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LibGL+LibGPU+LibSoftGPU: Implement and expose glClipPlane

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This commit implements glClipPlane and its supporting calls, backed
by new support for user-defined clip planes in the software GPU clipper.

This fixes some visual bugs seen in the Quake III port, in which mirrors
would only reflect correctly from close distances.
This commit is contained in:
RKBethke 2022-05-06 09:40:55 +00:00 • committed by Linus Groh
parent bc2f738a84
commit 0836912a6d
14 changed files with 193 additions and 63 deletions
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57
Userland/Libraries/LibGL/ClipPlanes.cpp Normal file
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/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
* Copyright (c) 2022, Jelle Raaijmakers <jelle@gmta.nl>
* Copyright (c) 2022, Ryan Bethke <ryanbethke11@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <LibGL/GLContext.h>
namespace GL {
void GLContext::gl_clip_plane(GLenum plane, GLdouble const* equation)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_clip_plane, plane, equation);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF((plane < GL_CLIP_PLANE0) || (plane > GL_CLIP_PLANE5), GL_INVALID_ENUM);
auto plane_idx = static_cast<size_t>(plane) - GL_CLIP_PLANE0;
auto eqn = FloatVector4(equation[0], equation[1], equation[2], equation[3]);
m_clip_plane_attributes.eye_clip_plane[plane_idx] = m_model_view_matrix * eqn;
m_clip_planes_dirty = true;
}
void GLContext::gl_get_clip_plane(GLenum plane, GLdouble* equation)
{
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF((plane < GL_CLIP_PLANE0) || (plane > GL_CLIP_PLANE5), GL_INVALID_ENUM);
auto plane_idx = static_cast<size_t>(plane) - GL_CLIP_PLANE0;
equation[0] = static_cast<GLdouble>(m_clip_plane_attributes.eye_clip_plane[plane_idx][0]);
equation[1] = static_cast<GLdouble>(m_clip_plane_attributes.eye_clip_plane[plane_idx][1]);
equation[2] = static_cast<GLdouble>(m_clip_plane_attributes.eye_clip_plane[plane_idx][2]);
equation[3] = static_cast<GLdouble>(m_clip_plane_attributes.eye_clip_plane[plane_idx][3]);
}
void GLContext::sync_clip_planes()
{
if (!m_clip_planes_dirty)
return;
m_clip_planes_dirty = false;
// TODO: Replace magic number 6 with device-dependent constant
Vector<FloatVector4, 6> user_clip_planes;
for (size_t plane_idx = 0; plane_idx < 6; ++plane_idx) {
if ((m_clip_plane_attributes.enabled & (1 << plane_idx)) != 0u) {
user_clip_planes.append(m_clip_plane_attributes.eye_clip_plane[plane_idx]);
}
}
m_rasterizer->set_clip_planes(user_clip_planes);
}
}