From b0854a665cdf29f27be0328e4717499d80ccaa98 Mon Sep 17 00:00:00 2001
From: Ricardo Alcantara <alcantarafox@yahoo.com.br>
Date: Tue, 21 Dec 2021 17:47:05 -0300
Subject: [PATCH] Update _2_text_rendering.rs

---
 Cargo.lock                              | 423 +++++++++++++-----------
 Cargo.toml                              |   2 +
 resources/fonts/Antonio-Bold.ttf        | Bin 0 -> 37504 bytes
 src/_7_in_practice/_2_text_rendering.rs | 260 +++++++++++++++
 src/_7_in_practice/mod.rs               |   2 +
 src/_7_in_practice/shaders/text.fs      |  12 +
 src/_7_in_practice/shaders/text.vs      |  12 +
 src/main.rs                             |   1 +
 8 files changed, 516 insertions(+), 196 deletions(-)
 create mode 100644 resources/fonts/Antonio-Bold.ttf
 create mode 100644 src/_7_in_practice/_2_text_rendering.rs
 create mode 100644 src/_7_in_practice/shaders/text.fs
 create mode 100644 src/_7_in_practice/shaders/text.vs

diff --git a/Cargo.lock b/Cargo.lock
index 31d991a..c3329f7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,631 +1,662 @@
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+# It is not intended for manual editing.
+version = 3
+
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-"checksum num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)" = "92e5113e9fd4cc14ded8e499429f396a20f98c772a47cc8622a736e1ec843c31"
-"checksum num-traits 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "630de1ef5cc79d0cdd78b7e33b81f083cbfe90de0f4b2b2f07f905867c70e9fe"
-"checksum num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c51a3322e4bca9d212ad9a158a02abc6934d005490c054a2778df73a70aa0a30"
-"checksum png 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f54b9600d584d3b8a739e1662a595fab051329eff43f20e7d8cc22872962145b"
-"checksum proc-macro2 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)" = "ee5697238f0d893c7f0ecc59c0999f18d2af85e424de441178bcacc9f9e6cf67"
-"checksum quote 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ed7d650913520df631972f21e104a4fa2f9c82a14afc65d17b388a2e29731e7c"
-"checksum rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8356f47b32624fef5b3301c1be97e5944ecdd595409cc5da11d05f211db6cfbd"
-"checksum rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e464cd887e869cddcae8792a4ee31d23c7edd516700695608f5b98c67ee0131c"
-"checksum rand_core 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "edecf0f94da5551fc9b492093e30b041a891657db7940ee221f9d2f66e82eef2"
-"checksum rayon 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "df7a791f788cb4c516f0e091301a29c2b71ef680db5e644a7d68835c8ae6dbfa"
-"checksum rayon-core 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b055d1e92aba6877574d8fe604a63c8b5df60f60e5982bf7ccbb1338ea527356"
-"checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
-"checksum scoped_threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1d51f5df5af43ab3f1360b429fa5e0152ac5ce8c0bd6485cae490332e96846a8"
-"checksum scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "94258f53601af11e6a49f722422f6e3425c52b06245a5cf9bc09908b174f5e27"
-"checksum semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2d5b7638a1f03815d94e88cb3b3c08e87f0db4d683ef499d1836aaf70a45623f"
-"checksum syn 0.14.8 (registry+https://github.com/rust-lang/crates.io-index)" = "b7bfcbb0c068d0f642a0ffbd5c604965a360a61f99e8add013cef23a838614f3"
-"checksum tobj 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c5eb0cdeabef6fcefb92c6dcb8571ba1880d36eb608da4f9cf62673765eadc31"
-"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
-"checksum version_check 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "7716c242968ee87e5542f8021178248f267f295a5c4803beae8b8b7fd9bc6051"
-"checksum winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "773ef9dcc5f24b7d850d0ff101e542ff24c3b090a9768e03ff889fdef41f00fd"
-"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-"checksum xml-rs 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c1cb601d29fe2c2ac60a2b2e5e293994d87a1f6fa9687a31a15270f909be9c2"
