Demos: Create demo for VirGL gpu device

This is a simple demo for VirGL, that does the bare minimum required to
create and render a spinning cube (with one color per face).

8 files changed, 957 insertions, 0 deletions

diff --git a/Userland/Demos/CMakeLists.txt b/Userland/Demos/CMakeLists.txt
index f75aa4adc7..cb9b1e2f00 100644
--- a/Userland/Demos/CMakeLists.txt
+++ b/Userland/Demos/CMakeLists.txt
@@ -9,4 +9,5 @@ add_subdirectory(ModelGallery)
 add_subdirectory(Mouse)
 add_subdirectory(Screensaver)
 add_subdirectory(Starfield)
+add_subdirectory(VirGLDemo)
 add_subdirectory(WidgetGallery)
diff --git a/Userland/Demos/VirGLDemo/CMakeLists.txt b/Userland/Demos/VirGLDemo/CMakeLists.txt
new file mode 100644
index 0000000000..8b11dec1a8
--- /dev/null
+++ b/Userland/Demos/VirGLDemo/CMakeLists.txt
@@ -0,0 +1,13 @@
+serenity_component(
+    VirGLDemo
+    TARGETS VirGLDemo
+)
+
+set(SOURCES
+    CommandBufferBuilder.cpp
+    VirGLDemo.cpp
+    Widget.cpp
+)
+
+serenity_app(VirGLDemo ICON app-cube)
+target_link_libraries(VirGLDemo LibMain LibGUI)
diff --git a/Userland/Demos/VirGLDemo/CommandBufferBuilder.cpp b/Userland/Demos/VirGLDemo/CommandBufferBuilder.cpp
new file mode 100644
index 0000000000..8d7b8627db
--- /dev/null
+++ b/Userland/Demos/VirGLDemo/CommandBufferBuilder.cpp
@@ -0,0 +1,291 @@
+/*
+ * Copyright (c) 2022, Sahan Fernando <sahan.h.fernando@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/API/VirGL.h>
+#include <sys/ioctl_numbers.h>
+
+#include "CommandBufferBuilder.h"
+#include "VirGLProtocol.h"
+#include "Widget.h"
+
+static u32 encode_command(u32 length, u32 mid, Protocol::VirGLCommand command)
+{
+    u32 command_value = to_underlying(command);
+    return (length << 16) | ((mid & 0xff) << 8) | (command_value & 0xff);
+};
+
+class CommandBuilder {
+public:
+    CommandBuilder() = delete;
+    CommandBuilder(Vector<u32>& buffer, Protocol::VirGLCommand command, u32 mid)
+        : m_buffer(buffer)
+        , m_start_offset(buffer.size())
+        , m_command(command)
+        , m_command_mid(mid)
+    {
+        m_buffer.append(0);
+    }
+    void appendu32(u32 value)
+    {
+        VERIFY(!m_finalized);
+        m_buffer.append(value);
+    }
+    void appendf32(float value)
+    {
+        VERIFY(!m_finalized);
+        m_buffer.append(bit_cast<u32>(value));
+    }
+    void appendf64(double value)
+    {
+        VERIFY(!m_finalized);
+        m_buffer.append(0);
+        m_buffer.append(0);
+        auto* depth = (u64*)(&m_buffer[m_buffer.size() - 2]);
+        *depth = bit_cast<u64>(value);
+    }
+    void append_string_null_padded(StringView string)
+    {
+        VERIFY(!m_finalized);
+        // Remember to have at least one null terminator byte
+        auto length = string.length() + 1;
+        auto num_required_words = (length + sizeof(u32) - 1) / sizeof(u32);
+        m_buffer.resize(m_buffer.size() + num_required_words);
+        char* dest = (char*)&m_buffer[m_buffer.size() - num_required_words];
+        memcpy(dest, string.characters_without_null_termination(), string.length());
+        // Pad end with null bytes
+        memset(&dest[string.length()], 0, 4 * num_required_words - string.length());
+    }
+    void finalize()
+    {
+        if (!m_finalized) {
+            m_finalized = true;
+            size_t num_elems = m_buffer.size() - m_start_offset - 1;
+            m_buffer[m_start_offset] = encode_command(num_elems, m_command_mid, m_command);
+        }
+    }
+    ~CommandBuilder()
+    {
+        if (!m_finalized)
+            finalize();
+    }
+
+private:
+    Vector<u32>& m_buffer;
+    size_t m_start_offset;
+    Protocol::VirGLCommand m_command;
+    u32 m_command_mid;
+    bool m_finalized { false };
+};
+
+void CommandBufferBuilder::append_set_tweaks(u32 id, u32 value)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::SET_TWEAKS, 0);
+    builder.appendu32(id);
+    builder.appendu32(value);
+}
+
+void CommandBufferBuilder::append_transfer3d(ResourceID resource, size_t width, size_t height, size_t depth, size_t direction)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::TRANSFER3D, 0);
+    builder.appendu32(resource.value()); // res_handle
+    builder.appendu32(0);                // level
+    builder.appendu32(242);              // usage
+    builder.appendu32(0);                // stride
+    builder.appendu32(0);                // layer_stride
+    builder.appendu32(0);                // x
+    builder.appendu32(0);                // y
