LibGL: Implement `glFogf`

6 files changed, 27 insertions, 0 deletions

diff --git a/Userland/Libraries/LibGL/GL/gl.h b/Userland/Libraries/LibGL/GL/gl.h
index d165f8124a..4dd39ff8ac 100644
--- a/Userland/Libraries/LibGL/GL/gl.h
+++ b/Userland/Libraries/LibGL/GL/gl.h
@@ -375,6 +375,7 @@ GLAPI void glDepthRange(GLdouble nearVal, GLdouble farVal);
 GLAPI void glDepthFunc(GLenum func);
 GLAPI void glPolygonMode(GLenum face, GLenum mode);
 GLAPI void glFogfv(GLenum mode, GLfloat* params);
+GLAPI void glFogf(GLenum pname, GLfloat param);
 
 #ifdef __cplusplus
 }
diff --git a/Userland/Libraries/LibGL/GLContext.h b/Userland/Libraries/LibGL/GLContext.h
index 30bb6342d1..131d4568f5 100644
--- a/Userland/Libraries/LibGL/GLContext.h
+++ b/Userland/Libraries/LibGL/GLContext.h
@@ -78,6 +78,7 @@ public:
     virtual void gl_depth_func(GLenum func) = 0;
     virtual void gl_polygon_mode(GLenum face, GLenum mode) = 0;
     virtual void gl_fogfv(GLenum pname, GLfloat* params) = 0;
+    virtual void gl_fogf(GLenum pname, GLfloat params) = 0;
 
     virtual void present() = 0;
 };
diff --git a/Userland/Libraries/LibGL/GLFog.cpp b/Userland/Libraries/LibGL/GLFog.cpp
index 381119c3de..37fc2253e5 100644
--- a/Userland/Libraries/LibGL/GLFog.cpp
+++ b/Userland/Libraries/LibGL/GLFog.cpp
@@ -13,3 +13,8 @@ void glFogfv(GLenum pname, GLfloat* params)
 {
     g_gl_context->gl_fogfv(pname, params);
 }
+
+void glFogf(GLenum pname, GLfloat param)
+{
+    g_gl_context->gl_fogf(pname, param);
+}
diff --git a/Userland/Libraries/LibGL/SoftwareGLContext.cpp b/Userland/Libraries/LibGL/SoftwareGLContext.cpp
index ca73b70c20..9ffc09de24 100644
--- a/Userland/Libraries/LibGL/SoftwareGLContext.cpp
+++ b/Userland/Libraries/LibGL/SoftwareGLContext.cpp
@@ -1765,6 +1765,24 @@ void SoftwareGLContext::gl_fogfv(GLenum pname, GLfloat* params)
     m_rasterizer.set_options(options);
 }
 
+void SoftwareGLContext::gl_fogf(GLenum pname, GLfloat param)
+{
+    RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
+    RETURN_WITH_ERROR_IF(param < 0.0f, GL_INVALID_VALUE);
+
+    auto options = m_rasterizer.options();
+
+    switch (pname) {
+    case GL_FOG_DENSITY:
+        options.fog_density = param;
+        break;
+    default:
+        RETURN_WITH_ERROR_IF(true, GL_INVALID_ENUM);
+    }
+
+    m_rasterizer.set_options(options);
+}
+
 void SoftwareGLContext::present()
 {
     m_rasterizer.blit_to(*m_frontbuffer);
diff --git a/Userland/Libraries/LibGL/SoftwareGLContext.h b/Userland/Libraries/LibGL/SoftwareGLContext.h
index 5b84ceafd0..48875f0eab 100644
--- a/Userland/Libraries/LibGL/SoftwareGLContext.h
+++ b/Userland/Libraries/LibGL/SoftwareGLContext.h
@@ -88,6 +88,7 @@ public:
     virtual void gl_depth_func(GLenum func) override;
     virtual void gl_polygon_mode(GLenum face, GLenum mode) override;
     virtual void gl_fogfv(GLenum pname, GLfloat* params) override;
+    virtual void gl_fogf(GLenum pname, GLfloat param) override;
     virtual void present() override;
 
 private:
diff --git a/Userland/Libraries/LibGL/SoftwareRasterizer.h b/Userland/Libraries/LibGL/SoftwareRasterizer.h
index c110f794e9..27c421032a 100644
--- a/Userland/Libraries/LibGL/SoftwareRasterizer.h
+++ b/Userland/Libraries/LibGL/SoftwareRasterizer.h
@@ -39,6 +39,7 @@ struct RasterizerOptions {
         0.0f,
         0.0f,
     };
+    GLfloat fog_density { 1.0f };
 };
 
 class SoftwareRasterizer final {