slideshow: Fix what was remaining to be able to use a core context

Change-Id: Ifb22c75c77d6bb5d3f144a1ed92bbcdf8d1112fd
(cherry picked from commit c831e4851f35ddef5ef45062ba291d07dda4b1b4)

3 files changed, 15 insertions, 10 deletions

diff --git a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.cxx b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.cxx
index 09ccc6d31b7e..649190af242a 100644
--- a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.cxx
+++ b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.cxx
@@ -143,6 +143,9 @@ void OGLTransitionImpl::prepare( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteri
         m_nSceneTransformLocation = glGetUniformLocation( m_nProgramObject, "u_sceneTransformMatrix" );
         m_nOperationsTransformLocation = glGetUniformLocation( m_nProgramObject, "u_operationsTransformMatrix" );
 
+        glGenVertexArrays(1, &m_nVertexArrayObject);
+        glBindVertexArray(m_nVertexArrayObject);
+
         glGenBuffers(1, &m_nVertexBufferObject);
         glBindBuffer(GL_ARRAY_BUFFER, m_nVertexBufferObject);
 
@@ -186,6 +189,8 @@ void OGLTransitionImpl::finish()
     if( m_nProgramObject ) {
         glDeleteBuffers(1, &m_nVertexBufferObject);
         m_nVertexBufferObject = 0;
+        glDeleteVertexArrays(1, &m_nVertexArrayObject);
+        m_nVertexArrayObject = 0;
         glDeleteProgram( m_nProgramObject );
         m_nProgramObject = 0;
     }
@@ -220,7 +225,6 @@ void OGLTransitionImpl::displaySlides_( double nTime, sal_Int32 glLeavingSlideTe
         }
     }
 
-    glEnable(GL_TEXTURE_2D);
     glActiveTexture( GL_TEXTURE2 );
     glBindTexture( GL_TEXTURE_2D, glEnteringSlideTex );
     glActiveTexture( GL_TEXTURE0 );
@@ -301,9 +305,8 @@ OGLTransitionImpl::displaySlide(
 
 void OGLTransitionImpl::displayScene( double nTime, double SlideWidth, double SlideHeight, double DispWidth, double DispHeight )
 {
-    CHECK_GL_ERROR();
     const SceneObjects_t& rSceneObjects(maScene.getSceneObjects());
-    glEnable(GL_TEXTURE_2D);
+    CHECK_GL_ERROR();
     for(size_t i(0); i != rSceneObjects.size(); ++i)
         rSceneObjects[i]->display(m_nSceneTransformLocation, m_nPrimitiveTransformLocation, nTime, SlideWidth, SlideHeight, DispWidth, DispHeight);
     CHECK_GL_ERROR();
@@ -389,7 +392,7 @@ void Iris::prepare()
 
     glGenTextures(1, &maTexture);
     glBindTexture(GL_TEXTURE_2D, maTexture);
-    glTexImage2D(GL_TEXTURE_2D, 0, 3, 1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, img);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, img);
     glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
     glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
     glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
@@ -749,8 +752,6 @@ void RochadeTransition::displaySlides_( double nTime, sal_Int32 glLeavingSlideTe
 {
     applyOverallOperations( nTime, SlideWidthScale, SlideHeightScale );
 
-    glEnable(GL_TEXTURE_2D);
-
     if( nTime > .5) {
         displaySlide( nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale );
         displaySlide( nTime, glEnteringSlideTex, getScene().getEnteringSlide(), SlideWidthScale, SlideHeightScale );
@@ -1528,7 +1529,7 @@ void VortexTransition::prepare( double, double, double, double, double )
     glVertexAttribPointer(mnTileInfoLocation, 1, GL_FLOAT, GL_FALSE, 0, nullptr);
     CHECK_GL_ERROR();
 
-    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ARRAY_BUFFER, m_nVertexBufferObject);
     CHECK_GL_ERROR();
 }
 
@@ -1591,7 +1592,7 @@ void VortexTransition::prepareTransition( sal_Int32 glLeavingSlideTex, sal_Int32
     glBufferData(GL_ARRAY_BUFFER, mvTileInfo.size()*sizeof(GLfloat), mvTileInfo.data(), GL_STATIC_DRAW);
     CHECK_GL_ERROR();
 
-    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ARRAY_BUFFER, m_nVertexBufferObject);
     CHECK_GL_ERROR();
 }
 
diff --git a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx
index 0bd15d61ce88..756800657e85 100644
--- a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx
+++ b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx
@@ -228,12 +228,16 @@ private:
     GLint m_nNormalLocation = -1;
     GLint m_nTexCoordLocation = -1;
 
-    GLuint m_nVertexBufferObject = -1;
+    GLuint m_nVertexArrayObject = -1;
 
 protected:
     /** GLSL program object
      */
     GLuint m_nProgramObject = 0;
+
+    /** VBO in which to put primitive data
+     */
+    GLuint m_nVertexBufferObject = -1;
 };
 
 
diff --git a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionerImpl.cxx b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionerImpl.cxx
index 5d6a8553726b..5788a0c07290 100644
--- a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionerImpl.cxx
+++ b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionerImpl.cxx
@@ -984,7 +984,7 @@ void OGLTransitionerImpl::impl_createTexture(
             maSlideBitmapLayout.ColorSpace->convertToIntegerColorSpace(
                 data,
                 getOGLColorSpace()));
-        buildMipmaps(     4,
+        buildMipmaps(     GL_RGBA,
                           maSlideSize.Width,
                           maSlideSize.Height,
                           GL_RGBA,