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vgi: more work on triangles and too-big points
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Vince Weaver
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144
graphics/hgr/vgi/README.VGI
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144
graphics/hgr/vgi/README.VGI
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@ -0,0 +1,144 @@
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VGI -- VMW Retro Vector Graphics Interface
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This was designed mostly as a proof-of-concept to drawing some Myst
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scenes. Might not work well for general graphics.
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The Apple II Hi-res screen is 280x192 and 6 colors with lots of limitations
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that are a bit complex to get into here. Some of the limitations in the
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interface here are working around Apple II issues.
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Apple II Hi-res Colors:
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~~~~~~~~~~~~~~~~~~~~~~~
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0 = black (for purple/green)
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1 = green
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2 = purple
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3 = white (for purple/green)
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4 = black (for blue/orange)
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5 = orange
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6 = blue
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7 = white (for blue/orange)
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Note Apple II uses NTSC artifact colors, so weird things happens when
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you try to put colors next to each other:
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+ Colors need to be two pixels wide, if you draw single width
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they may not appear depending on even/odd column
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+ White lines drawn single width will be colored instead
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+ Two colors of same group next to each other will have white or black
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border between
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+ Two colors of different group next to each other will have odd effects
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as can only change group every 3.5 pixels.
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The VGI Commands
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~~~~~~~~~~~~~~~~
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===================
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VGI Clearscreen (0)
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CLS color
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clears screen using ROM routine using color
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=================
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VGI Rectangle (1)
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RECT color1 color2 x1 y1 x2 y2
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draw filled rectangle from (x1,y1) to (x2,y2)
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color1 and color2 are drawn as alternating colors (horizontal stripes)
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x1 must be < 255. relative drawing is used so x2 can go to
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the edge of the screen (279)
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==============
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VGI Circle (2)
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CIRC color cx cy r
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Draw a circle of color with center (cx,cy) and radius r
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Circles with radius 0 will give an interesting non-circle effect.
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Bresenham circles are drawn and so certain sizes don't look the
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best. Also if the radius is too big things might break
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as the 8-bit unsigned int oveflows
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=====================
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VGI Filled Circle (3)
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FCIRC color cx cy r
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Draw a filled circle of color at location (cx,cy) with radius r
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=============
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VGI Point (4)
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POINT color x y
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Draws a point of color at (x,y)
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Note, X can be up to 279 here (the color is overloaded behind
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the scenes to support this)
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The last point you draw is the starting point for LINETO
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==============
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VGI Lineto (5)
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LINETO x y
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Draws a line to (x,y). The starting point and color come from
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the last POINT command.
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Note X cannot be > 255 so it can be trouble drawing at the right
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edge of the screen. POINT can go up to 279, so you might be able
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to get what you want by drawing from right to left
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==========================
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VGI Dithered Rectangle (6)
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DRECT c1 c2 x1 y1 x2 y2
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Draws a rectangle, but this time the two colors are raw bitmaps
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for the output colors, not one of the Apple II colors. This lets
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you do fancier dithered color patterns, but it's really hard
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getting dither patterns that look nice.
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=========================
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VGI Vertical Triangle (7)
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VTRI color vx vy xl xr yb
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Draw a flat bottom filled triangle of color.
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The top vertex is at (vx,vy)
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The bottom goes from (xl,yb) to (xr,yb)
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If your triangle is too tall you might get moire effects.
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This was much simpler than a proper filled triangle routine.
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===========================
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VGI Horizontal Triangle (8)
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HTRI color vx vy yt yb xr
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Draw a flat-sided filled triangle of color.
