From 28eaf11cf3b220871b97d9ba40d5058a84bcba09 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@mplayer2.org>
Date: Thu, 6 Oct 2011 20:46:01 +0200
Subject: vo_gl: implement screenshots

---
 libvo/gl_common.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'libvo/gl_common.c')

diff --git a/libvo/gl_common.c b/libvo/gl_common.c
index bbcbeb2f3b..f433f5642d 100644
--- a/libvo/gl_common.c
+++ b/libvo/gl_common.c
@@ -71,6 +71,7 @@ void glAdjustAlignment(GL *gl, int stride)
     else
         gl_alignment = 1;
     gl->PixelStorei(GL_UNPACK_ALIGNMENT, gl_alignment);
+    gl->PixelStorei(GL_PACK_ALIGNMENT, gl_alignment);
 }
 
 struct gl_name_map_struct {
@@ -634,6 +635,24 @@ void glUploadTex(GL *gl, GLenum target, GLenum format, GLenum type,
         gl->TexSubImage2D(target, 0, x, y, w, y_max - y, format, type, data);
 }
 
+/**
+ * \brief download a texture, handling things like stride and slices
+ * \param target texture target, usually GL_TEXTURE_2D
+ * \param format OpenGL format of data
+ * \param type OpenGL type of data
+ * \param dataptr destination memory for download
+ * \param stride data stride (must be positive)
+ * \ingroup gltexture
+ */
+void glDownloadTex(GL *gl, GLenum target, GLenum format, GLenum type,
+                   void *dataptr, int stride)
+{
+    // this is not always correct, but should work for MPlayer
+    glAdjustAlignment(gl, stride);
+    gl->PixelStorei(GL_PACK_ROW_LENGTH, stride / glFmt2bpp(format, type));
+    gl->GetTexImage(target, 0, format, type, dataptr);
+}
+
 /**
  * \brief Setup ATI version of register combiners for YUV to RGB conversion.
  * \param csp_params parameters used for colorspace conversion
-- 
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