slideshow: Upload the projection and modelview matrices as uniforms

Change-Id: I9d6c3ad0d2cc2f691afb2c8622471286f8a5e1c7
(cherry picked from commit 7d1c123a55d222868e27673685c25d62b1e96cd5)

5 files changed, 51 insertions, 41 deletions

diff --git a/slideshow/opengl/basicVertexShader.glsl b/slideshow/opengl/basicVertexShader.glsl
index a4b258c69043..ebd5dbcc6585 100644
--- a/slideshow/opengl/basicVertexShader.glsl
+++ b/slideshow/opengl/basicVertexShader.glsl
@@ -28,6 +28,8 @@
 
 #version 120
 
+uniform mat4 u_projectionMatrix;
+uniform mat4 u_modelViewMatrix;
 uniform mat4 u_sceneTransformMatrix;
 uniform mat4 u_primitiveTransformMatrix;
 uniform mat4 u_operationsTransformMatrix;
@@ -37,9 +39,9 @@ varying vec3 v_normal;
 
 void main( void )
 {
-    mat4 modelViewMatrix = gl_ModelViewMatrix * u_operationsTransformMatrix * u_sceneTransformMatrix * u_primitiveTransformMatrix;
+    mat4 modelViewMatrix = u_modelViewMatrix * u_operationsTransformMatrix * u_sceneTransformMatrix * u_primitiveTransformMatrix;
     mat3 normalMatrix = mat3(transpose(inverse(modelViewMatrix)));
-    gl_Position = gl_ProjectionMatrix * modelViewMatrix * gl_Vertex;
+    gl_Position = u_projectionMatrix * modelViewMatrix * gl_Vertex;
     v_texturePosition = gl_MultiTexCoord0.xy;
     v_normal = normalize(normalMatrix * gl_Normal);
 }
diff --git a/slideshow/opengl/reflectionVertexShader.glsl b/slideshow/opengl/reflectionVertexShader.glsl
index ad9b0330322d..566eafa7590b 100644
--- a/slideshow/opengl/reflectionVertexShader.glsl
+++ b/slideshow/opengl/reflectionVertexShader.glsl
@@ -28,6 +28,8 @@
 
 #version 130
 
+uniform mat4 u_projectionMatrix;
+uniform mat4 u_modelViewMatrix;
 uniform mat4 u_sceneTransformMatrix;
 uniform mat4 u_primitiveTransformMatrix;
 uniform mat4 u_operationsTransformMatrix;
@@ -38,9 +40,9 @@ varying float v_isShadow;
 
 void main( void )
 {
-    mat4 modelViewMatrix = gl_ModelViewMatrix * u_operationsTransformMatrix * u_sceneTransformMatrix * u_primitiveTransformMatrix;
+    mat4 modelViewMatrix = u_modelViewMatrix * u_operationsTransformMatrix * u_sceneTransformMatrix * u_primitiveTransformMatrix;
     mat3 normalMatrix = mat3(transpose(inverse(modelViewMatrix)));
-    gl_Position = gl_ProjectionMatrix * modelViewMatrix * gl_Vertex;
+    gl_Position = u_projectionMatrix * modelViewMatrix * gl_Vertex;
     v_texturePosition = gl_MultiTexCoord0.xy;
     v_normal = normalize(normalMatrix * gl_Normal);
     v_isShadow = float(gl_VertexID >= 6);
diff --git a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.cxx b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.cxx
index aab8508bc5e9..025c9805672f 100644
--- a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.cxx
+++ b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.cxx
@@ -74,6 +74,43 @@ void OGLTransitionImpl::setScene(TransitionScene const& rScene)
     maScene = rScene;
 }
 
+void OGLTransitionImpl::uploadModelViewProjectionMatrices()
+{
+    double EyePos(10.0);
+    double RealF(1.0);
+    double RealN(-1.0);
+    double RealL(-1.0);
+    double RealR(1.0);
+    double RealB(-1.0);
+    double RealT(1.0);
+    double ClipN(EyePos+5.0*RealN);
+    double ClipF(EyePos+15.0*RealF);
+    double ClipL(RealL*8.0);
+    double ClipR(RealR*8.0);
+    double ClipB(RealB*8.0);
+    double ClipT(RealT*8.0);
+
+    glm::mat4 projection = glm::frustum<float>(ClipL, ClipR, ClipB, ClipT, ClipN, ClipF);
+    //This scaling is to take the plane with BottomLeftCorner(-1,-1,0) and TopRightCorner(1,1,0) and map it to the screen after the perspective division.
+    glm::vec3 scale(1.0 / (((RealR * 2.0 * ClipN) / (EyePos * (ClipR - ClipL))) - ((ClipR + ClipL) / (ClipR - ClipL))),
+                    1.0 / (((RealT * 2.0 * ClipN) / (EyePos * (ClipT - ClipB))) - ((ClipT + ClipB) / (ClipT - ClipB))),
+                    1.0);
+    projection = glm::scale(projection, scale);
+    glm::mat4 modelview = glm::translate(glm::mat4(), glm::vec3(0, 0, -EyePos));
+
+    GLint location = glGetUniformLocation( m_nProgramObject, "u_projectionMatrix" );
+    if( location != -1 ) {
+        glUniformMatrix4fv(location, 1, false, glm::value_ptr(projection));
+        CHECK_GL_ERROR();
+    }
+
+    location = glGetUniformLocation( m_nProgramObject, "u_modelViewMatrix" );
+    if( location != -1 ) {
+        glUniformMatrix4fv(location, 1, false, glm::value_ptr(modelview));
+        CHECK_GL_ERROR();
+    }
+}
+
 void OGLTransitionImpl::prepare( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex )
 {
     const SceneObjects_t& rSceneObjects(maScene.getSceneObjects());
@@ -100,6 +137,8 @@ void OGLTransitionImpl::prepare( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteri
             CHECK_GL_ERROR();
         }
 
