1 files changed, 104 insertions, 0 deletions
diff --git a/src/video_core/regs_shader.h b/src/video_core/regs_shader.h
new file mode 100644
index 000000000..ddb1ee451
--- /dev/null
+++ b/src/video_core/regs_shader.h
@@ -0,0 +1,104 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+
+#include "common/bit_field.h"
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+
+namespace Pica {
+
+struct ShaderRegs {
+    BitField<0, 16, u32> bool_uniforms;
+
+    union {
+        BitField<0, 8, u32> x;
+        BitField<8, 8, u32> y;
+        BitField<16, 8, u32> z;
+        BitField<24, 8, u32> w;
+    } int_uniforms[4];
+
+    INSERT_PADDING_WORDS(0x4);
+
+    union {
+        // Number of input attributes to shader unit - 1
+        BitField<0, 4, u32> max_input_attribute_index;
+    };
+
+    // Offset to shader program entry point (in words)
+    BitField<0, 16, u32> main_offset;
+
+    /// Maps input attributes to registers. 4-bits per attribute, specifying a register index
+    u32 input_attribute_to_register_map_low;
+    u32 input_attribute_to_register_map_high;
+
+    unsigned int GetRegisterForAttribute(unsigned int attribute_index) const {
+        u64 map = ((u64)input_attribute_to_register_map_high << 32) |
+                  (u64)input_attribute_to_register_map_low;
+        return (map >> (attribute_index * 4)) & 0b1111;
+    }
+
+    BitField<0, 16, u32> output_mask;
+
+    // 0x28E, CODETRANSFER_END
+    INSERT_PADDING_WORDS(0x2);
+
+    struct {
+        enum Format : u32 {
+            FLOAT24 = 0,
+            FLOAT32 = 1,
+        };
+
+        bool IsFloat32() const {
+            return format == FLOAT32;
+        }
+
+        union {
+            // Index of the next uniform to write to
+            // TODO: ctrulib uses 8 bits for this, however that seems to yield lots of invalid
+            // indices
+            // TODO: Maybe the uppermost index is for the geometry shader? Investigate!
+            BitField<0, 7, u32> index;
+
+            BitField<31, 1, Format> format;
+        };
+
+        // Writing to these registers sets the current uniform.
+        u32 set_value[8];
+
+    } uniform_setup;
+
+    INSERT_PADDING_WORDS(0x2);
+
+    struct {
+        // Offset of the next instruction to write code to.
+        // Incremented with each instruction write.
+        u32 offset;
+
+        // Writing to these registers sets the "current" word in the shader program.
+        u32 set_word[8];
+    } program;
+
+    INSERT_PADDING_WORDS(0x1);
+
+    // This register group is used to load an internal table of swizzling patterns,
+    // which are indexed by each shader instruction to specify vector component swizzling.
+    struct {
+        // Offset of the next swizzle pattern to write code to.
+        // Incremented with each instruction write.
+        u32 offset;
+
+        // Writing to these registers sets the current swizzle pattern in the table.
+        u32 set_word[8];
+    } swizzle_patterns;
+
+    INSERT_PADDING_WORDS(0x2);
+};
+
+static_assert(sizeof(ShaderRegs) == 0x30 * sizeof(u32), "ShaderRegs struct has incorrect size");
+
+} // namespace Pica