=> R0 = pointer to TMmemoryblock
R1 = pointer to TMviewblock
R2 = pointer to TMcolourblock
R3 = screen bank to use (1 or 2; 1 for default)
R4 = rendering mode
Gemini enables you to have a full double buffering for smooth animation. Just redraw the screen with R3 set to 1 or 2 alternatively. See Gemini_EndBuffering.
Gemini_Render mode
Bit Meaning if set Meaning if not set
0 Colour [grey-shade]
1 Wireframe
2 Flat shading
3 Gouraud shading
4 Phong shading
5 Transparency enabled (not activated yet) [always opaque]
6 Texture mapping enabled
7 Chrome mapping enabled
8 Bump mapping enabled
9-11 reserved, must be zero
12 draw primitives [don't draw them]
13 reserved, must be zero
14 perspective view [axonometric view]
15 normal navigation mode [VR mode: objects behind observer aren't drawn]
16 visualize axes [don't]
17 recalculate active plane while rotating [don't]
18 remove objects with normals against the current view vector [draw all]
19 test Escape key to stop redraw [don't]
20 fog activated [fog disabled]
21 reserved, must be zero
22 recalculate light reflections if you aren't in Phong mode [don't]
23 clear the workarea with the current background colour [draw just objects]
24 draw bezier-curves/surfaces visual-hull lines [don't]
25 draw polygons' vertices [don't]
26 draw control points [don't]
27 enable lens-flares [don't]
28-31 reserved, must be zero
Please note: bits 1-4 are mutually exclusive; you should set just one of these.
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