Implement two-pass rendering for transparent objects

If object has both opaque parts and transparent parts it will be rendered
incorrectly due to no z-buffering. Add two-pass method to render the
opaque and transparent parts separately.

- Add opaque pixel check to transparency check of images.
- Add alpha test rendering to default material shadows too.

Task-number: QT3DS-3515
Change-Id: I9700b8fb463df9143c5bb9cbe66c7570081ebf5c
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/render/backends/gl/Qt3DSOpenGLUtil.h b/src/render/backends/gl/Qt3DSOpenGLUtil.h
index 32f7dad..47f4230 100644
--- a/src/render/backends/gl/Qt3DSOpenGLUtil.h
+++ b/src/render/backends/gl/Qt3DSOpenGLUtil.h
@@ -1757,7 +1757,7 @@ namespace render {
             return NVRenderClearFlags(retval);
         }
 
-        static GLenum fromDrawModeToGL(NVRenderDrawMode::Enum value, bool inTesselationSupported)
+        static GLenum fromDrawModeToGL(NVRenderDrawMode::Enum value, bool inTessellationSupported)
         {
             switch (value) {
             case NVRenderDrawMode::Points:
@@ -1775,7 +1775,7 @@ namespace render {
             case NVRenderDrawMode::Triangles:
                 return GL_TRIANGLES;
             case NVRenderDrawMode::Patches:
-                return (inTesselationSupported) ? GL_PATCHES : GL_TRIANGLES;
+                return (inTessellationSupported) ? GL_PATCHES : GL_TRIANGLES;
             default:
                 break;
             }