List of not implemented features for nv0x
Primitives
1. Lines, points, AA lines, AA points [ugly code exist]
2. TRI_FAN and others.
Fragment processing:
1. OpenGL LogicOp
Vertex processing:
1. Polygon offset
Generic
1. Fast glReadPixels [blob can do 25MPix/s on AGP hardware with TNT2]
2. faster primitive submission code (VBO interface to Mesa?)
Interesting regs
1. <reg32 offset="0x0310" name="BLEND"> - bits 0-4 control texture blending.
Guess blend reg control full blending, according to DirectFB driver source? For example, full BLEND reg defined there as
1514 #define TXTRI_BLEND 0x00000310 1515 #define TXTRI_BLEND_TEXTUREMAPBLEND_DECAL 0x00000001 1516 #define TXTRI_BLEND_TEXTUREMAPBLEND_MODULATE 0x00000002 1517 #define TXTRI_BLEND_TEXTUREMAPBLEND_DECALALPHA 0x00000003 1518 #define TXTRI_BLEND_TEXTUREMAPBLEND_MODULATEALPHA 0x00000004 1519 #define TXTRI_BLEND_TEXTUREMAPBLEND_DECALMASK 0x00000005 1520 #define TXTRI_BLEND_TEXTUREMAPBLEND_MODULATEMASK 0x00000006 1521 #define TXTRI_BLEND_TEXTUREMAPBLEND_COPY 0x00000007 1522 #define TXTRI_BLEND_TEXTUREMAPBLEND_ADD 0x00000008 1523 #define TXTRI_BLEND_OPERATION_MUX_TALPHALSB 0x00000010 1524 #define TXTRI_BLEND_OPERATION_MUX_TALPHAMSB 0x00000020 1525 #define TXTRI_BLEND_SHADEMODE_FLAT 0x00000040 1526 #define TXTRI_BLEND_SHADEMODE_GOURAUD 0x00000080 1527 #define TXTRI_BLEND_SHADEMODE_PHONG 0x000000C0 1528 #define TXTRI_BLEND_TEXTUREPERSPECTIVE_ENABLE 0x00000100 1529 #define TXTRI_BLEND_SPECULAR_ENABLE 0x00001000 1530 #define TXTRI_BLEND_FOG_ENABLE 0x00010000 1531 #define TXTRI_BLEND_ALPHABLEND_ENABLE 0x00100000 1532 #define TXTRI_BLEND_SRCBLEND_ZERO 0x01000000 1533 #define TXTRI_BLEND_SRCBLEND_ONE 0x02000000 1534 #define TXTRI_BLEND_SRCBLEND_SRCCOLOR 0x03000000 1535 #define TXTRI_BLEND_SRCBLEND_INVSRCCOLOR 0x04000000 1536 #define TXTRI_BLEND_SRCBLEND_SRCALPHA 0x05000000 1537 #define TXTRI_BLEND_SRCBLEND_INVSRCALPHA 0x06000000 1538 #define TXTRI_BLEND_SRCBLEND_DESTALPHA 0x07000000 1539 #define TXTRI_BLEND_SRCBLEND_INVDESTALPHA 0x08000000 1540 #define TXTRI_BLEND_SRCBLEND_DESTCOLOR 0x09000000 1541 #define TXTRI_BLEND_SRCBLEND_INVDESTCOLOR 0x0A000000 1542 #define TXTRI_BLEND_SRCBLEND_SRCALPHASAT 0x0B000000 1543 #define TXTRI_BLEND_DESTBLEND_ZERO 0x10000000 1544 #define TXTRI_BLEND_DESTBLEND_ONE 0x20000000 1545 #define TXTRI_BLEND_DESTBLEND_SRCCOLOR 0x30000000 1546 #define TXTRI_BLEND_DESTBLEND_INVSRCCOLOR 0x40000000 1547 #define TXTRI_BLEND_DESTBLEND_SRCALPHA 0x50000000 1548 #define TXTRI_BLEND_DESTBLEND_INVSRCALPHA 0x60000000 1549 #define TXTRI_BLEND_DESTBLEND_DESTALPHA 0x70000000 1550 #define TXTRI_BLEND_DESTBLEND_INVDESTALPHA 0x80000000 1551 #define TXTRI_BLEND_DESTBLEND_DESTCOLOR 0x90000000 1552 #define TXTRI_BLEND_DESTBLEND_INVDESTCOLOR 0xA0000000 1553 #define TXTRI_BLEND_DESTBLEND_SRCALPHASAT 0xB0000000
2. <reg32 offset="0x0314" name="CONTROL"> - <bitfield name="Z_FORMAT" high="31" low="30" type="int"/> - strange, some sources talks about 24/16 bit floating/integer Z buffer on tnt2 hw. Currently bit 30 set to "1", and it works in 32 bpp color mode, but 16-bit X mode makes DRI painfully slow.