+    builder.appendu32(0);                // z
+    builder.appendu32(width);            // width
+    builder.appendu32(height);           // height
+    builder.appendu32(depth);            // depth
+    builder.appendu32(0);                // data_offset
+    builder.appendu32(direction);        // direction
+}
+
+void CommandBufferBuilder::append_end_transfers_3d()
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::END_TRANSFERS, 0);
+}
+
+void CommandBufferBuilder::append_draw_vbo(u32 count)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::DRAW_VBO, 0);
+    builder.appendu32(0);                                                      // start
+    builder.appendu32(count);                                                  // count
+    builder.appendu32(to_underlying(Protocol::PipePrimitiveTypes::TRIANGLES)); // mode
+    builder.appendu32(0);                                                      // indexed
+    builder.appendu32(1);                                                      // instance_count
+    builder.appendu32(0);                                                      // index_bias
+    builder.appendu32(0);                                                      // start_instance
+    builder.appendu32(0);                                                      // primitive_restart
+    builder.appendu32(0);                                                      // restart_index
+    builder.appendu32(0);                                                      // min_index
+    builder.appendu32(0xffffffff);                                             // max_index
+    builder.appendu32(0);                                                      // cso
+}
+
+void CommandBufferBuilder::append_gl_clear(float r, float g, float b)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::CLEAR, 0);
+    Protocol::ClearType clear_flags {};
+    clear_flags.flags.depth = 1;
+    clear_flags.flags.color0 = 1;
+    builder.appendu32(clear_flags.value);
+    builder.appendf32(r);
+    builder.appendf32(g);
+    builder.appendf32(b);
+    builder.appendf32(1.0f); // Alpha
+    builder.appendf64(1.0);  // Depth
+    builder.appendu32(0);    // Stencil
+}
+
+void CommandBufferBuilder::append_set_vertex_buffers(u32 stride, u32 offset, ResourceID resource)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::SET_VERTEX_BUFFERS, 0);
+    builder.appendu32(stride);
+    builder.appendu32(offset);
+    builder.appendu32(resource.value());
+}
+
+void CommandBufferBuilder::append_create_blend(ObjectHandle handle)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::CREATE_OBJECT, to_underlying(Protocol::ObjectType::BLEND));
+    builder.appendu32(handle.value());
+    builder.appendu32(4); // Enable dither flag, and nothing else
+    builder.appendu32(0);
+    builder.appendu32(0x78000000); // Enable all bits of color mask for color buffer 0, and nothing else
+    for (size_t i = 1; i < 8; ++i) {
+        builder.appendu32(0); // Explicitly disable all flags for other color buffers
+    }
+}
+
+void CommandBufferBuilder::append_bind_blend(ObjectHandle handle)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::BIND_OBJECT, to_underlying(Protocol::ObjectType::BLEND));
+    builder.appendu32(handle.value()); // VIRGL_OBJ_BIND_HANDLE
+}
+
+void CommandBufferBuilder::append_create_vertex_elements(ObjectHandle handle)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::CREATE_OBJECT, to_underlying(Protocol::ObjectType::VERTEX_ELEMENTS));
+    builder.appendu32(handle.value());
+    builder.appendu32(12); // src_offset_0
+    builder.appendu32(0);  // instance_divisor_0
+    builder.appendu32(0);  // vertex_buffer_index_0
+    builder.appendu32(30); // src_format_0 (PIPE_FORMAT_R32G32B32_FLOAT = 30)
+    builder.appendu32(0);  // src_offset_1
+    builder.appendu32(0);  // instance_divisor_1
+    builder.appendu32(0);  // vertex_buffer_index_1
+    builder.appendu32(30); // src_format_1 (PIPE_FORMAT_R32G32B32_FLOAT = 30)
+}
+
+void CommandBufferBuilder::append_bind_vertex_elements(ObjectHandle handle)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::BIND_OBJECT, to_underlying(Protocol::ObjectType::VERTEX_ELEMENTS));
+    builder.appendu32(handle.value()); // VIRGL_OBJ_BIND_HANDLE
+}
+
+void CommandBufferBuilder::append_create_surface(ResourceID drawtarget_resource, ObjectHandle drawtarget_handle, Protocol::TextureFormat format)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::CREATE_OBJECT, to_underlying(Protocol::ObjectType::SURFACE));
