We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

Test INDEX8 alpha program

testsdl.c (text/x-csrc), 1.79 KB, created by Jason Borden on 2020-03-16 04:01:26 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Jason Borden

Created: 2020-03-16 04:01:26 UTC

Size: 1.79 KB

patch

obsolete

>#include "SDL.h"
>
>int main()
>{
>    SDL_Window *win;
>    SDL_Renderer *rend;
>    SDL_Surface *surface1, *surface2;
>    SDL_Texture *texture1, *texture2;
>    SDL_Color pal1[256], pal2[256];
>
>    // Create all white palette
>    memset(pal1, 0xff, sizeof(SDL_Color) * 256);
>    memset(pal2, 0xff, sizeof(SDL_Color) * 256);
>    pal1[0].a = 0; // pal1 uses 0 for alpha
>    pal2[0].a = 1; // pal2 uses 1 for alpha
>
>    SDL_Init(SDL_INIT_VIDEO);
>    win = SDL_CreateWindow("Alpha test", SDL_WINDOWPOS_CENTERED, 
>            SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
>    rend = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
>    surface1 = SDL_CreateRGBSurfaceWithFormat(0, 640, 480, 8, SDL_PIXELFORMAT_INDEX8);
>    surface2 = SDL_CreateRGBSurfaceWithFormat(0, 640, 480, 8, SDL_PIXELFORMAT_INDEX8);
>    SDL_SetPaletteColors(surface1->format->palette, pal1, 0, 256);
>    SDL_SetPaletteColors(surface2->format->palette, pal2, 0, 256);
>    SDL_LockSurface(surface1);
>    SDL_LockSurface(surface2);
>    memset(surface1->pixels, 0, 640 * 480);
>    memset(surface2->pixels, 0, 640 * 480);
>    SDL_UnlockSurface(surface1);
>    SDL_UnlockSurface(surface2);
>    texture1 = SDL_CreateTextureFromSurface(rend, surface1);
>    texture2 = SDL_CreateTextureFromSurface(rend, surface2);
>    SDL_SetTextureBlendMode(texture1, SDL_BLENDMODE_BLEND);
>    SDL_SetTextureBlendMode(texture2, SDL_BLENDMODE_BLEND);
>
>    // Solid green background
>    SDL_SetRenderDrawColor(rend, 0, 255, 0, 255);
>
>    // Render first texture 
>    SDL_RenderClear(rend);
>    SDL_RenderCopy(rend, texture1, NULL, NULL);
>    SDL_RenderPresent(rend);
>    SDL_Delay(5000);
>
>    // Render Second texture 
>    SDL_RenderClear(rend);
>    SDL_RenderCopy(rend, texture2, NULL, NULL);
>    SDL_RenderPresent(rend);
>    SDL_Delay(5000);
>    
>    SDL_Quit();
>
>    return 0;
>}

Actions: View

Attachments on bug 5037: 4259

We are currently migrating Bugzilla to GitHub issues.Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.