+ "bitflags",
+]
diff --git a/Cargo.toml b/Cargo.toml
index a7b1dd4..e8e7ff7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,6 +12,8 @@ image = "0.19.0"
 tobj = "0.1.6"
 num = "0.2.0"
 rand = "0.5.5"
+# only needed from chapter 7 text_rendering
+freetype-rs = "0.29.0"
 
 [features]
 default = [
diff --git a/resources/fonts/Antonio-Bold.ttf b/resources/fonts/Antonio-Bold.ttf
new file mode 100644
index 0000000000000000000000000000000000000000..6e78cd28971553405c51c9d31bf17472c1e2089d
GIT binary patch
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diff --git a/src/_7_in_practice/_2_text_rendering.rs b/src/_7_in_practice/_2_text_rendering.rs
new file mode 100644
index 0000000..34fe361
--- /dev/null
+++ b/src/_7_in_practice/_2_text_rendering.rs
@@ -0,0 +1,260 @@
+#![allow(non_upper_case_globals)]
+extern crate glfw;
+use self::glfw::{Action, Context, Key};
+
+extern crate gl;
+use self::gl::types::*;
+
+use std::collections::HashMap;
+use std::ffi::CStr;
+use std::mem;
+use std::os::raw::c_void;
+use std::path::Path;
+use std::ptr;
+use std::sync::mpsc::Receiver;
+
+use cgmath::{Matrix, Matrix4};
+
+use shader::Shader;
+
+// settings
+const SCR_WIDTH: u32 = 800;
+const SCR_HEIGHT: u32 = 600;
+
+struct Character {
+    texture: u32,
+    size: cgmath::Vector2<i32>,
+    bearing: cgmath::Vector2<i32>,
+    advance: u32,
+}
+
+#[allow(non_snake_case)]
+pub fn main_7_2() {
+    // glfw: initialize and configure
+    // ------------------------------
+    let mut glfw = glfw::init(glfw::FAIL_ON_ERRORS).unwrap();
+    glfw.window_hint(glfw::WindowHint::ContextVersion(3, 3));
+    glfw.window_hint(glfw::WindowHint::OpenGlProfile(glfw::OpenGlProfileHint::Core));
+    #[cfg(target_os = "macos")]
+    glfw.window_hint(glfw::WindowHint::OpenGlForwardCompat(true));
+
+    // glfw window creation
+    // --------------------
+    let (mut window, events) = glfw
+        .create_window(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", glfw::WindowMode::Windowed)
+        .expect("Failed to create GLFW window");
+
+    window.make_current();
+    window.set_key_polling(true);
+    window.set_framebuffer_size_polling(true);
+
+    // gl: load all OpenGL function pointers
+    // ---------------------------------------
+    gl::load_with(|symbol| window.get_proc_address(symbol) as *const _);
+
+    let (shader, vao, vbo, characters) = unsafe {
+        // OpenGL state
+        // ------------
+        gl::Enable(gl::CULL_FACE);
+        gl::Enable(gl::BLEND);
+        gl::BlendFunc(gl::SRC_ALPHA, gl::ONE_MINUS_SRC_ALPHA);
+
+        // compile and setup the shader
+        // ----------------------------
+        let shader = Shader::new("src/_7_in_practice/shaders/text.vs", "src/_7_in_practice/shaders/text.fs");
+        let projection: Matrix4<f32> = cgmath::ortho(0.0, SCR_WIDTH as f32, 0.0, SCR_HEIGHT as f32, -1.0, 1.0);
+        shader.useProgram();
+        let projection_loc = gl::GetUniformLocation(shader.ID, c_str!("projection").as_ptr());
+        gl::UniformMatrix4fv(projection_loc, 1, gl::FALSE, projection.as_ptr());
+
+        // Init the library
+        let lib = freetype::Library::init().expect("ERROR::FREETYPE: Could not init FreeType Library");
+        // find path to font
+        let font_name = Path::new("resources/fonts/Antonio-Bold.ttf");
+        if !font_name.exists() {
+            print!("ERROR::FREETYPE: Failed to load font_name");
+            return;
+        }
+        // Load a font face
+        let face = lib
+            .new_face(font_name, 0)
+            .expect("ERROR::FREETYPE: Failed to load font");
+
+        // set size to load glyphs as
+        face.set_pixel_sizes(0, 48).unwrap();
+
+        // disable byte-alignment restriction
+        gl::PixelStorei(gl::UNPACK_ALIGNMENT, 1);
+
+        let mut characters: HashMap<GLchar, Character> = HashMap::new();
+
+        // load first 128 characters of ASCII set
