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- /*
- * $Id: $
- */
-
- /*
- * Mesa 3-D graphics library
- * Version: 3.1
- * Copyright (C) 1995 Brian Paul (brianp@ssec.wisc.edu)
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- /**********************************************************************/
- /***** Optimized line rendering *****/
- /**********************************************************************/
-
- /* Draw a flat-shaded, RGB line into an osmesa buffer. */
- void cybFlatRGBALine(GLcontext * ctx, GLuint vert0, GLuint vert1, GLuint pvert)
- {
- struct RastPort *rp;
- GLuint pixel;
-
- rp = ((amigaMesaContext) ctx->DriverCtx)->rp
- pixel = TC_RGBA(ctx->VB->ColorPtr->data[pvert][0], ctx->VB->ColorPtr->data[pvert][1], ctx->VB->ColorPtr->data[pvert][2]) >> 8;
-
- #define INTERP_XY 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) WriteRGBPixel(rp, X, Y, pixel)
-
- #include "../../linetemp.h"
- }
-
- /* Draw a flat-shaded, RGB line into an osmesa buffer. */
- void cybFlatCI32Line(GLcontext * ctx, GLuint vert0, GLuint vert1, GLuint pvert)
- {
- struct RastPort *rp;
- GLuint pixel;
-
- rp = ((amigaMesaContext) ctx->DriverCtx)->rp
- pixel = GetRGBP(((amigaMesaContext) ctx->DriverCtx), ctx->VB->IndexPtr->data[pvert])
-
- #define INTERP_XY 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) WriteRGBPixel(rp, X, Y, pixel)
-
- #include "../../linetemp.h"
- }
-
- /* Draw a flat-shaded, Z-less, RGB line into an osmesa buffer. */
- void cybFlatRGBAZLine(GLcontext * ctx, GLuint vert0, GLuint vert1, GLuint pvert)
- {
- struct RastPort *rp;
- GLuint pixel;
-
- rp = ((amigaMesaContext) ctx->DriverCtx)->rp
- pixel = TC_RGBA(ctx->VB->ColorPtr->data[pvert][0], ctx->VB->ColorPtr->data[pvert][1], ctx->VB->ColorPtr->data[pvert][2]) >> 8;
-
- #define INTERP_XY 1
- #define INTERP_Z 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) \
- if (Z < *zPtr) { \
- WriteRGBPixel(rp, X, Y, pixel); \
- *zPtr = Z; \
- }
-
- #include "../../linetemp.h"
- }
-
- /* Draw a flat-shaded, Z-less, RGB line into an osmesa buffer. */
- void cybFlatCI32ZLine(GLcontext * ctx, GLuint vert0, GLuint vert1, GLuint pvert)
- {
- struct RastPort *rp;
- GLuint pixel;
-
- rp = ((amigaMesaContext) ctx->DriverCtx)->rp
- pixel = GetRGBP(((amigaMesaContext) ctx->DriverCtx), ctx->VB->IndexPtr->data[pvert])
-
- #define INTERP_XY 1
- #define INTERP_Z 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) \
- if (Z < *zPtr) { \
- WriteRGBPixel(rp, X, Y, pixel); \
- *zPtr = Z; \
- }
-
- #include "../../linetemp.h"
- }
-
- /* Draw a flat-shaded, alpha-blended, RGB line into an osmesa buffer. */
- void cybFlatBlendRGBALine(GLcontext * ctx, GLuint vert0, GLuint vert1, GLuint pvert)
- {
- struct RastPort *rp;
- GLuint *db;
- struct vertex_buffer *VB;
- GLint avalue, msavalue, rvalue, gvalue, bvalue;
-
- db = dbRGBAGet(((amigaMesaContext) ctx->DriverCtx));
- rp = ((amigaMesaContext) ctx->DriverCtx)->rp
- VB = ctx->VB;
- avalue = VB->ColorPtr->data[pvert][3];
- msavalue = 255 - avalue;
- rvalue = VB->ColorPtr->data[pvert][0] * avalue;
- gvalue = VB->ColorPtr->data[pvert][1] * avalue;
- bvalue = VB->ColorPtr->data[pvert][2] * avalue;
-
- #define INTERP_XY 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) { \
- GLubyte *ptr4 = (GLubyte *)dbRGBA(db, X, Y); \
- WriteRGBPixel(rp, X, Y, TC_RGBA(((*ptr4++ * msavalue + rvalue) >> 8), \
- ((*ptr4++ * msavalue + gvalue) >> 8), \
- ((*ptr4 * msavalue + bvalue) >> 8)) >> 8); \
