qwt3d_render_context.h

#ifndef QWT3D_RENDER_CONTEXT_H
#define QWT3D_RENDER_CONTEXT_H
 
#include "qwt3d_global.h"
#include "qwt3d_types.h"
 
#include <QMatrix4x4>
#include <QOpenGLShaderProgram>
#include <QPointF>
#include <QSize>
 
struct QWT3D_EXPORT Qwt3DRenderContext
{
    // Matrices — current at time of construction (per-call-site in paintGL)
    QMatrix4x4 modelView;
    QMatrix4x4 projection;
 
    // Viewport in pixels (already resolved from widget size fallback)
    QSize viewport;
 
    // True while the scene is replayed for the gl2ps vector capture: line and
    // polygon draws then use qwt3dEmitVerticesForVectorExport() instead of the
    // shader paths (the feedback buffer needs explicit colors)
    bool vectorExport = false;
 
    // Shared shader programs (non-owning pointers, valid during paintGL)
    QOpenGLShaderProgram* lineShader = nullptr;
    QOpenGLShaderProgram* polygonShader = nullptr;
    QOpenGLShaderProgram* textShader = nullptr;
 
    // Projects a world-space point to screen (viewport) pixel coordinates
    QPointF worldToScreen(const Triple& world) const;
 
    // Unprojects a screen (viewport) pixel point to world-space coordinates
    Triple screenToWorld(const QPointF& screen) const;
 
    // Converts a relative viewport position [0..1] to world coordinates
    Triple relativePosition(Triple rel) const;
};
 
#endif