121 lines
3.1 KiB
Rust
121 lines
3.1 KiB
Rust
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/*
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* This file is the single point of definition of the opengl shaders
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* and their indexes.
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*
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* The opengl_programs!() macro must call make_program!() in the correct
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* order matching the indices stored in the BUFFER_* constants, if it
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* does not, things will be drawn on screen with wrong colors.
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*/
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// create a set of shaders for various loading types
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macro_rules! make_program(
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($display: expr, $fragment_shader:expr) => {
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program!($display,
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100 => {
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vertex: ::shaders::VERTEX_SHADER,
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fragment: $fragment_shader,
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},
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).unwrap()
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}
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);
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#[macro_escape]
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macro_rules! opengl_programs(
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($display: expr) => {
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[
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make_program!($display, ::shaders::FRAGMENT_SHADER_RGBA),
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make_program!($display, ::shaders::FRAGMENT_SHADER_ABGR),
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make_program!($display, ::shaders::FRAGMENT_SHADER_XBGR),
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make_program!($display, ::shaders::FRAGMENT_SHADER_BGRA),
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make_program!($display, ::shaders::FRAGMENT_SHADER_BGRX),
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]
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}
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);
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/*
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* OpenGL Shaders
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*/
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pub const VERTEX_SHADER: &'static str = r#"
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#version 100
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uniform lowp mat4 matrix;
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attribute lowp vec2 position;
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attribute lowp vec2 tex_coords;
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varying lowp vec2 v_tex_coords;
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void main() {
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gl_Position = matrix * vec4(position, 0.0, 1.0);
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v_tex_coords = tex_coords;
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}"#;
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pub const FRAGMENT_COUNT: usize = 5;
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pub const BUFFER_RGBA: usize = 0;
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pub const FRAGMENT_SHADER_RGBA: &'static str = r#"
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#version 100
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uniform lowp sampler2D tex;
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varying lowp vec2 v_tex_coords;
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void main() {
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lowp vec4 color = texture2D(tex, v_tex_coords);
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gl_FragColor.r = color.x;
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gl_FragColor.g = color.y;
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gl_FragColor.b = color.z;
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gl_FragColor.a = color.w;
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}
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"#;
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pub const BUFFER_ABGR: usize = 1;
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pub const FRAGMENT_SHADER_ABGR: &'static str = r#"
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#version 100
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uniform lowp sampler2D tex;
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varying lowp vec2 v_tex_coords;
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void main() {
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lowp vec4 color = texture2D(tex, v_tex_coords);
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gl_FragColor.r = color.w;
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gl_FragColor.g = color.z;
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gl_FragColor.b = color.y;
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gl_FragColor.a = color.x;
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}
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"#;
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pub const BUFFER_XBGR: usize = 2;
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pub const FRAGMENT_SHADER_XBGR: &'static str = r#"
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#version 100
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uniform lowp sampler2D tex;
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varying lowp vec2 v_tex_coords;
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void main() {
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lowp vec4 color = texture2D(tex, v_tex_coords);
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gl_FragColor.r = color.w;
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gl_FragColor.g = color.z;
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gl_FragColor.b = color.y;
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gl_FragColor.a = 1.0;
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}
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"#;
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pub const BUFFER_BGRA: usize = 3;
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pub const FRAGMENT_SHADER_BGRA: &'static str = r#"
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#version 100
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uniform lowp sampler2D tex;
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varying lowp vec2 v_tex_coords;
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void main() {
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lowp vec4 color = texture2D(tex, v_tex_coords);
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gl_FragColor.r = color.z;
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gl_FragColor.g = color.y;
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gl_FragColor.b = color.x;
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gl_FragColor.a = color.w;
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}
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"#;
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pub const BUFFER_BGRX: usize = 4;
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pub const FRAGMENT_SHADER_BGRX: &'static str = r#"
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#version 100
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uniform lowp sampler2D tex;
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varying lowp vec2 v_tex_coords;
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void main() {
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lowp vec4 color = texture2D(tex, v_tex_coords);
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gl_FragColor.r = color.z;
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gl_FragColor.g = color.y;
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gl_FragColor.b = color.x;
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gl_FragColor.a = 1.0;
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}
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"#;
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