+        for c in 0..128 {
+            // Load character glyph
+            face.load_char(c, freetype::face::LoadFlag::RENDER)
+                .expect("ERROR::FREETYTPE: Failed to load Glyph");
+
+            let bitmap = face.glyph().bitmap();
+            // generate texture
+            let mut texture = 0;
+            gl::GenTextures(1, &mut texture);
+            gl::BindTexture(gl::TEXTURE_2D, texture);
+            gl::TexImage2D(
+                gl::TEXTURE_2D,
+                0,
+                gl::RED as i32,
+                bitmap.width(),
+                bitmap.rows() as i32,
+                0,
+                gl::RED,
+                gl::UNSIGNED_BYTE,
+                bitmap.buffer().as_ptr() as *const c_void,
+            );
+            // set texture options
+            gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_WRAP_S, gl::CLAMP_TO_EDGE as i32);
+            gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_WRAP_T, gl::CLAMP_TO_EDGE as i32);
+            gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MIN_FILTER, gl::LINEAR as i32);
+            gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MAG_FILTER, gl::LINEAR as i32);
+            // now store character for later use
+            let character = Character {
+                texture,
+                size: cgmath::vec2(bitmap.width(), bitmap.rows()),
+                bearing: cgmath::vec2(face.glyph().bitmap_left(), face.glyph().bitmap_top()),
+                advance: face.glyph().advance().x as u32,
+            };
+
+            characters.insert(c as GLchar, character);
+        }
+        gl::BindTexture(gl::TEXTURE_2D, 0);
+
+        // configure VAO/VBO for texture quads
+        // -----------------------------------
+        let (mut VBO, mut VAO) = (0, 0);
+        gl::GenVertexArrays(1, &mut VAO);
+        gl::GenBuffers(1, &mut VBO);
+        gl::BindVertexArray(VAO);
+        gl::BindBuffer(gl::ARRAY_BUFFER, VBO);
+        gl::BufferData(gl::ARRAY_BUFFER, 6 * 4 * mem::size_of::<f32>() as GLsizeiptr, ptr::null(), gl::DYNAMIC_DRAW);
+        gl::EnableVertexAttribArray(0);
+        gl::VertexAttribPointer(0, 4, gl::FLOAT, gl::FALSE, 4 * mem::size_of::<f32>() as GLsizei, ptr::null());
+        gl::BindBuffer(gl::ARRAY_BUFFER, 0);
+        gl::BindVertexArray(0);
+
+        (shader, VAO, VBO, characters)
+    };
+
+    // render loop
+    // -----------
+    while !window.should_close() {
+        // events
+        // -----
+
+        process_events(&mut window, &events);
+        unsafe {
+            gl::ClearColor(0.2, 0.3, 0.3, 1.0);
+            gl::Clear(gl::COLOR_BUFFER_BIT);
+            render_text(
+                &shader,
+                vao,
+                vbo,
+                &characters,
+                String::from("This is sample text"),
+                25.0,
+                25.0,
+                1.0,
+                cgmath::vec3(0.5, 0.8, 0.2),
+            );
+            render_text(
+                &shader,
+                vao,
+                vbo,
+                &characters,
+                String::from("(C) LearnOpenGL.com"),
+                540.0,
+                570.0,
+                0.5,
+                cgmath::vec3(0.3, 0.7, 0.9),
+            );
+        }
+
+        // glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
+        // -------------------------------------------------------------------------------
+        window.swap_buffers();
+        glfw.poll_events();
+    }
+}
+
+fn process_events(window: &mut glfw::Window, events: &Receiver<(f64, glfw::WindowEvent)>) {
+    for (_, event) in glfw::flush_messages(events) {
+        match event {
+            glfw::WindowEvent::FramebufferSize(width, height) => {
+                // make sure the viewport matches the new window dimensions; note that width and
+                // height will be significantly larger than specified on retina displays.
