1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

// Copyright 2014 The Gfx-rs Developers.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Shader parameter handling.

#[cfg(feature = "cgmath-types")]
use cgmath::{Deg, Matrix2, Matrix3, Matrix4, Rad, Point2, Point3, Vector2, Vector3, Vector4};

use std::error::Error;
use std::fmt;
pub use core::shade::{self as core, ConstFormat, Formatted, Usage};

#[allow(missing_docs)]
pub trait ToUniform: Copy {
    fn convert(self) -> core::UniformValue;
}

macro_rules! impl_uniforms {
    ( $( $ty_src:ty = $ty_dst:ident ,)* ) => {
        $(
            impl ToUniform for $ty_src {
                fn convert(self) -> core::UniformValue {
                    core::UniformValue::$ty_dst(self.into())
                }
            }
        )*
    }
}

impl_uniforms! {
    i32 = I32,
    f32 = F32,
    [i32; 2] = I32Vector2,
    [i32; 3] = I32Vector3,
    [i32; 4] = I32Vector4,
    [f32; 2] = F32Vector2,
    [f32; 3] = F32Vector3,
    [f32; 4] = F32Vector4,
    [[f32; 2]; 2] = F32Matrix2,
    [[f32; 3]; 3] = F32Matrix3,
    [[f32; 4]; 4] = F32Matrix4,
}

#[cfg(feature = "cgmath-types")]
impl ToUniform for Deg<f32> {
    fn convert(self) -> core::UniformValue {
        core::UniformValue::F32(self.0)
    }
}

#[cfg(feature = "cgmath-types")]
impl ToUniform for Rad<f32> {
    fn convert(self) -> core::UniformValue {
        core::UniformValue::F32(self.0)
    }
}

#[cfg(feature = "cgmath-types")]
impl_uniforms! {
    Point2<f32> = F32Vector2,
    Point3<f32> = F32Vector3,
    Vector2<f32> = F32Vector2,
    Vector3<f32> = F32Vector3,
    Vector4<f32> = F32Vector4,
    Matrix2<f32> = F32Matrix2,
    Matrix3<f32> = F32Matrix3,
    Matrix4<f32> = F32Matrix4,
}

/// Program linking error
#[derive(Clone, Debug, PartialEq)]
pub enum ProgramError {
    /// Unable to compile the vertex shader
    Vertex(core::CreateShaderError),
    /// Unable to compile the hull shader
    Hull(core::CreateShaderError),
    /// Unable to compile the domain shader
    Domain(core::CreateShaderError),
    /// Unable to compile the geometry shader
    Geometry(core::CreateShaderError),
    /// Unable to compile the pixel shader
    Pixel(core::CreateShaderError),
    /// Unable to link
    Link(core::CreateProgramError),
}

impl fmt::Display for ProgramError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            ProgramError::Vertex(ref e) => write!(f, "{}: {}", self.description(), e),
            ProgramError::Hull(ref e) => write!(f, "{}: {}", self.description(), e),
            ProgramError::Domain(ref e) => write!(f, "{}: {}", self.description(), e),
            ProgramError::Geometry(ref e) => write!(f, "{}: {}", self.description(), e),
            ProgramError::Pixel(ref e) => write!(f, "{}: {}", self.description(), e),
            ProgramError::Link(ref e) => write!(f, "{}: {}", self.description(), e),
        }
    }
}

impl Error for ProgramError {
    fn description(&self) -> &str {
        match *self {
            ProgramError::Vertex(_) => "Unable to compile the vertex shader",
            ProgramError::Hull(_) => "Unable to compile the hull shader",
            ProgramError::Domain(_) => "Unable to compile the domain shader",
            ProgramError::Geometry(_) => "Unable to compile the geometry shader",
            ProgramError::Pixel(_) => "Unable to compile the pixel shader",
            ProgramError::Link(_) => "Unable to link",
        }
    }

    fn cause(&self) -> Option<&Error> {
        match *self {
            ProgramError::Vertex(ref e) => Some(e),
            ProgramError::Hull(ref e) => Some(e),
            ProgramError::Domain(ref e) => Some(e),
            ProgramError::Geometry(ref e) => Some(e),
            ProgramError::Pixel(ref e) => Some(e),
            ProgramError::Link(ref e) => Some(e),
        }
    }
}