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use skia;
use euclid::size::Size2D;
use gleam::gl;
use std::ffi::CString;
#[cfg(target_os="macos")]
pub use gl_rasterization_context_cgl::GLRasterizationContext;
#[cfg(target_os="linux")]
pub use gl_rasterization_context_glx::GLRasterizationContext;
#[cfg(target_os="android")]
pub use gl_rasterization_context_android::GLRasterizationContext;
#[cfg(target_os="windows")]
pub use gl_rasterization_context_wgl::GLRasterizationContext;
fn clear_gl_errors() {
let mut error = gl::get_error();
while error != gl::NO_ERROR {
error = gl::get_error();
}
}
#[cfg(not(target_os = "android"))]
fn create_and_bind_depth_stencil_buffer(gl_interface: skia::SkiaGrGLInterfaceRef,
size: Size2D<i32>)
-> gl::GLuint {
unsafe {
let ext_extension_string = CString::new("GL_EXT_packed_depth_stencil").unwrap();
let arb_extension_string = CString::new("GL_ARB_framebuffer_object").unwrap();
let supports_depth_stencil =
skia::SkiaGrGLInterfaceGLVersionGreaterThanOrEqualTo(gl_interface, 3, 0) ||
skia::SkiaGrGLInterfaceHasExtension(gl_interface, ext_extension_string.as_ptr()) ||
skia::SkiaGrGLInterfaceHasExtension(gl_interface, arb_extension_string.as_ptr());
create_and_bind_depth_stencil_buffer_with_formats(supports_depth_stencil,
gl::DEPTH_STENCIL,
gl::STENCIL_INDEX,
size)
}
}
#[cfg(target_os = "android")]
fn create_and_bind_depth_stencil_buffer(gl_interface: skia::SkiaGrGLInterfaceRef,
size: Size2D<i32>)
-> gl::GLuint {
unsafe {
let oes_extension_string = CString::new("GL_OES_packed_depth_stencil").unwrap();
let supports_depth_stencil =
skia::SkiaGrGLInterfaceHasExtension(gl_interface, oes_extension_string.as_ptr());
const GL_DEPTH24_STENCIL8_OES: u32 = 0x88F0;
create_and_bind_depth_stencil_buffer_with_formats(supports_depth_stencil,
GL_DEPTH24_STENCIL8_OES,
gl::STENCIL_INDEX8,
size)
}
}
fn create_and_bind_depth_stencil_buffer_with_formats(supports_depth_stencil: bool,
depth_stencil_format: gl::GLenum,
stencil_format: gl::GLenum,
size: Size2D<i32>)
-> gl::GLuint {
let depth_stencil_renderbuffer_id = gl::gen_renderbuffers(1)[0];
gl::bind_renderbuffer(gl::RENDERBUFFER, depth_stencil_renderbuffer_id);
unsafe {
if supports_depth_stencil {
gl::RenderbufferStorage(gl::RENDERBUFFER,
depth_stencil_format,
size.width,
size.height);
gl::FramebufferRenderbuffer(gl::FRAMEBUFFER,
gl::DEPTH_ATTACHMENT,
gl::RENDERBUFFER,
depth_stencil_renderbuffer_id);
} else {
gl::RenderbufferStorage(gl::RENDERBUFFER, stencil_format, size.width, size.height);
}
gl::FramebufferRenderbuffer(gl::FRAMEBUFFER,
gl::STENCIL_ATTACHMENT,
gl::RENDERBUFFER,
depth_stencil_renderbuffer_id);
}
depth_stencil_renderbuffer_id
}
pub fn setup_framebuffer<F>(texture_target: gl::GLenum,
size: Size2D<i32>,
gl_interface: skia::SkiaGrGLInterfaceRef,
set_texture_image: F)
-> Option<(gl::GLuint, gl::GLuint, gl::GLuint)>
where F: Fn() {
let (framebuffer_id, texture_id, depth_stencil_renderbuffer_id) =
start_framebuffer_setup(texture_target, size, gl_interface);
if !finish_framebuffer_setup(size, set_texture_image) {
destroy_framebuffer(framebuffer_id, texture_id, depth_stencil_renderbuffer_id);
return None;
}
Some((framebuffer_id, texture_id, depth_stencil_renderbuffer_id))
}
pub fn start_framebuffer_setup(texture_target: gl::GLenum,
size: Size2D<i32>,
gl_interface: skia::SkiaGrGLInterfaceRef)
-> (gl::GLuint, gl::GLuint, gl::GLuint) {
clear_gl_errors();
let framebuffer_id = gl::gen_framebuffers(1)[0];
gl::bind_framebuffer(gl::FRAMEBUFFER, framebuffer_id);
let texture_id = gl::gen_textures(1)[0];
gl::bind_texture(texture_target, texture_id);
gl::tex_parameter_i(texture_target, gl::TEXTURE_WRAP_S, gl::CLAMP_TO_EDGE as gl::GLint);
gl::tex_parameter_i(texture_target, gl::TEXTURE_WRAP_T, gl::CLAMP_TO_EDGE as gl::GLint);
gl::tex_parameter_i(texture_target, gl::TEXTURE_MAG_FILTER, gl::NEAREST as gl::GLint);
gl::tex_parameter_i(texture_target, gl::TEXTURE_MIN_FILTER, gl::NEAREST as gl::GLint);
gl::framebuffer_texture_2d(gl::FRAMEBUFFER,
gl::COLOR_ATTACHMENT0,
texture_target,
texture_id, 0);
let depth_stencil_renderbuffer_id = create_and_bind_depth_stencil_buffer(gl_interface,
size);
(framebuffer_id, texture_id, depth_stencil_renderbuffer_id)
}
pub fn finish_framebuffer_setup<F>(size: Size2D<i32>,
set_texture_image: F)
-> bool
where F: Fn() {
set_texture_image();
gl::viewport(0, 0, size.width, size.height);
unsafe {
gl::get_error() == gl::NO_ERROR &&
gl::CheckFramebufferStatus(gl::FRAMEBUFFER) == gl::FRAMEBUFFER_COMPLETE
}
}
pub fn destroy_framebuffer(framebuffer_id: gl::GLuint,
texture_id: gl::GLuint,
depth_stencil_renderbuffer_id: gl::GLuint) {
gl::delete_framebuffers(&[framebuffer_id]);
gl::delete_textures(&[texture_id]);
gl::delete_renderbuffers(&[depth_stencil_renderbuffer_id]);
}