render.h

/*
 * Copyright 2021 Adobe. All rights reserved.
 * This file is licensed to you under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
#pragma once
 
#include <lagrange/ui/api.h>
#include <lagrange/ui/components/GLMesh.h>
#include <lagrange/ui/components/VertexData.h>
#include <lagrange/ui/types/Camera.h>
#include <lagrange/ui/types/FrameBuffer.h>
#include <lagrange/ui/types/Shader.h>
#include <lagrange/ui/types/ShaderLoader.h>
#include <tuple>
 
 
namespace lagrange {
namespace ui {
 
class Material;
 
namespace utils {
namespace render {
 
LA_UI_API Eigen::Matrix4f offset_depth(const Eigen::Projective3f& perspective, int layer_index);
 
 
LA_UI_API void set_render_pass_defaults(GLScope& scope);
 
 
LA_UI_API std::pair<Eigen::Vector3f, Eigen::Vector3f> compute_perpendicular_plane(
    Eigen::Vector3f direction);
 
 
} // namespace render
 
 
} // namespace utils
 
 
//==============================================================
/*
    New rendering system pipeline utils
*/
//==============================================================
struct Transform;
 
/*
    Sets shader uniforms (PV, PVinv, M, NMat, screen_size) based on camera and optional transform
    Adjusts viewport glViewport if transform contains viewport transform
*/
LA_UI_API void set_render_transforms(
    GLScope& scope,
    Shader& shader,
    const Camera& camera,
    const Transform* transform = nullptr);
 
 
LA_UI_API void render_vertex_data(const VertexData& vd, GLenum primitive, GLsizei per_element_size);
 
LA_UI_API GLenum get_gl_primitive(const PrimitiveType& p);
 
LA_UI_API GLsizei get_gl_primitive_size(const PrimitiveType& p);
LA_UI_API GLsizei get_gl_primitive_size(GLenum primitive_enum);
 
 
LA_UI_API std::shared_ptr<VertexData> generate_cube_vertex_data(bool edges = false);
LA_UI_API std::shared_ptr<VertexData> generate_quad_vertex_data();
 
LA_UI_API GLMesh generate_quad_mesh_gpu();
 
 
LA_UI_API void update_vao(VertexData& vertex_data);
 
 
LA_UI_API entt::resource<Shader>
get_or_load_shader(ShaderCache& cache, const std::string& generic_path, bool virtual_fs = false);
 
 
template <typename BufferComponent>
bool set_mesh_geometry_layout(
    const Registry& registry,
    const Entity mesh_geometry_entity,
    const int& location,
    VertexData& vertex_data)
{
    const auto* buffer_component = registry.try_get<BufferComponent>(mesh_geometry_entity);
 
    vertex_data.attribute_dimensions[location] = BufferComponent::dimension;
 
    if (buffer_component && buffer_component->buffer) {
        vertex_data.attribute_buffers[location] = buffer_component->buffer;
        return true;
    } else {
        vertex_data.attribute_buffers[location] = nullptr;
        return false;
    }
}
 
LA_UI_API int get_gl_attribute_dimension(GLenum attrib_type);
 
LA_UI_API void update_vertex_data(
    const GLMesh& glmesh,
    const Shader& shader,
    VertexData& glvd,
    IndexingMode indexing,
    entt::id_type submesh_index);
 
} // namespace ui
} // namespace lagrange