Classic: support for multiple blending tables + Lunatic interfaces.

Currently, sprite[].filler (to be renamed) selects a blending table. If none
is installed with that index, the blending table at index 0 is taken (which is
read from PALETTE.DAT on engine startup). Thus, for now, the non-Lunatic build
will never use a custom blending table because there's no way to register one!
But the functionality is there.

git-svn-id: https://svn.eduke32.com/eduke32@4301 1a8010ca-5511-0410-912e-c29ae57300e0

polymer/eduke32/build/include/build.h

@@ -79,6 +79,7 @@ enum rendmode_t {
 #define MAXPLAYERS 16
 #define MAXBASEPALS 8
 #define MAXPALOOKUPS 256
+#define MAXBLENDTABS 256
 // Maximum number of defined multi-pskies:
 #define MAXPSKYMULTIS 8
 // Maximum number of component tiles in a multi-psky:
@@ -760,6 +761,7 @@ EXTERN int16_t sintable[2048];
 EXTERN uint8_t palette[768];
 EXTERN int16_t numshades;
 EXTERN char *palookup[MAXPALOOKUPS];
+EXTERN char *blendtable[MAXBLENDTABS];
 EXTERN uint8_t **basepaltableptr;
 EXTERN char showinvisibility;
 EXTERN int32_t g_visibility, parallaxvisibility;

polymer/eduke32/build/src/engine.c

@@ -2333,6 +2333,7 @@ static int32_t *horizlookup=0, *horizlookup2=0;
 int32_t globalposx, globalposy, globalposz, globalhoriz;
 int16_t globalang, globalcursectnum;
 int32_t globalpal, cosglobalang, singlobalang;
+static int32_t globalblend;
 int32_t cosviewingrangeglobalang, sinviewingrangeglobalang;
 static char *globalpalwritten;
 static int32_t globaluclip, globaldclip;
@@ -2364,7 +2365,6 @@ int16_t sectorborder[256], sectorbordercnt;
 int32_t ydim16, qsetmode = 0;
 int16_t pointhighlight=-1, linehighlight=-1, highlightcnt=0;
 static int32_t lastx[MAXYDIM];
-static char *transluc;
 
 static char paletteloaded = 0;
 
@@ -2469,7 +2469,8 @@ char palfadedelta = 0;
 //
 // Internal Engine Functions
 //
-//int32_t cacheresets = 0,cacheinvalidates = 0;
+
+#define getblendtab(blend) (blendtable[blend])
 
 static void setpalettefade_calc(uint8_t offset);
 
@@ -2488,7 +2489,7 @@ void fade_screen_black(int32_t moreopaquep)
         begindrawing();
         {
             char *const p = (char *)frameplace;
-            const char *const trans = transluc;
+            const char *const trans = getblendtab(0);
             const int32_t shiftamnt = ((!!moreopaquep)*8);
             const int32_t dimprod = xdim*ydim;
 
@@ -4123,7 +4124,7 @@ static void nonpow2_thline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_
 
     const char *const buf = (char *)bufplc;
     const char *const pal = (char *)asm3;
-    const char *const trans = transluc;
+    const char *const trans = getblendtab(globalblend);
 
     const uint32_t xdiv = globalxspan > 1 ? (uint32_t)ourdivscale32(1, globalxspan) : UINT32_MAX;
     const uint32_t ydiv = globalyspan > 1 ? (uint32_t)ourdivscale32(1, globalyspan) : UINT32_MAX;
@@ -4249,7 +4250,7 @@ static void tslopevlin(uint8_t *p, int32_t i, const intptr_t *slopalptr, int32_t
 {
     const char *const buf = ggbuf;
     const char *const pal = ggpal;
-    const char *const trans = transluc;
+    const char *const trans = getblendtab(0);
     const int32_t bzinc = (asm1>>3), pinc = ggpinc;
 
     const int32_t transmode = (globalorientation&128);
@@ -5589,6 +5590,18 @@ static void drawsprite_opengl(int32_t snum)
     //============================================================================= //POLYMOST ENDS
 }
 
+static void setup_blend(int32_t blend)
+{
+    if (blendtable[blend] == NULL)
+        blend = 0;
+
+    if (globalblend != blend)
+    {
+        globalblend = blend;
+        fixtransluscence(FP_OFF(getblendtab(blend)));
+    }
+}
+
 static void drawsprite_classic(int32_t snum)
 {
     int32_t xoff, yoff, xspan, yspan;
@@ -5668,6 +5681,8 @@ static void drawsprite_classic(int32_t snum)
     if (palookup[globalpal] == NULL) globalpal = 0;    // JBF: fixes null-pointer crash
     globalshade = tspr->shade;
 
