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-rw-r--r--src/opengl/qglframebufferobject.cpp14
1 files changed, 12 insertions, 2 deletions
diff --git a/src/opengl/qglframebufferobject.cpp b/src/opengl/qglframebufferobject.cpp
index f226861e78..84bce7e03e 100644
--- a/src/opengl/qglframebufferobject.cpp
+++ b/src/opengl/qglframebufferobject.cpp
@@ -454,8 +454,18 @@ void QGLFramebufferObjectPrivate::init(QGLFramebufferObject *q, const QSize &sz,
glBindTexture(target, texture);
glTexImage2D(target, 0, internal_format, size.width(), size.height(), 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- if (mipmap)
- glGenerateMipmap(GL_TEXTURE_2D);
+ if (mipmap) {
+ int width = size.width();
+ int height = size.height();
+ int level = 0;
+ while (width > 1 || height > 1) {
+ width = (width + 1) >> 1;
+ height = (height + 1) >> 1;
+ ++level;
+ glTexImage2D(target, level, internal_format, width, height, 0,
+ GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ }
+ }
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);