qcam: viewfinder_gl: Support #define in shaders

Prepare the infrastructure to support defining preprocessor macros in
shaders:

- Rename the fragmentShaderSrc_ member to fragmentShaderFile_ to reflect
  better that it contains a file name, not shader source code
- Add a new fragmentShaderDefines_ member to store preprocessor macros
- Prepend the macros to the shader source before compiling it

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

1 files changed, 5 insertions, 6 deletions

diff --git a/src/qcam/viewfinder_gl.h b/src/qcam/viewfinder_gl.h
index 7675d0a0..53424dc1 100644
--- a/src/qcam/viewfinder_gl.h
+++ b/src/qcam/viewfinder_gl.h
@@ -65,17 +65,16 @@ private:
 	QSize size_;
 	unsigned char *yuvData_;
 
-	/* OpenGL components for rendering */
-	QOpenGLShader *fragmentShader_;
-	QOpenGLShader *vertexShader_;
+	/* Shaders */
 	QOpenGLShaderProgram shaderProgram_;
+	QOpenGLShader *vertexShader_;
+	QOpenGLShader *fragmentShader_;
+	QString fragmentShaderFile_;
+	QStringList fragmentShaderDefines_;
 
 	/* Vertex buffer */
 	QOpenGLBuffer vertexBuffer_;
 
-	/* Fragment shader file name */
-	QString fragmentShaderSrc_;
-
 	/* YUV texture planars and parameters */
 	GLuint textureUniformU_;
 	GLuint textureUniformV_;