+    setup_blend(tspr->filler);
+
     if (cstat&2)
     {
         if (cstat&512) settransreverse(); else settransnormal();
@@ -7981,6 +7996,7 @@ static int32_t loadpalette_err(const char *msg)
 static int32_t loadpalette(void)
 {
     int32_t fil, lamedukep=0;
+    char *transluc;
 
     if (paletteloaded != 0) return 0;
     if ((fil = kopen4load("palette.dat",0)) == -1)
@@ -8001,6 +8017,7 @@ static int32_t loadpalette(void)
     globalpalwritten = palookup[0]; globalpal = 0;
     setpalookupaddress(globalpalwritten);
 
+    blendtable[0] = transluc;
     fixtransluscence(FP_OFF(transluc));
 
     // Auto-detect LameDuke. Its PALETTE.DAT doesn't have a 'numshades' 16-bit
@@ -8719,8 +8736,6 @@ void uninitengine(void)
 {
     int32_t i;
 
-    //OSD_Printf("cacheresets = %d, cacheinvalidates = %d\n", cacheresets, cacheinvalidates);
-
 #ifdef USE_OPENGL
     polymost_glreset();
     hicinit();
@@ -8737,7 +8752,6 @@ void uninitengine(void)
     for (i=0; i<MAXARTFILES_TOTAL; i++)
         DO_FREE_AND_NULL(artptrs[i]);
 
-    DO_FREE_AND_NULL(transluc);
     DO_FREE_AND_NULL(pic);
     DO_FREE_AND_NULL(lookups);
 
@@ -14659,6 +14673,23 @@ static void maybe_alloc_palookup(int32_t palnum)
 }
 
 #ifdef LUNATIC
+const char *(getblendtab)(int32_t blend)
+{
+    return blendtable[blend];
+}
+
+void setblendtab(int32_t blend, const char *tab)
+{
+    if (blendtable[blend] == NULL)
+    {
+        blendtable[blend] = Bmalloc(256*256);
+        if (blendtable[blend] == NULL)
+            exit(1);
+    }
+
+    Bmemcpy(blendtable[blend], tab, 256*256);
+}
+
 int32_t setpalookup(int32_t palnum, const uint8_t *shtab)
 {
     if (numshades != 32)

polymer/eduke32/source/lunatic/engine.lua

@@ -18,6 +18,9 @@ int32_t getclosestcol(int32_t r, int32_t g, int32_t b);
 char *palookup[256];  // MAXPALOOKUPS
 uint8_t palette[768];
 
+const char *getblendtab(int32_t blend);
+void setblendtab(int32_t blend, const char *tab);
+
 int32_t setpalookup(int32_t palnum, const uint8_t *shtab);
 ]]
 
@@ -30,8 +33,8 @@ local engine = {}
 
 local shtab_t  -- forward-decl
 
-local function cast_u8ptr(pal256)
-    return ffi.cast("uint8_t *", pal256)
+local function cast_u8ptr(sth)
+    return ffi.cast("uint8_t *", sth)
 end
 
 local shtab_methods = {
@@ -73,20 +76,31 @@ local function shtab_mt__index(sht, idx)
     end
 end
 
-local pal256_t = bcarray.new("uint8_t", 256, "shade table 256-tuple")
+local pal256_t = bcarray.new("uint8_t", 256, "color index 256-tuple")
 -- The shade table type, effectively a bound-checked uint8_t [32][256]:
 shtab_t = bcarray.new(pal256_t, 32, "shade table", nil, nil, { __index = shtab_mt__index })
 local SIZEOF_SHTAB = ffi.sizeof(shtab_t)
 
+local blendtab_t = bcarray.new(pal256_t, 256, "blending table")
+local SIZEOF_BLENDTAB = ffi.sizeof(blendtab_t)
+
 local RESERVEDPALS = 8  -- KEEPINSYNC build.h: assure that ours is >= theirs
 engine.RESERVEDPALS = RESERVEDPALS
 
+local MAXBLENDTABS = 256  -- KEEPINSYNC build.h
+
 local function check_palidx(i)
     if (type(i) ~= "number" or not (i >= 0 and i <= 255-RESERVEDPALS)) then
         error("invalid argument #1: palette swap index must be in the range [0 .. "..255-RESERVEDPALS.."]", 3)
     end
 end
 
+local function check_blendidx(i)
+    if (type(i) ~= "number" or not (i >= 0 and i <= MAXBLENDTABS-1)) then
+        error("invalid argument #1: blending table index must be in the range [0 .. ".. MAXBLENDTABS-1 .."]", 3)
+    end
+end
+
 local function err_uncommon_shade_table(ret)
     if (ret == -1) then
         error("loaded engine shade tables don't have 32 gradients of shade", 3)
@@ -101,6 +115,10 @@ function engine.shadetab()
     return shtab_t()
 end
 
