655 lines
18 KiB
Rust
655 lines
18 KiB
Rust
// Copyright 2015 Matthew Collins
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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extern crate steven_gl as gl;
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use glutin;
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use std::ops::BitOr;
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use std::ffi;
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use std::mem;
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use std::ptr;
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use std::ops::{Deref, DerefMut};
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/// Inits the gl library. This should be called once a context is ready.
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pub fn init(window: &mut glutin::Window) {
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gl::load_with(|s| window.get_proc_address(s));
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}
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/// Dsed to specify how the vertices will be handled
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/// to draw.
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pub type DrawType = u32;
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/// Treats each set of 3 vertices as a triangle
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pub const TRIANGLES: DrawType = gl::TRIANGLES;
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/// Means the previous vertex connects to the next
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/// one in a continuous strip.
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pub const LINE_STRIP: DrawType = gl::LINE_STRIP;
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/// Treats each set of 2 vertices as a line
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pub const LINES: DrawType = gl::LINES;
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/// Treats each vertex as a point
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pub const POINTS: DrawType = gl::POINTS;
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pub fn draw_elements(ty: DrawType, count: usize, dty: Type, offset: usize) {
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unsafe {
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gl::DrawElements(ty, count as i32, dty, offset as *const gl::types::GLvoid);
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}
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}
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/// Sets the size of the viewport of this context.
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pub fn viewport(x: i32, y: i32, w: i32, h: i32) {
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unsafe {
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gl::Viewport(x, y, w, h);
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}
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}
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/// Sets the color the color buffer should be cleared to
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/// when Clear is called with the color flag.
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pub fn clear_color(r: f32, g: f32, b: f32, a: f32) {
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unsafe {
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gl::ClearColor(r, g, b, a);
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}
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}
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/// ClearFlags is a set of flags to mark what should be cleared during
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/// a Clear call.
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pub enum ClearFlags {
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/// Marks the color buffer to be cleared
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Color,
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/// Marks the depth buffer to be cleared
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Depth,
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Internal(u32),
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}
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impl ClearFlags {
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fn internal(self) -> u32 {
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match self {
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ClearFlags::Color => gl::COLOR_BUFFER_BIT,
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ClearFlags::Depth => gl::DEPTH_BUFFER_BIT,
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ClearFlags::Internal(val) => val,
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}
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}
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}
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impl BitOr for ClearFlags {
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type Output = ClearFlags;
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fn bitor(self, rhs: ClearFlags) -> ClearFlags {
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ClearFlags::Internal(self.internal() | rhs.internal())
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}
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}
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/// Clears the buffers specified by the passed flags.
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pub fn clear(flags: ClearFlags) {
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unsafe { gl::Clear(flags.internal()) }
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}
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/// Func is a function to be preformed on two values.
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pub type Func = u32;
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pub const NEVER: Func = gl::NEVER;
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pub const LESS: Func = gl::LESS;
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pub const LESS_OR_EQUAL: Func = gl::LEQUAL;
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pub const GREATER: Func = gl::GREATER;
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pub const ALWAYS: Func = gl::ALWAYS;
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pub const EQUAL: Func = gl::EQUAL;
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pub fn depth_func(f: Func) {
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unsafe {
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gl::DepthFunc(f);
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}
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}
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/// Flag is a setting that can be enabled or disabled on the context.
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pub type Flag = u32;
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pub const DEPTH_TEST: Flag = gl::DEPTH_TEST;
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pub const CULL_FACE_FLAG: Flag = gl::CULL_FACE;
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pub const STENCIL_TEST: Flag = gl::STENCIL_TEST;
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pub const BLEND: Flag = gl::BLEND;
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pub const MULTISAMPLE: Flag = gl::MULTISAMPLE;
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/// Enables the passed flag.
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pub fn enable(f: Flag) {
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unsafe {
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gl::Enable(f);
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}
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}
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/// Disables the passed flag.
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pub fn disable(f: Flag) {
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unsafe {
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gl::Disable(f);
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}
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}
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/// Sets the texture slot with the passed id as the
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/// currently active one.