+    builder.appendu32(drawtarget_handle.value());
+    builder.appendu32(drawtarget_resource.value());
+    builder.appendu32(to_underlying(format));
+    builder.appendu32(0); // First element / Texture Level
+    builder.appendu32(0); // Last element / Texture Element
+}
+
+void CommandBufferBuilder::append_set_framebuffer_state(ObjectHandle drawtarget, ObjectHandle depthbuffer)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::SET_FRAMEBUFFER_STATE, 0);
+    builder.appendu32(1);                   // nr_cbufs
+    builder.appendu32(depthbuffer.value()); // zsurf_handle
+    builder.appendu32(drawtarget.value());  // surf_handle
+}
+
+void CommandBufferBuilder::append_gl_viewport()
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::SET_VIEWPORT_STATE, 0);
+    builder.appendu32(0);
+    builder.appendf32(DRAWTARGET_WIDTH / 2);    // scale_x
+    builder.appendf32((DRAWTARGET_HEIGHT / 2)); // scale_y (flipped, due to VirGL being different from our coordinate space)
+    builder.appendf32(0.5f);                    // scale_z
+    builder.appendf32(DRAWTARGET_WIDTH / 2);    // translate_x
+    builder.appendf32(DRAWTARGET_HEIGHT / 2);   // translate_y
+    builder.appendf32(0.5f);                    // translate_z
+}
+
+void CommandBufferBuilder::append_set_framebuffer_state_no_attach()
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::SET_FRAMEBUFFER_STATE_NO_ATTACH, 0);
+    builder.appendu32((DRAWTARGET_HEIGHT << 16) | DRAWTARGET_WIDTH); // (height << 16) | width
+    builder.appendu32(0);                                            // (samples << 16) | layers
+}
+
+void CommandBufferBuilder::append_set_constant_buffer(Vector<float> const& constant_buffer)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::SET_CONSTANT_BUFFER, 0);
+    builder.appendu32(to_underlying(Gallium::ShaderType::SHADER_VERTEX));
+    builder.appendu32(0); // index (currently unused according to virglrenderer source code)
+    for (auto v : constant_buffer) {
+        builder.appendf32(v);
+    }
+}
+
+void CommandBufferBuilder::append_create_shader(ObjectHandle handle, Gallium::ShaderType shader_type, const char* shader_data)
+{
+    size_t shader_len = strlen(shader_data) + 1; // Need to remember to copy null terminator as well if needed
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::CREATE_OBJECT, to_underlying(Protocol::ObjectType::SHADER));
+    builder.appendu32(handle.value()); // VIRGL_OBJ_CREATE_HANDLE
+    builder.appendu32(to_underlying(shader_type));
+    builder.appendu32(0); // VIRGL_OBJ_SHADER_OFFSET
+    builder.appendu32(shader_len);
+    builder.appendu32(0); // VIRGL_OBJ_SHADER_NUM_TOKENS
+    builder.append_string_null_padded(shader_data);
+}
+
+void CommandBufferBuilder::append_bind_shader(ObjectHandle handle, Gallium::ShaderType shader_type)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::BIND_SHADER, 0);
+    builder.appendu32(handle.value()); // VIRGL_OBJ_BIND_HANDLE
+    builder.appendu32(to_underlying(shader_type));
+}
+
+void CommandBufferBuilder::append_create_rasterizer(ObjectHandle handle)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::CREATE_OBJECT, to_underlying(Protocol::ObjectType::RASTERIZER));
+    builder.appendu32(handle.value()); // Handle
+    builder.appendu32(0x00000002);     // S0 (bitfield of state bits)
+    builder.appendf32(1.0);            // Point size
+    builder.appendu32(0);              // Sprite coord enable
+    builder.appendu32(0x00000000);     // S3 (bitfield of state bits)
+    builder.appendf32(0.1);            // Line width
+    builder.appendf32(0.0);            // Offset units
+    builder.appendf32(0.0);            // offset scale
+    builder.appendf32(0.0);            // Offset clamp
+}
+
+void CommandBufferBuilder::append_bind_rasterizer(ObjectHandle handle)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::BIND_OBJECT, to_underlying(Protocol::ObjectType::RASTERIZER));
+    builder.appendu32(handle.value()); // VIRGL_OBJ_BIND_HANDLE
+}
+
+void CommandBufferBuilder::append_create_dsa(ObjectHandle handle)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::CREATE_OBJECT, to_underlying(Protocol::ObjectType::DSA));
+    builder.appendu32(handle.value()); // Handle
+    builder.appendu32(0x00000007);     // S0 (bitset: (v >> 0) & 1 = depth.enabled, (v >> 1) & 1 = depth.writemask,  (v >> 2) & 7 = depth.func)
