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use crate::error::WasmError;
use super::webgl;
use super::webgl::{WebGl2, ShaderType};
pub const MAIN_VERTEX_SHADER: &str = include_str!("main.vs");
pub const MAIN_FRAGMENT_SHADER: &str = include_str!("main.fs");
pub struct ShaderProgram {
program: webgl::WebGlProgram,
}
impl ShaderProgram {
pub fn from_sources(gl: &WebGl2, sources: &[(ShaderType, String)]) -> Result<Self, WasmError> {
let program = gl.create_program()
.map_err(|_| WasmError::Shader(format!("glCreateProgram failed ({})", gl.get_error())))?;
for (shader_type, source) in sources {
let shader = gl.create_shader(shader_type)
.map_err(|_| WasmError::Shader(format!("glCreateShader failed ({})", gl.get_error())))?;
gl.shader_source(&shader, source);
gl.compile_shader(&shader)
.map_err(|e| WasmError::Shader(format!("compile error in {} shader: {}", shader_type, e)))?;
gl.attach_shader(&program, &shader)
}
gl.link_program(&program)
.map_err(|e| WasmError::Shader(format!("linker error in program: {}", e)))?;
Ok(Self {
program
})
}
pub fn run(&self, gl: &WebGl2) {
gl.use_program(&self.program)
}
}
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