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pub fn active_texture(id: u32) {
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unsafe {
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gl::ActiveTexture(gl::TEXTURE0 + id);
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}
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}
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/// Factor is used in blending
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pub type Factor = u32;
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pub const SRC_ALPHA: Factor = gl::SRC_ALPHA;
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pub const ONE_MINUS_SRC_ALPHA: Factor = gl::ONE_MINUS_SRC_ALPHA;
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pub const ONE_FACTOR: Factor = gl::ONE;
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pub const ZERO_FACTOR: Factor = gl::ZERO;
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/// Sets the factors to be used when blending.
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pub fn blend_func(s_factor: Factor, d_factor: Factor) {
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unsafe {
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gl::BlendFunc(s_factor, d_factor);
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}
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}
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// Face specifies a face to act on.
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pub type Face = u32;
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pub const BACK: Face = gl::BACK;
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pub const FRONT: Face = gl::FRONT;
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/// Sets the face to be culled by the gpu.
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pub fn cull_face(face: Face) {
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unsafe {
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gl::CullFace(face);
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}
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}
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// FaceDirection is used to specify an order of vertices, normally
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// used to set which is considered to be the front face.
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pub type FaceDirection = u32;
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pub const CLOCK_WISE: FaceDirection = gl::CW;
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pub const COUNTER_CLOCK_WISE: FaceDirection = gl::CCW;
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/// Sets the direction of vertices used to specify the
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/// front face (e.g. for culling).
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pub fn front_face(dir: FaceDirection) {
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unsafe { gl::FrontFace(dir) }
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}
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/// Type is a type of data used by various operations.
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pub type Type = u32;
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pub const UNSIGNED_BYTE: Type = gl::UNSIGNED_BYTE;
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pub const UNSIGNED_SHORT: Type = gl::UNSIGNED_SHORT;
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pub const UNSIGNED_INT: Type = gl::UNSIGNED_INT;
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pub const SHORT: Type = gl::SHORT;
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pub const FLOAT: Type = gl::FLOAT;
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/// TextureTarget is a target were a texture can be bound to
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pub type TextureTarget = u32;
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pub const TEXTURE_2D: TextureTarget = gl::TEXTURE_2D;
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pub const TEXTURE_2D_MULTISAMPLE: TextureTarget = gl::TEXTURE_2D_MULTISAMPLE;
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pub const TEXTURE_2D_ARRAY: TextureTarget = gl::TEXTURE_2D_ARRAY;
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pub const TEXTURE_3D: TextureTarget = gl::TEXTURE_3D;
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/// TextureFormat is the format of a texture either internally or
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/// to be uploaded.
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pub type TextureFormat = u32;
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pub const RED: TextureFormat = gl::RED;
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pub const RGB: TextureFormat = gl::RGB;
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pub const RGBA: TextureFormat = gl::RGBA;
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pub const RGBA8: TextureFormat = gl::RGBA8;
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pub const RGBA16F: TextureFormat = gl::RGBA16F;
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pub const R16F: TextureFormat = gl::R16F;
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pub const DEPTH_COMPONENT24: TextureFormat = gl::DEPTH_COMPONENT24;
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pub const DEPTH_COMPONENT: TextureFormat = gl::DEPTH_COMPONENT;
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/// TextureParameter is a parameter that can be read or set on a texture.
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pub type TextureParameter = u32;
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pub const TEXTURE_MIN_FILTER: TextureParameter = gl::TEXTURE_MIN_FILTER;
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pub const TEXTURE_MAG_FILTER: TextureParameter = gl::TEXTURE_MAG_FILTER;
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pub const TEXTURE_WRAP_S: TextureParameter = gl::TEXTURE_WRAP_S;
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pub const TEXTURE_WRAP_T: TextureParameter = gl::TEXTURE_WRAP_T;
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pub const TEXTURE_MAX_LEVEL: TextureParameter = gl::TEXTURE_MAX_LEVEL;
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/// TextureValue is a value that be set on a texture's parameter.