+    builder.appendu32(0x00000000);     // S1 (bitset for 1st stencil buffer)
+    builder.appendu32(0x00000000);     // S2 (bitset for 2nd stencil buffer)
+    builder.appendf32(1.0);            // Alpha Ref
+}
+
+void CommandBufferBuilder::append_bind_dsa(ObjectHandle handle)
+{
+    CommandBuilder builder(m_buffer, Protocol::VirGLCommand::BIND_OBJECT, to_underlying(Protocol::ObjectType::DSA));
+    builder.appendu32(handle.value()); // VIRGL_OBJ_BIND_HANDLE
+}
diff --git a/Userland/Demos/VirGLDemo/CommandBufferBuilder.h b/Userland/Demos/VirGLDemo/CommandBufferBuilder.h
new file mode 100644
index 0000000000..8be91f9f35
--- /dev/null
+++ b/Userland/Demos/VirGLDemo/CommandBufferBuilder.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2022, Sahan Fernando <sahan.h.fernando@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Vector.h>
+#include <sys/ioctl_numbers.h>
+
+#include "VirGLProtocol.h"
+
+class CommandBufferBuilder {
+public:
+    void append_set_tweaks(u32 id, u32 value);
+    void append_transfer3d(ResourceID resource, size_t width, size_t height = 1, size_t depth = 1, size_t direction = VIRGL_DATA_DIR_GUEST_TO_HOST);
+    void append_end_transfers_3d();
+    void append_draw_vbo(u32 count);
+    void append_gl_clear(float r, float g, float b);
+    void append_set_vertex_buffers(u32 stride, u32 offset, ResourceID resource);
+    void append_create_blend(ObjectHandle handle);
+    void append_bind_blend(ObjectHandle handle);
+    void append_create_surface(ResourceID drawtarget_resource, ObjectHandle drawtarget_handle, Protocol::TextureFormat format);
+    void append_set_framebuffer_state(ObjectHandle drawtarget, ObjectHandle depthbuffer = 0);
+    void append_create_vertex_elements(ObjectHandle handle);
+    void append_bind_vertex_elements(ObjectHandle handle);
+    void append_gl_viewport();
+    void append_set_framebuffer_state_no_attach();
+    void append_set_constant_buffer(Vector<float> const& constant_buffer);
+    void append_create_shader(ObjectHandle handle, Gallium::ShaderType shader_type, const char* shader_data);
+    void append_bind_shader(ObjectHandle handle, Gallium::ShaderType shader_type);
+    void append_create_rasterizer(ObjectHandle handle);
+    void append_bind_rasterizer(ObjectHandle handle);
+    void append_create_dsa(ObjectHandle handle);
+    void append_bind_dsa(ObjectHandle handle);
+    Vector<u32> const& build() { return m_buffer; }
+
+private:
+    Vector<u32> m_buffer;
+};
diff --git a/Userland/Demos/VirGLDemo/VirGLDemo.cpp b/Userland/Demos/VirGLDemo/VirGLDemo.cpp
new file mode 100644
index 0000000000..f3763a54e1
--- /dev/null
+++ b/Userland/Demos/VirGLDemo/VirGLDemo.cpp
@@ -0,0 +1,323 @@
+/*
+ * Copyright (c) 2022, Sahan Fernando <sahan.h.fernando@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/String.h>
+#include <AK/Vector.h>
+#include <Kernel/API/VirGL.h>
+#include <LibGUI/Application.h>
+#include <LibGUI/Icon.h>
+#include <LibGUI/Window.h>
+#include <LibGfx/Matrix4x4.h>
+#include <LibMain/Main.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sys/ioctl_numbers.h>
+#include <unistd.h>
+
+#include "CommandBufferBuilder.h"
+#include "VirGLProtocol.h"
+#include "Widget.h"
+
+static const char* frag_shader = "FRAG\n"
+                                 "PROPERTY FS_COLOR0_WRITES_ALL_CBUFS 1\n"
+                                 "DCL IN[0], COLOR, COLOR\n"
+                                 "DCL OUT[0], COLOR\n"
+                                 "  0: MOV OUT[0], IN[0]\n"
+                                 "  1: END\n";
+
+static const char* vert_shader = "VERT\n"
+                                 "DCL IN[0]\n"
+                                 "DCL IN[1]\n"
+                                 "DCL OUT[0], POSITION\n"
+                                 "DCL OUT[1], COLOR\n"
+                                 "DCL CONST[0..3]\n"
+                                 "DCL TEMP[0..1]\n"
+                                 "  0: MUL TEMP[0], IN[0].xxxx, CONST[0]\n"
+                                 "  1: MAD TEMP[1], IN[0].yyyy, CONST[1], TEMP[0]\n"
+                                 "  2: MAD TEMP[0], IN[0].zzzz, CONST[2], TEMP[1]\n"
+                                 "  3: MAD OUT[0], IN[0].wwww, CONST[3], TEMP[0]\n"
+                                 "  4: MOV_SAT OUT[1], IN[1]\n"
+                                 "  5: END\n";
+
+struct VertexData {
+    float r;
+    float g;
+    float b;
+    float x;
+    float y;
+    float z;
+};
+
+int gpu_fd;
+ResourceID vbo_resource_id;
