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minjaesong
2022-01-02 23:12:41 +09:00
parent 10795aeae3
commit a84bdddd66
5 changed files with 115 additions and 6 deletions
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30
assets/disk0/tvdos/gl.js
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@@ -35,13 +35,13 @@ GL.SpriteSheet = function(tilew, tileh, tex) {
}
this.getOffX = function(x) { // THIS, or: GL.SpriteSheet.prototype.getOffX
var tx = this.tileWidth * x;
var tx = this.tileWidth * (x|0);
if (tx + this.tileWidth > this.texture.width) throw "Sprite x-offset of "+tx+" is greater than sprite width "+this.texture.width;
return tx;
};
this.getOffY = function(y) {
var ty = this.tileHeight * y;
var ty = this.tileHeight * (y|0);
if (ty + this.tileHeight > this.texture.height) throw "Sprite y-offset of "+ty+" is greater than sprite height "+this.texture.height;
return ty;
};
@@ -106,24 +106,42 @@ GL.drawTexImage = function(texture, x, y, fgcol, bgcol) {
GL.drawTexImageOver = function(texture, x, y, fgcol) {
GL.drawTexPatternOver(texture, x, y, texture.width, texture.height, fgcol);
};
GL.drawSprite = function(sheet, xi, yi, x, y) {
/*
* @param xi x-index in the spritesheet, ZERO-BASED INDEX
* @param yi y-index in the spritesheet, ZERO-BASED INDEX
* @param x x-position on the framebuffer where the sprite will be drawn
* @param y y-position on the framebuffer where the sprite will be drawn
* @param overrideFG if the value is set and the current pixel of the sheet is not 255, plots this colour instead
* @param overrideBG if the value is set and the current pixel of the sheet is 255, plots this colour instead
*/
GL.drawSprite = function(sheet, xi, yi, x, y, overrideFG, overrideBG) {
var offx = sheet.getOffX(xi);
var offy = sheet.getOffY(yi);
for (var ty = 0; ty < sheet.tileHeight; ty++) {
for (var tx = 0; tx < sheet.tileWidth; tx++) {
var c = sheet.texture.texData[(ty + offy) * sheet.texture.width + (tx + offx)];
graphics.plotPixel(x + tx, y + ty, c);
if ((c & 255) == 255)
graphics.plotPixel(x + tx, (y + ty)|0, (overrideBG !== undefined) ? overrideBG : c);
else
graphics.plotPixel(x + tx, (y + ty)|0, (overrideFG !== undefined) ? overrideFG : c);
}
}
};
GL.drawSpriteOver = function(sheet, xi, yi, x, y) {
/*
* @param xi x-index in the spritesheet, ZERO-BASED INDEX
* @param yi y-index in the spritesheet, ZERO-BASED INDEX
* @param x x-position on the framebuffer where the sprite will be drawn
* @param y y-position on the framebuffer where the sprite will be drawn
* @param overrideFG if the value is set and the current pixel of the sheet is not 255, plots this colour instead
*/
GL.drawSpriteOver = function(sheet, xi, yi, x, y, overrideFG) {
var offx = sheet.getOffX(xi);
var offy = sheet.getOffY(yi);
for (var ty = 0; ty < sheet.tileHeight; ty++) {
for (var tx = 0; tx < sheet.tileWidth; tx++) {
var c = sheet.texture.texData[(ty + offy) * sheet.texture.width + (tx + offx)];
if ((c & 255) != 255) {
graphics.plotPixel(x + tx, y + ty, c);
graphics.plotPixel(x + tx, (y + ty)|0, overrideFG || c);
}
}
}