fixed 16bpp offsets in csprite generator (hardcoded for now)

[dosdemo] / tools / csprite / src / main.c

diff --git a/tools/csprite/src/main.c b/tools/csprite/src/main.c
index 5bece2d..d1f024b 100644 (file)
--- a/tools/csprite/src/main.c
+++ b/tools/csprite/src/main.c
@@ -126,11 +126,19 @@ const char *prefixfmt[] = {
        "tiletab:\n",
 
        /* NASM template */
+       /* TODO hardcoding the 16bpp changes for now, generalize later
+        *      and while we're at it, let's get rid of the mul too ...
+        */
        "\tglobal %s\n"
        "%s:\n"
        "\tmov eax, [esp + 12]\n"
-       "\tmov ecx, %d\n"
-       "\tmul ecx\n"
+       ";\tmov ecx, %d\n"
+       ";\tmul ecx\n"
+       "\tmov ecx, eax\n"
+       "\tshl eax, 9\n"
+       "\tshl ecx, 7\n"
+       "\tadd eax, ecx\n"
+       "\tadd eax, [esp + 8]\n"
        "\tadd eax, [esp + 8]\n"
        "\tadd eax, [esp + 4]\n"
        "\tmov edx, eax\n"