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- /*
- * Copyright (c) 2022, Luke Wilde <lukew@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/Debug.h>
- #include <LibGL/GLContext.h>
- #include <LibWeb/HTML/HTMLCanvasElement.h>
- #include <LibWeb/WebGL/WebGLRenderingContextBase.h>
- namespace Web::WebGL {
- WebGLRenderingContextBase::WebGLRenderingContextBase(HTML::HTMLCanvasElement& canvas_element, NonnullOwnPtr<GL::GLContext> context, WebGLContextAttributes context_creation_parameters, WebGLContextAttributes actual_context_parameters)
- : m_canvas_element(canvas_element)
- , m_context(move(context))
- , m_context_creation_parameters(move(context_creation_parameters))
- , m_actual_context_parameters(move(actual_context_parameters))
- {
- }
- WebGLRenderingContextBase::~WebGLRenderingContextBase() = default;
- void WebGLRenderingContextBase::present()
- {
- if (!m_should_present)
- return;
- m_should_present = false;
- // "Before the drawing buffer is presented for compositing the implementation shall ensure that all rendering operations have been flushed to the drawing buffer."
- // FIXME: Is this the operation it means?
- m_context->gl_flush();
- m_context->present();
- // "By default, after compositing the contents of the drawing buffer shall be cleared to their default values, as shown in the table above.
- // This default behavior can be changed by setting the preserveDrawingBuffer attribute of the WebGLContextAttributes object.
- // If this flag is true, the contents of the drawing buffer shall be preserved until the author either clears or overwrites them."
- if (!m_context_creation_parameters.preserve_drawing_buffer) {
- auto current_clear_color = m_context->current_clear_color();
- auto current_clear_depth = m_context->current_clear_depth();
- auto current_clear_stencil = m_context->current_clear_stencil();
- // The implicit clear value for the color buffer is (0, 0, 0, 0)
- m_context->gl_clear_color(0, 0, 0, 0);
- // The implicit clear value for the depth buffer is 1.0.
- m_context->gl_clear_depth(1.0);
- // The implicit clear value for the stencil buffer is 0.
- m_context->gl_clear_stencil(0);
- m_context->gl_clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
- // Restore the clear values.
- m_context->gl_clear_color(current_clear_color[0], current_clear_color[1], current_clear_color[2], current_clear_color[3]);
- m_context->gl_clear_depth(current_clear_depth);
- m_context->gl_clear_stencil(current_clear_stencil);
- }
- }
- void WebGLRenderingContextBase::needs_to_present()
- {
- m_should_present = true;
- if (!m_canvas_element)
- return;
- if (!m_canvas_element->layout_node())
- return;
- m_canvas_element->layout_node()->set_needs_display();
- }
- Optional<Vector<String>> WebGLRenderingContextBase::get_supported_extensions() const
- {
- if (m_context_lost)
- return Optional<Vector<String>> {};
- dbgln_if(WEBGL_CONTEXT_DEBUG, "WebGLRenderingContextBase::get_supported_extensions()");
- // FIXME: We don't currently support any extensions.
- return Vector<String> {};
- }
- JS::Object* WebGLRenderingContextBase::get_extension(String const& name) const
- {
- if (m_context_lost)
- return nullptr;
- dbgln_if(WEBGL_CONTEXT_DEBUG, "WebGLRenderingContextBase::get_extension(name='{}')", name);
- // FIXME: We don't currently support any extensions.
- return nullptr;
- }
- void WebGLRenderingContextBase::clear(GLbitfield mask)
- {
- if (m_context_lost)
- return;
- dbgln_if(WEBGL_CONTEXT_DEBUG, "WebGLRenderingContextBase::clear(mask=0x{:08x})", mask);
- m_context->gl_clear(mask);
- // FIXME: This should only be done if this is targeting the front buffer.
- needs_to_present();
- }
- void WebGLRenderingContextBase::clear_color(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha)
- {
- if (m_context_lost)
- return;
- dbgln_if(WEBGL_CONTEXT_DEBUG, "WebGLRenderingContextBase::clear_color(red={}, green={}, blue={}, alpha={})", red, green, blue, alpha);
- m_context->gl_clear_color(red, green, blue, alpha);
- }
- }
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