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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>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGL/GLContext.h>
namespace GL {
void GLContext::gl_clear_stencil(GLint s)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_clear_stencil, s);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
m_clear_stencil = static_cast<u8>(s & ((1 << m_device_info.stencil_bits) - 1));
}
void GLContext::gl_stencil_func_separate(GLenum face, GLenum func, GLint ref, GLuint mask)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_stencil_func_separate, face, func, ref, mask);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(!(face == GL_FRONT || face == GL_BACK || face == GL_FRONT_AND_BACK), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(func == GL_NEVER
|| func == GL_LESS
|| func == GL_LEQUAL
|| func == GL_GREATER
|| func == GL_GEQUAL
|| func == GL_EQUAL
|| func == GL_NOTEQUAL
|| func == GL_ALWAYS),
GL_INVALID_ENUM);
ref = clamp(ref, 0, (1 << m_device_info.stencil_bits) - 1);
StencilFunctionOptions new_options = { func, ref, mask };
if (face == GL_FRONT || face == GL_FRONT_AND_BACK)
m_stencil_function[Face::Front] = new_options;
if (face == GL_BACK || face == GL_FRONT_AND_BACK)
m_stencil_function[Face::Back] = new_options;
m_stencil_configuration_dirty = true;
}
void GLContext::gl_stencil_mask_separate(GLenum face, GLuint mask)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_stencil_mask_separate, face, mask);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
if (face == GL_FRONT || face == GL_FRONT_AND_BACK)
m_stencil_operation[Face::Front].write_mask = mask;
if (face == GL_BACK || face == GL_FRONT_AND_BACK)
m_stencil_operation[Face::Back].write_mask = mask;
m_stencil_configuration_dirty = true;
}
void GLContext::gl_stencil_op_separate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_stencil_op_separate, face, sfail, dpfail, dppass);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(!(face == GL_FRONT || face == GL_BACK || face == GL_FRONT_AND_BACK), GL_INVALID_ENUM);
auto is_valid_op = [](GLenum op) -> bool {
return op == GL_KEEP || op == GL_ZERO || op == GL_REPLACE || op == GL_INCR || op == GL_INCR_WRAP
|| op == GL_DECR || op == GL_DECR_WRAP || op == GL_INVERT;
};
RETURN_WITH_ERROR_IF(!is_valid_op(sfail), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!is_valid_op(dpfail), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!is_valid_op(dppass), GL_INVALID_ENUM);
auto update_stencil_operation = [&](Face face, GLenum sfail, GLenum dpfail, GLenum dppass) {
auto& stencil_operation = m_stencil_operation[face];
stencil_operation.op_fail = sfail;
stencil_operation.op_depth_fail = dpfail;
stencil_operation.op_pass = dppass;
};
if (face == GL_FRONT || face == GL_FRONT_AND_BACK)
update_stencil_operation(Face::Front, sfail, dpfail, dppass);
if (face == GL_BACK || face == GL_FRONT_AND_BACK)
update_stencil_operation(Face::Back, sfail, dpfail, dppass);
m_stencil_configuration_dirty = true;
}
void GLContext::sync_stencil_configuration()
{
if (!m_stencil_configuration_dirty)
return;
m_stencil_configuration_dirty = false;
auto set_device_stencil = [&](GPU::Face face, StencilFunctionOptions func, StencilOperationOptions op) {
GPU::StencilConfiguration device_configuration;
// Stencil test function
auto map_func = [](GLenum func) -> GPU::StencilTestFunction {
switch (func) {
case GL_ALWAYS:
return GPU::StencilTestFunction::Always;
case GL_EQUAL:
return GPU::StencilTestFunction::Equal;
case GL_GEQUAL:
return GPU::StencilTestFunction::GreaterOrEqual;
case GL_GREATER:
return GPU::StencilTestFunction::Greater;
case GL_LESS:
return GPU::StencilTestFunction::Less;
case GL_LEQUAL:
return GPU::StencilTestFunction::LessOrEqual;
case GL_NEVER:
return GPU::StencilTestFunction::Never;
case GL_NOTEQUAL:
return GPU::StencilTestFunction::NotEqual;
}
VERIFY_NOT_REACHED();
};
device_configuration.test_function = map_func(func.func);
device_configuration.reference_value = func.reference_value;
device_configuration.test_mask = func.mask;
// Stencil operation
auto map_operation = [](GLenum operation) -> GPU::StencilOperation {
switch (operation) {
case GL_DECR:
return GPU::StencilOperation::Decrement;
case GL_DECR_WRAP:
return GPU::StencilOperation::DecrementWrap;
case GL_INCR:
return GPU::StencilOperation::Increment;
case GL_INCR_WRAP:
return GPU::StencilOperation::IncrementWrap;
case GL_INVERT:
return GPU::StencilOperation::Invert;
case GL_KEEP:
return GPU::StencilOperation::Keep;
case GL_REPLACE:
return GPU::StencilOperation::Replace;
case GL_ZERO:
return GPU::StencilOperation::Zero;
}
VERIFY_NOT_REACHED();
};
device_configuration.on_stencil_test_fail = map_operation(op.op_fail);
device_configuration.on_depth_test_fail = map_operation(op.op_depth_fail);
device_configuration.on_pass = map_operation(op.op_pass);
device_configuration.write_mask = op.write_mask;
m_rasterizer->set_stencil_configuration(face, device_configuration);
};
set_device_stencil(GPU::Face::Front, m_stencil_function[Face::Front], m_stencil_operation[Face::Front]);
set_device_stencil(GPU::Face::Back, m_stencil_function[Face::Back], m_stencil_operation[Face::Back]);
}
}
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