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The side vertex is at (vx,vy)
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The opposite side goes from (xr,yt) to (xr,yb)
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============
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VGI End (15)
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END
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this tells the drawing routine that we are done
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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@ -111,6 +111,10 @@ int main(int argc, char **argv) {
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&color1,
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&x1,&y1);
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printf(".byte $%02X,",(type<<4)|4);
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if (x1>255) {
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x1=x1&0xff;
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color1|=128;
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}
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printf("$%02X,",color1);
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printf("$%02X,",x1);
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printf("$%02X\n",y1);
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@ -2,25 +2,72 @@
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CLS 255 ; white background
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RECT 1 6 0 122 140 191 ; ocean left
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RECT 1 6 140 122 279 191 ; ocean right
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; rock
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RECT 1 5 239 171 279 191 ; green/orange rock
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VTRI 4 228 162 226 245 171 ; black edge
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VTRI 4 228 162 224 244 185 ; black edge
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VTRI 4 232 191 224 244 184 ; upside down
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VTRI 4 255 165 245 255 171 ; black right edge
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VTRI 4 255 178 245 255 171 ; black right edge
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RECT 4 4 255 170 279 178 ; rock shade
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RECT 4 4 255 163 270 178 ; rock shade
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; base
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DRECT 0x8 0x22 86 124 193 191 ; green brick dock
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FCIRC 7 99 121 4 ; left platform
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FCIRC 7 180 121 4 ; right platform
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RECT 7 7 99 119 175 125 ; platform
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RECT 7 7 99 119 175 127 ; platform
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RECT 0 0 102 128 116 191 ; left shade
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RECT 0 0 156 126 169 191 ; center shade
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RECT 0 0 179 126 194 191 ; right shade
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RECT 7 7 89 137 93 146 ; left light
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RECT 7 7 186 139 190 147 ; right light
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RECT 3 3 89 137 93 146 ; left light
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RECT 3 3 186 139 190 147 ; right light
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; walkway
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VTRI 7 129 129 109 129 191 ; left path
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RECT 7 7 129 129 151 191 ; center path
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VTRI 7 151 129 151 170 191 ; right path
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; wire
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VTRI 1 128 129 101 109 191 ; left path green
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VTRI 3 129 129 109 129 191 ; left path white
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RECT 3 3 129 129 151 191 ; center path
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VTRI 1 153 129 170 179 191 ; right path green
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VTRI 3 152 129 152 170 191 ; right path white
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POINT 0 152 129 ; right gap
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LINETO 170 191 ; right gap
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POINT 0 129 129 ; left gap
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LINETO 109 191 ; left gap
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; left railing
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POINT 0 127 115 ; far left pole
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LINETO 128 133
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POINT 3 127 115 ; far left rope
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LINETO 122 129
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POINT 2 123 126 ; center left pole
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LINETO 123 147
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POINT 3 120 128 ; center left rope
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LINETO 116 144
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LINETO 109 154
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LINETO 99 158
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RECT 2 2 97 164 100 191 ; near pole
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FCIRC 2 98 161 4 ; near pole circle
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; right railing
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POINT 0 153 117 ; far right pole
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LINETO 152 132
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POINT 3 153 118 ; far right rope
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LINETO 157 129
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POINT 2 158 126 ; center right pole
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LINETO 157 141
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POINT 3 158 127 ; center right rope
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LINETO 162 142
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LINETO 168 154
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LINETO 178 160
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RECT 2 2 177 164 181 191 ; near pole
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FCIRC 2 179 161 4 ; near pole circle
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; wire pole
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RECT 6 6 174 88 179 126 ; pole
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RECT 6 6 174 73 179 80 ; insulator
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POINT 6 177 90 ; thinner pole
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LINETO 177 74 ; to top
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LINETO 237 64 ; to top
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;LINETO 279 53 ; to top
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LINETO 255 60 ; to top
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; power wire
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POINT 6 279 54 ; from off screen
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LINETO 238 65
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LINETO 177 74
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LINETO 170 82
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LINETO 173 85
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LINETO 189 88
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LINETO 209 86
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END
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@ -4,16 +4,22 @@
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; VGI point
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;========================
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VGI_PCOLOR = P0
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VGI_PCOLOR = P0 ; if high bit set, then PX=PX+256
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VGI_PX = P1
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VGI_PY = P2
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vgi_point:
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ldx VGI_PCOLOR
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ldy #0
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lda VGI_PCOLOR
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bpl vgi_point_color
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iny
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vgi_point_color:
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and #$7f
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tax
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lda COLORTBL,X
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sta HGR_COLOR
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ldy #0
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ldx VGI_PX
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lda VGI_PY
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@ -1,5 +1,6 @@
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; VGI Triangles
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;========================
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; VGI vertical triangle
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;========================
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@ -7,8 +8,9 @@
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VGI_TCOLOR = P0
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VGI_VX = P1
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VGI_VY = P2
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VGI_TX1 = P3
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VGI_TX2 = P4
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VGI_TXL = P3
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VGI_TXR = P4
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VGI_TYB = P5
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vgi_vertical_triangle:
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@ -16,6 +18,7 @@ vgi_vertical_triangle:
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lda COLORTBL,X
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sta HGR_COLOR
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vtri_loop:
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ldy #0
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ldx VGI_VX
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lda VGI_VY
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@ -23,15 +26,18 @@ vgi_vertical_triangle:
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jsr HPLOT0 ; plot at (Y,X), (A)
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; ldx #0
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; ldy VGI_LY
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; lda VGI_LX
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ldx #0
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ldy VGI_TYB
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lda VGI_TXL
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; jsr HGLIN ; line to (X,A),(Y)
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; jmp vgi_loop
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jsr HGLIN ; line to (X,A),(Y)
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inc VGI_TXL
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lda VGI_TXL
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cmp VGI_TXR
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bcc vtri_loop
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done_vtri:
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jmp vgi_loop
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