paz_graphics/texture_linux.cpp at main · pazvirtual/paz_graphics · GitHub

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#include "detect_os.hpp"

#ifdef PAZ_LINUX

#include "PAZ_Graphics"
#include "util_linux.hpp"
#include "internal_data.hpp"
#include "common.hpp"
#include "gl_core_4_1.h"

#define CASE(a, b) case paz::WrapMode::a: return GL_##b;

static GLint wrap_mode(paz::WrapMode m)
{
    switch(m)
    {
        CASE(Repeat, REPEAT)
        CASE(MirrorRepeat, MIRRORED_REPEAT)
        CASE(ClampToEdge, CLAMP_TO_EDGE)
        CASE(ClampToZero, CLAMP_TO_BORDER)
    }

    throw std::logic_error("Invalid texture wrapping mode requested.");
}

paz::Texture::Data::~Data()
{
    if(_isRenderTarget)
    {
        unregister_target(this);
    }

    if(_id)
    {
        glDeleteTextures(1, &_id);
    }
}

paz::Texture::Texture()
{
    initialize();
}

paz::Texture::Texture(TextureFormat format, int width, int height, MinMagFilter
    minFilter, MinMagFilter magFilter, MipmapFilter mipFilter, WrapMode wrapS,
    WrapMode wrapT)
{
    initialize();

    _data = std::make_shared<Data>();
    _data->_width = width;
    _data->_height = height;
    _data->_format = format;
    _data->_minFilter = minFilter;
    _data->_magFilter = magFilter;
    _data->_mipFilter = mipFilter;
    _data->_wrapS = wrapS;
    _data->_wrapT = wrapT;
    _data->init();
}

paz::Texture::Texture(TextureFormat format, int width, int height, const void*
    data, MinMagFilter minFilter, MinMagFilter magFilter, MipmapFilter
    mipFilter, WrapMode wrapS, WrapMode wrapT)
{
    initialize();

    _data = std::make_shared<Data>();
    _data->_width = width;
    _data->_height = height;
    _data->_format = format;
    _data->_minFilter = minFilter;
    _data->_magFilter = magFilter;
    _data->_mipFilter = mipFilter;
    _data->_wrapS = wrapS;
    _data->_wrapT = wrapT;
    _data->init(data);
}

paz::Texture::Texture(const Image& image, MinMagFilter minFilter, MinMagFilter
    magFilter, MipmapFilter mipFilter, WrapMode wrapS, WrapMode wrapT)
{
    initialize();

    _data = std::make_shared<Data>();
    _data->_width = image.width();
    _data->_height = image.height();
    _data->_format = static_cast<TextureFormat>(image.format());
    _data->_minFilter = minFilter;
    _data->_magFilter = magFilter;
    _data->_mipFilter = mipFilter;
    _data->_wrapS = wrapS;
    _data->_wrapT = wrapT;
    _data->init(image.bytes().data());
}

paz::Texture::Texture(RenderTarget&& target) : _data(std::move(target._data)) {}

void paz::Texture::Data::init(const void* data)
{
    // Textures not for rendering are static (for now).
    if(!_isRenderTarget && !data)
    {
        throw std::logic_error("Cannot initialize static texture without data."
            );
    }

    // This is because of Metal restrictions.
    if((_format == TextureFormat::Depth16UNorm || _format == TextureFormat::
        Depth32Float) && _mipFilter != MipmapFilter::None)
    {
        throw std::runtime_error("Depth/stencil textures do not support mipmapp"
            "ing.");
    }

    glGenTextures(1, &_id);
    glBindTexture(GL_TEXTURE_2D, _id);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
    glTexImage2D(GL_TEXTURE_2D, 0, gl_internal_format(_format), _width, _height,
        0, gl_format(_format), gl_type(_format), data);
    if(_mipFilter == MipmapFilter::Anisotropic)
    {
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
            GL_LINEAR_MIPMAP_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, Window::
            MaxAnisotropy());
    }
    else
    {
        const auto filters = min_mag_filter(_minFilter, _magFilter, _mipFilter);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filters.first);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filters.second);
    }
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap_mode(_wrapS));
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap_mode(_wrapT));

    ensureMipmaps();
}

void paz::Texture::Data::resize(int width, int height)
{
    if(_scale)
    {
        _width = _scale*width;
        _height = _scale*height;
        glBindTexture(GL_TEXTURE_2D, _id);
        glTexImage2D(GL_TEXTURE_2D, 0, gl_internal_format(_format), _width,
            _height, 0, gl_format(_format), gl_type(_format), nullptr);
        ensureMipmaps();
    }
}

void paz::Texture::Data::ensureMipmaps()
{
    if(_mipFilter != MipmapFilter::None)
    {
        glBindTexture(GL_TEXTURE_2D, _id);
        glGenerateMipmap(GL_TEXTURE_2D);
    }
}

int paz::Texture::width() const
{
    return _data ? _data->_width : 0;
}

int paz::Texture::height() const
{
    return _data ? _data->_height : 0;
}

#endif