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pub type TextureValue = i32;
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pub const NEAREST: TextureValue = gl::NEAREST as TextureValue;
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pub const LINEAR: TextureValue = gl::LINEAR as TextureValue;
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pub const LINEAR_MIPMAP_LINEAR: TextureValue = gl::LINEAR_MIPMAP_LINEAR as TextureValue;
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pub const LINEAR_MIPMAP_NEAREST: TextureValue = gl::LINEAR_MIPMAP_NEAREST as TextureValue;
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pub const NEAREST_MIPMAP_NEAREST: TextureValue = gl::NEAREST_MIPMAP_NEAREST as TextureValue;
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pub const NEAREST_MIPMAP_LINEAR: TextureValue = gl::NEAREST_MIPMAP_LINEAR as TextureValue;
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pub const CLAMP_TO_EDGE: TextureValue = gl::CLAMP_TO_EDGE as TextureValue;
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/// Texture is a buffer of data used by fragment shaders.
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pub struct Texture(u32);
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impl Texture {
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// Allocates a new texture.
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pub fn new() -> Texture {
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let mut t = Texture(0);
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unsafe {
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gl::GenTextures(1, &mut t.0);
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}
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t
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}
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/// Binds the texture to the passed target.
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pub fn bind(&self, target: TextureTarget) {
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unsafe {
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gl::BindTexture(target, self.0);
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}
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}
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pub fn get_pixels(&self,
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target: TextureTarget,
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level: i32,
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format: TextureFormat,
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ty: Type,
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pixels: &mut [u8]) {
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unsafe {
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gl::GetTexImage(target,
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level,
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format,
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ty,
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pixels.as_mut_ptr() as *mut gl::types::GLvoid);
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}
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}
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pub fn image_3d(&self,
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target: TextureTarget,
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level: i32,
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width: u32,
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height: u32,
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depth: u32,
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format: TextureFormat,
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ty: Type,
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pix: &[u8]) {
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unsafe {
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gl::TexImage3D(target,
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level,
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format as i32,
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width as i32,
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height as i32,
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depth as i32,
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0,
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format,
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ty,
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pix.as_ptr() as *const gl::types::GLvoid);
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}
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}
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pub fn sub_image_3d(&self,
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target: TextureTarget,
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level: i32,
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x: u32,
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y: u32,
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z: u32,
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width: u32,
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height: u32,
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depth: u32,
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format: TextureFormat,
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ty: Type,
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pix: &[u8]) {
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unsafe {
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gl::TexSubImage3D(target,
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level,
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x as i32,
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y as i32,
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z as i32,
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width as i32,
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height as i32,
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depth as i32,
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format,
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ty,
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pix.as_ptr() as *const gl::types::GLvoid);
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}
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}
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pub fn set_parameter(&self,
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target: TextureTarget,
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param: TextureParameter,
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value: TextureValue) {
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unsafe {
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gl::TexParameteri(target, param, value);
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}
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}
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}
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impl Drop for Texture {
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fn drop(&mut self) {
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unsafe {
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gl::DeleteTextures(1, &self.0);
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}
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}
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}
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pub type ShaderType = u32;
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pub const VERTEX_SHADER: ShaderType = gl::VERTEX_SHADER;
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pub const FRAGMENT_SHADER: ShaderType = gl::FRAGMENT_SHADER;
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pub const GEOMETRY_SHADER: ShaderType = gl::GEOMETRY_SHADER;
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pub type ShaderParameter = u32;
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pub const COMPILE_STATUS: ShaderParameter = gl::COMPILE_STATUS;
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pub const INFO_LOG_LENGTH: ShaderParameter = gl::INFO_LOG_LENGTH;
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pub struct Program(u32);
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impl Program {
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pub fn new() -> Program {
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Program(unsafe { gl::CreateProgram() })
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}
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pub fn attach_shader(&self, shader: Shader) {
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unsafe {
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gl::AttachShader(self.0, shader.0);
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}
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}
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pub fn link(&self) {
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unsafe {
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gl::LinkProgram(self.0);
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}
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}
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pub fn use_program(&self) {
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unsafe {
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gl::UseProgram(self.0);
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}
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}
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pub fn uniform_location(&self, name: &str) -> Uniform {
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Uniform(unsafe {
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gl::GetUniformLocation(self.0, ffi::CString::new(name).unwrap().as_ptr())
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})
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}
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pub fn attribute_location(&self, name: &str) -> Attribute {
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Attribute(unsafe {
