56 lines
1.5 KiB
Text
56 lines
1.5 KiB
Text
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Steps to producing a picture on the screen from all the values in soft3d
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FRACUNIT => a constant that is 1.0 in fixed point
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Player starts out at:
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playerx = (3 * 64 + 32) * FRACUNIT;
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playery = (3 * 64 + 32) * FRACUNIT;
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playerz = 32 * FRACUNIT;
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playerangle = 0;
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The interrupt does the reading of controls and controlling movement.
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The play loop itself does nothing but Render the view and shoot the rendered
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drawing to the screen.
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Movement:
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Pg/Up & Dn change playerz by FRACUNIT
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Home sets playerz to 32.0
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For translation movement:
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Up and Down -
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Checks to see if the move can be made then increments the players position
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by a set amount.
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playerx and playery are updated depending upon angle of movement and
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if the operation succeeds. In this case if you did not run into a wall.
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Left and Right -
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Changes the playerangle by PLAYERTURNSPEED; in this case 1 degree(?)
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View Rendering :
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This is done with a call to RF_RenderView int R_PUBLIC.C sending player
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position and angle.
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This sets the global varibles viewx, viewy, viewz by stripping off most
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of the lowest nibbles of the fixed point numbers. viewangle is set to
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playerangle.
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SetupFrame is then called:
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View buffer is cleared
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wallz array is set to MAXZ + 1 ((6 shl 22) + 1)
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mapcache_height contents are set to 0xF0
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numspans is set to 0
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frameon is incremented(?)
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viewtilex and viewtiley are set to the respective x and y values shifted
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by 22(?)
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viewfineangle is set by shifting viewangle by 5
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Initializes backvertex;
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