47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#pragma once
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#include "opengl_global.h"
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namespace paysages {
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namespace opengl {
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/**
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* A tool to render an "impostor" of a vegetation layer.
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*/
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class OPENGLSHARED_EXPORT OpenGLVegetationImpostor {
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public:
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OpenGLVegetationImpostor(int partsize = 64);
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~OpenGLVegetationImpostor();
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inline const Texture2D *getTexture() const {
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return texture;
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}
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/**
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* Render a single instance using this impostor.
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*/
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void render(OpenGLShaderProgram *program, const OpenGLVegetationInstance *instance, const Vector3 &camera_location);
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/**
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* Prepare the texture grid for a given model.
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*/
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void prepareTexture(const VegetationModelDefinition &model, const Scenery &environment, bool *interrupt);
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/**
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* Get the impostor grid index for an instance, to face the camera.
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*/
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int getIndex(const Vector3 &camera, const Vector3 &instance) const;
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private:
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void setVertex(int i, float u, float v);
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private:
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OpenGLVertexArray *vertices;
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OpenGLSharedState *state;
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int texture_size;
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bool texture_changed;
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Texture2D *texture;
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};
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}
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}
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