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200 lines
5.8 KiB
200 lines
5.8 KiB
use citro3d::{include_aligned_bytes, shader}; |
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use citro3d_sys::C3D_Mtx; |
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use ctru::gfx::{Gfx, Side}; |
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use ctru::services::apt::Apt; |
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use ctru::services::hid::{Hid, KeyPad}; |
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use ctru::services::soc::Soc; |
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use citro3d::render::{ClearFlags, DepthFormat}; |
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use std::ffi::CStr; |
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use std::mem::MaybeUninit; |
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#[repr(C)] |
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struct Vec3 { |
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x: f32, |
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y: f32, |
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z: f32, |
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} |
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impl Vec3 { |
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const fn new(x: f32, y: f32, z: f32) -> Self { |
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Self { x, y, z } |
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} |
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} |
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#[repr(C)] |
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struct Vertex { |
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pos: Vec3, |
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color: Vec3, |
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} |
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const VERTICES: &[Vertex] = &[ |
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Vertex { |
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pos: Vec3::new(0.0, 0.5, 0.5), |
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color: Vec3::new(1.0, 0.0, 0.0), |
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}, |
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Vertex { |
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pos: Vec3::new(-0.5, -0.5, 0.5), |
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color: Vec3::new(0.0, 1.0, 0.0), |
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}, |
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Vertex { |
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pos: Vec3::new(0.5, -0.5, 0.5), |
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color: Vec3::new(0.0, 0.0, 1.0), |
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}, |
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]; |
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const SHADER_BYTES: &[u8] = |
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include_aligned_bytes!(concat!(env!("OUT_DIR"), "/examples/assets/vshader.shbin")); |
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fn main() { |
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ctru::init(); |
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let mut soc = Soc::init().expect("failed to get SOC"); |
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drop(soc.redirect_to_3dslink(true, true)); |
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let gfx = Gfx::init().expect("Couldn't obtain GFX controller"); |
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let hid = Hid::init().expect("Couldn't obtain HID controller"); |
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let apt = Apt::init().expect("Couldn't obtain APT controller"); |
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let mut top_screen = gfx.top_screen.borrow_mut(); |
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let frame_buffer = top_screen.get_raw_framebuffer(Side::Left); |
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let mut instance = citro3d::Instance::new().expect("failed to initialize Citro3D"); |
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let mut render_target = citro3d::render::Target::new( |
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frame_buffer.width, |
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frame_buffer.height, |
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&mut *top_screen, |
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DepthFormat::Depth24Stencil8, |
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) |
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.expect("failed to create render target"); |
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render_target.set_output(Side::Left); |
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let shader = shader::Library::from_bytes(SHADER_BYTES).unwrap(); |
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let vertex_shader = shader.get(0).unwrap(); |
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let mut program = shader::Program::new(vertex_shader).unwrap(); |
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let (uloc_projection, projection, vbo_data) = scene_init(&mut program); |
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while apt.main_loop() { |
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hid.scan_input(); |
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if hid.keys_down().contains(KeyPad::KEY_START) { |
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break; |
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} |
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instance.render_frame_with(|instance| { |
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let clear_color: u32 = 0x7F_7F_7F_FF; |
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render_target.clear(ClearFlags::ALL, clear_color, 0); |
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instance |
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.select_render_target(&render_target) |
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.expect("failed to set render target"); |
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scene_render(uloc_projection.into(), &projection); |
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}); |
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} |
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scene_exit(vbo_data); |
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} |
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fn scene_init(program: &mut shader::Program) -> (i8, C3D_Mtx, *mut libc::c_void) { |
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// Load the vertex shader, create a shader program and bind it |
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unsafe { |
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citro3d_sys::C3D_BindProgram(program.as_raw()); |
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// Get the location of the uniforms |
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let projection_name = CStr::from_bytes_with_nul(b"projection\0").unwrap(); |
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let uloc_projection = citro3d_sys::shaderInstanceGetUniformLocation( |
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(*program.as_raw()).vertexShader, |
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projection_name.as_ptr(), |
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); |
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// Configure attributes for use with the vertex shader |
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let attr_info = citro3d_sys::C3D_GetAttrInfo(); |
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citro3d_sys::AttrInfo_Init(attr_info); |
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citro3d_sys::AttrInfo_AddLoader(attr_info, 0, citro3d_sys::GPU_FLOAT, 3); // v0=position |
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citro3d_sys::AttrInfo_AddLoader(attr_info, 1, citro3d_sys::GPU_FLOAT, 3); // v1=color |
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// Compute the projection matrix |
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let projection = { |
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let mut projection = MaybeUninit::uninit(); |
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citro3d_sys::Mtx_OrthoTilt( |
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projection.as_mut_ptr(), |
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// The 3ds top screen is a 5:3 ratio |
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-1.66, |
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1.66, |
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-1.0, |
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1.0, |
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0.0, |
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1.0, |
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true, |
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); |
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projection.assume_init() |
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}; |
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// Create the vertex buffer object |
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let vbo_data: *mut Vertex = citro3d_sys::linearAlloc( |
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std::mem::size_of_val(&VERTICES) |
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.try_into() |
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.expect("size fits in u32"), |
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) |
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.cast(); |
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vbo_data.copy_from(VERTICES.as_ptr(), VERTICES.len()); |
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// Configure buffers |
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let buf_info = citro3d_sys::C3D_GetBufInfo(); |
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citro3d_sys::BufInfo_Init(buf_info); |
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citro3d_sys::BufInfo_Add( |
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buf_info, |
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vbo_data.cast(), |
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std::mem::size_of::<Vertex>() |
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.try_into() |
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.expect("size of vec3 fits in u32"), |
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2, // Each vertex has two attributes |
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0x10, // v0 = position, v1 = color, in LSB->MSB nibble order |
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); |
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// Configure the first fragment shading substage to just pass through the vertex color |
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// See https://www.opengl.org/sdk/docs/man2/xhtml/glTexEnv.xml for more insight |
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let env = citro3d_sys::C3D_GetTexEnv(0); |
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citro3d_sys::C3D_TexEnvInit(env); |
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citro3d_sys::C3D_TexEnvSrc( |
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env, |
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citro3d_sys::C3D_Both, |
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citro3d_sys::GPU_PRIMARY_COLOR, |
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0, |
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0, |
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); |
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citro3d_sys::C3D_TexEnvFunc(env, citro3d_sys::C3D_Both, citro3d_sys::GPU_REPLACE); |
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(uloc_projection, projection, vbo_data.cast()) |
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} |
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} |
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fn scene_render(uloc_projection: i32, projection: &C3D_Mtx) { |
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unsafe { |
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// Update the uniforms |
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citro3d_sys::C3D_FVUnifMtx4x4(citro3d_sys::GPU_VERTEX_SHADER, uloc_projection, projection); |
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// Draw the VBO |
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citro3d_sys::C3D_DrawArrays( |
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citro3d_sys::GPU_TRIANGLES, |
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0, |
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VERTICES |
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.len() |
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.try_into() |
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.expect("VERTICES.len() fits in i32"), |
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); |
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} |
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} |
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fn scene_exit(vbo_data: *mut libc::c_void) { |
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unsafe { |
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citro3d_sys::linearFree(vbo_data); |
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} |
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}
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