+function engine.blendtab()
+    return blendtab_t()
+end
+
 function engine.getshadetab(palidx)
     check_palidx(palidx)
     if (palookup_isdefault(palidx)) then
@@ -115,13 +133,31 @@ function engine.getshadetab(palidx)
     return sht
 end
 
-function engine.setshadetab(palidx, shtab)
-    if (not ismapster32 and C.g_elFirstTime == 0) then
-        error("setshadetab() may be run only while LUNATIC_FIRST_TIME is true", 2)
+function engine.getblendtab(blendidx)
+    check_blendidx(blendidx)
+
+    local ptr = C.getblendtab(blendidx)
+    if (ptr == nil) then
+        return nil
     end
 
+    local tab = blendtab_t()
+    ffi.copy(tab, ptr, SIZEOF_BLENDTAB)
+    return tab
+end
+
+
+local function check_first_time()
+    if (not ismapster32 and C.g_elFirstTime == 0) then
+        error("may be called only while LUNATIC_FIRST_TIME is true", 3)
+    end
+end
+
+function engine.setshadetab(palidx, shtab)
+    check_first_time()
     check_palidx(palidx)
-    if (not ffi.istype(shtab_t, shtab_t)) then
+
+    if (not ffi.istype(shtab_t, shtab)) then
         error("invalid argument #2: must be a shade table obtained by shadetab()", 2)
     end
 
@@ -129,10 +165,25 @@ function engine.setshadetab(palidx, shtab)
         error("attempt to override already defined shade table", 2)
     end
 
-    local ret = C.setpalookup(palidx, ffi.cast("uint8_t *", shtab))
+    local ret = C.setpalookup(palidx, cast_u8ptr(shtab))
     err_uncommon_shade_table(ret)
 end
 
+function engine.setblendtab(blendidx, tab)
+    check_first_time()
+    check_blendidx(blendidx)
+
+    if (not ffi.istype(blendtab_t, tab)) then
+        error("invalid argument #2: must be a blending table obtained by blendtab()", 2)
+    end
+
+    if (not ismapster32 and C.getblendtab(blendidx) ~= nil) then
+        error("attempt to override already defined blending table", 2)
+    end
+
+    C.setblendtab(blendidx, cast_u8ptr(tab))
+end
+
 
 local function check_colcomp(a)
     if (type(a) ~= "number" or not (a >= 0 and a <= 63)) then
@@ -147,6 +198,15 @@ function engine.getrgb(colidx)
         error("color index must be in the range [0 .. 255]", 2)
     end
 
+    -- NOTE: In the game, palette[255*{0..2}] is set to 0 in
+    -- G_LoadExtraPalettes() via G_Startup(). However, that's after Lua state
+    -- initialization (i.e. when LUNATIC_FIRST_TIME would be true), and in the
+    -- editor, it's never changed from the purple color. Therefore, I think
+    -- it's more useful to always return the fully black color here.
+    if (colidx == 255) then
+        return 0, 0, 0
+    end
+
     local rgbptr = C.palette + 3*colidx
     return rgbptr[0], rgbptr[1], rgbptr[2]
 end

polymer/eduke32/source/lunatic/test/shadexfog.lua

@@ -273,6 +273,44 @@ function shadexfog.test_create0()
     end
 end
 
+---------- Blending table tests ----------
+
+function shadexfog.create_128_trans(startblendidx)
+    for alpha=1,128 do
+        local f = alpha/256
+        local F = 1-f
+
+        local tab = engine.blendtab()
+
+        for i=0,255 do
+            for j=0,255 do
+                local r,g,b = engine.getrgb(i)
+                local R,G,B = engine.getrgb(j)
+
+                tab[i][j] = engine.nearcolor(f*r+F*R, f*g+F*G, f*b+F*B)
+            end
+        end
+
+        engine.setblendtab(startblendidx + alpha-1, tab)
+    end
+end
+
+function shadexfog.create_additive_trans(blendidx)
+    local tab = engine.blendtab()
+
+    for i=0,255 do
+        for j=0,255 do
+            local r,g,b = engine.getrgb(i)
+            local R,G,B = engine.getrgb(j)
+
+            tab[i][j] = engine.nearcolor(min(r+R, 63), min(g+G, 63), min(b+B, 63))
+        end
+    end
+
+    engine.setblendtab(blendidx, tab)
+end
+
+
 do
     return shadexfog
 end