+ResourceID drawtarget;
+ResourceID depthbuffer_surface;
+ObjectHandle blend_handle;
+ObjectHandle drawtarget_surface_handle;
+ObjectHandle depthbuffer_surface_handle;
+ObjectHandle ve_handle;
+ObjectHandle frag_shader_handle;
+ObjectHandle vert_shader_handle;
+ObjectHandle rasterizer_handle;
+ObjectHandle dsa_handle;
+Vector<VertexData> g_vertices;
+
+static ObjectHandle allocate_handle()
+{
+    static u32 last_allocated_handle = 0;
+    return { ++last_allocated_handle };
+}
+
+static void upload_command_buffer(Vector<u32> const& command_buffer)
+{
+    VERIFY(command_buffer.size() <= NumericLimits<u32>::max());
+    VirGLCommandBuffer command_buffer_descriptor {
+        .data = command_buffer.data(),
+        .num_elems = (u32)command_buffer.size(),
+    };
+    VERIFY(ioctl(gpu_fd, VIRGL_IOCTL_SUBMIT_CMD, &command_buffer_descriptor) >= 0);
+}
+
+static ResourceID create_virgl_resource(VirGL3DResourceSpec& spec)
+{
+    VERIFY(ioctl(gpu_fd, VIRGL_IOCTL_CREATE_RESOURCE, &spec) >= 0);
+    return spec.created_resource_id;
+}
+
+static Vector<VertexData> gen_vertex_data()
+{
+    Vector<VertexData> data;
+    static const VertexData vertices[8] = {
+        VertexData { .r = 0, .g = 0, .b = 0, .x = -0.5, .y = -0.5, .z = -0.5 },
+        VertexData { .r = 0, .g = 0, .b = 0, .x = 0.5, .y = -0.5, .z = -0.5 },
+        VertexData { .r = 0, .g = 0, .b = 0, .x = -0.5, .y = 0.5, .z = -0.5 },
+        VertexData { .r = 0, .g = 0, .b = 0, .x = 0.5, .y = 0.5, .z = -0.5 },
+        VertexData { .r = 0, .g = 0, .b = 0, .x = -0.5, .y = -0.5, .z = 0.5 },
+        VertexData { .r = 0, .g = 0, .b = 0, .x = 0.5, .y = -0.5, .z = 0.5 },
+        VertexData { .r = 0, .g = 0, .b = 0, .x = -0.5, .y = 0.5, .z = 0.5 },
+        VertexData { .r = 0, .g = 0, .b = 0, .x = 0.5, .y = 0.5, .z = 0.5 },
+    };
+    size_t tris[36] = {
+        0, 1, 2, 1, 3, 2, // Top
+        4, 0, 6, 0, 2, 6, // Left
+        4, 5, 0, 5, 1, 0, // Up
+        1, 5, 3, 5, 7, 3, // Right
+        2, 3, 6, 3, 7, 6, // Down
+        5, 4, 7, 4, 6, 7, // Bottom
+    };
+    for (auto index : tris) {
+        data.append(vertices[index]);
+    }
+    // Choose random colors for each face of the cube
+    for (auto i = 0; i < 6; ++i) {
+        float red = (rand() % 256) / 255.f;
+        float green = (rand() % 256) / 255.f;
+        float blue = (rand() % 256) / 255.f;
+        for (auto j = 0; j < 6; ++j) {
+            auto& vertex = data[i * 6 + j];
+            vertex.r = red;
+            vertex.g = green;
+            vertex.b = blue;
+        }
+    }
+    return data;
+}
+
+static void init()
+{
+    // Open the device
+    gpu_fd = open("/dev/gpu0", O_RDWR);
+    VERIFY(gpu_fd >= 0);
+    // Create a VertexElements resource
+    VirGL3DResourceSpec vbo_spec {
+        .target = to_underlying(Gallium::PipeTextureTarget::BUFFER), // pipe_texture_target
+        .format = 45,                                                // pipe_to_virgl_format
+        .bind = VIRGL_BIND_VERTEX_BUFFER,
+        .width = PAGE_SIZE,
+        .height = 1,
+        .depth = 1,
+        .array_size = 1,
+        .last_level = 0,
+        .nr_samples = 0,
+        .flags = 0,
+        .created_resource_id = 0,
+    };
+    vbo_resource_id = create_virgl_resource(vbo_spec);
+    // Create a texture to draw to
+    VirGL3DResourceSpec drawtarget_spec {
+        .target = to_underlying(Gallium::PipeTextureTarget::TEXTURE_RECT),                  // pipe_texture_target
+        .format = to_underlying(Protocol::TextureFormat::VIRTIO_GPU_FORMAT_B8G8R8A8_UNORM), // pipe_to_virgl_format
+        .bind = VIRGL_BIND_RENDER_TARGET,
+        .width = DRAWTARGET_WIDTH,
+        .height = DRAWTARGET_HEIGHT,
+        .depth = 1,
+        .array_size = 1,
+        .last_level = 0,
+        .nr_samples = 0,
+        .flags = 0,
+        .created_resource_id = 0,
+    };
+    drawtarget = create_virgl_resource(drawtarget_spec);
+    // Create a depthbuffer surface
+    VirGL3DResourceSpec depthbuffer_surface_spec {
+        .target = to_underlying(Gallium::PipeTextureTarget::TEXTURE_RECT),             // pipe_texture_target
+        .format = to_underlying(Protocol::TextureFormat::VIRTIO_GPU_FORMAT_Z32_FLOAT), // pipe_to_virgl_format
+        .bind = VIRGL_BIND_RENDER_TARGET | VIRGL_BIND_DEPTH_STENCIL,
+        .width = DRAWTARGET_WIDTH,
+        .height = DRAWTARGET_HEIGHT,
+        .depth = 1,
+        .array_size = 1,
+        .last_level = 0,
+        .nr_samples = 0,