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gl::GetAttribLocation(self.0, ffi::CString::new(name).unwrap().as_ptr())
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})
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}
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}
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impl Drop for Program {
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fn drop(&mut self) {
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unsafe {
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gl::DeleteProgram(self.0);
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}
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}
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}
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pub struct Shader(u32);
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impl Shader {
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pub fn new(ty: ShaderType) -> Shader {
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Shader(unsafe { gl::CreateShader(ty) })
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}
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pub fn set_source(&self, src: &str) {
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unsafe {
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gl::ShaderSource(self.0,
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1,
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&ffi::CString::new(src).unwrap().as_ptr(),
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ptr::null());
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}
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}
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pub fn compile(&self) {
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unsafe {
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gl::CompileShader(self.0);
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}
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}
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pub fn get_parameter(&self, param: ShaderParameter) -> i32 {
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let mut ret: i32 = 0;
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unsafe {
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gl::GetShaderiv(self.0, param, &mut ret);
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}
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ret
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}
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pub fn get_info_log(&self) -> String {
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let len = self.get_parameter(INFO_LOG_LENGTH);
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let mut data = Vec::<u8>::with_capacity(len as usize);
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unsafe {
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data.set_len(len as usize);
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gl::GetShaderInfoLog(self.0, len, ptr::null_mut(), data.as_mut_ptr() as *mut i8);
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}
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String::from_utf8(data).unwrap()
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}
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}
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pub struct Uniform(i32);
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impl Uniform {
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pub fn set_int(&self, val: i32) {
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unsafe {
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gl::Uniform1i(self.0, val);
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}
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}
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pub fn set_int3(&self, x: i32, y: i32, z: i32) {
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unsafe {
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gl::Uniform3i(self.0, x, y, z);
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}
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}
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pub fn set_float(&self, val: f32) {
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unsafe {
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gl::Uniform1f(self.0, val);
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}
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}
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pub fn set_float2(&self, x: f32, y: f32) {
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unsafe {
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gl::Uniform2f(self.0, x, y);
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}
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}
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pub fn set_float3(&self, x: f32, y: f32, z: f32) {
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unsafe {
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gl::Uniform3f(self.0, x, y, z);
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}
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}
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pub fn set_float4(&self, x: f32, y: f32, z: f32, w: f32) {
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unsafe {
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gl::Uniform4f(self.0, x, y, z, w);
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}
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}
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}
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pub struct Attribute(i32);
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impl Attribute {
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pub fn enable(&self) {
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unsafe {
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gl::EnableVertexAttribArray(self.0 as u32);
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}
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}
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pub fn disable(&self) {
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unsafe {
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gl::DisableVertexAttribArray(self.0 as u32);
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}
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}
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pub fn vertex_pointer(&self, size: i32, ty: Type, normalized: bool, stride: i32, offset: i32) {
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unsafe {
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gl::VertexAttribPointer(self.0 as u32,
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size,
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ty,
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normalized as u8,
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stride,
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offset as *const gl::types::GLvoid);
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}
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}
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pub fn vertex_pointer_int(&self, size: i32, ty: Type, stride: i32, offset: i32) {
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unsafe {
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gl::VertexAttribIPointer(self.0 as u32,
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size,
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ty,
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stride,
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offset as *const gl::types::GLvoid);
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}
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}
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}
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// VertexArray is used to store state needed to render vertices.
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// This includes buffers, the format of the buffers and enabled
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// attributes.
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pub struct VertexArray(u32);
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impl VertexArray {
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/// Allocates a new VertexArray.
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pub fn new() -> VertexArray {
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let mut va = VertexArray(0);
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unsafe {
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gl::GenVertexArrays(1, &mut va.0);
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}
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va
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}
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/// Marks the VertexArray as the currently active one, this
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/// means buffers/the format of the buffers etc will be bound to
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/// this VertexArray.
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pub fn bind(&self) {
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unsafe {
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gl::BindVertexArray(self.0);
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}
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}
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}
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impl Drop for VertexArray {
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fn drop(&mut self) {
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unsafe {
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gl::DeleteVertexArrays(1, &self.0);
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}
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self.0 = 0;
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}
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}
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/// BufferTarget is a target for a buffer to be bound to.
