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/LibSoftGPU/CMakeLists.txt

@@ -4,6 +4,7 @@ set(SOURCES
     Image.cpp
     PixelConverter.cpp
     Sampler.cpp
+    Shader.cpp
 )
 
 add_compile_options(-Wno-psabi)

Userland/Libraries/LibSoftGPU/Device.cpp

@@ -22,6 +22,7 @@
 #include <LibSoftGPU/PixelConverter.h>
 #include <LibSoftGPU/PixelQuad.h>
 #include <LibSoftGPU/SIMD.h>
+#include <LibSoftGPU/Shader.h>
 #include <math.h>
 
 namespace SoftGPU {
@@ -1626,6 +1627,11 @@ NonnullRefPtr<GPU::Image> Device::create_image(GPU::PixelFormat const& pixel_for
     return adopt_ref(*new Image(this, pixel_format, width, height, depth, max_levels));
 }
 
+ErrorOr<NonnullRefPtr<GPU::Shader>> Device::create_shader(GPU::IR::Shader const&)
+{
+    return adopt_ref(*new Shader(this));
+}
+
 void Device::set_sampler_config(unsigned sampler, GPU::SamplerConfig const& config)
 {
     VERIFY(config.bound_image.is_null() || config.bound_image->ownership_token() == this);

Userland/Libraries/LibSoftGPU/Device.h

@@ -65,6 +65,7 @@ public:
     virtual GPU::LightModelParameters light_model() const override { return m_lighting_model; }
 
     virtual NonnullRefPtr<GPU::Image> create_image(GPU::PixelFormat const&, u32 width, u32 height, u32 depth, u32 max_levels) override;
+    virtual ErrorOr<NonnullRefPtr<GPU::Shader>> create_shader(GPU::IR::Shader const&) override;
 
     virtual void set_sampler_config(unsigned, GPU::SamplerConfig const&) override;
     virtual void set_light_state(unsigned, GPU::Light const&) override;

Userland/Libraries/LibSoftGPU/Shader.cpp

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibSoftGPU/Shader.h>
+
+namespace SoftGPU {
+
+Shader::Shader(void const* ownership_token)
+    : GPU::Shader(ownership_token)
+{
+}
+
+}

Userland/Libraries/LibSoftGPU/Shader.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGPU/Shader.h>
+
+namespace SoftGPU {
+
+class Shader final : public GPU::Shader {
+public:
+    Shader(void const* ownership_token);
+};
+
+}