+        .flags = 0,
+        .created_resource_id = 0,
+    };
+    depthbuffer_surface = create_virgl_resource(depthbuffer_surface_spec);
+
+    // Initialize all required state
+    CommandBufferBuilder builder;
+    // Create and set the blend, to control the color mask
+    blend_handle = allocate_handle();
+    builder.append_create_blend(blend_handle);
+    builder.append_bind_blend(blend_handle);
+    // Create drawtarget surface
+    drawtarget_surface_handle = allocate_handle();
+    builder.append_create_surface(drawtarget, drawtarget_surface_handle, Protocol::TextureFormat::VIRTIO_GPU_FORMAT_B8G8R8A8_UNORM);
+    // Create depthbuffer surface
+    depthbuffer_surface_handle = allocate_handle();
+    builder.append_create_surface(depthbuffer_surface, depthbuffer_surface_handle, Protocol::TextureFormat::VIRTIO_GPU_FORMAT_Z32_FLOAT);
+    // Set some framebuffer state (attached handle, framebuffer size, etc)
+    builder.append_set_framebuffer_state(drawtarget_surface_handle, depthbuffer_surface_handle);
+    builder.append_set_framebuffer_state_no_attach();
+    // Set the vertex buffer
+    builder.append_set_vertex_buffers(sizeof(VertexData), 0, vbo_resource_id);
+    // Create and bind fragment shader
+    frag_shader_handle = allocate_handle();
+    builder.append_create_shader(frag_shader_handle, Gallium::ShaderType::SHADER_FRAGMENT, frag_shader);
+    builder.append_bind_shader(frag_shader_handle, Gallium::ShaderType::SHADER_FRAGMENT);
+    // Create and bind vertex shader
+    vert_shader_handle = allocate_handle();
+    builder.append_create_shader(vert_shader_handle, Gallium::ShaderType::SHADER_VERTEX, vert_shader);
+    builder.append_bind_shader(vert_shader_handle, Gallium::ShaderType::SHADER_VERTEX);
+    // Create a VertexElements object (used to specify layout of vertex data)
+    ve_handle = allocate_handle();
+    builder.append_create_vertex_elements(ve_handle);
+    builder.append_bind_vertex_elements(ve_handle);
+    // Create a DepthStencilAlpha (DSA) object
+    dsa_handle = allocate_handle();
+    builder.append_create_dsa(dsa_handle);
+    builder.append_bind_dsa(dsa_handle);
+    // Create a Rasterizer object
+    rasterizer_handle = allocate_handle();
+    builder.append_create_rasterizer(rasterizer_handle);
+    builder.append_bind_rasterizer(rasterizer_handle);
+    // Set the Viewport
+    builder.append_gl_viewport();
+    // Upload buffer
+    upload_command_buffer(builder.build());
+
+    // Setup the vertex data
+    g_vertices = gen_vertex_data();
+}
+
+static Gfx::FloatMatrix4x4 get_transform_matrix(unsigned step_num)
+{
+    auto mat = Gfx::FloatMatrix4x4::identity();
+    float angle = step_num * 0.02;
+    mat = mat * Gfx::rotation_matrix(FloatVector3(1, 0, 0), angle * 1.17356641f);
+    mat = mat * Gfx::rotation_matrix(FloatVector3(0, 1, 0), angle * 0.90533273f);
+    mat = mat * Gfx::rotation_matrix(FloatVector3(0, 0, 1), angle);
+    return mat;
+}
+
+static Vector<float> encode_constant_buffer(Gfx::FloatMatrix4x4 const& mat)
+{
+    // Flip the y axis. This is done because OpenGLs coordinate space has a Y-axis of
+    // Opposite direction to that of LibGfx
+    Gfx::FloatMatrix4x4 flip_y = Gfx::FloatMatrix4x4::identity();
+    flip_y.elements()[1][1] = -1;
+    auto real_mat = mat * flip_y;
+    Vector<float> values;
+    for (int i = 0; i < 4; ++i) {
+        for (int j = 0; j < 4; ++j) {
+            values.append(real_mat.elements()[i][j]);
+        }
+    }
+    return values;
+}
+
+static void draw_frame(unsigned step_num)
+{
+    // Get model matrix
+    auto model_matrix = get_transform_matrix(step_num);
+    VirGLTransferDescriptor descriptor {
+        .data = (void*)g_vertices.data(),
+        .offset_in_region = 0,
+        .num_bytes = sizeof(VertexData) * g_vertices.size(),
+        .direction = VIRGL_DATA_DIR_GUEST_TO_HOST,
+    };
+    // Transfer data from vertices array to kernel virgl transfer region
+    VERIFY(ioctl(gpu_fd, VIRGL_IOCTL_TRANSFER_DATA, &descriptor) >= 0);
+    // Create command buffer
+    CommandBufferBuilder builder;
+    // Transfer data from kernel virgl transfer region to host resource
+    builder.append_transfer3d(vbo_resource_id, sizeof(VertexData) * g_vertices.size(), 1, 1, VIRGL_DATA_DIR_GUEST_TO_HOST);
+    builder.append_end_transfers_3d();
+    // Set the constant buffer to the identity matrix
+    builder.append_set_constant_buffer(encode_constant_buffer(model_matrix));
