From 53446631bf579c85786af1b4c8fcd54566c0d391 Mon Sep 17 00:00:00 2001
From: pommicket <pommicket@gmail.com>
Date: Sun, 18 Dec 2022 12:07:30 -0500
Subject: switch framebuffer texture to grayscale

---
 src/main.rs | 14 +++++---------
 src/win.rs  | 17 +++++++++++++++++
 2 files changed, 22 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index 0933637..eb3728a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -6,10 +6,7 @@
 - options for:
 	- max framerate
 - [ and ] to move through time
-- switch framebuffer texture to grayscale
-- show that   θ = σ(z) / sqrt(x² + y²)
-			  (x,y,z) → (x cosθ + y sinθ, y cosθ - x sinθ, z)
-  is lipschitz continuous, & add it
+- come up with twisty lipschitz continuous function, & add it
 - feedback for copy/paste (flash screen or something)
 - feedback for pause/unpause/rewind (flash icons)
 - Params instead of depth for GenRandom
@@ -62,7 +59,7 @@ use std::{
 	io::{prelude::*, BufReader},
 	time::Instant,
 };
-use win::ColorF32;
+use win::ColorGrayscaleF32;
 
 type Vec3 = Vector3<f32>;
 type Mat3 = Matrix3<f32>;
@@ -283,11 +280,10 @@ impl State {
 		programs
 			.load_scene(&mut window, &scene)
 			.unwrap_or_else(|e| eprintln!("Error: {e}"));
-		//gen_program_from_string(&mut window, &mut program, "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")?;
 
 		let mut framebuffer_texture = window.create_texture(&Default::default());
 		// we don't really care if there's an error. not much bad will happen.
-		let _ = window.set_texture_no_data::<win::ColorF32>(
+		let _ = window.set_texture_no_data::<ColorGrayscaleF32>(
 			&mut framebuffer_texture,
 			TEST_WIDTH.into(),
 			TEST_HEIGHT.into(),
@@ -376,9 +372,9 @@ impl State {
 
 				let mut sdf_values: Vec<f32> = self
 					.window
-					.get_texture_data_vec::<ColorF32>(&self.framebuffer_texture)
+					.get_texture_data_vec::<ColorGrayscaleF32>(&self.framebuffer_texture)
 					.iter()
-					.map(|c| c.r)
+					.map(|c| c.value)
 					.collect();
 				let i = (sdf_values.len() as f64 * frac) as usize;
 				let level_set = *sdf_values
diff --git a/src/win.rs b/src/win.rs
index 1622b82..146ba54 100644
--- a/src/win.rs
+++ b/src/win.rs
@@ -492,6 +492,23 @@ unsafe impl Color for ColorF32 {
 	const GL_TYPE: GLenum = gl::FLOAT;
 }
 
+#[repr(C)]
+#[derive(Clone, Copy, Default)]
+pub struct ColorGrayscaleF32 {
+	pub value: f32
+}
+
+impl ColorGrayscaleF32 {
+	pub const fn new(value: f32) -> Self {
+		Self { value }
+	}
+}
+
+unsafe impl Color for ColorGrayscaleF32 {
+	const GL_FORMAT: GLenum = gl::RED;
+	const GL_TYPE: GLenum = gl::FLOAT;
+}
+
 pub struct Shader {
 	id: GLuint,
 	/// shaders should not be sent across threads because of the drop function.
-- 
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