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https://git.coom.tech/drummyfish/small3dlib.git
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Stash drawing modes
This commit is contained in:
Miloslav Číž
parent
f446b046e4
commit
d18807b077
2 changed files with 25 additions and 109 deletions
132
small3dlib.h
132
small3dlib.h
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@ -430,7 +430,6 @@ static inline void S3L_initCamera(S3L_Camera *c);
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typedef struct
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{
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uint8_t backfaceCulling;
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uint8_t mode;
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} S3L_DrawConfig;
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void S3L_initDrawConfig(S3L_DrawConfig *config);
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@ -477,10 +476,6 @@ static inline void S3L_initPixelInfo(S3L_PixelInfo *p);
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#define S3L_BACKFACE_CULLING_CW 1
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#define S3L_BACKFACE_CULLING_CCW 2
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#define S3L_MODE_TRIANGLES 0
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#define S3L_MODE_LINES 1
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#define S3L_MODE_POINTS 2
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// general helper functions
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static inline S3L_Unit S3L_abs(S3L_Unit value);
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static inline S3L_Unit S3L_min(S3L_Unit v1, S3L_Unit v2);
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@ -1045,11 +1040,10 @@ void S3L_initPixelInfo(S3L_PixelInfo *p) // TODO: maybe non-pointer for p
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void S3L_initDrawConfig(S3L_DrawConfig *config)
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{
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config->backfaceCulling = 1;
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config->mode = S3L_MODE_TRIANGLES;
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}
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void S3L_PIXEL_FUNCTION(S3L_PixelInfo *pixel); // forward decl
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// TODO: ^ should be inline?
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static inline void S3L_PIXEL_FUNCTION(S3L_PixelInfo *pixel); // forward decl
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typedef struct
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{
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int16_t steps;
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@ -1288,13 +1282,20 @@ void S3L_newFrame()
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S3L_stencilBufferClear();
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}
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void _S3L_drawFilledTriangle(
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void S3L_drawTriangle(
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S3L_Vec4 point0,
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S3L_Vec4 point1,
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S3L_Vec4 point2,
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const S3L_DrawConfig *config,
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const S3L_Camera *camera,
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S3L_PixelInfo *p)
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S3L_Index modelID,
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S3L_Index triangleID)
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{
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S3L_PixelInfo p;
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S3L_initPixelInfo(&p);
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p.modelID = modelID;
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p.triangleID = triangleID;
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S3L_Vec4 *tPointPP, *lPointPP, *rPointPP; /* points in projction plane space
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(in Units, normalized by
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S3L_FRACTIONS_PER_UNIT) */
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@ -1321,7 +1322,7 @@ void _S3L_drawFilledTriangle(
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tPointSx = x##t;\
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tPointSy = y##t;\
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tPointPP = &point##t;\
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barycentric2 = &(p->barycentric##t);\
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barycentric2 = &(p.barycentric##t);\
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int16_t aDx = x##a - x##t;\
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int16_t bDx = x##b - x##t;\
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int16_t aDy = S3L_nonZero(y##a - y##t);\
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@ -1331,16 +1332,16 @@ void _S3L_drawFilledTriangle(
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lPointSx = x##a; lPointSy = y##a;\
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rPointSx = x##b; rPointSy = y##b;\
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lPointPP = &point##a; rPointPP = &point##b;\
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barycentric0 = &(p->barycentric##b);\
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barycentric1 = &(p->barycentric##a);\
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barycentric0 = &(p.barycentric##b);\
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barycentric1 = &(p.barycentric##a);\
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}\
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else\
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{\
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lPointSx = x##b; lPointSy = y##b;\
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rPointSx = x##a; rPointSy = y##a;\
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lPointPP = &point##b; rPointPP = &point##a;\
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barycentric0 = &(p->barycentric##a);\
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barycentric1 = &(p->barycentric##b);\
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barycentric0 = &(p.barycentric##a);\
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barycentric1 = &(p.barycentric##b);\
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}\
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}
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@ -1535,7 +1536,7 @@ void _S3L_drawFilledTriangle(
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{ /* TODO: ^ This is bad though, a single large
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triangle outside he top of the screen will trigger
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a long loop. Try to FIX THIS! */
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p->y = currentY;
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p.y = currentY;
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// draw the horizontal line
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@ -1604,10 +1605,10 @@ void _S3L_drawFilledTriangle(
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for (S3L_ScreenCoord x = lXClipped; x < rXClipped; ++x)
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{
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#if S3L_STENCIL_BUFFER
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if (!S3L_stencilTest(x,p->y))
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if (!S3L_stencilTest(x,p.y))
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continue;
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#endif
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p->x = x;
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p.x = x;
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#if S3L_PERSPECTIVE_CORRECTION == 1
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S3L_Unit rowT =
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@ -1617,20 +1618,20 @@ void _S3L_drawFilledTriangle(
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#if S3L_COMPUTE_DEPTH
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#if S3L_PERSPECTIVE_CORRECTION == 1
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p->depth = S3L_interpolateByUnit(lDepth,rDepth,rowT);
