liblava/liblava-demo/triangle.cpp at flow · mcpplibs/liblava · GitHub

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/**
 * @file         liblava-demo/triangle.cpp
 * @brief        Triangle demo
 * @authors      Lava Block OÜ and contributors
 * @copyright    Copyright (c) 2018-present, MIT License
 */

#include "imgui.h"
#include "liblava/lava.hpp"

using namespace lava;

/**
 * @brief Vertex shader
 * Generate: glslangValidator -V -x -o res/triangle/vertex.u32 res/triangle/triangle.vert
 */
ui32 vert_shader[] = {
#include "res/triangle/vertex.u32"
};

/**
 * @brief Fragment shader
 * Generate: glslangValidator -V -x -o res/triangle/fragment.u32 res/triangle/triangle.frag
 */
ui32 frag_shader[] = {
#include "res/triangle/fragment.u32"
};

//-----------------------------------------------------------------------------
#ifdef LAVA_DEMO
LAVA_STAGE(1, "triangle") {
#else
int main(int argc, char* argv[]) {
    argh::parser argh(argc, argv);
#endif

    app app("lava triangle", argh);
    if (!app.setup())
        return error::not_ready;

    mesh::s_ptr triangle = create_mesh(app.device, mesh_type::triangle);
    if (!triangle)
        return error::create_failed;

    mesh_data& triangle_data = triangle->get_data();
    triangle_data.vertices.at(0).color = v4(1.f, 0.f, 0.f, 1.f);
    triangle_data.vertices.at(1).color = v4(0.f, 1.f, 0.f, 1.f);
    triangle_data.vertices.at(2).color = v4(0.f, 0.f, 1.f, 1.f);

    if (!triangle->reload())
        return error::create_failed;

    pipeline_layout::s_ptr layout;
    render_pipeline::s_ptr pipeline;

    app.on_create = [&]() {
        layout = pipeline_layout::make();
        if (!layout->create(app.device))
            return false;

        pipeline = render_pipeline::make(app.device, app.pipeline_cache);
        pipeline->set_layout(layout);

        if (!pipeline->add_shader({vert_shader, sizeof(vert_shader)},
                                  VK_SHADER_STAGE_VERTEX_BIT))
            return false;

        if (!pipeline->add_shader({frag_shader, sizeof(frag_shader)},
                                  VK_SHADER_STAGE_FRAGMENT_BIT))
            return false;

        pipeline->add_color_blend_attachment();

        pipeline->set_vertex_input_binding({0, sizeof(vertex), VK_VERTEX_INPUT_RATE_VERTEX});

        pipeline->set_vertex_input_attributes({
            {0, 0, VK_FORMAT_R32G32B32_SFLOAT, to_ui32(offsetof(vertex, position))},
            {1, 0, VK_FORMAT_R32G32B32A32_SFLOAT, to_ui32(offsetof(vertex, color))},
        });

        pipeline->on_process = [&](VkCommandBuffer cmd_buf) {
            triangle->bind_draw(cmd_buf);
        };

        render_pass::s_ptr render_pass = app.shading.get_pass();

        if (!pipeline->create(render_pass->get()))
            return false;

        render_pass->add_front(pipeline);

        return true;
    };

    app.on_destroy = [&]() {
        pipeline->destroy();
        layout->destroy();
    };

    app.imgui.layers.add("info", [&]() {
        ImGui::SetNextWindowPos({30, 30}, ImGuiCond_FirstUseEver);
        ImGui::SetNextWindowSize({260, 135}, ImGuiCond_FirstUseEver);

        ImGui::Begin(app.get_name());

        uv2 target_size = app.target->get_size();
        ImGui::Text("target: %d x %d", target_size.x, target_size.y);

        ImGui::SameLine();

        ImGui::Text("frames: %d", app.target->get_frame_count());

        app.draw_about();

        ImGui::End();
    });

    app.add_run_end([&]() {
        triangle->destroy();
    });

    return app.run();
}