LibSoftGPU: Implement shader processor for SoftGPU ISA

This adds a shader processor that executes our ISA when a fragment
shader is currently bound to the device.

1 files changed, 46 insertions, 0 deletions

diff --git a/Userland/Libraries/LibSoftGPU/ShaderProcessor.h b/Userland/Libraries/LibSoftGPU/ShaderProcessor.h
new file mode 100644
index 0000000000..33bcc29f04
--- /dev/null
+++ b/Userland/Libraries/LibSoftGPU/ShaderProcessor.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Array.h>
+#include <AK/SIMD.h>
+#include <AK/Vector.h>
+#include <LibGPU/Config.h>
+#include <LibSoftGPU/PixelQuad.h>
+#include <LibSoftGPU/Sampler.h>
+
+namespace SoftGPU {
+
+class Shader;
+
+class ShaderProcessor final {
+public:
+    ShaderProcessor(Array<Sampler, GPU::NUM_TEXTURE_UNITS>& samplers)
+        : m_samplers { samplers }
+    {
+    }
+
+    void execute(PixelQuad&, Shader const&);
+
+    ALWAYS_INLINE AK::SIMD::f32x4 get_register(u16 index) const { return m_registers[index]; }
+    ALWAYS_INLINE void set_register(u16 index, AK::SIMD::f32x4 value) { m_registers[index] = value; }
+
+private:
+    void op_input(PixelQuad const&, Instruction::Arguments);
+    void op_output(PixelQuad&, Instruction::Arguments);
+    void op_sample2d(Instruction::Arguments);
+    void op_swizzle(Instruction::Arguments);
+    void op_add(Instruction::Arguments);
+    void op_sub(Instruction::Arguments);
+    void op_mul(Instruction::Arguments);
+    void op_div(Instruction::Arguments);
+
+    Array<Sampler, GPU::NUM_TEXTURE_UNITS>& m_samplers;
+    AK::SIMD::f32x4 m_registers[1024];
+};
+
+}