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pub type BufferTarget = u32;
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pub const ARRAY_BUFFER: BufferTarget = gl::ARRAY_BUFFER;
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pub const ELEMENT_ARRAY_BUFFER: BufferTarget = gl::ELEMENT_ARRAY_BUFFER;
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/// BufferUsage states how a buffer is going to be used by the program.
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pub type BufferUsage = u32;
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|
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/// Marks the buffer as 'not going to change' after the
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|
/// initial data upload to be rendered by the gpu.
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pub const STATIC_DRAW: BufferUsage = gl::STATIC_DRAW;
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/// Marks the buffer as 'changed frequently' during the
|
|
/// course of the program whilst being rendered by the gpu.
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|
pub const DYNAMIC_DRAW: BufferUsage = gl::DYNAMIC_DRAW;
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/// Marks the buffer as 'changed every frame' whilst being
|
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/// rendered by the gpu.
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pub const STREAM_DRAW: BufferUsage = gl::STREAM_DRAW;
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|
|
|
/// Access states how a value will be accesed by the program.
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|
pub type Access = u32;
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|
|
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/// States that the returned value will only be read.
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|
pub const READ_ONLY: Access = gl::READ_ONLY;
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/// States that the returned value will only be written
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|
/// to.
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|
pub const WRITE_ONLY: Access = gl::WRITE_ONLY;
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|
|
|
/// Buffer is a storage for vertex data.
|
|
pub struct Buffer(u32);
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|
|
|
impl Buffer {
|
|
/// Allocates a new Buffer.
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|
pub fn new() -> Buffer {
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|
let mut b = Buffer(0);
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|
unsafe {
|
|
gl::GenBuffers(1, &mut b.0);
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|
}
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|
b
|
|
}
|
|
|
|
/// Makes the buffer the currently active one for the given target.
|
|
/// This will allow it to be the source of operations that act on a buffer
|
|
/// (Data, Map etc).
|
|
pub fn bind(&self, target: BufferTarget) {
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|
unsafe {
|
|
gl::BindBuffer(target, self.0);
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|
}
|
|
}
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|
|
|
pub fn set_data(&self, target: BufferTarget, data: &[u8], usage: BufferUsage) {
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|
unsafe {
|
|
gl::BufferData(target,
|
|
data.len() as i64,
|
|
data.as_ptr() as *const gl::types::GLvoid,
|
|
usage);
|
|
}
|
|
}
|
|
|
|
/// Maps the memory in the buffer on the gpu to memory which the program
|
|
/// can access. The access flag will specify how the program plans to use the
|
|
/// returned data. It'll unmap itself once the returned value is dropped.
|
|
///
|
|
/// Warning: the passed length value is not checked in anyway so it is
|
|
/// possible to overrun the memory. It is up to the program to ensure this
|
|
/// length is valid.
|
|
pub fn map(&self, target: BufferTarget, access: Access, length: usize) -> MappedBuffer {
|
|
unsafe {
|
|
MappedBuffer {
|
|
inner: Vec::from_raw_parts(gl::MapBuffer(target, access) as *mut u8, 0, length),
|
|
target: target,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Drop for Buffer {
|
|
fn drop(&mut self) {
|
|
unsafe {
|
|
gl::DeleteBuffers(1, &self.0);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct MappedBuffer {
|
|
inner: Vec<u8>,
|
|
target: BufferTarget,
|
|
}
|
|
|
|
impl Deref for MappedBuffer {
|
|
type Target = Vec<u8>;
|
|
|
|
fn deref(&self) -> &Self::Target {
|
|
&self.inner
|
|
}
|
|
}
|
|
|
|
impl DerefMut for MappedBuffer {
|
|
fn deref_mut(&mut self) -> &mut Self::Target {
|
|
&mut self.inner
|
|
}
|
|
}
|
|
|
|
impl Drop for MappedBuffer {
|
|
fn drop(&mut self) {
|
|
unsafe {
|
|
gl::UnmapBuffer(self.target);
|
|
}
|
|
mem::forget(mem::replace(&mut self.inner, Vec::new()));
|
|
}
|
|
}
|