From d182fd7f46e7569067b952752dd7efa2fef6582f Mon Sep 17 00:00:00 2001
From: Kieron Morris <kjm@kieronmorris.me>
Date: Sun, 6 Feb 2022 13:25:04 +0000
Subject: [PATCH] TARGA & Texture Units

Added TARGA and Texture units to represent & parse TARGA into and provide a standard texture format for use when drawing.
---
 src/include/color.pas   |  4 +++
 src/include/targa.pas   | 67 +++++++++++++++++++++++++++++++++++++++++
 src/include/texture.pas | 34 +++++++++++++++++++++
 3 files changed, 105 insertions(+)
 create mode 100644 src/include/targa.pas
 create mode 100644 src/include/texture.pas

diff --git a/src/include/color.pas b/src/include/color.pas
index cd22dd05..42039b2a 100644
--- a/src/include/color.pas
+++ b/src/include/color.pas
@@ -28,24 +28,28 @@ type
         R : uint8;
         A : uint8;
     end;
+    PRGB32 = ^TRGB32;
 
     TRGB24 = bitpacked record
         B : uint8;
         G : uint8;
         R : uint8;
     end;
+    PRGB23 = ^TRGB24;
 
     TRGB16 = bitpacked record
         B : UBit5;
         G : UBit6;
         R : UBit5;
     end;
+    PRGB16 = ^TRGB16;
 
     TRGB8 = bitpacked record
         B : UBit2;
         G : UBit4;
         R : UBit2;
     end;
+    PRGB8 = ^TRGB8;
 
 const
     black : TRGB32 = (B: 000; G: 000; R: 000; A: 000);
diff --git a/src/include/targa.pas b/src/include/targa.pas
new file mode 100644
index 00000000..6a2804aa
--- /dev/null
+++ b/src/include/targa.pas
@@ -0,0 +1,67 @@
+unit targa;
+
+interface
+
+uses
+    lmemorymanager, texture;
+
+type
+    TTARGAColor = packed record
+      b, g, r, a: uint8;
+    end;
+    PTARGAColor = ^TTARGAColor;
+
+    TTARGAHeader = packed record
+        Magic: uint8;
+        ColorMapType: uint8;
+        ImageType: uint8;
+        ColorMapOrigin: uint16;
+        ColorMapLength: uint16;
+        ColorMapDepth: uint8;
+        XOrigin: uint16;
+        YOrigin: uint16;
+        Width: uint16;
+        Height: uint16;
+        PixelDepth: uint8;
+        ImageDescriptor: uint8;
+        Data : PTARGAColor;
+    end;
+    PTARGAHeader = ^TTARGAHeader;
+
+Function Parse(buffer : puint8; len : uint32) : PTexture;
+
+implementation
+
+Function Parse(buffer : puint8; len : uint32) : PTexture;
+var
+    header : PTARGAHeader;
+    i, j : uint32;
+    data : PTARGAColor;
+    tex : PTexture;
+
+begin
+    if (len < sizeof(TTARGAHeader)) then exit;
+
+    header := PTARGAHeader(buffer);
+    if (header^.Magic <> $0) or (header^.ImageType <> 2) or (header^.PixelDepth <> 32) then exit;
+    
+    //Create a new texture
+    tex:= texture.newTexture(header^.Width, header^.Height);
+    tex^.Width:= header^.Width;
+    tex^.Height:= header^.Height;
+    
+    //Copy the data
+    data := PTARGAColor(header^.Data);
+    for i := 0 to header^.Height - 1 do begin
+        for j := 0 to header^.Width - 1 do begin
+            tex^.Pixels[i * header^.Width + j].r := data^.r;
+            tex^.Pixels[i * header^.Width + j].g := data^.g;
+            tex^.Pixels[i * header^.Width + j].b := data^.b;
+            tex^.Pixels[i * header^.Width + j].a := data^.a;
+        end;
+    end;
+
+    Parse := tex;
+end;
+
+end.
\ No newline at end of file
diff --git a/src/include/texture.pas b/src/include/texture.pas
new file mode 100644
index 00000000..7c3957f2
--- /dev/null
+++ b/src/include/texture.pas
@@ -0,0 +1,34 @@
+unit texture;
+
+interface
+
+uses
+    lmemorymanager, color;
+
+type
+    TTexture = packed record
+        Width  : uint32; 
+        Height : uint32; 
+        Size   : uint32;
+        Pixels : PRGB32;
+    end;
+    PTexture = ^TTexture;
+
+Function newTexture(width, height: uint32): PTexture;
+
+implementation
+
+Function newTexture(width, height: uint32): PTexture;
+var
+    texture: PTexture;
+
+begin
+    texture:= PTexture(kalloc(sizeof(TTexture)));
+    texture^.Pixels:= PRGB32(kalloc(width * height * sizeof(TRGB32)));
+    texture^.Width:= width;
+    texture^.Height:= height;
+    texture^.Size:= width * height;
+    newTexture:= texture;
+end;
+
+end.
\ No newline at end of file