LibGL: Implement `glClearDepthf` and store as float

Our API still specifies it as a double, but internally we communicate a
float to the rasterizer. Additionally, clamp the value to 0..1 as
described in the spec.

4 files changed, 9 insertions, 3 deletions

diff --git a/Userland/Libraries/LibGL/GL/gl.h b/Userland/Libraries/LibGL/GL/gl.h
index ec4b83b0f7..6aba866260 100644
--- a/Userland/Libraries/LibGL/GL/gl.h
+++ b/Userland/Libraries/LibGL/GL/gl.h
@@ -474,6 +474,7 @@ GLAPI void glBegin(GLenum mode);
 GLAPI void glClear(GLbitfield mask);
 GLAPI void glClearColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
 GLAPI void glClearDepth(GLdouble depth);
+GLAPI void glClearDepthf(GLfloat depth);
 GLAPI void glClearStencil(GLint s);
 GLAPI void glColor3d(GLdouble r, GLdouble g, GLdouble b);
 GLAPI void glColor3dv(GLdouble const* v);
diff --git a/Userland/Libraries/LibGL/GLUtils.cpp b/Userland/Libraries/LibGL/GLUtils.cpp
index 1ba627d5bc..c5cf954be1 100644
--- a/Userland/Libraries/LibGL/GLUtils.cpp
+++ b/Userland/Libraries/LibGL/GLUtils.cpp
@@ -50,6 +50,11 @@ void glClearDepth(GLdouble depth)
     g_gl_context->gl_clear_depth(depth);
 }
 
+void glClearDepthf(GLfloat depth)
+{
+    g_gl_context->gl_clear_depth(static_cast<double>(depth));
+}
+
 void glColorMask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha)
 {
     g_gl_context->gl_color_mask(red, green, blue, alpha);
diff --git a/Userland/Libraries/LibGL/SoftwareGLContext.cpp b/Userland/Libraries/LibGL/SoftwareGLContext.cpp
index 608963d07e..eb751807a7 100644
--- a/Userland/Libraries/LibGL/SoftwareGLContext.cpp
+++ b/Userland/Libraries/LibGL/SoftwareGLContext.cpp
@@ -267,7 +267,7 @@ void SoftwareGLContext::gl_clear(GLbitfield mask)
         m_rasterizer.clear_color(m_clear_color);
 
     if (mask & GL_DEPTH_BUFFER_BIT)
-        m_rasterizer.clear_depth(static_cast<float>(m_clear_depth));
+        m_rasterizer.clear_depth(m_clear_depth);
 
     if (mask & GL_STENCIL_BUFFER_BIT)
         m_rasterizer.clear_stencil(m_clear_stencil);
@@ -288,7 +288,7 @@ void SoftwareGLContext::gl_clear_depth(GLdouble depth)
 
     RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
 
-    m_clear_depth = depth;
+    m_clear_depth = clamp(static_cast<float>(depth), 0.f, 1.f);
 }
 
 void SoftwareGLContext::gl_clear_stencil(GLint s)
diff --git a/Userland/Libraries/LibGL/SoftwareGLContext.h b/Userland/Libraries/LibGL/SoftwareGLContext.h
index ae7bc6981e..02395e54c9 100644
--- a/Userland/Libraries/LibGL/SoftwareGLContext.h
+++ b/Userland/Libraries/LibGL/SoftwareGLContext.h
@@ -208,7 +208,7 @@ private:
     Gfx::IntRect m_viewport;
 
     FloatVector4 m_clear_color { 0.0f, 0.0f, 0.0f, 0.0f };
-    double m_clear_depth { 1.0 };
+    float m_clear_depth { 1.f };
     u8 m_clear_stencil { 0 };
 
     FloatVector4 m_current_vertex_color = { 1.0f, 1.0f, 1.0f, 1.0f };