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p.depth = S3L_interpolateByUnit(lDepth,rDepth,rowT);
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#else
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p->depth = S3L_getFastLerpValue(depthFLS);
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p.depth = S3L_getFastLerpValue(depthFLS);
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S3L_stepFastLerp(depthFLS);
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#endif
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#if S3L_NEAR_CLAMPING
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if (p->depth < S3L_NEAR)
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if (p.depth < S3L_NEAR)
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continue;
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#endif
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#endif
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#if S3L_Z_BUFFER
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if (!S3L_zTest(p->x,p->y,p->depth))
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if (!S3L_zTest(p.x,p.y,p.depth))
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continue;
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#endif
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@ -1650,7 +1651,7 @@ void _S3L_drawFilledTriangle(
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*barycentric2 = S3L_FRACTIONS_PER_UNIT - *barycentric0 - *barycentric1;
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S3L_PIXEL_FUNCTION(p);
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S3L_PIXEL_FUNCTION(&p);
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}
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} // y clipping
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@ -1671,91 +1672,6 @@ void _S3L_drawFilledTriangle(
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#undef stepSide
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}
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void S3L_drawTriangle(
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S3L_Vec4 point0,
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S3L_Vec4 point1,
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S3L_Vec4 point2,
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const S3L_DrawConfig *config,
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const S3L_Camera *camera,
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S3L_Index modelID,
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S3L_Index triangleID)
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{
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S3L_PixelInfo p;
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S3L_initPixelInfo(&p);
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p.modelID = modelID;
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p.triangleID = triangleID;
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if (config->mode == S3L_MODE_TRIANGLES) // triangle mode
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{
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/* This function will perform the mapping to screen space itself, it needs
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the original values, hence no conversion here. */
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_S3L_drawFilledTriangle(point0,point1,point2,camera,&p);
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return;
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}
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// map to screen space
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S3L_ScreenCoord x0, y0, x1, y1, x2, y2;
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S3L_mapProjectionPlaneToScreen(point0,&x0,&y0);
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S3L_mapProjectionPlaneToScreen(point1,&x1,&y1);
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S3L_mapProjectionPlaneToScreen(point2,&x2,&y2);
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if (config->mode == S3L_MODE_LINES) // line mode
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{
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S3L_BresenhamState line;
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S3L_Unit lineLen;
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#define drawLine(p1,p2)\
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S3L_bresenhamInit(&line,x##p1,y##p1,x##p2,y##p2);\
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p.barycentric0 = 0;\
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p.barycentric1 = 0;\
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p.barycentric2 = 0;\
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lineLen = S3L_nonZero(line.steps);\
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do\
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{\
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if (line.x >= 0 && line.x < S3L_RESOLUTION_X &&\
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line.y >= 0 && line.y < S3L_RESOLUTION_Y)\
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{\
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p.x = line.x; p.y = line.y;\
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p.barycentric##p1 = S3L_interpolateFrom0(\
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S3L_FRACTIONS_PER_UNIT,line.steps,lineLen); \
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p.barycentric##p2 = S3L_FRACTIONS_PER_UNIT - p.barycentric##p1;\
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S3L_PIXEL_FUNCTION(&p);\
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}\
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} while (S3L_bresenhamStep(&line));
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drawLine(0,1)
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drawLine(2,0)
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drawLine(1,2)
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#undef drawLine
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}
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else // point mode
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{
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if (x0 >= 0 && x0 < S3L_RESOLUTION_X && y0 >= 0 && y0 < S3L_RESOLUTION_Y)
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{
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p.x = x0; p.y = y0; p.barycentric0 = S3L_FRACTIONS_PER_UNIT;
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p.barycentric1 = 0; p.barycentric2 = 0;
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S3L_PIXEL_FUNCTION(&p);
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}
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if (x1 >= 0 && x1 < S3L_RESOLUTION_X && y1 >= 0 && y1 < S3L_RESOLUTION_Y)
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{
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p.x = x1; p.y = y1; p.barycentric0 = 0;
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p.barycentric1 = S3L_FRACTIONS_PER_UNIT; p.barycentric2 = 0;
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S3L_PIXEL_FUNCTION(&p);
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}
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if (x2 >= 0 && x2 < S3L_RESOLUTION_X && y2 >= 0 && y2 < S3L_RESOLUTION_Y)
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{
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p.x = x2; p.y = y2; p.barycentric0 = 0;
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p.barycentric1 = 0; p.barycentric2 = S3L_FRACTIONS_PER_UNIT;
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S3L_PIXEL_FUNCTION(&p);
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}
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}
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}
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void S3L_rotate2DPoint(S3L_Unit *x, S3L_Unit *y, S3L_Unit angle)
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{
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if (angle < S3L_SIN_TABLE_UNIT_STEP)
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@ -7,7 +7,7 @@
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#include <stdio.h>
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#include <math.h>
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#define S3L_PRESET_EMBEDDED
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#define S3L_PRESET_HIGHEST_QUALITY
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#define S3L_PIXEL_FUNCTION drawPixel
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