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#ifndef LLMR_GEOMETRY_LINE_BUFFER
#define LLMR_GEOMETRY_LINE_BUFFER
#include "buffer.hpp"
namespace llmr {
class LineBuffer : public Buffer<
8 // 2 coordinates per vertex + 1 linesofar + 1 extrude coord pair == 4 (== 8 bytes)
> {
public:
typedef int16_t vertex_type;
/*
* Scale the extrusion vector so that the normal length is this value.
* Contains the "texture" normals (-1..1). This is distinct from the extrude
* normals for line joins, because the x-value remains 0 for the texture
* normal array, while the extrude normal actually moves the vertex to create
* the acute/bevelled line join.
*/
const int8_t extrudeScale = 63;
/*
* Add a vertex to this buffer
*
* @param {number} x vertex position
* @param {number} y vertex position
* @param {number} ex extrude normal
* @param {number} ey extrude normal
* @param {number} tx texture normal
* @param {number} ty texture normal
*/
void add(vertex_type x, vertex_type y, float ex, float ey, int8_t tx, int8_t ty, int32_t linesofar = 0);
/*
* Add a degenerate triangle to the buffer
*
* > So we need a way to get from the end of one triangle strip
* to the beginning of the next strip without actually filling triangles
* on the way. We can do this with "degenerate" triangles: We simply
* repeat the last coordinate of the first triangle strip and the first
* coordinate of the next triangle strip.
*/
void addDegenerate();
};
}
#endif
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