Implement volume rendering support

New subclass of QCustom3DItem, QCustom3DVolume is provided.
The documentation for the example will be done in a separate commit.

Change-Id: Idb3fdb0654c6bec7606ca012b75852a5a8412397
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/datavisualization/utils/shaderhelper.cpp b/src/datavisualization/utils/shaderhelper.cpp
index 7fb237c6..3c3d93ac 100644
--- a/src/datavisualization/utils/shaderhelper.cpp
+++ b/src/datavisualization/utils/shaderhelper.cpp
@@ -93,6 +93,10 @@ void ShaderHelper::initialize()
     m_gradientMinUniform = m_program->uniformLocation("gradMin");
     m_gradientHeightUniform = m_program->uniformLocation("gradHeight");
     m_lightColorUniform = m_program->uniformLocation("lightColor");
+    m_volumeSliceIndices = m_program->uniformLocation("volumeSliceIndices");
+    m_colorIndex = m_program->uniformLocation("colorIndex");
+    m_cameraPositionRelativeToModel = m_program->uniformLocation("cameraPositionRelativeToModel");
+    m_color8Bit = m_program->uniformLocation("color8Bit");
     m_initialized = true;
 }
 
@@ -150,6 +154,11 @@ void ShaderHelper::setUniformValue(GLuint uniform, GLint value)
     m_program->setUniformValue(uniform, value);
 }
 
+void ShaderHelper::setUniformValueArray(GLuint uniform, const QVector4D *values, int count)
+{
+    m_program->setUniformValueArray(uniform, values, count);
+}
+
 GLuint ShaderHelper::MVP()
 {
     if (!m_initialized)
@@ -255,6 +264,34 @@ GLuint ShaderHelper::lightColor()
     return m_lightColorUniform;
 }
 
+GLuint ShaderHelper::volumeSliceIndices()
+{
+    if (!m_initialized)
+        qFatal("Shader not initialized");
+    return m_volumeSliceIndices;
+}
+
+GLuint ShaderHelper::colorIndex()
+{
+    if (!m_initialized)
+        qFatal("Shader not initialized");
+    return m_colorIndex;
+}
+
+GLuint ShaderHelper::cameraPositionRelativeToModel()
+{
+    if (!m_initialized)
+        qFatal("Shader not initialized");
+    return m_cameraPositionRelativeToModel;
+}
+
+GLuint ShaderHelper::color8Bit()
+{
+    if (!m_initialized)
+        qFatal("Shader not initialized");
+    return m_color8Bit;
+}
+
 GLuint ShaderHelper::posAtt()
 {
     if (!m_initialized)