💿🐜 Antkeeper source code
https://antkeeper.com
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198 lines
6.4 KiB
198 lines
6.4 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "render/passes/ground-pass.hpp"
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#include "resources/resource-manager.hpp"
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#include "resources/string-table.hpp"
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#include "gl/rasterizer.hpp"
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#include "gl/framebuffer.hpp"
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#include "gl/shader-program.hpp"
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#include "gl/shader-input.hpp"
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#include "gl/vertex-buffer.hpp"
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#include "gl/vertex-array.hpp"
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#include "gl/vertex-attribute.hpp"
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#include "gl/drawing-mode.hpp"
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#include "gl/texture-2d.hpp"
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#include "gl/texture-wrapping.hpp"
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#include "gl/texture-filter.hpp"
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#include "render/vertex-attribute.hpp"
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#include "render/context.hpp"
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#include "render/model.hpp"
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#include "render/material.hpp"
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#include "scene/camera.hpp"
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#include "scene/collection.hpp"
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#include "scene/directional-light.hpp"
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#include "scene/ambient-light.hpp"
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#include "utility/fundamental-types.hpp"
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#include "color/color.hpp"
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#include "math/interpolation.hpp"
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#include <cmath>
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#include <stdexcept>
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#include <glad/glad.h>
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namespace render {
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ground_pass::ground_pass(gl::rasterizer* rasterizer, const gl::framebuffer* framebuffer, resource_manager* resource_manager):
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pass(rasterizer, framebuffer),
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ground_model(nullptr),
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ground_model_vao(nullptr),
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ground_material(nullptr),
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shader_program(nullptr)
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{}
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ground_pass::~ground_pass()
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{}
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void ground_pass::render(const render::context& ctx, render::queue& queue) const
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{
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if (!ground_model)
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return;
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rasterizer->use_framebuffer(*framebuffer);
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glDisable(GL_BLEND);
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_ALWAYS);
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glDepthMask(GL_TRUE);
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glDepthRange(-1.0f, 1.0f);
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glEnable(GL_CULL_FACE);
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glCullFace(GL_BACK);
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glDisable(GL_STENCIL_TEST);
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glStencilMask(0);
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auto viewport = framebuffer->get_dimensions();
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rasterizer->set_viewport(0, 0, std::get<0>(viewport), std::get<1>(viewport));
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float2 resolution = {static_cast<float>(std::get<0>(viewport)), static_cast<float>(std::get<1>(viewport))};
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const scene::camera& camera = *ctx.camera;
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float clip_near = camera.get_clip_near_tween().interpolate(ctx.alpha);
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float clip_far = camera.get_clip_far_tween().interpolate(ctx.alpha);
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float3 model_scale = float3{1.0f, 1.0f, 1.0f} * (clip_near + clip_far) * 0.5f;
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float4x4 model = math::scale(math::identity4x4<float>, model_scale);
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float4x4 view = math::resize<4, 4>(math::resize<3, 3>(camera.get_view_tween().interpolate(ctx.alpha)));
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float4x4 model_view = view * model;
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float4x4 projection = camera.get_projection_tween().interpolate(ctx.alpha);
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float4x4 view_projection = camera.get_view_projection_tween().interpolate(ctx.alpha);
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float4x4 model_view_projection = projection * model_view;
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float3 ambient_light_color = {0.0f, 0.0f, 0.0f};
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float3 directional_light_color = {0.0f, 0.0f, 0.0f};
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float3 directional_light_direction = {0.0f, 0.0f, 0.0f};
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// Collect lights
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const std::list<scene::object_base*>* lights = ctx.collection->get_objects(scene::light::object_type_id);
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for (const scene::object_base* object: *lights)
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{
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// Skip inactive lights
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if (!object->is_active())
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continue;
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const scene::light* light = static_cast<const scene::light*>(object);
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switch (light->get_light_type())
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{
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// Add ambient light
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case scene::light_type::ambient:
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{
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// Pre-expose light
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ambient_light_color = light->get_scaled_color_tween().interpolate(ctx.alpha) * ctx.exposure;
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break;
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}
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// Add directional light
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case scene::light_type::directional:
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{
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const scene::directional_light* directional_light = static_cast<const scene::directional_light*>(light);
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// Pre-expose light
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directional_light_color = light->get_scaled_color_tween().interpolate(ctx.alpha) * ctx.exposure;
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directional_light_direction = static_cast<const scene::directional_light*>(light)->get_direction_tween().interpolate(ctx.alpha);
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break;
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}
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default:
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break;
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}
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}
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// Draw ground
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rasterizer->use_program(*shader_program);
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if (model_view_projection_input)
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model_view_projection_input->upload(model_view_projection);
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if (view_projection_input)
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view_projection_input->upload(view_projection);
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if (camera_position_input)
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camera_position_input->upload(ctx.camera_transform.translation);
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if (directional_light_colors_input)
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directional_light_colors_input->upload(0, &directional_light_color, 1);
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if (directional_light_directions_input)
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directional_light_directions_input->upload(0, &directional_light_direction, 1);
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if (ambient_light_colors_input)
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ambient_light_colors_input->upload(0, &ambient_light_color, 1);
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ground_material->upload(ctx.alpha);
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rasterizer->draw_arrays(*ground_model_vao, ground_model_drawing_mode, ground_model_start_index, ground_model_index_count);
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}
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void ground_pass::set_ground_model(const model* model)
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{
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ground_model = model;
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if (ground_model)
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{
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ground_model_vao = model->get_vertex_array();
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const std::vector<model_group*>& groups = *model->get_groups();
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for (model_group* group: groups)
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{
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ground_material = group->get_material();
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ground_model_drawing_mode = group->get_drawing_mode();
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ground_model_start_index = group->get_start_index();
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ground_model_index_count = group->get_index_count();
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}
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if (ground_material)
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{
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shader_program = ground_material->get_shader_program();
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if (shader_program)
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{
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model_view_projection_input = shader_program->get_input("model_view_projection");
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view_projection_input = shader_program->get_input("view_projection");
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camera_position_input = shader_program->get_input("camera.position");
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directional_light_colors_input = shader_program->get_input("directional_light_colors");
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directional_light_directions_input = shader_program->get_input("directional_light_directions");
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ambient_light_colors_input = shader_program->get_input("ambient_light_colors");
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}
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}
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}
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else
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{
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ground_model_vao = nullptr;
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}
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}
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} // namespace render
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