlescreen->textAlpha >= 254)
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{
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titlescreen->textAlpha = 254;
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}
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SDL_SetTextureAlphaMod(titlescreen->textTexture, titlescreen->textAlpha);
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// Display the logo and text:
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SDL_RenderCopy(titlescreen->renderer, titlescreen->titleTexture, NULL, titlescreen->titleRectangle);
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SDL_RenderCopy(titlescreen->renderer, titlescreen->textTexture, NULL, titlescreen->textRectangle);
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// Display to the renderer:
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SDL_RenderPresent(titlescreen->renderer);
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}
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