Zero streaming textures at the driver level

src/render/opengl/SDL_render_gl.c

@@ -427,7 +427,7 @@ GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
             /* Need to add size for the U and V planes */
             size += (2 * (texture->h * data->pitch) / 4);
         }
-        data->pixels = SDL_malloc(size);
+        data->pixels = SDL_calloc(1, size);
         if (!data->pixels) {
             SDL_OutOfMemory();
             SDL_free(data);

src/render/opengles/SDL_render_gles.c

@@ -322,7 +322,7 @@ GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
 
     if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
         data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);
-        data->pixels = SDL_malloc(texture->h * data->pitch);
+        data->pixels = SDL_calloc(1, texture->h * data->pitch);
         if (!data->pixels) {
             SDL_OutOfMemory();
             SDL_free(data);

src/render/opengles2/SDL_render_gles2.c

@@ -272,7 +272,7 @@ GLES2_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture)
     if (texture->access == SDL_TEXTUREACCESS_STREAMING)
     {
         tdata->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);
-        tdata->pixel_data = SDL_malloc(tdata->pitch * texture->h);
+        tdata->pixel_data = SDL_calloc(1, tdata->pitch * texture->h);
         if (!tdata->pixel_data)
         {
             SDL_OutOfMemory();