Update libgltf: new build system and various fixes

Building:
- The new tarball has reasonable build system so
build libgltf as external package instead of compiling
source files directly.
- Freetype dependancy is removed

Improvements comes with the new libgltf
- Can rotate the models too (orbit mode)
- Two camera handling mode: walkthrough and orbit
(press M to change).
- gltf_animation_set_time() works
- FPS can be displayed without freetype (press F)

Additional notes:
- There were some bugs/regressions which are fixed
during the integration (see patches).
- License files are uddated now.
- libgltf building is enabled only on those platforms
on which gltf support actually works (windows and linux)

Change-Id: Ia6c9c4da53a9b4fedba0d73aa5791489f8ad424b
Reviewed-on: https://gerrit.libreoffice.org/9895
Reviewed-by: Zolnai Tamás <zolnaitamas2000@gmail.com>
Tested-by: Zolnai Tamás <zolnaitamas2000@gmail.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/external/libgltf/patches/extend_get_bitmap_for_rgba_ones.patch b/external/libgltf/patches/extend_get_bitmap_for_rgba_ones.patch
new file mode 100644
index 000000000000..8b9f3dbf7b25
--- /dev/null
+++ b/external/libgltf/patches/extend_get_bitmap_for_rgba_ones.patch
@@ -0,0 +1,76 @@
+diff -ur libgltf.org/src/RenderScene.cpp libgltf/src/RenderScene.cpp
+--- libgltf.org/src/RenderScene.cpp	2014-06-23 18:49:46.603119797 +0200
++++ libgltf/src/RenderScene.cpp	2014-06-23 19:00:17.583092627 +0200
+@@ -1735,28 +1735,29 @@
+ 

+ void RenderScene::setBitZoom(unsigned char* Dstbuffer,

+                              unsigned char* Srcbuffer,

+-                             glTFViewport* pViewport)

++                             glTFViewport* pViewport,

++                             int bufferDepth )

+ {

+     const int width = pViewport->width;

+     const int height = pViewport->height;

+-    const int newLineByte = (width * 3 + 3) / 4 * 4;

+-    const int lineByte = (width * SSAA * 3 + 3) / 4 * 4;

++    const int newLineByte = width * bufferDepth;

++    const int lineByte = width * SSAA * bufferDepth;

+     for (int i = 0; i < height; i++)

+     {

+         for (int j = 0; j < width; j++)

+-            for (int k = 0; k < 3; k++)

++            for (int k = 0; k < bufferDepth; k++)

+             {

+                 long xData = (long)(i * SSAA + 0.5);

+                 long yData = (long)(j * SSAA + 0.5);

+                 if((yData >= 0) && (yData < width * SSAA) &&

+                    (xData >= 0) && (xData < height * SSAA))

+                 {

+-                    *(Dstbuffer + i * newLineByte + j * 3 + k) =

+-                        *(Srcbuffer + xData * lineByte + yData * 3 + k);

++                    *(Dstbuffer + i * newLineByte + j * bufferDepth + k) =

++                        *(Srcbuffer + xData * lineByte + yData * bufferDepth + k);

+                 }

+                 else

+                 {

+-                    *(Dstbuffer + i * newLineByte + j * 3 + k) = 255;

++                    *(Dstbuffer + i * newLineByte + j * bufferDepth + k) = 255;

+                 }

+             }

+     }

+@@ -1782,12 +1783,20 @@
+     {

+         return;

+     }

+-    int imageSize = ((width + ((4 - (width % 4)) % 4)) *

+-                     height * 3) + 2;

++

++    int bufferDepth;

++    if( format == GL_RGB || format == GL_BGR )

++        bufferDepth = 3;

++    else if( format == GL_RGBA || format == GL_BGRA )

++        bufferDepth = 4;

++    else

++        return;

++

++    int imageSize = width * height * bufferDepth;

+     unsigned char *pbuffer = new unsigned char[imageSize];

+     glReadPixels(0, 0, width, height, format,

+                  GL_UNSIGNED_BYTE, pbuffer);

+-    setBitZoom(buffer, pbuffer, pViewport);

++    setBitZoom(buffer, pbuffer, pViewport, bufferDepth);

+     if (pbuffer)

+     {

+         delete [] pbuffer;

+diff -ur libgltf.org/src/RenderScene.h libgltf/src/RenderScene.h
+--- libgltf.org/src/RenderScene.h	2014-06-23 18:49:46.587119798 +0200
++++ libgltf/src/RenderScene.h	2014-06-23 18:59:46.991093944 +0200
+@@ -234,7 +234,7 @@
+     void completeRenderBitmap(glTFViewport* pViewport,

+                               unsigned char* buffer, GLenum format);

+     void setBitZoom(unsigned char* Dstbuffer,

+-                    unsigned char* Srcbuffer, glTFViewport* pViewport);

++                    unsigned char* Srcbuffer, glTFViewport* pViewport, int bufferDepth );

+ 

+     // For animation

+     void startAnimation();