- }
-
- #include "../../linetemp.h"
- }
-
- /* Draw a flat-shaded, Z-less, alpha-blended, RGB line into an osmesa buffer. */
- void cybFlatBlendRGBAZLine(GLcontext * ctx, GLuint vert0, GLuint vert1, GLuint pvert)
- {
- struct RastPort *rp;
- GLuint *db;
- struct vertex_buffer *VB;
- GLint avalue, msavalue, rvalue, gvalue, bvalue;
-
- db = dbRGBAGet(((amigaMesaContext) ctx->DriverCtx));
- rp = ((amigaMesaContext) ctx->DriverCtx)->rp
- VB = ctx->VB;
- avalue = VB->ColorPtr->data[pvert][3];
- msavalue = 255 - avalue;
- rvalue = VB->ColorPtr->data[pvert][0] * avalue;
- gvalue = VB->ColorPtr->data[pvert][1] * avalue;
- bvalue = VB->ColorPtr->data[pvert][2] * avalue;
-
- #define INTERP_XY 1
- #define INTERP_Z 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) \
- if (Z < *zPtr) { \
- GLubyte *ptr4 = (GLubyte *)dbRGBA(db, X, Y); \
- WriteRGBPixel(rp, X, Y, TC_RGBA(((*ptr4++ * msavalue + rvalue) >> 8), \
- ((*ptr4++ * msavalue + gvalue) >> 8), \
- ((*ptr4 * msavalue + bvalue) >> 8)) >> 8); \
- }
-
- #include "../../linetemp.h"
- }
-
- /* Draw a flat-shaded, Z-less, alpha-blended, RGB line into an osmesa buffer. */
- void cybFlatBlendRGBAZLineWrite(GLcontext * ctx, GLuint vert0, GLuint vert1, GLuint pvert)
- {
- struct RastPort *rp;
- GLuint *db;
- struct vertex_buffer *VB;
- GLint avalue, msavalue, rvalue, gvalue, bvalue;
-
- db = dbRGBAGet(((amigaMesaContext) ctx->DriverCtx));
- rp = ((amigaMesaContext) ctx->DriverCtx)->rp
- VB = ctx->VB;
- avalue = VB->ColorPtr->data[pvert][3];
- msavalue = 255 - avalue;
- rvalue = VB->ColorPtr->data[pvert][0] * avalue;
- gvalue = VB->ColorPtr->data[pvert][1] * avalue;
- bvalue = VB->ColorPtr->data[pvert][2] * avalue;
-
- #define INTERP_XY 1
- #define INTERP_Z 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) \
- if (Z < *zPtr) { \
- GLubyte *ptr4 = (GLubyte *)dbRGBA(db, X, Y); \
- WriteRGBPixel(rp, X, Y, TC_RGBA(((*ptr4++ * msavalue + rvalue) >> 8), \
- ((*ptr4++ * msavalue + gvalue) >> 8), \
- ((*ptr4 * msavalue + bvalue) >> 8)) >> 8); \
- *zPtr = Z; \
- }
-
- #include "../../linetemp.h"
- }
-
- /*
- * Analyze context state to see if we can provide a fast line drawing
- * function, like those in lines.c. Otherwise, return NULL.
- */
- line_func test_cybChooseLineFunction(GLcontext * ctx)
- {
- GLboolean rgbmode = ctx->Visual->RGBAflag;
-
- if (ctx->Line.SmoothFlag)
- return NULL;
- if (ctx->Texture.Enabled)
- return NULL;
- if (ctx->Light.ShadeModel != GL_FLAT)
- return NULL;
- if (ctx->Line.Width != 1.0F)
- return NULL;
- if (ctx->Line.StippleFlag)
- return NULL;
-
- switch (ctx->RasterMask) {
- case 0:
- if (rgbmode)
- return cybFlatRGBALine;
- else
- return cybFlatCI32Line;
- break;
- case DEPTH_BIT:
- if ((ctx->Depth.Func == GL_LESS) &&
- (ctx->Depth.Mask))
- if (rgbmode)
- return cybFlatRGBAZLine;
- else
- return cybFlatCI32ZLine;
- break;
- case BLEND_BIT:
- if ((ctx->Color.BlendSrc == GL_SRC_ALPHA) &&
- (ctx->Color.BlendDst == GL_ONE_MINUS_SRC_ALPHA) &&
- (ctx->Color.BlendEquation == GL_FUNC_ADD_EXT))
- return cybFlatBlendRGBALine;
- break;
- case DEPTH_BIT | BLEND_BIT:
- if ((ctx->Depth.Func == GL_LESS) &&
- (ctx->Color.BlendSrc == GL_SRC_ALPHA) &&
- (ctx->Color.BlendDst == GL_ONE_MINUS_SRC_ALPHA) &&
- (ctx->Color.BlendEquation == GL_FUNC_ADD_EXT)) {
- if (ctx->Depth.Mask)
- return cybFlatBlendRGBAZLineWrite;
- else
- return cybFlatBlendRGBAZLine;
- }
- break;
- default:
- break;
- }
-
- return NULL;
- }
-