ambient_occlusion.h

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#ifndef H_OGF_RENDERER_CONTEXT_AMBIENT_OCCLUSION_H
#define H_OGF_RENDERER_CONTEXT_AMBIENT_OCCLUSION_H
 
#include <geogram_gfx/basic/common.h>
#include <geogram_gfx/full_screen_effects/full_screen_effect.h>
#include <geogram_gfx/basic/frame_buffer_object.h>
 
namespace GEO {
 
    class GEOGRAM_GFX_API AmbientOcclusionImpl : public FullScreenEffectImpl {
    public:
 
        AmbientOcclusionImpl();
 
        ~AmbientOcclusionImpl() override;
 
        double required_GLSL_version() const override;
 
        void pre_render(index_t w, index_t h) override;
 
        void post_render() override;
 
        void update() override;
 
        index_t get_lightness() const {
            return lightness_;
        }
 
        void set_lightness(index_t x) {
            lightness_ = x;
        }
 
        index_t get_contrast() const {
            return contrast_;
        }
 
        void set_contrast(index_t x) {
            contrast_ = x;
        }
 
        index_t get_blur_width() const {
            return blur_width_;
        }
 
        void set_blur_width(index_t x) {
            blur_width_ = x;
        }
 
        index_t get_nb_directions() const {
            return nb_directions_;
        }
 
        void set_nb_directions(index_t x) {
            nb_directions_ = x;
        }
 
        double get_max_radius() const {
            return max_radius_;
        }
 
        void set_max_radius(double x) {
            max_radius_ = x;
            geo_clamp(max_radius_, 0.0, 1.0);
        }
 
        double get_step_mul() const {
            return step_mul_;
        }
 
        void set_step_mul(double x) {
            step_mul_ = std::max(x,1.0);
        }
 
    protected:
        void initialize(index_t w, index_t h) override;
 
        void resize(index_t w, index_t h) override;
 
        void create_random_tex();
 
        void display_final_texture();
 
        void compute_SSAO();
 
        void blur();
 
        void get_proj_inv();
 
    private:
        index_t lightness_;
        index_t contrast_;
        index_t blur_width_;
        index_t nb_directions_;
        double  max_radius_;
        double  step_mul_;
 
        GLint proj_inv_loc_;
        GLfloat proj_inv_[16];
 
        GLuint random_tex_;
        GLuint SSAO_program_;
 
        // Blur
        FrameBufferObject blur_1_;
        FrameBufferObject blur_2_;
        GLuint blur_program_;
    };
 
    typedef SmartPointer<AmbientOcclusionImpl> AmbientOcclusionImpl_var ;
 
}
 
#endif