5 files changed, 21 insertions, 1 deletions
diff --git a/Userland/Libraries/LibGL/GL/gl.h b/Userland/Libraries/LibGL/GL/gl.h
index 8c5674bd96..64b037a471 100644
--- a/Userland/Libraries/LibGL/GL/gl.h
+++ b/Userland/Libraries/LibGL/GL/gl.h
@@ -467,6 +467,7 @@ GLAPI void glNormal3fv(GLfloat const* v);
 GLAPI void glRasterPos2i(GLint x, GLint y);
 GLAPI void glMaterialf(GLenum face, GLenum pname, GLfloat param);
 GLAPI void glMaterialfv(GLenum face, GLenum pname, GLfloat const* params);
+GLAPI void glLineWidth(GLfloat width);
 
 #ifdef __cplusplus
 }
diff --git a/Userland/Libraries/LibGL/GLContext.h b/Userland/Libraries/LibGL/GLContext.h
index 42f392908d..58b7281cd7 100644
--- a/Userland/Libraries/LibGL/GLContext.h
+++ b/Userland/Libraries/LibGL/GLContext.h
@@ -98,6 +98,7 @@ public:
     virtual void gl_normal(GLfloat nx, GLfloat ny, GLfloat nz) = 0;
     virtual void gl_raster_pos(GLfloat x, GLfloat y, GLfloat z, GLfloat w) = 0;
     virtual void gl_materialv(GLenum face, GLenum pname, GLfloat const* params) = 0;
+    virtual void gl_line_width(GLfloat width) = 0;
 
     virtual void present() = 0;
 };
diff --git a/Userland/Libraries/LibGL/GLDraw.cpp b/Userland/Libraries/LibGL/GLDraw.cpp
index 102013867b..5be277a741 100644
--- a/Userland/Libraries/LibGL/GLDraw.cpp
+++ b/Userland/Libraries/LibGL/GLDraw.cpp
@@ -9,6 +9,11 @@
 
 extern GL::GLContext* g_gl_context;
 
+void glLineWidth(GLfloat width)
+{
+    g_gl_context->gl_line_width(width);
+}
+
 void glRasterPos2i(GLint x, GLint y)
 {
     g_gl_context->gl_raster_pos(static_cast<float>(x), static_cast<float>(y), 0.0f, 1.0f);
diff --git a/Userland/Libraries/LibGL/SoftwareGLContext.cpp b/Userland/Libraries/LibGL/SoftwareGLContext.cpp
index 48a3faadc4..675751cb5c 100644
--- a/Userland/Libraries/LibGL/SoftwareGLContext.cpp
+++ b/Userland/Libraries/LibGL/SoftwareGLContext.cpp
@@ -2318,6 +2318,15 @@ void SoftwareGLContext::gl_materialv(GLenum face, GLenum pname, GLfloat const* p
     dbgln_if(GL_DEBUG, "SoftwareGLContext FIXME: gl_materialv({}, {}, {}, {}, {}, {})", face, pname, x, y, z, w);
 }
 
+void SoftwareGLContext::gl_line_width(GLfloat width)
+{
+    APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_line_width, width);
+
+    RETURN_WITH_ERROR_IF(width <= 0, GL_INVALID_VALUE);
+
+    m_line_width = width;
+}
+
 void SoftwareGLContext::present()
 {
     m_rasterizer.blit_to(*m_frontbuffer);
diff --git a/Userland/Libraries/LibGL/SoftwareGLContext.h b/Userland/Libraries/LibGL/SoftwareGLContext.h
index 19342056de..8474cb425d 100644
--- a/Userland/Libraries/LibGL/SoftwareGLContext.h
+++ b/Userland/Libraries/LibGL/SoftwareGLContext.h
@@ -109,6 +109,7 @@ public:
     virtual void gl_normal(GLfloat nx, GLfloat ny, GLfloat nz) override;
     virtual void gl_raster_pos(GLfloat x, GLfloat y, GLfloat z, GLfloat w) override;
     virtual void gl_materialv(GLenum face, GLenum pname, GLfloat const* params) override;
+    virtual void gl_line_width(GLfloat width) override;
     virtual void present() override;
 
 private:
@@ -278,7 +279,8 @@ private:
             decltype(&SoftwareGLContext::gl_stencil_op_separate),
             decltype(&SoftwareGLContext::gl_normal),
             decltype(&SoftwareGLContext::gl_raster_pos),
-            decltype(&SoftwareGLContext::gl_materialv)>;
+            decltype(&SoftwareGLContext::gl_materialv),
+            decltype(&SoftwareGLContext::gl_line_width)>;
 
         using ExtraSavedArguments = Variant<
             FloatMatrix4x4>;
@@ -325,6 +327,8 @@ private:
         FloatVector4 texture_coordinates { 0.0f, 0.0f, 0.0f, 1.0f };
     };
     RasterPosition m_current_raster_position;
+
+    float m_line_width { 1.0f };
 };
 
 }