diff options
Diffstat (limited to 'src/render.zig')
| -rw-r--r-- | src/render.zig | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/src/render.zig b/src/render.zig index 4753805..af662c0 100644 --- a/src/render.zig +++ b/src/render.zig @@ -318,6 +318,7 @@ pub fn Renderer(PlaneWidth: f32, PlaneHeight: f32) type { } var previous_layer_height: f32 = 0; + var previous_highest_drawn = highest_drawn; for (cell.lower_layers.constSlice()) |layer| { if (hitDistLocalCoords(ray0_x, ray0_y, ray1_x, ray1_y, layer.vertices.constSlice())) |hit| { // TODO: Correct for fisheye? @@ -348,7 +349,7 @@ pub fn Renderer(PlaneWidth: f32, PlaneHeight: f32) type { // if we're above the layer that set the // highest_drawn values, we can draw down // into it (for walls over floors) - const constrained_bottom = std.math.max(if (highest_drawn_same_square) 0 else highest_drawn, top_of_floor - proj_height); + const constrained_bottom = std.math.max(if (highest_drawn_same_square) previous_highest_drawn else highest_drawn, top_of_floor - proj_height); const stop_top = std.math.max(0, PlaneHeight - constrained_bottom - 1); const stop = @floatToInt(usize, PlaneWidth * stop_top) + col; const pix_y = @floatToInt(usize, std.math.ceil(std.math.max(PlaneHeight - constrained_top - 1, 0))); @@ -364,7 +365,7 @@ pub fn Renderer(PlaneWidth: f32, PlaneHeight: f32) type { pixels[pix_index] = walls_image.getPixel(.{ .x = t_lower_off + texcol, .y = ty }); self.z_buffer[pix_index] = adj_distance; } - highest_drawn = constrained_top; + highest_drawn = std.math.floor(constrained_top); } // do we potentially draw horizontal surfaces? @@ -374,7 +375,7 @@ pub fn Renderer(PlaneWidth: f32, PlaneHeight: f32) type { // than us the back edge is lower than the front one so // this check will fail as we just drew it (or higher // than it). If the wall is shorter then the back edge - // is at most the horizon. Similarly so for next_bottom + // is at most the horizon. const next_top = PlaneHeight / 2 + PlaneDist * (layer.height - pheight) / next_distance; if (next_top > highest_drawn) { highest_drawn_same_square = true; @@ -385,7 +386,7 @@ pub fn Renderer(PlaneWidth: f32, PlaneHeight: f32) type { const thresh = highest_drawn; const itop = @floatToInt(usize, std.math.max(top, 0)); - const ptop = @floatToInt(usize, PlaneHeight) - itop - 1; + const ptop = @floatToInt(usize, PlaneHeight) - itop; var pix_index = ptop * @floatToInt(usize, PlaneWidth) + col; while (top > thresh) : ({ top -= 1; @@ -393,16 +394,14 @@ pub fn Renderer(PlaneWidth: f32, PlaneHeight: f32) type { }) { const row_dist = (pheight - layer.height) * PlaneDist / (PlaneHeight / 2 - top); // draw the correct pixel - const sx = ppos_x + row_dist * cosra; - const sy = ppos_y + row_dist * sinra; - const rx = std.math.modf(sx).fpart; - const ry = std.math.modf(sy).fpart; - if (@floatToInt(i32, sx) == ipos_x and @floatToInt(i32, sy) == ipos_y and pointInPoly(rx, ry, layer.vertices.constSlice())) { + const rx = std.math.modf(ppos_x + row_dist * cosra).fpart; + const ry = std.math.modf(ppos_y + row_dist * sinra).fpart; + if (pointInPoly(rx, ry, layer.vertices.constSlice())) { const px = @floatToInt(c_uint, constants.TextureDim * rx); const py = @floatToInt(c_uint, constants.TextureDim * ry); pixels[pix_index] = surfaces_image.getPixel(.{ .x = toff + px, .y = py }); if (top > highest_drawn) { - highest_drawn = top; + highest_drawn = std.math.floor(top); } if (layer.height > 0) self.z_buffer[pix_index] = row_dist; } |