+    // Clear the framebuffer
+    builder.append_gl_clear(0, 0, 0);
+    // Draw the vbo
+    builder.append_draw_vbo(g_vertices.size());
+    // Upload the buffer
+    upload_command_buffer(builder.build());
+}
+
+void update_frame(RefPtr<Gfx::Bitmap> target, unsigned num_cycles)
+{
+    VERIFY(target->width() == DRAWTARGET_WIDTH);
+    VERIFY(target->height() == DRAWTARGET_HEIGHT);
+    // Run logic to draw the frame
+    draw_frame(num_cycles);
+    // Transfer data back from hypervisor to kernel transfer region
+    CommandBufferBuilder builder;
+    builder.append_transfer3d(drawtarget, DRAWTARGET_WIDTH, DRAWTARGET_HEIGHT, 1, VIRGL_DATA_DIR_HOST_TO_GUEST);
+    builder.append_end_transfers_3d();
+    upload_command_buffer(builder.build());
+    // Copy from kernel transfer region to userspace
+    VirGLTransferDescriptor descriptor {
+        .data = (void*)target->scanline_u8(0),
+        .offset_in_region = 0,
+        .num_bytes = DRAWTARGET_WIDTH * DRAWTARGET_HEIGHT * sizeof(u32),
+        .direction = VIRGL_DATA_DIR_HOST_TO_GUEST,
+    };
+    VERIFY(ioctl(gpu_fd, VIRGL_IOCTL_TRANSFER_DATA, &descriptor) >= 0);
+}
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    auto app = TRY(GUI::Application::try_create(arguments));
+
+    auto window = TRY(GUI::Window::try_create());
+    window->set_double_buffering_enabled(true);
+    window->set_title("VirGLDemo");
+    window->set_resizable(false);
+    window->resize(DRAWTARGET_WIDTH, DRAWTARGET_HEIGHT);
+    window->set_has_alpha_channel(false);
+    window->set_alpha_hit_threshold(1);
+
+    auto demo = TRY(window->try_set_main_widget<Demo>());
+
+    auto app_icon = GUI::Icon::default_icon("app-cube");
+    window->set_icon(app_icon.bitmap_for_size(16));
+
+    init();
+    window->show();
+
+    return app->exec();
+}
diff --git a/Userland/Demos/VirGLDemo/VirGLProtocol.h b/Userland/Demos/VirGLDemo/VirGLProtocol.h
new file mode 100644
index 0000000000..21d9da96bc
--- /dev/null
+++ b/Userland/Demos/VirGLDemo/VirGLProtocol.h
@@ -0,0 +1,210 @@
+/*
+ * Copyright (c) 2022, Sahan Fernando <sahan.h.fernando@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/DistinctNumeric.h>
+
+TYPEDEF_DISTINCT_ORDERED_ID(u32, ObjectHandle);
+TYPEDEF_DISTINCT_ORDERED_ID(u32, ResourceID);
+
+#define VIRGL_BIND_DEPTH_STENCIL (1 << 0)
+#define VIRGL_BIND_RENDER_TARGET (1 << 1)
+#define VIRGL_BIND_SAMPLER_VIEW (1 << 3)
+#define VIRGL_BIND_VERTEX_BUFFER (1 << 4)
+#define VIRGL_BIND_INDEX_BUFFER (1 << 5)
+#define VIRGL_BIND_CONSTANT_BUFFER (1 << 6)
+#define VIRGL_BIND_DISPLAY_TARGET (1 << 7)
+#define VIRGL_BIND_COMMAND_ARGS (1 << 8)
+#define VIRGL_BIND_STREAM_OUTPUT (1 << 11)
+#define VIRGL_BIND_SHADER_BUFFER (1 << 14)
+#define VIRGL_BIND_QUERY_BUFFER (1 << 15)
+#define VIRGL_BIND_CURSOR (1 << 16)
+#define VIRGL_BIND_CUSTOM (1 << 17)
+#define VIRGL_BIND_SCANOUT (1 << 18)
+#define VIRGL_BIND_STAGING (1 << 19)
+#define VIRGL_BIND_SHARED (1 << 20)
+
+namespace Protocol {
+
+enum class TextureFormat : u32 {
+    // RGBA Formats
+    VIRTIO_GPU_FORMAT_B8G8R8A8_UNORM = 1,
+    VIRTIO_GPU_FORMAT_B8G8R8X8_UNORM = 2,
+    VIRTIO_GPU_FORMAT_A8R8G8B8_UNORM = 3,
+    VIRTIO_GPU_FORMAT_X8R8G8B8_UNORM = 4,
+
+    VIRTIO_GPU_FORMAT_R8G8B8A8_UNORM = 67,
+    VIRTIO_GPU_FORMAT_X8B8G8R8_UNORM = 68,
+
+    VIRTIO_GPU_FORMAT_A8B8G8R8_UNORM = 121,
+    VIRTIO_GPU_FORMAT_R8G8B8X8_UNORM = 134,
+
+    // Stencil-Depth Formats
+    VIRTIO_GPU_FORMAT_Z16_UNORM = 16,
+    VIRTIO_GPU_FORMAT_Z32_UNORM = 17,
+    VIRTIO_GPU_FORMAT_Z32_FLOAT = 18,
+    VIRTIO_GPU_FORMAT_Z24_UNORM_S8_UINT = 19,
+    VIRTIO_GPU_FORMAT_S8_UINT_Z24_UNORM = 20,
+    VIRTIO_GPU_FORMAT_Z24X8_UNORM = 21,
+    VIRTIO_GPU_FORMAT_X8Z24_UNORM = 22,
+    VIRTIO_GPU_FORMAT_S8_UINT = 23,
+    VIRTIO_GPU_FORMAT_Z32_FLOAT_S8X24_UINT = 128,
+    VIRTIO_GPU_FORMAT_X24S8_UINT = 136,
+    VIRTIO_GPU_FORMAT_S8X24_UINT = 137,
+    VIRTIO_GPU_FORMAT_X32_S8X24_UINT = 138,
+
+};
+
+enum class VirGLCommand : u32 {
+    NOP = 0,
+    CREATE_OBJECT = 1,
+    BIND_OBJECT,
+    DESTROY_OBJECT,
+    SET_VIEWPORT_STATE,
+    SET_FRAMEBUFFER_STATE,
+    SET_VERTEX_BUFFERS,
+    CLEAR,
+    DRAW_VBO,
+    RESOURCE_INLINE_WRITE,
+    SET_SAMPLER_VIEWS,
+    SET_INDEX_BUFFER,
+    SET_CONSTANT_BUFFER,
+    SET_STENCIL_REF,
+    SET_BLEND_COLOR,
+    SET_SCISSOR_STATE,
+    BLIT,
+    RESOURCE_COPY_REGION,
+    BIND_SAMPLER_STATES,
+    BEGIN_QUERY,
+    END_QUERY,
+    GET_QUERY_RESULT,
+    SET_POLYGON_STIPPLE,
+    SET_CLIP_STATE,
