0001-Add-constructor-to-GLTexture-using-GL_EXT_memory_obj.patch

From 5b369d50098db47eace62e76d86ac22f09d2f506 Mon Sep 17 00:00:00 2001
From: Christoph Haag <christoph.haag@collabora.com>
Date: Mon, 19 Aug 2019 17:31:11 +0200
Subject: [PATCH] Add constructor to GLTexture using GL_EXT_memory_object

Instead of allocating memory for the texture with OpenGL, import the memory from an FD.
---
 libkwineffects/kwingltexture.cpp | 31 +++++++++++++++++++++++++++++++
 libkwineffects/kwingltexture.h   |  1 +
 2 files changed, 32 insertions(+)

diff --git a/libkwineffects/kwingltexture.cpp b/libkwineffects/kwingltexture.cpp
index 3818fe242..e0e924cbf 100644
--- a/libkwineffects/kwingltexture.cpp
+++ b/libkwineffects/kwingltexture.cpp
@@ -234,6 +234,37 @@ GLTexture::GLTexture(GLenum internalFormat, int width, int height, int levels)
     unbind();
 }
 
+GLTexture::GLTexture(GLenum internalFormat, int width, int height, int fd, size_t size, int levels)
+     : d_ptr(new GLTexturePrivate())
+{
+    Q_D(GLTexture);
+
+    d->m_target = GL_TEXTURE_2D;
+    d->m_scale.setWidth(1.0 / width);
+    d->m_scale.setHeight(1.0 / height);
+    d->m_size = QSize(width, height);
+    d->m_canUseMipmaps = levels > 1;
+    d->m_mipLevels = levels;
+    d->m_filter = levels > 1 ? GL_NEAREST_MIPMAP_LINEAR : GL_NEAREST;
+
+    d->updateMatrix();
+
+    glGenTextures(1, &d->m_texture);
+    bind();
+
+    GLuint memObject = 0;
+    glCreateMemoryObjectsEXT(1, &memObject);
+
+    GLint dedicated = GL_TRUE;
+    glMemoryObjectParameterivEXT(memObject, GL_DEDICATED_MEMORY_OBJECT_EXT, &dedicated);
+    glGetMemoryObjectParameterivEXT(memObject, GL_DEDICATED_MEMORY_OBJECT_EXT, &dedicated);
+    glImportMemoryFdEXT(memObject, size, GL_HANDLE_TYPE_OPAQUE_FD_EXT, fd);
+    glTexStorageMem2DEXT(GL_TEXTURE_2D, 1, GL_RGBA8, width, height, memObject, 0);
+    glDeleteMemoryObjectsEXT(1, &memObject);
+
+    unbind();
+}
+
 GLTexture::GLTexture(GLenum internalFormat, const QSize &size, int levels)
     : GLTexture(internalFormat, size.width(), size.height(), levels)
 {
diff --git a/libkwineffects/kwingltexture.h b/libkwineffects/kwingltexture.h
index 98b409848..48d7fc6f1 100644
--- a/libkwineffects/kwingltexture.h
+++ b/libkwineffects/kwingltexture.h
@@ -58,6 +58,7 @@ public:
     explicit GLTexture(const QPixmap& pixmap, GLenum target = GL_TEXTURE_2D);
     explicit GLTexture(const QString& fileName);
     GLTexture(GLenum internalFormat, int width, int height, int levels = 1);
+    GLTexture(GLenum internalFormat, int width, int height, int fd, size_t size, int levels = 1);
     explicit GLTexture(GLenum internalFormat, const QSize &size, int levels = 1);
     virtual ~GLTexture();
 
-- 
2.23.0