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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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1
Userland/Libraries/LibGL/CMakeLists.txt
View file

@ -11,6 +11,7 @@ set(SOURCES
GLLights.cpp
GLLists.cpp
GLMat.cpp
GLStencil.cpp
GLTexture.cpp
GLUtils.cpp
GLVert.cpp

10
Userland/Libraries/LibGL/GL/gl.h
View file

@ -192,7 +192,13 @@ extern "C" {
#define GL_UNSIGNED_BYTE 0x1401
// Stencil buffer operations
#define GL_KEEP 0x1E00
#define GL_REPLACE 0x1E01
#define GL_INCR 0x1E02
#define GL_INCR_WRAP 0x8507
#define GL_DECR 0x1E03
#define GL_DECR_WRAP 0x8508
#define GL_INVERT 0x150A
// Texture targets
#define GL_TEXTURE_1D 0x0DE0
@ -439,6 +445,10 @@ GLAPI void glPixelStorei(GLenum pname, GLint param);
GLAPI void glScissor(GLint x, GLint y, GLsizei width, GLsizei height);
GLAPI void glLightf(GLenum light, GLenum pname, GLfloat param);
GLAPI void glLightfv(GLenum light, GLenum pname, GLfloat* param);
GLAPI void glStencilFunc(GLenum func, GLint ref, GLuint mask);
GLAPI void glStencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask);
GLAPI void glStencilOp(GLenum sfail, GLenum dpfail, GLenum dppass);
GLAPI void glStencilOpSeparate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass);
#ifdef __cplusplus
}

2
Userland/Libraries/LibGL/GLContext.h
View file

@ -91,6 +91,8 @@ public:
virtual void gl_fogi(GLenum pname, GLint param) = 0;
virtual void gl_pixel_storei(GLenum pname, GLint param) = 0;
virtual void gl_scissor(GLint x, GLint y, GLsizei width, GLsizei height) = 0;
virtual void gl_stencil_func_separate(GLenum face, GLenum func, GLint ref, GLuint mask) = 0;
virtual void gl_stencil_op_separate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass) = 0;
virtual void present() = 0;
};

30
Userland/Libraries/LibGL/GLStencil.cpp Normal file
View file

@ -0,0 +1,30 @@
/*
* Copyright (c) 2021, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "GL/gl.h"
#include "GLContext.h"
extern GL::GLContext* g_gl_context;
void glStencilFunc(GLenum func, GLint ref, GLuint mask)
{
g_gl_context->gl_stencil_func_separate(GL_FRONT_AND_BACK, func, ref, mask);
}
void glStencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask)
{
g_gl_context->gl_stencil_func_separate(face, func, ref, mask);
}
void glStencilOp(GLenum sfail, GLenum dpfail, GLenum dppass)
{
g_gl_context->gl_stencil_op_separate(GL_FRONT_AND_BACK, sfail, dpfail, dppass);
}
void glStencilOpSeparate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass)
{
g_gl_context->gl_stencil_op_separate(face, sfail, dpfail, dppass);
}

68
Userland/Libraries/LibGL/SoftwareGLContext.cpp
View file

@ -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);

23
Userland/Libraries/LibGL/SoftwareGLContext.h
View file

@ -102,6 +102,8 @@ public:
virtual void gl_fogi(GLenum pname, GLint param) override;
virtual void gl_pixel_storei(GLenum pname, GLint param) override;
virtual void gl_scissor(GLint x, GLint y, GLsizei width, GLsizei height) override;
virtual void gl_stencil_func_separate(GLenum face, GLenum func, GLint ref, GLuint mask) override;
virtual void gl_stencil_op_separate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass) override;
virtual void present() override;
private:
@ -164,8 +166,25 @@ private:
GLenum m_alpha_test_func = GL_ALWAYS;
GLclampf m_alpha_test_ref_value = 0;
// Stencil configuration
bool m_stencil_test_enabled { false };
struct StencilFunctionOptions {
GLenum func { GL_ALWAYS };
GLint reference_value { 0 };
GLuint mask { NumericLimits<GLuint>::max() };
};
StencilFunctionOptions m_stencil_backfacing_func;
StencilFunctionOptions m_stencil_frontfacing_func;
struct StencilOperationOptions {
GLenum op_fail { GL_KEEP };
GLenum op_depth_fail { GL_KEEP };
GLenum op_pass { GL_KEEP };
};
StencilOperationOptions m_stencil_backfacing_op;
StencilOperationOptions m_stencil_frontfacing_op;
GLenum m_current_read_buffer = GL_BACK;
GLenum m_current_draw_buffer = GL_BACK;
@ -245,7 +264,9 @@ private:
decltype(&SoftwareGLContext::gl_draw_elements),
decltype(&SoftwareGLContext::gl_depth_range),
decltype(&SoftwareGLContext::gl_polygon_offset),
decltype(&SoftwareGLContext::gl_scissor)>;
decltype(&SoftwareGLContext::gl_scissor),
decltype(&SoftwareGLContext::gl_stencil_func_separate),
decltype(&SoftwareGLContext::gl_stencil_op_separate)>;
using ExtraSavedArguments = Variant<
FloatMatrix4x4>;

2
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
View file

@ -204,6 +204,8 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
FloatVector4 pixel_buffer[RASTERIZER_BLOCK_SIZE][RASTERIZER_BLOCK_SIZE];
// FIXME: implement stencil testing
// Iterate over all blocks within the bounds of the triangle
for (int by = by0; by < by1; by++) {
for (int bx = bx0; bx < bx1; bx++) {