+    SET_SAMPLE_MASK,
+    SET_STREAMOUT_TARGETS,
+    SET_RENDER_CONDITION,
+    SET_UNIFORM_BUFFER,
+
+    SET_SUB_CTX,
+    CREATE_SUB_CTX,
+    DESTROY_SUB_CTX,
+    BIND_SHADER,
+    SET_TESS_STATE,
+    SET_MIN_SAMPLES,
+    SET_SHADER_BUFFERS,
+    SET_SHADER_IMAGES,
+    MEMORY_BARRIER,
+    LAUNCH_GRID,
+    SET_FRAMEBUFFER_STATE_NO_ATTACH,
+    TEXTURE_BARRIER,
+    SET_ATOMIC_BUFFERS,
+    SET_DBG_FLAGS,
+    GET_QUERY_RESULT_QBO,
+    TRANSFER3D,
+    END_TRANSFERS,
+    COPY_TRANSFER3D,
+    SET_TWEAKS,
+    CLEAR_TEXTURE,
+    PIPE_RESOURCE_CREATE,
+    PIPE_RESOURCE_SET_TYPE,
+    GET_MEMORY_INFO,
+    SEND_STRING_MARKER,
+    MAX_COMMANDS
+};
+
+union ClearType {
+    struct {
+        u32 depth : 1;
+        u32 stencil : 1;
+        u32 color0 : 1;
+        u32 color1 : 1;
+        u32 color2 : 1;
+        u32 color3 : 1;
+        u32 color4 : 1;
+        u32 color5 : 1;
+        u32 color6 : 1;
+        u32 color7 : 1;
+    } flags;
+    u32 value;
+};
+
+enum class ObjectType : u32 {
+    NONE,
+    BLEND,
+    RASTERIZER,
+    DSA,
+    SHADER,
+    VERTEX_ELEMENTS,
+    SAMPLER_VIEW,
+    SAMPLER_STATE,
+    SURFACE,
+    QUERY,
+    STREAMOUT_TARGET,
+    MSAA_SURFACE,
+    MAX_OBJECTS,
+};
+
+enum class PipeTextureTarget : u32 {
+    BUFFER = 0,
+    TEXTURE_1D,
+    TEXTURE_2D,
+    TEXTURE_3D,
+    TEXTURE_CUBE,
+    TEXTURE_RECT,
+    TEXTURE_1D_ARRAY,
+    TEXTURE_2D_ARRAY,
+    TEXTURE_CUBE_ARRAY,
+    MAX
+};
+
+enum class PipePrimitiveTypes : u32 {
+    POINTS = 0,
+    LINES,
+    LINE_LOOP,
+    LINE_STRIP,
+    TRIANGLES,
+    TRIANGLE_STRIP,
+    TRIANGLE_FAN,
+    QUADS,
+    QUAD_STRIP,
+    POLYGON,
+    LINES_ADJACENCY,
+    LINE_STRIP_ADJACENCY,
+    TRIANGLES_ADJACENCY,
+    TRIANGLE_STRIP_ADJACENCY,
+    PATCHES,
+    MAX
+};
+
+}
+
+namespace Gallium {
+
+enum class PipeTextureTarget : u32 {
+    BUFFER,
+    TEXTURE_1D,
+    TEXTURE_2D,
+    TEXTURE_3D,
+    TEXTURE_CUBE,
+    TEXTURE_RECT,
+    TEXTURE_1D_ARRAY,
+    TEXTURE_2D_ARRAY,
+    TEXTURE_CUBE_ARRAY,
+    MAX_TEXTURE_TYPES,
+};
+
+enum class ShaderType : u32 {
+    SHADER_VERTEX = 0,
+    SHADER_FRAGMENT,
+    SHADER_GEOMETRY,
+    SHADER_TESS_CTRL,
+    SHADER_TESS_EVAL,
+    SHADER_COMPUTE,
+    SHADER_TYPES
+};
+
+}
diff --git a/Userland/Demos/VirGLDemo/Widget.cpp b/Userland/Demos/VirGLDemo/Widget.cpp
new file mode 100644
index 0000000000..41f640961f
--- /dev/null
+++ b/Userland/Demos/VirGLDemo/Widget.cpp
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2022, Sahan Fernando <sahan.h.fernando@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibGUI/Label.h>
+#include <LibGUI/Painter.h>
+
+#include "Widget.h"
+
+Demo::Demo()
+{
+    m_bitmap = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRx8888, { DRAWTARGET_WIDTH, DRAWTARGET_HEIGHT }).release_value_but_fixme_should_propagate_errors();
+    m_bitmap->fill(Gfx::Color::Black);
+
+    m_cycles = 0;
+
+    stop_timer();
+    start_timer(16);
+}
+
+Demo::~Demo() { }
+
+void Demo::paint_event(GUI::PaintEvent& event)
+{
+    GUI::Painter painter(*this);
+    painter.add_clip_rect(event.rect());
+    painter.draw_scaled_bitmap(rect(), *m_bitmap, m_bitmap->rect());
+}
+
+void Demo::timer_event(Core::TimerEvent&)
+{
+    m_cycles += 1;
+    update_frame(m_bitmap, m_cycles);
+    update();
+}
diff --git a/Userland/Demos/VirGLDemo/Widget.h b/Userland/Demos/VirGLDemo/Widget.h
new file mode 100644
index 0000000000..bf51ce7e2c
--- /dev/null
+++ b/Userland/Demos/VirGLDemo/Widget.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2022, Sahan Fernando <sahan.h.fernando@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/Widget.h>
+
+void update_frame(RefPtr<Gfx::Bitmap>, unsigned num_cycles);
+
+constexpr size_t DRAWTARGET_WIDTH = 500;
+constexpr size_t DRAWTARGET_HEIGHT = 500;
+
+class Demo final : public GUI::Widget {
+    C_OBJECT(Demo)
+public:
+    virtual ~Demo() override;
+    bool show_window_frame() const { return m_show_window_frame; }
+
+    Function<void(GUI::ContextMenuEvent&)> on_context_menu_request;
+
+protected:
+    virtual void context_menu_event(GUI::ContextMenuEvent& event) override
+    {
+        if (on_context_menu_request)
+            on_context_menu_request(event);
+    }
+
+private:
+    Demo();
+
+    RefPtr<Gfx::Bitmap> m_bitmap;
+
+    virtual void paint_event(GUI::PaintEvent&) override;
+    virtual void timer_event(Core::TimerEvent&) override;
+
+    int m_cycles;
+    bool m_show_window_frame { true };
+};