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Improved Z precision at 16bpp.

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This commit is contained in:
Steven Fuller 2001-08-09 07:03:00 +00:00 • committed by Patryk Obara
parent ea2f8c4527
commit 9d32d89705
1 changed files with 4 additions and 5 deletions
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9
src/opengl.c
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@ -79,7 +79,6 @@ switch(RenderPolygon.TranslucencyMode)
int x1, y1;
RENDERVERTEX *vertices = &renderVerticesPtr[i];
/* this is just random garbage */
x1 = (vertices->X*(Global_VDB_Ptr->VDB_ProjX+1))/vertices->Z+Global_VDB_Ptr->VDB_CentreX;
y1 = (vertices->Y*(Global_VDB_Ptr->VDB_ProjY+1))/vertices->Z+Global_VDB_Ptr->VDB_CentreY;
x = x1;
@ -88,14 +87,14 @@ switch(RenderPolygon.TranslucencyMode)
x = (x - 320.0)/320.0;
y = -(y - 240.0)/240.0;
zvalue = 65536 - vertices->Z+HeadUpDisplayZOffset;
zvalue = 1.0 - ZNear/zvalue;
z = -zvalue;
zvalue = vertices->Z+HeadUpDisplayZOffset;
zvalue = 1.0 - ZNear/zvalue*2;
z = zvalue;
glColor4ub(vertices->R, vertices->G, vertices->B, vertices->A);
glVertex3f(x, y, z);
// fprintf(stderr, "Vertex %d: (%f, %f, %f)\n\t[%d, %d, %d]->[%d, %d] (%d, %d, %d, %d)\n", i, x, y, z, vertices->X, vertices->Y, vertices->Z, x1, y1, vertices->R, vertices->G, vertices->B, vertices->A);
// fprintf(stderr, "znear = %f, zvalue = %f, z = %f\n", ZNear, zvalue, z);
// fprintf(stderr, "GREP: z = %d, znear = %f, zvalue = %f, z = %f\n", vertices->Z, ZNear, zvalue, z);
}
glEnd();