1 files changed, 71 insertions, 0 deletions
diff --git a/source/dw/app/getshdprg.rs b/source/dw/app/getshdprg.rs
new file mode 100644
index 0000000..2e02ff8
--- /dev/null
+++ b/source/dw/app/getshdprg.rs
@@ -0,0 +1,71 @@
+// Copyright 2023 Gabriel Jensen.
+
+use crate::dw::{app::App,datpth};
+
+extern crate gl;
+
+use gl::{AttachShader,COMPILE_STATUS,CompileShader,CreateProgram,CreateShader,DeleteShader,FALSE,FRAGMENT_SHADER,GetShaderiv,LinkProgram,ShaderSource,VERTEX_SHADER};
+use gl::types::{GLchar,GLenum,GLint,GLuint};
+use std::fs::read;
+use std::ptr::{addr_of,null};
+
+impl App {
+	pub fn getshdprg(&mut self) -> GLuint {
+		eprintln!("compiling shaders");
+
+		let cmpshd = |nam: & str,typ:GLenum| -> GLuint {
+			let typstr = match typ {
+				FRAGMENT_SHADER => "fragment",
+				VERTEX_SHADER   => "vertex",
+				_               => panic!("invalid shader type {}",typ),
+			};
+
+			let filext = match typ {
+				FRAGMENT_SHADER => "frag",
+				VERTEX_SHADER   => "vert",
+				_               => panic!("invalid shader type {}",typ),
+			};
+
+			let mut pth = String::new();
+			pth.push_str(datpth());
+			pth.push_str("/shader/");
+			pth.push_str(nam);
+			pth.push(    '.');
+			pth.push_str(filext);
+			pth.push_str(".glsl");
+
+			eprintln!("compiling {} shader at \"{}\"",typstr,pth);
+
+			let src = read(pth).expect("unable to read shader at");
+
+			unsafe {
+				let shd    = CreateShader(typ);
+				let srcptr = src.as_ptr();
+				ShaderSource(shd,0x1,addr_of!(srcptr) as *const *const GLchar,null::<GLint>());
+
+				CompileShader(shd);
+
+				let mut sts:GLint = 0x0;
+				GetShaderiv(shd,COMPILE_STATUS,&mut sts);
+				if sts == FALSE as GLint {panic!("unable to compile shader");}
+
+				return shd;
+			}
+		};
+
+		let frgshd = cmpshd("main",FRAGMENT_SHADER);
+		let vtxshd = cmpshd("main",VERTEX_SHADER);
+		
+		unsafe {
+			let prg = CreateProgram();
+			AttachShader(prg,frgshd);
+			AttachShader(prg,vtxshd);
+			LinkProgram(prg);
+
+			DeleteShader(frgshd);
+			DeleteShader(vtxshd);
+
+			return prg;
+		}
+	}
+}