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LibGL: Add back face culling functions

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Adds all needed functions to support back face culling
and implements back face culling in the SoftwareGLContext.
This commit is contained in:
Stephan Unverwerth 2021-04-24 12:09:56 +02:00 • committed by Andreas Kling
parent eff3c8a954
commit e6c0600499
5 changed files with 112 additions and 0 deletions
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64
Userland/Libraries/LibGL/SoftwareGLContext.cpp
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@ -404,6 +404,16 @@ void SoftwareGLContext::gl_end()
(void)(vertexBy);
(void)(vertexCx);
(void)(vertexCy);
if (m_cull_faces) {
bool is_front = (m_front_face == GL_CCW ? area > 0 : area < 0);
if (is_front && (m_culled_sides == GL_FRONT || m_culled_sides == GL_FRONT_AND_BACK))
continue;
if (!is_front && (m_culled_sides == GL_BACK || m_culled_sides == GL_FRONT_AND_BACK))
continue;
}
}
triangle_list.clear();
@ -714,4 +724,58 @@ void SoftwareGLContext::gl_viewport(GLint x, GLint y, GLsizei width, GLsizei hei
m_error = GL_NO_ERROR;
}
void SoftwareGLContext::gl_enable(GLenum capability)
{
if (m_in_draw_state) {
m_error = GL_INVALID_OPERATION;
return;
}
switch (capability) {
case GL_CULL_FACE:
m_cull_faces = true;
break;
default:
m_error = GL_INVALID_ENUM;
break;
}
}
void SoftwareGLContext::gl_disable(GLenum capability)
{
if (m_in_draw_state) {
m_error = GL_INVALID_OPERATION;
return;
}
switch (capability) {
case GL_CULL_FACE:
m_cull_faces = false;
break;
default:
m_error = GL_INVALID_ENUM;
break;
}
}
void SoftwareGLContext::gl_front_face(GLenum face)
{
if (face < GL_CW || face > GL_CCW) {
m_error = GL_INVALID_ENUM;
return;
}
m_front_face = face;
}
void SoftwareGLContext::gl_cull_face(GLenum cull_mode)
{
if (cull_mode < GL_FRONT || cull_mode > GL_FRONT_AND_BACK) {
m_error = GL_INVALID_ENUM;
return;
}
m_culled_sides = cull_mode;
}
}