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[ICEs.git] / 394889 / s_triangle.i.15

diff --git a/394889/s_triangle.i.15 b/394889/s_triangle.i.15
new file mode 100644 (file)
index 0000000..d71357b
--- /dev/null
+++ b/394889/s_triangle.i.15
@@ -0,0 +1,122 @@
+static __inline__ int IS_INF_OR_NAN(float x)
+{
+       union {
+               float f;
+               int i;
+       } tmp;
+       tmp.f = x;
+       return tmp.i;
+}
+
+typedef struct {
+       float **attrib;
+} SWvertex;
+typedef struct sw_span {
+       int x;
+       int y;
+       int end;
+       float attrStepX[30][4];
+       int intTex[2];
+       int intTexStep[2];
+} SWspan;
+static void simple_textured_triangle( SWvertex * v1)
+{
+       SWvertex *v0;
+       SWvertex *v2;
+       typedef struct {
+               float dx;
+               float dy;
+               int fsx;
+               int fx0;
+               int lines;
+       } EdgeT;
+       EdgeT eMaj;
+       EdgeT eTop;
+       EdgeT eBot;
+       float oneOverArea;
+       SWvertex *vMin;
+       SWvertex *vMid;
+       SWvertex *vMax;
+       int vMin_fx;
+       int vMin_fy;
+       int vMid_fx;
+       int vMid_fy;
+       int vMax_fx;
+       int vMax_fy;
+       SWspan span;
+        int fy0 = v0->attrib[0][1];
+        int fy1 = v1->attrib[0][1];
+        int fy2 = v2->attrib[0][1];
+       if (fy1 <= fy2) {
+               vMin = v0;
+               vMax = v1;
+               vMin_fy = fy0;
+       }
+       vMin_fx = vMin->attrib[0][0];
+       vMid_fx = (int)
+             (vMid->attrib[4][0] ? 
+((vMid->attrib[4][0] * (float)2048) + 0.5F) : 
+((vMid->attrib[4][0] * (float)2048) - 0.5F));
+       eMaj.dx = (vMax_fx - vMin_fx) * (1.0F / (float)2048);
+       eMaj.dy = (vMax_fy - vMin_fy) * (1.0F / (float)2048);
+       eTop.dx = (vMax_fx - vMid_fx) * (1.0F / (float)2048);
+       eBot.dy = (vMid_fy - vMin_fy) * (1.0F / (float)2048);
+       float area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy;
+       if (IS_INF_OR_NAN(area))
+               return;
+       oneOverArea = 1.0F / area;
+       eBot.fx0 = vMin_fx;
+       int scan_from_left_to_right;
+       void (*PutRowRGB)();
+       char *texture;
+       float eMaj_ds = (vMax->attrib[4][0] - vMin->attrib[4][0]);
+       float eBot_ds;
+       span.attrStepX[4][0] =
+           oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds);
+       span.intTexStep[0] =
+           (int)
+             ((span.attrStepX[4][0] >=
+               0.0F) ? span.attrStepX[4][0] :
+(span.attrStepX[4][0] * (float)2048) - 0.5F);
+       int subTriangle;
+       int fxRightEdge = 0;
+       for (subTriangle = 0; subTriangle <= 1; subTriangle++) {
+               EdgeT *eRight;
+               int lines;
+               if (subTriangle == 0) {
+                       if (scan_from_left_to_right) {
+                               eRight = &eBot;
+                               lines = eRight->lines;
+                       } else {
+                               eRight = &eMaj;
+                       }
+               } else {
+                       if (scan_from_left_to_right) {
+                               eRight = &eTop;
+                       }
+                       fxRightEdge = eRight->fsx;
+               }
+               while (lines > 0) {
+                       span.x = 0;
+                       if (fxRightEdge <= span.x)
+                               span.end = 0;
+                       else
+                               span.end = fxRightEdge - span.x;
+                       span.intTex[0] = 0;
+                       if (span.end > 0 && span.y >= 0) {
+                               int i;
+                               char *rgb;
+                               for (i = 0; i < span.end; i++) {
+                                       rgb[i] = texture[span.intTex[0]];
+                                       span.intTex[0] += span.intTexStep[0];
+                               }
+                               PutRowRGB(rgb);
+                       }
+               }
+       }
+}
+
+void *foo()
+{
+       return simple_textured_triangle;
+}