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// SPDX-License-Identifier: GPL-2.0-or-later
#include "texture.h"
namespace Inkscape {
namespace UI {
namespace Widget {
static bool have_gltexstorage()
{
static bool result = [] {
return epoxy_gl_version() >= 42 || epoxy_has_gl_extension("GL_ARB_texture_storage");
}();
return result;
}
static bool have_glinvalidateteximage()
{
static bool result = [] {
return epoxy_gl_version() >= 43 || epoxy_has_gl_extension("ARB_invalidate_subdata");
}();
return result;
}
Texture::Texture(Geom::IntPoint const &size)
: _size(size)
{
glGenTextures(1, &_id);
glBindTexture(GL_TEXTURE_2D, _id);
// Common flags for all textures used at the moment.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
if (have_gltexstorage()) {
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, size.x(), size.y());
} else {
// Note: This fallback path is always chosen on the Mac due to Apple's crippling of OpenGL.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, size.x(), size.y(), 0, GL_BGRA, GL_UNSIGNED_BYTE, nullptr);
}
}
void Texture::invalidate()
{
if (have_glinvalidateteximage()) {
glInvalidateTexImage(_id, 0);
}
}
} // namespace Widget
} // namespace UI
} // namespace Inkscape
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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