+                unsafe { gl::Viewport(0, 0, width, height) }
+            }
+            glfw::WindowEvent::Key(Key::Escape, _, Action::Press, _) => window.set_should_close(true),
+            _ => {}
+        }
+    }
+}
+
+// render line of text
+// -------------------
+unsafe fn render_text(
+    shader: &Shader,
+    vao: u32,
+    vbo: u32,
+    characters: &HashMap<GLchar, Character>,
+    text: String,
+    x: f32,
+    y: f32,
+    scale: f32,
+    color: cgmath::Vector3<f32>,
+) {
+    // activate corresponding render state
+    shader.useProgram();
+    let text_color_loc = gl::GetUniformLocation(shader.ID, c_str!("textColor").as_ptr());
+    gl::Uniform3f(text_color_loc, color.x, color.y, color.z);
+    gl::ActiveTexture(gl::TEXTURE0);
+    gl::BindVertexArray(vao);
+
+    let mut x_pos = x;
+
+    // iterate through all characters
+    for c in text.chars() {
+        let key_c = c as GLchar;
+        let ch = &characters[&key_c];
+
+        let xpos = x_pos + ch.bearing.x as f32 * scale;
+        let ypos = y - (ch.size.y - ch.bearing.y) as f32 * scale;
+
+        let w = ch.size.x as f32 * scale;
+        let h = ch.size.y as f32 * scale;
+
+        #[rustfmt::skip]
+        let vertices: [[f32; 4]; 6] = [
+            [ xpos,     ypos + h,   0.0, 0.0 ],
+            [ xpos,     ypos,       0.0, 1.0 ],
+            [ xpos + w, ypos,       1.0, 1.0 ],
+
+            [ xpos,     ypos + h,   0.0, 0.0 ],
+            [ xpos + w, ypos,       1.0, 1.0 ],
+            [ xpos + w, ypos + h,   1.0, 0.0 ],
+        ];
+
+        // render glyph texture over quad
+        gl::BindTexture(gl::TEXTURE_2D, ch.texture);
+        // update content of VBO memory
+        gl::BindBuffer(gl::ARRAY_BUFFER, vbo);
+        gl::BufferSubData(gl::ARRAY_BUFFER, 0, mem::size_of_val(&vertices) as GLsizeiptr, mem::transmute(&vertices[0])); // be sure to use gl::BufferSubData and not gl::BufferData
+
+        gl::BindBuffer(gl::ARRAY_BUFFER, 0);
+        // render quad
+        gl::DrawArrays(gl::TRIANGLES, 0, 6);
+        // now advance cursors for next glyph (note that advance is number of 1/64 pixels)
+        x_pos += (ch.advance >> 6) as f32 * scale; // bitshift by 6 to get value in pixels (2^6 = 64 (divide amount of 1/64th pixels by 64 to get amount of pixels))
+    }
+
+    gl::BindVertexArray(0);
+    gl::BindTexture(gl::TEXTURE_2D, 0);
+}
diff --git a/src/_7_in_practice/mod.rs b/src/_7_in_practice/mod.rs
index 43fc988..92d1419 100644
--- a/src/_7_in_practice/mod.rs
+++ b/src/_7_in_practice/mod.rs
@@ -1,2 +1,4 @@
 mod _1_debugging;
 pub use self::_1_debugging::*;
+mod _2_text_rendering;
+pub use self::_2_text_rendering::*;
diff --git a/src/_7_in_practice/shaders/text.fs b/src/_7_in_practice/shaders/text.fs
new file mode 100644
index 0000000..bbd0c17
--- /dev/null
+++ b/src/_7_in_practice/shaders/text.fs
@@ -0,0 +1,12 @@
+#version 330 core
+in vec2 TexCoords;
+out vec4 color;
+
+uniform sampler2D text;
+uniform vec3 textColor;
+
+void main()
+{    
+    vec4 sampled = vec4(1.0, 1.0, 1.0, texture(text, TexCoords).r);
+    color = vec4(textColor, 1.0) * sampled;
+}
\ No newline at end of file
diff --git a/src/_7_in_practice/shaders/text.vs b/src/_7_in_practice/shaders/text.vs
new file mode 100644
index 0000000..bc275bd
--- /dev/null
+++ b/src/_7_in_practice/shaders/text.vs
@@ -0,0 +1,12 @@
+#version 330 core
+layout (location = 0) in vec4 vertex; // <vec2 pos, vec2 tex>
+out vec2 TexCoords;
+
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * vec4(vertex.xy, 0.0, 1.0);
+    TexCoords = vertex.zw;
+}
+
diff --git a/src/main.rs b/src/main.rs
index 1d19d31..b711a40 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -118,6 +118,7 @@ fn main() {
         #[cfg(feature = "chapter-6")] "6_1_2" => main_6_1_2(),
 
         #[cfg(feature = "chapter-7")] "7_1" => main_7_1(),
+        #[cfg(feature = "chapter-7")] "7_2" => main_7_2(),
 
         _     => println!("Unknown tutorial id")
     }