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/* Sprite.cpp
Copyright (c) 2014 by Michael Zahniser
Endless Sky is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.
Endless Sky is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "Sprite.h"
#include "ImageBuffer.h"
#include "../Preferences.h"
#include "../Screen.h"
#include "../opengl.h"
#include <SDL2/SDL.h>
#include <algorithm>
using namespace std;
namespace {
void AddBuffer(ImageBuffer &buffer, uint32_t *target)
{
// Check whether this sprite is large enough to require size reduction.
if(Preferences::Has("Reduce large graphics") && buffer.Width() * buffer.Height() >= 1000000)
buffer.ShrinkToHalfSize();
// Upload the images as a single array texture.
glGenTextures(1, target);
glBindTexture(GL_TEXTURE_2D_ARRAY, *target);
// Use linear interpolation and no wrapping.
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// Upload the image data.
glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA8, // target, mipmap level, internal format,
buffer.Width(), buffer.Height(), buffer.Frames(), // width, height, depth,
0, GL_RGBA, GL_UNSIGNED_BYTE, buffer.Pixels()); // border, input format, data type, data.
// Unbind the texture.
glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
// Free the ImageBuffer memory.
buffer.Clear();
}
}
Sprite::Sprite(const string &name)
: name(name)
{
}
const string &Sprite::Name() const
{
return name;
}
// Add the given frames, optionally uploading them. The given buffer will be cleared afterwards.
void Sprite::AddFrames(ImageBuffer &buffer, bool is2x)
{
// If this is the 1x image, its dimensions determine the sprite's size.
if(!is2x)
{
width = buffer.Width();
height = buffer.Height();
frames = buffer.Frames();
}
// Only non-empty buffers need to be added to the sprite.
if(buffer.Pixels())
AddBuffer(buffer, &texture[is2x]);
}
// Upload the given frames. The given buffer will be cleared afterwards.
void Sprite::AddSwizzleMaskFrames(ImageBuffer &buffer, bool is2x)
{
// Do nothing if the buffer is empty.
if(!buffer.Pixels())
return;
AddBuffer(buffer, &swizzleMask[is2x]);
}
// Free up all textures loaded for this sprite.
void Sprite::Unload()
{
if(texture[0] || texture[1])
{
glDeleteTextures(2, texture);
texture[0] = texture[1] = 0;
}
if(swizzleMask[0] || swizzleMask[1])
{
glDeleteTextures(2, swizzleMask);
swizzleMask[0] = swizzleMask[1] = 0;
}
width = 0.f;
height = 0.f;
frames = 0;
}
// Get the width, in pixels, of the 1x image.
float Sprite::Width() const
{
return width;
}
// Get the height, in pixels, of the 1x image.
float Sprite::Height() const
{
return height;
}
// Get the number of frames in the animation.
int Sprite::Frames() const
{
return frames;
}
// Get the offset of the center from the top left corner; this is for easy
// shifting of corner to center coordinates.
Point Sprite::Center() const
{
return Point(.5 * width, .5 * height);
}
// Get the texture index, based on whether the screen is high DPI or not.
uint32_t Sprite::Texture() const
{
return Texture(Screen::IsHighResolution());
}
// Get the index of the texture for the given high DPI mode.
uint32_t Sprite::Texture(bool isHighDPI) const
{
return (isHighDPI && texture[1]) ? texture[1] : texture[0];
}
// Get the texture index, based on whether the screen is high DPI or not.
uint32_t Sprite::SwizzleMask() const
{
return SwizzleMask(Screen::IsHighResolution());
}
// Get the index of the texture for the given high DPI mode.
uint32_t Sprite::SwizzleMask(bool isHighDPI) const
{
return (isHighDPI && swizzleMask[1]) ? swizzleMask[1] : swizzleMask[0];
}
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