LibGL+LibSoftGPU: Add GPU side shader infrastructure

This adds a shader class to LibSoftGPU and makes use of it when linking
GLSL program in LibGL. Also adds actual rendering code to the shader
tests.

Userland/Libraries/LibGL/Shader.cpp

@@ -157,7 +157,7 @@ void GLContext::gl_link_program(GLuint program)
     // FIXME: implement check "GL_INVALID_OPERATION is generated if program is the currently active program object and transform feedback mode is active."
 
     // NOTE: We are ignoring the link result since this is tracked inside the program object
-    (void)program_it->value->link();
+    (void)program_it->value->link(*m_rasterizer);
 }
 
 void GLContext::gl_use_program(GLuint program)

Userland/Libraries/LibGL/Shaders/Program.cpp

@@ -48,7 +48,7 @@ ErrorOr<void> Program::attach_shader(Shader& shader)
     return {};
 }
 
-ErrorOr<void> Program::link()
+ErrorOr<void> Program::link(GPU::Device& device)
 {
     m_info_log = TRY(String::from_utf8(""sv));
 
@@ -86,6 +86,9 @@ ErrorOr<void> Program::link()
 
     m_linked_fragment_shader = linked_fragment_shader_or_error.release_value();
 
+    m_gpu_vertex_shader = TRY(device.create_shader({}));
+    m_gpu_fragment_shader = TRY(device.create_shader({}));
+
     m_link_status = true;
     return {};
 }

Userland/Libraries/LibGL/Shaders/Program.h

@@ -15,6 +15,8 @@
 #include <AK/Vector.h>
 #include <LibGL/Shaders/Shader.h>
 #include <LibGLSL/LinkedShader.h>
+#include <LibGPU/Device.h>
+#include <LibGPU/Shader.h>
 
 namespace GL {
 
@@ -24,7 +26,7 @@ public:
 
     bool is_shader_attached(Shader const&) const;
     ErrorOr<void> attach_shader(Shader&);
-    ErrorOr<void> link();
+    ErrorOr<void> link(GPU::Device&);
     bool link_status() const { return m_link_status; }
     size_t info_log_length() const;
 
@@ -35,6 +37,8 @@ private:
     Optional<String> m_info_log;
     OwnPtr<GLSL::LinkedShader> m_linked_vertex_shader;
     OwnPtr<GLSL::LinkedShader> m_linked_fragment_shader;
+    RefPtr<GPU::Shader> m_gpu_vertex_shader;
+    RefPtr<GPU::Shader> m_gpu_fragment_shader;
 };
 
 }