+        uploadModelViewProjectionMatrices();
+
         m_nPrimitiveTransformLocation = glGetUniformLocation( m_nProgramObject, "u_primitiveTransformMatrix" );
         m_nSceneTransformLocation = glGetUniformLocation( m_nProgramObject, "u_sceneTransformMatrix" );
         m_nOperationsTransformLocation = glGetUniformLocation( m_nProgramObject, "u_operationsTransformMatrix" );
diff --git a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx
index 61aed6d05e67..c972ff37f587 100644
--- a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx
+++ b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx
@@ -212,6 +212,10 @@ private:
     TransitionScene maScene;
     const TransitionSettings maSettings;
 
+    /** Calculates the projection and model/view matrices, and upload them.
+     */
+    void uploadModelViewProjectionMatrices();
+
     /** Uniform location for primitive transform
      */
     GLint m_nPrimitiveTransformLocation = -1;
diff --git a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionerImpl.cxx b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionerImpl.cxx
index f808a1f5fa35..5d6a8553726b 100644
--- a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionerImpl.cxx
+++ b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionerImpl.cxx
@@ -207,7 +207,6 @@ protected:
             bool useMipmap,
             uno::Sequence<sal_Int8>& data,
             const OGLFormat* pFormat );
-    static void prepareEnvironment();
     const OGLFormat* chooseFormats();
 
 private:
@@ -532,7 +531,6 @@ void OGLTransitionerImpl::impl_prepareSlides()
 
 void OGLTransitionerImpl::impl_prepareTransition()
 {
-    prepareEnvironment();
     if( mpTransition && mpTransition->getSettings().mnRequiredGLVersion <= mnGLVersion )
         mpTransition->prepare( maLeavingSlideGL, maEnteringSlideGL );
 }
@@ -1014,41 +1012,6 @@ void OGLTransitionerImpl::impl_createTexture(
     CHECK_GL_ERROR();
 }
 
-void OGLTransitionerImpl::prepareEnvironment()
-{
-    double EyePos(10.0);
-    double RealF(1.0);
-    double RealN(-1.0);
-    double RealL(-1.0);
-    double RealR(1.0);
-    double RealB(-1.0);
-    double RealT(1.0);
-    double ClipN(EyePos+5.0*RealN);
-    double ClipF(EyePos+15.0*RealF);
-    double ClipL(RealL*8.0);
-    double ClipR(RealR*8.0);
-    double ClipB(RealB*8.0);
-    double ClipT(RealT*8.0);
-
-    CHECK_GL_ERROR();
-    glMatrixMode(GL_PROJECTION);
-    glm::mat4 projection = glm::frustum<float>(ClipL, ClipR, ClipB, ClipT, ClipN, ClipF);
-    //This scaling is to take the plane with BottomLeftCorner(-1,-1,0) and TopRightCorner(1,1,0) and map it to the screen after the perspective division.
-    glm::vec3 scale(1.0 / (((RealR * 2.0 * ClipN) / (EyePos * (ClipR - ClipL))) - ((ClipR + ClipL) / (ClipR - ClipL))),
-                    1.0 / (((RealT * 2.0 * ClipN) / (EyePos * (ClipT - ClipB))) - ((ClipT + ClipB) / (ClipT - ClipB))),
-                    1.0);
-    projection = glm::scale(projection, scale);
-    CHECK_GL_ERROR();
-    glLoadMatrixf(glm::value_ptr(projection));
-
-    CHECK_GL_ERROR();
-    glMatrixMode(GL_MODELVIEW);
-    glm::mat4 modelview = glm::translate(glm::mat4(), glm::vec3(0, 0, -EyePos));
-    CHECK_GL_ERROR();
-    glLoadMatrixf(glm::value_ptr(modelview));
-    CHECK_GL_ERROR();
-}
-
 const OGLFormat* OGLTransitionerImpl::chooseFormats()
 {
     const OGLFormat* pDetectedFormat=nullptr;