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serenity/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.h
Luke Wilde 0ec8a19a34 LibWeb/WebGL: Forward the render context ref count to HTMLCanvasElement
This allows HTMLCanvasElement and WebGL rendering contexts to share
their lifetime, as JS allows them to arbitrarily access them at any
time and WebGLRCB.canvas expects a non-null return value.
2022-06-27 22:54:41 +01:00

95 lines
3.3 KiB
C++

/*
* Copyright (c) 2022, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/RefCountForwarder.h>
#include <AK/WeakPtr.h>
#include <AK/Weakable.h>
#include <LibGL/GLContext.h>
#include <LibWeb/Forward.h>
#include <LibWeb/WebGL/WebGLContextAttributes.h>
namespace Web::WebGL {
class WebGLRenderingContextBase
: public RefCountForwarder<HTML::HTMLCanvasElement>
, public Weakable<WebGLRenderingContextBase> {
public:
virtual ~WebGLRenderingContextBase();
void present();
bool is_context_lost() const;
Optional<Vector<String>> get_supported_extensions() const;
JS::Object* get_extension(String const& name) const;
void active_texture(GLenum texture);
void clear(GLbitfield mask);
void clear_color(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
void clear_depth(GLclampf depth);
void clear_stencil(GLint s);
void color_mask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
void cull_face(GLenum mode);
void depth_func(GLenum func);
void depth_mask(GLboolean mask);
void depth_range(GLclampf z_near, GLclampf z_far);
void finish();
void flush();
void front_face(GLenum mode);
GLenum get_error();
void line_width(GLfloat width);
void polygon_offset(GLfloat factor, GLfloat units);
void scissor(GLint x, GLint y, GLsizei width, GLsizei height);
void stencil_op(GLenum fail, GLenum zfail, GLenum zpass);
void stencil_op_separate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass);
void viewport(GLint x, GLint y, GLsizei width, GLsizei height);
protected:
WebGLRenderingContextBase(HTML::HTMLCanvasElement& canvas_element, NonnullOwnPtr<GL::GLContext> context, WebGLContextAttributes context_creation_parameters, WebGLContextAttributes actual_context_parameters);
private:
NonnullOwnPtr<GL::GLContext> m_context;
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#context-creation-parameters
// Each WebGLRenderingContext has context creation parameters, set upon creation, in a WebGLContextAttributes object.
WebGLContextAttributes m_context_creation_parameters {};
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#actual-context-parameters
// Each WebGLRenderingContext has actual context parameters, set each time the drawing buffer is created, in a WebGLContextAttributes object.
WebGLContextAttributes m_actual_context_parameters {};
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#webgl-context-lost-flag
// Each WebGLRenderingContext has a webgl context lost flag, which is initially unset.
bool m_context_lost { false };
// WebGL presents its drawing buffer to the HTML page compositor immediately before a compositing operation, but only if at least one of the following has occurred since the previous compositing operation:
// - Context creation
// - Canvas resize
// - clear, drawArrays, or drawElements has been called while the drawing buffer is the currently bound framebuffer
bool m_should_present { true };
GLenum m_error { GL_NO_ERROR };
HTML::HTMLCanvasElement& canvas_element();
HTML::HTMLCanvasElement const& canvas_element() const;
void needs_to_present();
void set_error(GLenum error);
};
}