[MetaHook] Load large texture from model

We need hook "GL_LoadTexture" engine function.

GL_LOADTEXTURE_SIG from hw.dll(3266) engine, can not use for other engine version.

 1 #include <metahook.h>
 2 #include "qgl.h"
 3 #include "surface.h"
 4
 5 extern DWORD g_dwEngineBase, g_dwEngineSize;
 6
 7 #define GL_LOADTEXTURE_SIG "\xA1\xC8\x20\xEC\x01\x8B\x4C\x24\x20\x8B\x54\x24\x1C\x50\x8B\x44"
 8
 9 int (*g_pfnGL_LoadTexture)(char *identifier, int textureType, int width, int height, BYTE *data, int mipmap, int iType, BYTE *pPal) = 0;
10
11 int GL_LoadTexture(char *identifier, int textureType, int width, int height, BYTE *data, int mipmap, int iType, BYTE *pPal)
12 {
13     if (width > 512 || height > 512)
14     {
15         static BYTE buffer[2048 * 2048 * 3];
16
17         for (DWORD i = 0; i < width * height; ++i)
18         {
19             buffer[(i * 3) + 0] = pPal[(data[i] * 3) + 0];
20             buffer[(i * 3) + 1] = pPal[(data[i] * 3) + 1];
21             buffer[(i * 3) + 2] = pPal[(data[i] * 3) + 2];
22         }
23
24         int id = g_pSurface->CreateNewTextureID();
25
26         qglBindTexture(GL_TEXTURE_2D, id);
27         qglTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, buffer);
28         qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
29         qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
30
31         return id;
32     }
33
34     return g_pfnGL_LoadTexture(identifier, textureType, width, height, data, mipmap, iType, pPal);
35 }
36
37 void Hook_InstallHook(void)
38 {
39     g_pfnGL_LoadTexture = (int (*)(char *, int, int, int, BYTE *, int, int, BYTE *))g_pMetaHookAPI->SearchPattern((void *)g_dwEngineBase, g_dwEngineSize, GL_LOADTEXTURE_SIG, sizeof(GL_LOADTEXTURE_SIG) - 1);
40
41     if (g_pfnGL_LoadTexture)
42     {
43         g_pMetaHookAPI->InlineHook(g_pfnGL_LoadTexture, GL_LoadTexture, (void *&)g_pfnGL_LoadTexture);
44     }
45 }