Corner pin (#1851)

* Start adding a corner pin node

* Start gizmo support

* Correctly setup QVector2d inputs

* Missing breaks were causing incorect data to be set

* Add ability to override vertex coords

* Get perspective pin working

* Cleanup

* Add none perspective corner pin

* Small optimisation

* Improve comments, clean up and fix bug in job optimisation

* [skip ci] cornerpin: Improve description

* Move GL extension from shader to standard preamble.

* Use #version 130 for mobile GPU compatibility

* Cache half resolution

* Use built in NodeInputDragger::GetStartValue

* Pass cnst references to avoid deep copies

Co-authored-by: itsmattkc <itsmattkc@gmail.com>

app/render/job/shaderjob.h

@@ -22,6 +22,7 @@
 #define SHADERJOB_H
 
 #include <QMatrix4x4>
+#include <QVector>
 
 #include "generatejob.h"
 #include "render/texture.h"
@@ -87,6 +88,16 @@ public:
     interpolation_.insert(id, interp);
   }
 
+  void SetVertexCoordinates(const QVector<float> &vertex_coords)
+  {
+    vertex_overrides_ = vertex_coords;
+  }
+
+  const QVector<float>& GetVertexCoordinates()
+  {
+    return vertex_overrides_;
+  }
+
 private:
   QString shader_id_;
 
@@ -96,6 +107,8 @@ private:
 
   QHash<QString, Texture::Interpolation> interpolation_;
 
+  QVector<float> vertex_overrides_;
+
 };
 
 }

app/render/opengl/openglrenderer.cpp

@@ -569,7 +569,13 @@ void OpenGLRenderer::Blit(QVariant s, ShaderJob job, Texture *destination, Video
   QOpenGLBuffer vert_vbo_;
   vert_vbo_.create();
   vert_vbo_.bind();
-  vert_vbo_.allocate(blit_vertices.constData(), blit_vertices.size() * sizeof(GLfloat));
+  // If the job has vertex coordinate overrides use them instead of the defaults.
+  if (!job.GetVertexCoordinates().isEmpty()) {
+    Q_ASSERT(job.GetVertexCoordinates().size() == 18);
+    vert_vbo_.allocate(job.GetVertexCoordinates().constData(), job.GetVertexCoordinates().size() * sizeof(float));
+  } else {
+    vert_vbo_.allocate(blit_vertices.constData(), blit_vertices.size() * sizeof(GLfloat));
+  }
   vert_vbo_.release();
 
   QOpenGLBuffer frag_vbo_;
@@ -886,7 +892,11 @@ GLuint OpenGLRenderer::CompileShader(GLenum type, const QString &code)
       QStringLiteral("#version 120\n\n");
 #endif
 
-  QString complete_code = shader_preamble;
+  QString complete_code;
+
+  if (!code.startsWith(QStringLiteral("#version"))) {
+    complete_code = shader_preamble;
+  }
 
   if (code.isEmpty()) {
     // Use default code