Adding upstream version 1.3+ds.upstream/1.3+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/src/ui/widget/canvas/texture.cpp b/src/ui/widget/canvas/texture.cpp
new file mode 100644
index 0000000..420937a
--- /dev/null
+++ b/src/ui/widget/canvas/texture.cpp
@@ -0,0 +1,66 @@
+// 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 :