diff options
Diffstat (limited to 'src/win.rs')
| -rw-r--r-- | src/win.rs | 153 |
1 files changed, 118 insertions, 35 deletions
@@ -652,6 +652,49 @@ pub struct Texture { params: TextureParams, } +impl Texture { + unsafe fn bind(&self) { + gl::BindTexture(gl::TEXTURE_2D, self.id); + } + + unsafe fn set_data(&mut self, data: &[u8], width: usize, height: usize) -> Result<(), String> { + let width = width as GLsizei; + let height = height as GLsizei; + let expected_len = 4 * width * height; + if data.len() as GLsizei != expected_len { + return Err(format!( + "bad data length (expected {}, got {})", + expected_len, + data.len() + )); + } + let params = &self.params; + self.bind(); + gl::TexImage2D( + gl::TEXTURE_2D, + 0, + gl::RGBA as _, + width, + height, + 0, + gl::RGBA, + gl::UNSIGNED_BYTE, + data.as_ptr() as _, + ); + gl::TexParameteri( + gl::TEXTURE_2D, + gl::TEXTURE_MIN_FILTER, + params.min_filter.to_gl(), + ); + gl::TexParameteri( + gl::TEXTURE_2D, + gl::TEXTURE_MAG_FILTER, + params.mag_filter.to_gl(), + ); + Ok(()) + } +} + impl Drop for Texture { fn drop(&mut self) { unsafe { gl::DeleteTextures(1, (&self.id) as *const GLuint) }; @@ -689,6 +732,69 @@ impl Default for TextureParams { } } +#[derive(Clone, Copy)] +pub enum FramebufferAttachment { + // 8 color attachments ought to be enough for anyone. + Color0, + Color1, + Color2, + Color3, + Color4, + Color5, + Color6, + Color7, + Depth, + Stencil, + DepthStencil +} + +impl FramebufferAttachment { + fn to_gl(self) -> GLenum { + use FramebufferAttachment::*; + match self { + Color0 => gl::COLOR_ATTACHMENT0, + Color1 => gl::COLOR_ATTACHMENT1, + Color2 => gl::COLOR_ATTACHMENT2, + Color3 => gl::COLOR_ATTACHMENT3, + Color4 => gl::COLOR_ATTACHMENT4, + Color5 => gl::COLOR_ATTACHMENT5, + Color6 => gl::COLOR_ATTACHMENT6, + Color7 => gl::COLOR_ATTACHMENT7, + Depth => gl::DEPTH_ATTACHMENT, + Stencil => gl::STENCIL_ATTACHMENT, + DepthStencil => gl::DEPTH_STENCIL_ATTACHMENT, + } + } +} + +pub struct Framebuffer { + id: GLuint +} + +impl Framebuffer { + unsafe fn new() -> Self { + let mut id: GLuint = 0; + gl::GenFramebuffers(1, (&mut id) as *mut GLuint); + Self { id } + } + + unsafe fn bind(&self) { + gl::BindTexture(gl::FRAMEBUFFER, self.id); + } + + unsafe fn set_texture(&mut self, attachment: FramebufferAttachment, texture: &Texture) { + self.bind(); + texture.bind(); + gl::FramebufferTexture2D(gl::FRAMEBUFFER, attachment.to_gl(), gl::TEXTURE_2D, texture.id, 0); + } +} + +impl Drop for Framebuffer { + fn drop(&mut self) { + unsafe { gl::DeleteFramebuffers(1, (&self.id) as *const GLuint) }; + } +} + impl Window { pub fn new(title: &str, width: i32, height: i32, shown: bool) -> Result<Self, String> { { @@ -816,6 +922,17 @@ impl Window { pub fn array_attrib4f(&mut self, array: &mut VertexArray, name: &str, offset: usize) -> bool { self.array_attribnf(array, 4, name, offset) } + + pub fn create_framebuffer(&mut self) -> Framebuffer { + unsafe { Framebuffer::new() } + } + + /// Attach texture to framebuffer. + /// In theory this should check that `framebuffer` does not outlive `texture`, + /// but that would be difficult to do in a nice way. + pub fn set_framebuffer_texture(&mut self, framebuffer: &mut Framebuffer, attachment: FramebufferAttachment, texture: &Texture) { + unsafe { framebuffer.set_texture(attachment, texture) }; + } pub fn size(&self) -> (i32, i32) { let mut x = 0; @@ -893,41 +1010,7 @@ impl Window { width: usize, height: usize, ) -> Result<(), String> { - let width = width as GLsizei; - let height = height as GLsizei; - let expected_len = 4 * width * height; - if data.len() as GLsizei != expected_len { - return Err(format!( - "bad data length (expected {}, got {})", - expected_len, - data.len() - )); - } - let params = &texture.params; - unsafe { - gl::BindTexture(gl::TEXTURE_2D, texture.id); - gl::TexImage2D( - gl::TEXTURE_2D, - 0, - gl::RGBA as _, - width, - height, - 0, - gl::RGBA, - gl::UNSIGNED_BYTE, - data.as_ptr() as _, - ); - gl::TexParameteri( - gl::TEXTURE_2D, - gl::TEXTURE_MIN_FILTER, - params.min_filter.to_gl(), - ); - gl::TexParameteri( - gl::TEXTURE_2D, - gl::TEXTURE_MAG_FILTER, - params.mag_filter.to_gl(), - ); - } + unsafe { texture.set_data(data, width, height) }?; Ok(()) } |