G3dRenderWithPixels.mesa
Copyright © 1984 by Xerox Corporation. All rights reserved.
Last Edited by: Crow, August 9, 1989 3:04:40 pm PDT
Glassner, March 14, 1989 2:18:44 pm PST
DIRECTORY G3dRender, ImagerSample, Rope;
G3dRenderWithPixels: CEDAR DEFINITIONS
~ BEGIN
Types
Context:    TYPE ~ G3dRender.Context;
ContextProc:   TYPE ~ G3dRender.ContextProc;
ImagerProc:   TYPE ~ G3dRender.ImagerProc;
Pair:     TYPE ~ G3dRender.Pair;
PairSequence:  TYPE ~ G3dRender.PairSequence;
Patch:     TYPE ~ G3dRender.Patch;
PatchProc:   TYPE ~ G3dRender.PatchProc;
Pixel:     TYPE ~ G3dRender.Pixel;
Quad:     TYPE ~ G3dRender.Quad;
RealSequence:  TYPE ~ G3dRender.RealSequence;
RGB:     TYPE ~ G3dRender.RGB;
RopeProc:    TYPE ~ G3dRender.RopeProc;
RenderData:   TYPE ~ G3dRender.RenderData;
ShadingClass:  TYPE ~ G3dRender.ShadingClass;
SpotProc:    TYPE ~ G3dRender.SpotProc;
Triple:    TYPE ~ G3dRender.Triple;
ROPE:     TYPE ~ Rope.ROPE;
RasterSampleMaps: TYPE ~ ARRAY [0..5) OF ImagerSample.RasterSampleMap;
RopeDesc:    TYPE ~ RECORD [rope: ROPE, pos: Pair, color: Pixel, size: REAL, font: ROPE];
LerpVtx:    TYPE ~ RECORD [
x, y:       REAL,
val:       RealSequence
];
LerpVtxSequence: TYPE ~ RECORD [
length:      CARDINAL,
element:      SEQUENCE maxLength: CARDINAL OF REF LerpVtx
];
FancyPatch:   TYPE ~ RECORD [
recurseLevel:     NAT ← 0,
renderData:     REF RenderData,    -- procs for texturing, etc.
ctlPt:       SEQUENCE length: CARDINAL OF LerpVtx
];
Initializing and Updating Pixel Maps
AllocatePixelMemory: ContextProc;
Get pixel memory for things like rgb, alpha, depth, normal coding.
Get a bare context for making images independent of color display.
DepthBuffering: PROC [context: Context, on: BOOL ← TRUE ];
Sets up or destroys depth buffer in VM for context.pixels.
AntiAliasing: PROC [context: Context, on: BOOL ← TRUE ];
Sets up or destroys alpha buffer in VM for context.pixels (used for antialiasing).
NormalBuffering: PROC [context: Context, on: BOOL ← TRUE ];
Sets up or destroys normal vector buffer in VM for context.pixels (used for LightingTool)
.
FillInBackGround: ContextProc;
Loads background behind current image.
FillInConstantBackGround: PROC [context: Context, bkgrdClr: RGB, cvrge: BYTE ← 255];
Clears frame, use with alpha buffer to load background color behind shapes.
Frame Generation
BufferRendering: PROC [context: Context, on: BOOL ← TRUE ];
Renders through buffer and blits to screen when on, directly to screen (slowly) when off
MakeFrame: ContextProc;
Makes image, clears frame, adds background, etc.
Low-level drawing
ShadeSpot: SpotProc;
Send spot values through the vertex shading procedure.
Draw2DLine: PROC [context: Context, p1, p2: Pair, color: Pixel];
Draw a line with integer endpoints.
Draw2DPoly: PROC [context: Context, poly: PairSequence, color: Pixel];
Draw polygon avoiding floating point.
DrawRope: RopeProc;
Put a rope in the pixels, somehow.
DoRope: ImagerProc;
Put a rope in the pixels, using calls on the imager, rope is passed as RopeDesc in data.
Simple Polygon Tilers
PolygonTiler: PatchProc;
Call point for discriminating among tilers.
Fancy Polygon Tilers
FancyTiler: PROC [context: Context, poly: REF Patch];
Recursive implementor of tiler. For Anti-aliasing, texture, etc.
RealFancyTiler: PROC [context: Context, poly: REF FancyPatch];
We're goin' blow the socks off this baby!
END.