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LibGL: Only normalize in glRotate* if possible

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Vectors of length 0 cannot be normalized, so prevent dividing by zero
in the `glRotate*` API. This fixes the skybox rendering of Quake2.
This commit is contained in:
Jelle Raaijmakers 2022-03-10 10:22:32 +01:00 • committed by Andreas Kling
parent 2362cc2943
commit 5d0a64bfde
2 changed files with 6 additions and 5 deletions
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7
Userland/Libraries/LibGL/GLContext.cpp
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@ -594,15 +594,16 @@ void GLContext::gl_mult_matrix(FloatMatrix4x4 const& matrix)
VERIFY_NOT_REACHED();
}
void GLContext::gl_rotate(GLdouble angle, GLdouble x, GLdouble y, GLdouble z)
void GLContext::gl_rotate(GLfloat angle, GLfloat x, GLfloat y, GLfloat z)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_rotate, angle, x, y, z);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
FloatVector3 axis = { (float)x, (float)y, (float)z };
FloatVector3 axis = { x, y, z };
if (axis.length() > 0.f)
axis.normalize();
auto rotation_mat = Gfx::rotation_matrix(axis, static_cast<float>(angle * M_PI * 2 / 360));
auto rotation_mat = Gfx::rotation_matrix(axis, angle * static_cast<float>(M_PI * 2 / 360));
if (m_current_matrix_mode == GL_MODELVIEW)
m_model_view_matrix = m_model_view_matrix * rotation_mat;

2
Userland/Libraries/LibGL/GLContext.h
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@ -70,7 +70,7 @@ public:
void gl_push_matrix();
void gl_pop_matrix();
void gl_mult_matrix(FloatMatrix4x4 const& matrix);
void gl_rotate(GLdouble angle, GLdouble x, GLdouble y, GLdouble z);
void gl_rotate(GLfloat angle, GLfloat x, GLfloat y, GLfloat z);
void gl_scale(GLdouble x, GLdouble y, GLdouble z);
void gl_translate(GLdouble x, GLdouble y, GLdouble z);
void gl_vertex(GLdouble x, GLdouble y, GLdouble z, GLdouble w);