renderstack::dynamic_rectangle Class Reference

mesh for 2D rectangle that can resize

#include <dynamic_rectangle.hpp>

Inherits renderstack::mesh.

Public Member Functions
	dynamic_rectangle ()
void	update (float x0, float y0, float x1, float y1)

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Detailed Description

Definition at line 36 of file dynamic_rectangle.hpp.

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Constructor & Destructor Documentation

renderstack::dynamic_rectangle::dynamic_rectangle

(

)

Definition at line 32 of file dynamic_rectangle.cpp.

{
    /*  Setup vertex format  */ 
    {
        vertex_attribute position(vertex_attribute_usage_position, GL_FLOAT, 0, 3);

        vertex_buffer()->vertex_format().append(position);
    }

    /*  Initialize buffers  */ 
    mesh::find_or_create_index_buffer(
        mesh_mode_edge_lines,
        GL_ELEMENT_ARRAY_BUFFER, 
        GL_STATIC_DRAW, 
        GL_UNSIGNED_INT, 
        GL_LINES
    );

    update(0.0f, 0.0f, 1.0f, 1.0f);
}

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Member Function Documentation

void renderstack::dynamic_rectangle::update	(	float	x0,
		float	y0,
		float	x1,
		float	y1
	)

Definition at line 55 of file dynamic_rectangle.cpp.

{
    /*    2    3     0.. 3  corners     */ 
    /*                                  */ 
    /*                                  */ 
    /*    0    1                        */ 

    int vertex_index = 0;
    int index        = 0;

    buffer *vertex_buffer = mesh::vertex_buffer();
    buffer *index_buffer  = mesh::index_buffer(mesh_mode_edge_lines);

    vertex_buffer->begin_edit();
    index_buffer->begin_edit();

    /*  Vertices  */ 
    {
        vertex_buffer->set_index(index++); vertex_buffer->put_position(x0, y0, 0.0f);
        vertex_buffer->set_index(index++); vertex_buffer->put_position(x1, y0, 0.0f);
        vertex_buffer->set_index(index++); vertex_buffer->put_position(x0, y1, 0.0f);
        vertex_buffer->set_index(index++); vertex_buffer->put_position(x1, y1, 0.0f);
    }

    /*  Lines  */ 
    /*  Notice that you need to match end points for the lines  */ 
    /*  with start point of other line in order to get all      */ 
    /*  cornerpixels rasterized.                                */ 
    {
        index_buffer->set_index(vertex_index);
        index_buffer->line(0, 1);
        vertex_index += 2;
        index_buffer->set_index(vertex_index);
        index_buffer->line(1, 3);
        vertex_index += 2;
        index_buffer->set_index(vertex_index);
        index_buffer->line(3, 2);
        vertex_index += 2;
        index_buffer->set_index(vertex_index);
        index_buffer->line(2, 0);
        vertex_index += 2;
    }

    /*  Done  */ 
    vertex_buffer->end_edit(index);
    index_buffer->end_edit(vertex_index);
}

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The documentation for this class was generated from the following files:

• dynamic_rectangle.hpp
• dynamic_rectangle.cpp