[PICA] Start working on textures

include/renderer_gl/textures.hpp

@@ -0,0 +1,60 @@
+#pragma once
+#include <array>
+#include "boost/icl/interval.hpp"
+#include "helpers.hpp"
+#include "opengl.hpp"
+
+template <typename T>
+using Interval = boost::icl::right_open_interval<T>;
+
+struct Texture {
+    enum class Formats : u32 {
+        RGBA8 = 0,
+        RGB8 = 1,
+        RGBA5551 = 2,
+        RGB565 = 3,
+        RGBA4 = 4,
+        IA8 = 5,
+        RG8 = 6,
+        I8 = 7,
+        A8 = 8,
+        IA4 = 9,
+        I4 = 10,
+        A4 = 11,
+        ETC1 = 12,
+        ETC1A4 = 13,
+
+        Trash1 = 14, Trash2 = 15 // TODO: What are these?
+    };
+
+    u32 location;
+    Formats format;
+    OpenGL::uvec2 size;
+    bool valid;
+
+    // Range of VRAM taken up by buffer
+    Interval<u32> range;
+    // OpenGL resources allocated to buffer
+    OpenGL::Texture texture;
+
+    Texture() : valid(false) {}
+
+    Texture(u32 loc, Formats format, u32 x, u32 y, bool valid = true)
+        : location(loc), format(format), size({x, y}), valid(valid) {
+
+        u64 endLoc = (u64)loc + sizeInBytes();
+        // Check if start and end are valid here
+        range = Interval<u32>(loc, (u32)endLoc);
+    }
+
+    // For 2 textures to "match" we only care about their locations, formats, and dimensions to match
+    // For other things, such as filtering mode, etc, we can just switch the attributes of the cached texture
+    bool matches(Texture& other) {
+        return location == other.location && format == other.format &&
+            size.x() == other.size.x() && size.y() == other.size.y();
+    }
+
+    void allocate();
+    void free();
+    u64 sizeInBytes();
+};