class mrpt::opengl::LinesProxyBase

Overview

Specialization for proxies that render lines/wireframes.

This provides common functionality for all line-based rendering, including vertex, color, and line parameter management.

See also:

mrpt::viz::VisualObjectParams_Lines

#include <mrpt/opengl/RenderableProxy.h>

class LinesProxyBase: public mrpt::opengl::RenderableProxy
{
public:
    // construction

    LinesProxyBase();

    // methods

    virtual void compile(const mrpt::viz::CVisualObject* sourceObj);
    virtual void updateBuffers(const mrpt::viz::CVisualObject* sourceObj);
    virtual void render(const RenderContext& rc) const;
    virtual const char* typeName() const;
};

// direct descendants

class LinesProxy;

Inherited Members

public:
    // methods

    virtual void compile(const mrpt::viz::CVisualObject* sourceObj) = 0;
    virtual void updateBuffers(const mrpt::viz::CVisualObject* sourceObj);
    virtual void render(const RenderContext& rc) const = 0;
    virtual std::vector<shader_id_t> requiredShaders() const = 0;
    virtual bool castsShadows() const;
    virtual mrpt::math::TBoundingBoxf getBoundingBoxLocal() const;
    virtual const char* typeName() const;
    RenderableProxy& operator = (const RenderableProxy&);
    RenderableProxy& operator = (RenderableProxy&&);

Methods

virtual void compile(const mrpt::viz::CVisualObject* sourceObj)

Initial compilation: uploads object data to GPU.

This is called once when the proxy is first created. It should:

  • Create OpenGL buffers (VBOs, VAOs, textures)

  • Upload initial vertex/color/normal/texture data

  • Cache any frequently-used values

Must be called from OpenGL context thread

After this call, the proxy should be ready to render

Parameters:

sourceObj

The abstract viz object (read-only access)

 
virtual void updateBuffers(const mrpt::viz::CVisualObject* sourceObj)

Incremental update: refreshes GPU buffers with changed data.

This is called when the source object’s dirty flag is set (hasToUpdateBuffers() returns true). It should:

  • Re-upload only the changed data (vertices, colors, etc.)

  • Be as efficient as possible (don’t recompile everything)

Must be called from OpenGL context thread

Default implementation calls compile() - override for efficiency

Parameters:

sourceObj

The abstract viz object (read-only access)

 
virtual void render(const RenderContext& rc) const

Renders this object using the provided context.

This is called every frame for visible objects. It should:

  • Bind appropriate buffers (VAO, VBO, textures)

  • Set shader uniforms (model matrix, material properties, etc.)

  • Issue draw calls (glDrawArrays, glDrawElements, etc.)

Must be called from OpenGL context thread

The shader program is already bound when this is called

Common matrices (P, V, M) are already uploaded by CompiledViewport

Parameters:

rc

Rendering context (shader, matrices, lights)

 
virtual const char* typeName() const

Returns a human-readable type name for this proxy.

Used for debugging and logging.