More work on heightmap probing.

render.h

@@ -12,14 +12,15 @@ class shader_program;
 class program_renderer {
 public:
     void update(const program& pgm, const machine& cnc);
-    void render(glm::mat4 mvp, glm::vec2 viewport_size);
+    void render(glm::mat4 model, glm::mat4 view, glm::mat4 projection, glm::mat3 normal_mat, glm::vec2 viewport_size);
 
     glm::vec3 get_extents_min() const { return min_pos; };
 
     glm::vec3 get_extents_max() const { return max_pos; };
 
+    void update_grid(float from_x, float from_y, float to_x, float to_y, int resolution);
 private:
-    GLsizei build_vbo(const grbl::program& pgm);
+    GLsizei update_model_vbo(const grbl::program& pgm);
 
     GLuint spindle_vbo_id;
     GLuint spindle_vao_id;
@@ -30,16 +31,21 @@ private:
     GLuint extents_vbo_id;
     GLuint extents_vao_id;
 
+    GLuint heightmap_vbo_id;
+    GLuint heightmap_vao_id;
+
     shader_program *shader = nullptr;
+    shader_program *heightmap_shader = nullptr;
 
     bool initialized = false;
 
     glm::vec3 min_pos, max_pos, spindle_pos;
-    GLsizei vertices_count, spindle_vertices_count, extents_vertices_count;
+    GLsizei vertices_count, spindle_vertices_count, extents_vertices_count, heightmap_vertices_count;
 
     void initialize_program_buffers();
     void initialize_spindle_buffers();
     void initialize_extents_buffers();
+    void initialize_heightmap_buffers();
 };