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Added an updated description of the polygon header to the top of Legacy3D/Models.cpp

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This commit is contained in:
Bart Trzynadlowski 2016-04-26 23:04:11 +00:00
parent 3e8439c09c
commit 85a77bb016
1 changed files with 49 additions and 4 deletions
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53
Src/Graphics/Legacy3D/Models.cpp
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@ -24,10 +24,56 @@
*
* Model parsing, caching, and drawing.
*
* Polygon header bits:
*
* 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* 0 | S | S | S | S | S | S |ID?|ID?|ID?|ID?| ID| ID| ID| ID| ID| ID| ID| ID| ID| ID| ID| ID| | | SC|TYP| | |LNK|LNK|LNK|LNK|
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* 1 | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | |TCF| | | |END|COL| |
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* 2 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | | | | | | |RPX|RPY|
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* 3 | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | Z | | |TXW|TXW|TXW|TXH|TXH|TXH|
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* 4 |?/R|P/R|P/R|P/R|P/R|P/R|P/R|P/R|P/G|P/G|P/G|P/G|?/G|Q/G|Q/G|Q/G|Q/B|Q/B|Q/B|Q/B|Q/B|Q/B|Q/B|Q/B| | TP| | TX| TX| TX| TX| TX|
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* 5 | | | | | | | | | | | | | | | | | | | | | | | | | TX| | | TY| TY| TY| TY| TY|
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* 6 |TRN| | | | | | | |OPQ| TL| TL| TL| TL| TL| |LUM|FOG|FOG|FOG|FOG|FOG|TEN|TFM|TFM|TFM| | | | | | | |
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
*
* S 6-bit Field Unknown purpose
* ID Identification A numerical identifier of unknown purpose that increments for each polygon in the model
* SC 6-bit Field Control Related to the 6-bit field
* TYP Polygon Type 0 = Triangle, 1 = Quad
* LNK Link Strip link information
* X Normal X Lighting normal X component (2.22 fixed-point)
* Y Normal Y
* Z Normal Z
* TCF Tex. Coord. Format 0 = 13.3 unsigned fixed-point, 1 = unsigned 16 bits
* END Model End 1 = Last polygon in model
* COL Polygon Color Format 0 = Palette-based (P, Q), 1 = RGB
* RPX Texture X Repeat 0 = Wrap, 1 = Mirror
* RPY Texture Y Repeat
* TXW Texture Width 000 = 32, 001 = 64, 010 = 128, 011 = 256, 100 = 512
* TXH Texture Height
* R Red Red component of untextured polygon color
* G Green
* B Blue
* TP Texture Page 0 = First 2048x1024 page, 1 = Second page
* TX Texture X Texture X position within page in units of 32 pixels
* TY Texture Y Texture Y position within page in units of 32 pixels
* TRN Transparency 0 = No transparency, 1 = Process A1RGB5 pixels with A set as transparent (does it affect RGBA4 textures?)
* TEN Texture Enable 0 = Do not texture, 1 = Texture
* OPQ Opaque 0 = Polygon is translucent (32 levels of transparency), 1 = Polygon is opaque
* TL Transparency Level 32 levels of transparency
* LUM Luminous 0 = Lighting enabled, 1 = Lighting disabled (luminous)
* FOG Fog Attenuation Effect of fog on luminous polygons (0 = full fog effect, 31 = no fog). "SetLightModifier()" in API docs.
* TFM Texture Format
*
* TO-DO List:
* -----------
* - If vertex normals aren't offset from polygon normals, would that improve
* specular lighting?
* - More should be predecoded into the polygon structures, so that things like
* texture base coordinates are not re-decoded in two different places!
*/
@ -361,8 +407,7 @@ void CLegacy3D::ClearDisplayList(ModelCache *Cache)
void CLegacy3D::InsertVertex(ModelCache *Cache, const Vertex *V, const Poly *P, float normFlip)
{
// Texture selection
unsigned texEnable = P->header[6]&0x400;
// unsigned texEnable = P->header[6]&0x04000000;
unsigned texEnable = P->header[6]&0x400;
unsigned texFormat = (P->header[6]>>7)&7;
GLfloat texWidth = (GLfloat) (32<<((P->header[3]>>3)&7));
GLfloat texHeight = (GLfloat) (32<<((P->header[3]>>0)&7));