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Implement WebGL getFramebufferAttachmentParameter API

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This commit is contained in:
Igor Gutorov 2018-03-14 20:41:36 +02:00
parent f92f0809f8
commit ee5bdbbd8b
10 changed files with 338 additions and 110 deletions
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94
components/script/dom/webglrenderingcontext.rs
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@ -10,6 +10,7 @@ use canvas_traits::webgl::DOMToTextureCommand;
use canvas_traits::webgl::WebGLError::*;
use canvas_traits::webgl::webgl_channel;
use dom::bindings::cell::DomRefCell;
use dom::bindings::codegen::Bindings::WebGL2RenderingContextBinding::WebGL2RenderingContextConstants as WebGL2Constants;
use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::{self, WebGLContextAttributes};
use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextMethods;
@ -33,7 +34,7 @@ use dom::webgl_validations::types::{TexDataType, TexFormat, TexImageTarget};
use dom::webglactiveinfo::WebGLActiveInfo;
use dom::webglbuffer::WebGLBuffer;
use dom::webglcontextevent::WebGLContextEvent;
use dom::webglframebuffer::WebGLFramebuffer;
use dom::webglframebuffer::{WebGLFramebuffer, WebGLFramebufferAttachmentRoot};
use dom::webglprogram::WebGLProgram;
use dom::webglrenderbuffer::WebGLRenderbuffer;
use dom::webglshader::WebGLShader;
@ -1554,6 +1555,10 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.6
fn BindFramebuffer(&self, target: u32, framebuffer: Option<&WebGLFramebuffer>) {
if target == WebGL2Constants::READ_FRAMEBUFFER {
return self.webgl_error(InvalidEnum);
}
if target != constants::FRAMEBUFFER {
return self.webgl_error(InvalidOperation);
}
@ -2297,6 +2302,93 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
}
}
#[allow(unsafe_code)]
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.6
unsafe fn GetFramebufferAttachmentParameter(
&self,
cx: *mut JSContext,
target: u32,
attachment: u32,
pname: u32
) -> JSVal {
// Check if currently bound framebuffer is non-zero as per spec.
if self.bound_framebuffer.get().is_none() {
self.webgl_error(InvalidOperation);
return NullValue();
}
// Note: commented out stuff is for the WebGL2 standard.
let target_matches = match target {
// constants::READ_FRAMEBUFFER |
// constants::DRAW_FRAMEBUFFER => true,
constants::FRAMEBUFFER => true,
_ => false
};
let attachment_matches = match attachment {
// constants::MAX_COLOR_ATTACHMENTS ... gl::COLOR_ATTACHMENT0 |
// constants::BACK |
constants::COLOR_ATTACHMENT0 |
constants::DEPTH_STENCIL_ATTACHMENT |
constants::DEPTH_ATTACHMENT |
constants::STENCIL_ATTACHMENT => true,
_ => false,
};
let pname_matches = match pname {
// constants::FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE |
// constants::FRAMEBUFFER_ATTACHMENT_BLUE_SIZE |
// constants::FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING |
// constants::FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE |
// constants::FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE |
// constants::FRAMEBUFFER_ATTACHMENT_GREEN_SIZE |
// constants::FRAMEBUFFER_ATTACHMENT_RED_SIZE |
// constants::FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE |
// constants::FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER |
constants::FRAMEBUFFER_ATTACHMENT_OBJECT_NAME |
constants::FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE |
constants::FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE |
constants::FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL => true,
_ => false
};
if !target_matches || !attachment_matches || !pname_matches {
self.webgl_error(InvalidEnum);
return NullValue();
}
// From the GLES2 spec:
//
// If the value of FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE is NONE,
// then querying any other pname will generate INVALID_ENUM.
//
// otherwise, return `WebGLRenderbuffer` or `WebGLTexture` dom object
if pname == constants::FRAMEBUFFER_ATTACHMENT_OBJECT_NAME {
// if fb is None, an INVALID_OPERATION is returned
// at the beggining of the function, so `.unwrap()` will never panic
let fb = self.bound_framebuffer.get().unwrap();
if let Some(webgl_attachment) = fb.attachment(attachment) {
match webgl_attachment {
WebGLFramebufferAttachmentRoot::Renderbuffer(rb) => {
rooted!(in(cx) let mut rval = NullValue());
rb.to_jsval(cx, rval.handle_mut());
return rval.get();
},
WebGLFramebufferAttachmentRoot::Texture(texture) => {
rooted!(in(cx) let mut rval = NullValue());
texture.to_jsval(cx, rval.handle_mut());
return rval.get();
},
}
}
self.webgl_error(InvalidEnum);
return NullValue();
}
let (sender, receiver) = webgl_channel().unwrap();
self.send_command(WebGLCommand::GetFramebufferAttachmentParameter(target, attachment, pname, sender));
Int32Value(receiver.recv().unwrap())
}
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.9
fn GetProgramInfoLog(&self, program: Option<&WebGLProgram>) -> Option<DOMString> {
if let Some(program) = program {