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Blend table
From FenixWiki
Definition
A blend table contains the blend data needed to perform the blend between the object (source) and where the object is drawn (destination). The table contains those two sections: source and destination; these section are added together when blending, which cannot be altered, but the sections themselves can be influenced by the blend operations available.
One can even make homemade blending operations, if one has enough knowledge of the subject, as blendop_new() returns a pointer to the created blend table. This table is constructed like this:
bytes-start | - bytes-end | - total | - purpose |
0 | - 65535 | - 65536 | - Source section |
65536 | - 131071 | - 65536 | - Destination section |
Each pixel of a section represents a colour. When a blend table is initialized, it's done like this:
for (i = 0 ; i < 65536 ; i++) source[i] = i ; for (i = 0 ; i < 65536 ; i++) destination[i] = 0 ;
So:
- For the source section the following applies: The nth index has value n.
- For the destination section the following applies: The nth index has value 0.
Example
Global int bo_tintred; int bo_tintredAndTranslucent; int bo_intense; int bo_destintense; int bo_grayscale; int bo_destgrayscale; int map; Begin // Set mode to 320x200x16 set_mode(320,200,16); // Init tables bo_tintred = blendop_new(); bo_tintredAndTranslucent = blendop_new(); bo_intense = blendop_new(); bo_grayscale = blendop_new(); bo_destintense = blendop_new(); bo_destgrayscale = blendop_new(); // Red tint blendop_tint(bo_tintred,0.5,100,0,0); // Red tint with translucency blendop_tint(bo_tintredAndTranslucent,0.5,250,0,0); blendop_translucency(bo_tintredAndTranslucent,0.5); // Intense blendop_intensity(bo_intense,1.5); // Display the destination intense blendop_intensity(bo_destintense,1.5); blendop_swap(bo_destintense); // Grayscale blendop_grayscale(bo_grayscale,1); // Display the destination in grayscale blendop_grayscale(bo_destgrayscale,3); blendop_swap(bo_destgrayscale); // Make a new map map = some_map(80,80,16); // Make the background rgb(50,150,150) map_clear(0,background,rgb(50,150,150)); // Show the four different blend operations a( 50, 50,map,0,"original"); a(150, 50,map,bo_tintred,"red"); a(250, 50,map,bo_tintredAndTranslucent,"red+transparent"); a( 50,150,map,bo_intense,"intense"); a(150,150,map,bo_destintense,"dest instense"); a(250,150,map,bo_grayscale,"grayscale"); // Give this process one too blendop_assign(0,map,bo_destgrayscale); graph = map; Repeat x = mouse.x; y = mouse.y; if(mouse.left) z = -1; else z = 1; end frame; Until(key(_ESC)) OnExit let_me_alone(); End /** * Description * Create a new process at the given coordinates. * Its graph will be cloned from the specified one and the * specified blendtable will be assigned. * The specified text will be put on the background below the graph. * * Parameters * int x,y - Coordinates the process will be at. * int graph - The graph to be cloned (file=0). * int blendtable - The blendtable to assign to the graph. * int string text - The text to put on the map. * * Returns * ProcessID */ Process a(int x,int y,int graph, int blendtable, string text) Begin // Clone the map graph = map_clone(0,graph); // Assign the blend table blendop_assign(0,graph,blendtable); // Set z=0 z = 0; // Create text and put it on the background set_text_color(rgb(100,200,250)); height=write_in_map(0,text,1); put(0,height,x,y+1+graphic_info(0,graph,G_HEIGHT)/2); unload_map(0,height); // Loop Loop frame; End End /** * Description * Creates a map with the four corners coloured differently. * * Parameters * int x,y,z - The width, height and depth of the map to be created. * * Returns * The graphID of the created map */ Function int some_map(int x, int y, int z) Begin height = new_map(x,y,z); map_clear(0,height,rgb(50,100,150)); drawing_map(0,height); drawing_color(rgb(200,50,100)); draw_box(0,0,x/2,y/2); drawing_color(rgb(0,250,100)); draw_box(x/2,0,x,y/2); drawing_color(rgb(150,50,250)); draw_box(x/2,y/2,x,y); return height; End
Used in example: set_mode(), blendop_new(), blendop_tint(), blendop_translucency(), blendop_intensity(), blendop_swap(), blendop_grayscale(), map_clear(), blendop_assign(), key(), let_me_alone(), map_clone(), set_text_color(), write_in_map(), put(), unload_map(), new_map(), drawing_map(), drawing_color(), draw_box(), mouse
This will result in something like: