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LibGL: Implement glStencil* functions

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This implements the context state for stencil testing functions and
operations. No rasterization is implemented.
This commit is contained in:
Jelle Raaijmakers 2021-12-01 15:21:00 +01:00 • committed by Andreas Kling
parent 729349ce78
commit ea6bcda79c
7 changed files with 135 additions and 1 deletions
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68
Userland/Libraries/LibGL/SoftwareGLContext.cpp
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@ -2172,6 +2172,74 @@ void SoftwareGLContext::gl_scissor(GLint x, GLint y, GLsizei width, GLsizei heig
m_rasterizer.set_options(options);
}
void SoftwareGLContext::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);
// FIXME: "ref is clamped to the range 02^n - 1 , where n is the number of bitplanes in the stencil buffer"
StencilFunctionOptions new_options = { func, ref, mask };
if (face == GL_FRONT || face == GL_FRONT_AND_BACK)
m_stencil_frontfacing_func = new_options;
if (face == GL_BACK || face == GL_FRONT_AND_BACK)
m_stencil_backfacing_func = new_options;
}
void SoftwareGLContext::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);
RETURN_WITH_ERROR_IF(!(sfail == GL_KEEP
|| sfail == GL_ZERO
|| sfail == GL_REPLACE
|| sfail == GL_INCR
|| sfail == GL_INCR_WRAP
|| sfail == GL_DECR
|| sfail == GL_DECR_WRAP
|| sfail == GL_INVERT),
GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(dpfail == GL_KEEP
|| dpfail == GL_ZERO
|| dpfail == GL_REPLACE
|| dpfail == GL_INCR
|| dpfail == GL_INCR_WRAP
|| dpfail == GL_DECR
|| dpfail == GL_DECR_WRAP
|| dpfail == GL_INVERT),
GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(dppass == GL_KEEP
|| dppass == GL_ZERO
|| dppass == GL_REPLACE
|| dppass == GL_INCR
|| dppass == GL_INCR_WRAP
|| dppass == GL_DECR
|| dppass == GL_DECR_WRAP
|| dppass == GL_INVERT),
GL_INVALID_ENUM);
StencilOperationOptions new_options = { sfail, dpfail, dppass };
if (face == GL_FRONT || face == GL_FRONT_AND_BACK)
m_stencil_frontfacing_op = new_options;
if (face == GL_BACK || face == GL_FRONT_AND_BACK)
m_stencil_backfacing_op = new_options;
}
void SoftwareGLContext::present()
{
m_rasterizer.blit_to(*m_frontbuffer);